JP2001285891A - Signal converter - Google Patents

Abstract

(57) [Problem] To provide a video and audio signal of an analog format without a necessity of having a dedicated circuit such as a plurality of types of encoders and decoders and increasing a circuit size in an audio / video device. To provide a signal conversion device capable of easily converting a signal format into and out of a stream. SOLUTION: Based on a control signal and copyright information, a main controller 16 converts each component into:
Copyright information is added to an analog audio / video signal or an MPEG transport or DV frame unit stream, an analog audio / video signal is converted into each stream and output as a standard bus stream,
-Converts and records the standard bus stream to the VHS system 21 or the DVC recording / reproducing unit 19 based on the standard bus stream, converts each stream recorded directly into an analog audio / video signal, and outputs the analog audio / video signal. Control to convert the format.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal conversion apparatus for mutually converting the format of an analog audio / video signal and various digital streams.

[0002]

2. Description of the Related Art In recent years, technical development of hardware and software in electronic technology has progressed, and digital processing technology for audio and video signals has advanced accordingly, and high-definition software has been abundantly available on the market. Audio / video equipment (AV equipment) such as digital TV receivers, video tape recorders and video cameras
However, they are being used in an increasingly wide range of applications.

[0003] Therefore, a signal format for the video signal and the audio signal is converted between the above-mentioned digital audio-video equipment and the same analog audio-video equipment used conventionally. A signal converter is needed.

Conventionally, as a signal format converter for such video signals and audio signals, analog video signals and audio signals are converted into, for example, a DV frame unit stream, and further converted into a standard bus stream format such as an IEEE 1394 bus stream. A signal converter configured to output a signal to the outside or, conversely, to input a signal in a standard bus stream format and convert it to, for example, a DV frame unit stream, and further to an analog video signal and an audio signal, It has already been proposed, implemented and used.

[0005] The signal converter configured as described above has
The signal format is mutually converted between the analog format video signal and audio signal and the DV frame unit stream according to the format of each signal.

[0006]

However, in the conventional signal converter as described above, as described above, only one type of stream is supported, and only one type of video signal and audio signal in analog format is used. Format conversion of signals to and from this stream.

On the other hand, various stream signals can be carried on a recent standard bus. For example, an MPEG transport stream and various other stream signals can be transmitted in addition to a DV frame unit stream.

However, in each audio-visual equipment connected to the above-mentioned conventional signal converter using such a standard bus, a signal is sent to each of the various streams in order to correspond to the above-mentioned plural kinds of streams. In order to convert the format, it is necessary to have dedicated circuits such as a plurality of types of encoders and decoders corresponding to the various streams, and there has been a problem that the circuit scale is greatly increased.

The present invention solves the above-mentioned conventional problems, and eliminates the need for audio / video equipment to have dedicated circuits such as a plurality of types of encoders and decoders for handling various streams, and reduces the circuit scale. Provided is a signal converter capable of easily converting a signal format between an analog video signal and an audio signal and a plurality of types of streams without increasing the number of streams.

[0010]

In order to solve the above-mentioned problems, a signal conversion device according to the present invention comprises a main controller which receives a control signal output for command-controlling each component from a copyright detection means. Based on the copyright information, each component can add copyright information to an analog format video signal and audio signal, an MPEG transport stream or a DV frame unit stream, A signal and an audio signal are converted into an MPEG transport stream or a DV frame unit stream and output as a standard bus stream, or converted and recorded based on the standard bus stream or directly recorded in an MPEG transport stream or DV frame unit. Stream streams in analog format Or it outputs the converted signal and the audio signal, so that to convert the format of the stream signal to and from an MPEG transport stream and DV frame unit streams, and controlling.

As described above, in the audio-visual equipment, the necessity of having dedicated circuits such as a plurality of types of encoders and decoders for handling various streams is eliminated, and the video signal and the analog-format video signal are not increased without increasing the circuit scale. A signal format can be easily converted between an audio signal and a plurality of types of streams.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A signal converter according to a first aspect of the present invention includes an A / D converter for converting a video signal and an audio signal from an analog format to a digital format, and the A / D converter.
Copyright detecting means for detecting copyright information from a digital video signal obtained from a D converter, and converting the digital video signal from the A / D converter into a luminance signal Y and color difference signals Cr and Cb as signal components thereof. A decoder converter that separates and converts the signals into a first reference sampled YC signal, and sets each sampling frequency for the Y, Cr, and Cb during the separation; The Y, Cr, and Cb are MPEG-converted together with the digital audio signal from the A / D converter to generate an MPEG transport stream.
A PEG encoder and M from the MPEG encoder
A first digital bus input / output interface for mutually converting the format of a stream signal between a PEG transport stream and a standard bus stream for input / output to / from the outside; An MPEG decoder for decoding the MPEG transport stream whose stream signal format has been converted by a digital bus input / output interface to obtain the first reference sampling YC signal and a digital audio signal of the same format; and the decoder / converter A first reference sampling YC signal from the MPEG decoder, a first selector for selecting a digital audio signal accompanying the first reference sampling YC signal, and a first reference sampling YC signal from the first selector. DV signal A first converter for converting to a second reference sampling YC signal in DV format suitable for loading, a second reference sampling YC signal from the first converter, and a digital audio signal from the first selector In addition to the above, a sub-code including a time code and the like which is compressed in the DV format is added, and DV-encoded into a DV frame unit stream, and the DV-compressed video signal and audio signal are subjected to the DV frame unit stream. A DV encoder / decoder for decoding the second reference sampled YC signal and the digital audio signal and detecting the sub-code; a DV frame unit stream in the DV encoder / decoder and a standard bus stream for input / output to / from the outside; Between
A second digital bus input / output interface for mutually converting the format of the stream signal;
A second converter for converting the second reference sampled YC signal from the decoder into the first reference sampled YC signal; and the second converter or the MPE.
G decoder or the first from the decoder converter
And a third selector for selecting a digital audio signal accompanying the first reference sampled YC signal from the second converter or the MPEG decoder or the decoder / converter. The character information arbitrarily generated and the copyright information from the copyright detecting means are inserted into the first reference sampled YC signal from the second selector as needed, and are separated and obtained. An encoder for encoding a digital subcarrier chrominance signal based on the chrominance signal composed of Cr and Cb; a Y in a first reference sampling YC signal from the encoder; a digital subcarrier chrominance signal from the encoder; About the digital audio signal from the selector of
A D / A converter for converting from a digital format to an analog format, and a main controller for outputting a command for controlling the operation of each element, wherein the main controller outputs the command and performs the copyright detection. Receiving the copyright information from the means, the video signal and the audio signal in the analog format or the MPEG
Adding the copyright information to the transport stream or the DV frame unit stream, converting the analog format video signal and audio signal to the MPEG transport stream or the DV frame unit stream, and outputting the converted signal as a standard bus stream; MPEG
Mutually converting the format of the stream signal between the transport stream and the DV frame unit stream,
The standard bus stream of the MPEG transport stream or the DV frame unit stream is converted to the analog format video signal and audio signal.

[0013] The signal conversion device according to the second aspect is an A / D converter.
A first A / D converter for converting an analog audio signal into a digital audio signal; a digital composite video signal or digital S as an analog video signal as an analog composite video signal or analog S video luminance signal as a digital video signal; Second to convert to video luminance signal
And A / D conversion means for converting an analog S video sub-carrier color signal as the analog video signal into a digital sub-carrier color signal as the digital video signal, and a decoder / converter When the analog video signal for the second A / D converter is the analog composite video signal, the digital composite video signal is used as the digital video signal from the second A / D converter, and the digital luminance signal Y Digital YC separating means for separating the analog composite video signal or analog S signal into an analog video signal for the second A / D conversion means.
According to the input selection of the video luminance signal, the digital YC
Color difference decoding means for decoding the digital subcarrier color signal C separated by the separation means or the digital subcarrier color signal C from the third A / D conversion means into digital color difference signals Cr and Cb; A time axis fluctuation removing means for removing the time axis fluctuations of Cr and Cb and outputting as a first reference sampled YC signal;
A first audio delay adjustment for adjusting the amount of delay between the / D conversion means and the audio MPEG conversion means so as to match the amount of delay until the digital video signal is processed and input to the video MPEG conversion means. Standard signal converting means for converting an MPEG encoder from the first reference sampling YC signal from the time axis fluctuation removing means into a standardized signal which is a standard signal format suitable for MPEG encoding. Video MPEG conversion means for MPEG-compressing the standardized signal from the standard signal conversion means to obtain a video elementary stream; and MPEG-compressing the digital audio signal from the first audio delay adjustment means for MPEG. Audio MPEG conversion means for obtaining a stream, and a video elementary stream from the video MPEG conversion means. Means for packetizing video, audio packetizing means for packetizing an audio elementary stream from the audio MPEG conversion means, header and time stamp, etc. for each packetization of the video and audio elementary streams. MPEG encoding control means for adding an additional signal of the above, and packetized elementary streams from the video packetizing means and the audio packetizing means, and
MPEGTS synthesizing means for obtaining a PEG transport stream.
MP for separating a transport stream into the video elementary stream and the audio elementary stream
EG system decoding means, video MPEG decoding means for expanding the video elementary stream from the MPEG system decoding means and converting it to the standardized signal, and audio audio elementary stream from the MPEG system decoding means for expanding the digital Audio MPEG decoding means for converting to an audio signal;
Video delay adjusting means for eliminating a difference in delay amount from an audio signal generated at the time of conversion to a standardized signal by the G decoding means, and a video signal generated at the time of conversion to a digital audio signal by the audio MPEG decoding means A second audio delay adjusting means for eliminating a difference in delay amount with the MPEG,
Controlling the separation of the video and audio elementary streams by the system decoding means;
An MPEG decode control means for detecting a time stamp from the transport stream and controlling a difference in signal delay amount between the video delay adjusting means and the second audio delay adjusting means based on the time stamp; The standardized signal from the adjusting means is converted into the first reference sampled YC signal by a conversion process reverse to that of the standard signal converting means. A first video selector for selecting a first reference sampling YC signal from the axis fluctuation removing means or the inverse standard signal converting means;
And a first audio selector for selecting a digital audio signal from the first audio delay adjusting means or the second audio delay adjusting means, wherein the DV encoder / decoder is a second reference from the first converter. Sampling YC signal
A video DV compression means for compressing a frame by a DV compression method different from the MPEG compression processing to obtain a frame-based video DV compression signal; An audio DV compression unit that obtains a frame unit audio DV compression signal by compressing within a predetermined time range of a unit; a frame unit video DV compression signal from the video DV compression unit and a frame unit from the audio DV compression unit An audio DV compression signal and a subcode signal including a time code and the like are synthesized by time sharing according to a predetermined method, and DV
DV stream synthesizing means for generating a frame unit stream, AVS separating means for separating the DV frame unit stream into the frame unit video DV compressed signal, frame unit audio DV compressed signal and the subcode signal, and the AVS separating means A DV audio decompression unit for decompressing the frame-unit audio DV compressed signal from the PCM and obtaining the digital audio signal by PCM processing;
And a sub-code generating / reading means for generating and reading the sub-code.
Signal insertion means for inserting a character signal and various kinds of information such as copyright information into the first reference sampling YC signal selected by the selector, and generating the character signal to be inserted into the first reference sampling YC signal. A character generator, a character controller for controlling the character generator to specify a character required for display, and a first reference sampling YC signal into which various information is inserted and added by the signal inserter. And a color signal encoding means for encoding Cr and Cb to convert the digital subcarrier color signal C into digital color signals. The D / A converter converts the digital audio signal from the third selector into an analog analog audio signal. Various information is inserted and added by the first D / A conversion means for conversion and the signal insertion means. The second of the Y of the first reference sampling YC signal into an analog luminance signal in analog form and
D / A conversion means, third D / A conversion means for converting the digital subcarrier chrominance signal from the chrominance signal encoding means into an analog analog subcarrier chrominance signal, and the analog luminance signal and analog subcarrier Mixing means for mixing the color signals with the digital color difference signals Cr and Cb.
b, C of the first reference sampled YC signal
When each sampling frequency of r and Cb is the sampling frequency fy of Y, the sampling frequency fc (odd) of the odd lines of Cr and Cb is nl · m /
4 (nl = 2), and the sampling frequency fc (even) of the even lines of Cr and Cb is set to n2 · m / 4 (n2 =
0 or 2) as the sampling frequency f of the Y
y: sampling frequency fc (odd) of the odd lines of Cr and Cb: sampling frequency fc (even) of even lines of Cr and Cb = fy: fc (od)
d): fc (even) = m: n1 · m / 4: n2 · m
/ 4 = 4: nl: n2, and the first converter converts a first reference sampled YC signal from a first video selector in the first selector. To convert it to the second reference sampled YC signal. At the time of this conversion, the line sampling frequency of each of Y, Cr and Cb is set to 4: nl: n2 with respect to the second reference sampled YC signal. And the second converter converts the second reference sampled YC signal from the DV video decompression means in the DV encoder / decoder. And converts the signal into the first reference sampled YC signal, and controls the main controller as a video signal of a composite video signal or an S video luminance signal. A control signal for controlling selection switching, a control signal for generating the operation timing of the MPEG encode control means and the MPEG decode control means, and a first and second control signal. The copyright information from the copyright detecting means is added to the standard bus stream output from the digital bus input / output interface and various analog signals output from the analog signal output terminal, and the first, second, and third Supply of a control signal for switching control of the digital audio signal and the first reference sampling YC signal by the selector, and supply of a selection control signal for designation of character selection by the character control means, The subcode And a control signal for controlling generation and reading of a subcode including a time code or the like and transmission and reception of the subcode in the composition reading means, wherein the analog composite video signal and the analog luminance are provided as the analog audio signal and the analog video signal. An analog signal input terminal for inputting an analog S video signal consisting of a signal and an analog subcarrier chrominance signal; and the analog composite video signal, the analog luminance signal and the analog subcarrier chrominance signal as the analog audio signal and the analog video signal An analog signal output terminal for outputting an analog S video signal and the first digital bus input / output interface for inputting / outputting the standard bus stream to / from the first digital bus input / output interface. A first digital bus line input / output terminal for connection to the second digital bus input / output interface,
A second digital bus line input / output terminal for inputting / outputting the standard bus stream to / from the second digital bus input / output interface; and a main controller for executing various controls by the main controller. Operation input means for inputting an operation for instructing the execution.

According to a third aspect of the present invention, there is provided a signal conversion apparatus interposed between the DV encoder / decoder according to the first or second aspect and the second digital bus input / output interface, and configured to convert a DV frame unit stream. A second switch for bidirectionally switching input / output connection; and a DV stream recording / reproducing means connected to the second switch for recording / reproducing the DV frame unit stream. An amplifier for adding an error correction signal to the DV frame unit stream to amplify the DV frame unit stream, a magnetic tape running mechanism unit for recording the DV frame unit stream amplified by the amplifier on a magnetic tape, and running by the magnetic tape running mechanism unit The amplified DV frame unit stream through a rotating magnetic head A rotary head mechanism for recording and equalizing a DV frame unit stream reproduced from the rotary head mechanism unit, and amplifying the DV frame unit stream after performing error correction of the signal based on the error correction signal. And a mechanism system control means for controlling and controlling each section, and the second switch is used to switch the DV frame unit stream in the DV encoder / decoder or the second digital bus input / output interface. Then, it is configured to input / output to / from the DV stream recording / reproducing means.

According to a fourth aspect of the present invention, there is provided a signal conversion device interposed between an MPEG encoder and an MPEG decoder according to the first or second or third aspect and a first digital bus input / output interface. A first switch for bidirectionally switching the input / output connection of the MPEG transport stream; and an MPEG stream recording / reproducing means connected to the first switch for recording / reproducing the MPEG transport stream. Switch from the MPEG encoder or the first digital bus I / O interface to the M
By switching the PEG transport stream, the MP
The MP recorded on the EG stream recording / reproducing means and reproduced from the MPEG stream recording / reproducing means.
Switching the EG transport stream to the MPE
It is configured to supply to the G decoder or the first digital bus input / output interface.

According to a fifth aspect of the present invention, there is provided the signal conversion apparatus according to any one of the first to fourth aspects, wherein Y, Cr, and Cb are provided.
The coefficients n1 and n2 of 4: n1: n2 related to each line sampling frequency are n1 = 2 and n2 = 2 when the video signal is in the NTSC system, and n1 = 2 and n when the video signal is in the PAL.
It is assumed that 2 = 0.

According to a sixth aspect of the present invention, there is provided the signal conversion device according to any one of the first to fourth aspects.
The coefficients k1 and k2 of 4: k1: k2 relating to each line sampling frequency are k1 = 1 and k2 = 1 when the video signal is in the NTSC system, and k1 = 2 and k when the video signal is in the PAL.
It is assumed that 2 = 0.

According to a seventh aspect of the present invention, there is provided a signal conversion device for connecting the first digital bus line input / output terminal and the second digital bus line input / output terminal according to any one of the second to sixth aspects. And one digital bus line input / output terminal.

[0019] According to these configurations, the main controller controls each component based on the control signal output for command-controlling each component and the copyright information received from the copyright detecting means. They add copyright information to analog video and audio signals or MPEG transport streams or DV frame unit streams, or convert analog video and audio signals to MPEG transport streams or DV frame unit streams. And then output as a standard bus stream, or convert and record the standard bus stream as an original, or convert directly recorded MPEG transport stream or DV frame unit stream into analog video and audio signals and output. Or MPE Another as or convert the format of the stream signal to and from the transport stream and DV frame unit streams, and controls.

Hereinafter, a signal conversion device according to an embodiment of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a block diagram showing an overall schematic configuration of a signal conversion device according to the present embodiment. 2 to 10 are detailed configuration diagrams of each block in the signal conversion device of FIG.

In FIG. 1, reference numeral 1 denotes an input signal A / D converter as an A / D converter for converting an analog video signal and an audio signal input from the outside into a digital format, and 2 denotes an input signal A / D converter. Copyright detecting means 3 for detecting copyright information from the digital video signal obtained from 1 converts the digital video signal from the input signal A / D converter 1 into a luminance signal Y and color difference signals Cr and Cb as signal components thereof. Separate and convert to a first reference sampled YC signal consisting of them,
During the separation into r and Cb, input signal decoder / converter 4 as a decoder / converter for setting respective sampling frequencies for Y, Cr and Cb, and Y and Cr from input signal decoder / converter 3 An audio / video MP as an MPEG encoder that converts Cb into an MPEG together with a digital audio signal from the input signal A / D converter 1 to generate an MPEG transport stream.
The EG encoder 5 and the MPEG transport stream 5 in the audio / video MPEG encoder 4 and a standard bus stream (for example, IEEE 1
394 bus stream), and a first digital bus input / output interface 6 for mutually converting the format of the stream signal, and a first digital bus input / output interface 5 converts the format from a standard bus stream input externally. MPEG transport stream
An audio / video MPEG decoder as an MPEG decoder for decoding to obtain the first reference sampling YC signal and a digital audio signal of the same format, 7 is an input signal decoder / converter 3 or an audio / video MPEG decoder 6
A first reference sampled YC signal from one of
A first selector 8 for switching and selecting a digital audio signal accompanying the DV signal is a DV adapted to DV encode the first reference sampling YC signal from the first selector 7.
First to convert to a second reference sampled YC signal of the form
The converter 9 adds a subcode including a time code and the like to the second reference sampled YC signal from the first converter 8 and the digital audio signal from the first selector 7 by compressing them into a DV format. , DV encoding into a DV frame unit stream, and decoding the DV compressed video signal and audio signal forming the DV frame unit stream into a second reference sampled YC signal and digital audio signal. DV encoder / decoder for detecting sub-code from unit stream, 10 is DV encoder / decoder 9
And a standard bus stream (for example, IEEE 139) input / output to / from an external device.
And a second digital bus input / output interface 11 for mutually converting the format of the stream signal between the first reference sampling Y and the first reference sampling YC from the DV encoder / decoder 9.
A second converter 12 for converting to a C signal selects a second converter 11 or any one of the first reference sampling YC signals from the audio / video MPEG decoder 6 or the input signal decoder / converter 3. The second video selector 13 as a selector selects one of the digital audio signals accompanying the first reference sampling YC signal from the second converter 11 or the audio / video MPEG decoder 6 or the input signal decoder / converter 3. A second audio selector 14 as a third selector performs arbitrarily generated character information and a copyright from the copyright detecting means 2 on the first reference sampled YC signal from the second video selector 12. Information is inserted as needed, and the C obtained by separating the first reference sampled YC signal. , Cb, an output signal encoder as an encoder that generates a digital sub-carrier color signal based on each of the color difference signals. Reference numeral 15 denotes a Y in the first reference sampling YC signal from the output signal encoder 14 and a signal from the output signal encoder 14. D / A for converting a digital subcarrier color signal and a digital audio signal from the second audio selector 13 from a digital format to an analog format
An output signal D / A converter as a converter, 16 is a main controller for outputting a control signal for commanding the operation of each of the above-mentioned components, and 17 is a main controller 16 for performing various command controls for each of the above-mentioned components. To execute, the main controller 16
An input operation panel as operation input means for performing an operation input for instructing execution of various command controls to the
A second switch 19 interposed between the V encoder / decoder 9 and the second digital bus input / output interface 10 for bidirectionally switching the input / output connection of a DV frame unit stream, and 19 is a second switch 18 Connected
A DV recording / reproducing unit as a DV stream recording / reproducing means for recording / reproducing a DV frame unit stream from the DV encoder / decoder 9 or the second digital bus input / output interface 10, and 20 is an audio / video MPEG encoder 4 and an audio / video MPEG decoder A first switch 21, which is interposed between the first digital bus input / output interface 5 and switches bidirectionally the input / output connection of the MPEG transport stream, is connected to the first switch 20, and the audio / video MPEG encoder 4
Alternatively, the first digital bus input / output interface 5
A D-VHS system (another example is an HDD system or a DVD system) is an example of an MPEG stream recording / reproducing means for recording / reproducing an MPEG transport stream from the Internet.

The first switch 20 is connected to the audio / video M
By switching the MPEG transport stream from the PEG encoder 4 or the first digital bus input / output interface 5, for example, while recording on the D-VHS system 21, switching the MPEG transport stream reproduced from the D-VHS system 21 ,
The audio / video MPEG decoder 6 or the first digital bus input / output interface 5 is configured to be supplied.

The second switch 18 is configured to switch a DV frame unit stream in the DV encoder / decoder 9 or the second digital bus input / output interface 10 to input / output to / from the DVC recording / reproducing unit 19. ing.

A11 is an analog signal input terminal for inputting an analog video signal including an analog S video signal composed of an analog luminance signal and an analog subcarrier chrominance signal and an analog composite video signal, and an analog audio signal; A22 is an analog video signal including an analog S video signal composed of an analog luminance signal and an analog subcarrier chrominance signal and an analog composite video signal;
An analog signal output terminal D11 for outputting an analog audio signal is connected to a first digital bus input / output interface 5 for inputting / outputting a standard bus stream to / from the first digital bus input / output interface 5. The first digital bus line input / output terminal of D22
Is a second digital bus line input / output terminal connected to the second digital bus input / output interface 10 for inputting / outputting a standard bus stream to / from the second digital bus input / output interface 10.

The main controller 16 outputs a control signal for instructing each of the above-mentioned components for the respective operations, and receives copyright information from the copyright detection means 2 by receiving the copyright information.
In each of the above components, the copyright information is added to the analog format video signal and audio signal, the MPEG transport stream or the DV frame unit stream, and the analog format video signal and audio signal are
An EG transport stream or a DV frame unit stream is converted and further output as a standard bus stream. An MPEG transport stream or a DV frame unit stream which is converted and recorded based on the standard bus stream or directly recorded is converted into an analog format. Each of the above-described components is controlled so as to be converted into a video signal and an audio signal and output, or to mutually convert the format of a stream signal between an MPEG transport stream and a DV frame unit stream.

In FIG. 2, reference numeral 1 denotes an input signal A shown in FIG.
A / D converter 101 is a first A / D converter for converting an analog audio signal into a digital audio signal, and 102 is an analog video switch 104 as an analog video signal.
The analog composite video signal or the analog S video luminance signal selected by the digital composite video signal or the digital S video signal as the digital video signal, respectively.
Second A / D conversion means for converting the image into a video luminance signal; 103
Reference numeral denotes third A / D conversion means for converting an analog S video subcarrier color signal as an analog video signal into a digital subcarrier color signal as a digital video signal.

In FIG. 3, reference numeral 3 denotes the input signal decoder / converter shown in FIG. 1, and 301 denotes the second A / D conversion means 1.
In the case where the analog video signal for O.02 is an analog composite video signal, the digital composite video signal as a digital video signal from the second A / D converter 102 is separated into a digital luminance signal Y and a digital subcarrier color signal C. The YC separation means 302 is a second A /
The digital subcarrier color signal C or the digital subcarrier color signal C from the digital YC separation means 301 selected by the digital subcarrier color signal switch means 306 corresponding to the input selection of the analog composite video signal or the analog S video luminance signal to the D conversion means 102. 3 from the digital sub-carrier color signal C from the A / D conversion means 103.
A color difference decoding (converter) means 303 for decoding into r and Cb, and a digital video switch means 3 corresponding to the input selection of an analog composite video signal or an analog S video luminance signal to the second A / D conversion means 102
05 or the digital luminance signal Y from the digital YC separation means 301 or the second A / D conversion means 10
2 for the digital S video luminance signal Y from the second and the digital color difference signals Cr and Cb from the color difference decoding means 302, the time axis fluctuation of which is removed as the first reference sampled YC signal after removing the time axis fluctuation. Removal means, 3
Numeral 04 adjusts the amount of delay between the first A / D converter 101 and the audio MPEG converter 403 so as to match the amount of delay from processing of the digital video signal to input to the video MPEG converter 402. The first audio delay adjusting means.

In FIG. 4, reference numeral 4 denotes the audio / video M shown in FIG.
PEG encoder 401 is time axis fluctuation removing means 303
From the first reference sampling YC signal to a standardized signal (for example, a signal of a format specified in the standard REC.656) which is a standard signal format suitable for MPEG encoding, 402 MPEG video compression means for MPEG-compressing the standardized signal from the standard signal conversion means 401 to obtain a video elementary stream, and 403 an audio elementary stream obtained by MPEG-compressing the digital audio signal from the first audio delay adjustment means 304 404 is a video MP
Video packetizing means for packetizing the video elementary stream from the EG conversion means 402.
Audio packetizing means for packetizing the audio elementary stream from the PEG conversion means 403, and 406, a video packetizing means 404 and an audio packetizing means 405.
MPEG encoding control means for adding an additional signal such as a header and a time stamp at the time of packetizing each of the video and audio elementary streams according to the above. 407 is each packetized element from the video packetizing means 404 and the audio packetizing means 405. MPEGTS combining means for combining the mental stream to obtain an MPEG transport stream.

In FIG. 5, reference numeral 6 denotes the audio / video M shown in FIG.
A PEG decoder 601 is an MPEG system decoding means for separating the MPEG transport stream into a video elementary stream and an audio elementary stream, and 602 is a video signal from the MPEG system decoding means 601 which is decompressed and converted into a standardized signal. Video MPEG decoding means, 603 is MPEG
Audio M for expanding the audio elementary stream from system decoding means 601 and converting it to a digital audio signal
The PEG decoding unit 604 eliminates the difference between the amount of delay that occurs when the video MPEG decoding unit 602 converts to a standardized signal and the amount of delay that occurs when the audio MPEG decoding unit 603 converts to a digital audio signal. Video delay adjusting means for adjusting the amount of delay with respect to the standardized signal from the video MPEG decoding means 602;
Reference numeral 605 denotes a delay amount generated when the audio MPEG decoding unit 603 converts the digital audio signal into a digital audio signal,
In order to eliminate the difference from the amount of delay that occurs when converting to a standardized signal by the PEG decoding unit 602, the audio MP
A second audio delay adjusting unit 606 for adjusting the delay amount for the digital audio signal from the EG decoding unit 603 controls the separation of the video and audio elementary streams by the MPEG system decoding unit 601 and also converts the MPEG transport stream from the MPEG transport stream to the MPEG. A time stamp for time management is detected through the system decoding means 601, and based on the time stamp, the video delay adjusting means 604 and the second audio delay adjusting means 6 are detected.
MPEG decoding control means 607 for controlling the difference adjustment of each signal delay amount in accordance with the standard signal conversion means 401, the delay signal being adjusted according to the delay amount on the audio signal side and output from the video delay adjustment means 604. This is an inverse standard signal conversion means for converting into a first reference sampling YC signal by a conversion process reverse to the above.

In FIG. 6, reference numeral 7 denotes the first selector shown in FIG. 1;
A first video selector 702 for selecting one of the signals is a first audio selector for selecting one of the digital audio signals from the first audio delay adjusting unit 304 or the second audio delay adjusting unit 605.

Further, reference numeral 12 denotes the second video selector shown in FIG. 1, and reference numeral 13 denotes the second audio selector shown in FIG. FIG.
, 14 is the output signal encoder shown in FIG.
Reference numeral 1 denotes a first reference sampling YC signal for adding an arbitrary character to the image based on the first reference sampling YC signal selected by the second video selector 12 or adding copyright information to the image. A signal insertion unit 142 for inserting various additional information signals such as a character signal and copyright information. When a signal signal is inserted into the first reference sampling YC signal by the signal insertion unit 141,
Character generating means for generating the character signal,
Reference numeral 43 denotes a character generation unit 14 for designating a character required for additional display on an image based on the first reference sampling YC signal.
The character control means 144 for controlling the generation of the character signal by means of the signal encoder 144 encodes Cr and Cb of the first reference sampling YC signal to which various information has been inserted and added by the signal inserting means 141, and converts the encoded signal into a digital subcarrier color signal C. This is a color signal encoding means for conversion.

In FIG. 8, reference numeral 15 denotes an output signal D / A converter shown in FIG. 1, and 151 denotes a first D / A converter for converting a digital audio signal from the second audio selector 13 into an analog audio signal in an analog format. Means 152, second D / A converting means 153 for converting the luminance signal Y component of the first reference sampled YC signal into which various information has been inserted and added by the signal inserting means 141 into an analog luminance signal Y 'in analog form. Is a third D / A conversion means for converting the digital subcarrier chrominance signal from the chrominance signal encoding means 144 into an analog analog subcarrier chrominance signal C ', and 154 is an analog signal from the second D / A conversion means 152. Luminance signal Y '
And an analog sub-carrier color signal C ′ from the third D / A converter 153 to output an analog composite video signal.

In FIG. 9, reference numeral 8 denotes the first converter shown in FIG. 9 is a DV encoder shown in FIG.
A decoder 901 compresses the second reference sampled YC signal output from the first converter 8 on a frame-by-frame basis using a DV compression method different from the above-described MPEG compression processing to obtain a frame-based video DV compressed signal. DV
A compression unit 902 compresses the digital audio signal output from the first audio selector 702 within a predetermined time range of a frame unit after performing a pulse code modulation (PCM) process, and generates a frame-unit audio DV compressed signal. DV compression means 903 for obtaining the video DV compression means 9
01 and the audio DV
The frame unit audio DV compression signal from the compression unit 902 and the subcode signal including the time code and the like generated by the subcode generation and reading unit 907 are synthesized by time sharing according to a predetermined method corresponding to the DV format. A DV stream synthesizing unit that generates a DV frame unit stream input / output to / from the DVC recording / reproducing unit 19, etc., 904 converts the DV frame unit stream output from the DVC recording / reproducing unit 19 or the like into frame unit video DV compression. AVS separation means 905 for separating a signal, a frame-based audio DV compressed signal and a sub-code signal, and a PCM process after decompressing the frame-based audio DV compressed signal separated from the DV frame-based stream by the AVS separation means 904 to obtain a digital signal. DV audio decompression means 906 for obtaining an audio signal, Frame unit video DV to in VS separating means 904 is separated from the DV frame unit streams
DV video decompression means 907 for decompressing the compressed signal to obtain the second reference sampled YC signal, and 907 is a subcode generation and reading means for generating and reading a subcode signal.

Further, reference numeral 11 denotes a second converter shown in FIG. In addition, for each of the components shown in FIGS. 2 to 9 described above, the main controller 16 converts the composite video signal or the S video luminance signal which is an analog or digital video signal into an analog video switch means 104. And a control signal for controlling the selection switching operation performed by the digital video switch means 305 and the digital sub-carrier color signal switch means 306.
A control signal for generating their operation timing is supplied to the MPEG decoding control means 606 or the MPEG decoding control means 606 or the MPEG encoding control means 406 or the signal inserting means 141.
A standard bus stream, D-VH, output from the first and second digital bus input / output interfaces 5, 10
For an MPEG transport stream recorded in the S (or HDD, DVD, etc.) system 21, a DV frame unit stream recorded in the DVC recording / reproducing unit 19 and the like, and various analog signals output from the analog signal output terminal A22, Copyright information obtained from the copyright detection means 2 is added, and the first and second audio selectors 702 and 13, the first and second video selectors 701 and
12 to supply a control signal for switching control of the digital audio signal and the first reference sampling YC signal by the digital signal generator 12 or the character generator 142.
Supplies a selection control signal for character selection designation by the character control means 143 when a character is generated, and generates and reads a subcode consisting of a time code and sends and receives a subcode signal in the subcode generation and reading means 907. Supply a control signal for control.

In FIG. 10, reference numeral 19 denotes the DVC shown in FIG.
The recording / reproducing unit 191 is a DV for recording on the magnetic tape J19.
An error correction signal (E
Recording amplifier (ECC REC)
Amp), 192 is the DV amplified by the recording amplifier 191.
When recording the frame unit stream on the magnetic tape J19 or reproducing the DV frame unit stream from the magnetic tape J19, the magnetic tape running mechanism unit for running the magnetic tape J19 at a predetermined speed. A DV frame unit stream amplified by the recording amplifier 191 is recorded on a magnetic tape J19 running by the mechanism unit 192 through a rotating magnetic head,
When reproducing a DV frame unit stream from the running magnetic tape J19 through the rotary magnetic head, the rotary head mechanism rotates the rotary magnetic head at a predetermined speed. 194 denotes a magnetic tape through the rotary magnetic head of the rotary head mechanism 193. A reproduction amplifier (EQ P.E.) that equalizes (EQ) the DV frame unit stream reproduced from J19, performs error correction on the DV frame unit stream based on an error correction signal (ECC), and then amplifies the signal. B Amp), 1
Reference numeral 95 denotes a mechanism system control means for controlling and controlling each of the magnetic tape running and rotating head mechanisms 192 and 193 so that they operate as instructed.

The operation of the signal conversion device configured as described above will be described below. As a basic schematic operation, this signal conversion device adds copyright information to an analog format video signal and audio signal, an MPEG transport stream or a DV frame unit stream, and converts an analog format video signal and audio signal to M
A PEG transport stream or a DV frame unit stream is converted and further output as a standard bus stream. An MPEG transport stream or a DV frame unit stream which is converted and recorded based on the standard bus stream or directly recorded is converted to an analog format. Convert to video signal and audio signal and output, MPEG
The format of the stream signal is mutually converted between the transport stream and the DV frame unit stream.

The above operation will be described in detail mainly by dividing it into the following four basic functions. Each function including these basic functions is selected by an operation on the input operation panel 17 performed by the user, and is executed when each component is instructed and controlled through the main controller 16. (Basic Function 1) The operation of converting an analog video signal and audio signal into an MPEG transport stream or a DV frame unit stream will be described.

First, when converting an analog video signal and an audio signal into an MPEG transport stream, the first switch 20 is set so that the terminal C3 of the audio / video MPEG encoder 4 is connected to the D-VHS system 21. Switch.

In the input signal A / D converter 1, the second A / D converter 102 converts analog video signals and audio signals input from the analog signal input terminal A11 into analog video signals. The analog composite video signal or the analog S video luminance signal selected by the switch unit 104 is converted into a digital composite video signal or a digital S video luminance signal as a digital video signal, respectively.
The A / D converter 103 converts the analog S video subcarrier color signal as an analog video signal into a digital subcarrier color signal as a digital video signal, and the first A / D converter 101 converts the analog audio signal into a digital audio signal. Convert to

In the input signal decoder / converter 3, the digital A / D converter
If the analog video signal to the converter 102 is an analog composite video signal, the second A / D converter 10
The digital composite video signal is separated into a digital luminance signal Y and a digital sub-carrier chrominance signal C as a digital video signal from the second A / D conversion means 102. In response to the selection of the input of the analog S video luminance signal, the digital subcarrier chrominance signal switch means 306
Sub-carrier chrominance signal C from the digital YC separation means 301 or the third A / D conversion means 1 selected by
The digital subcarrier chrominance signal C from C.03 is decoded into digital chrominance signals Cr and Cb.

The digital YC selected by the digital video switch means 305 in response to the input selection of the analog composite video signal or the analog S video luminance signal to the second A / D conversion means 102 by the time axis fluctuation removing means 303. The digital luminance signal Y from the separation means 301 or the digital S from the second A / D conversion means 102
The image luminance signal Y and the digital color difference signals Cr and Cb from the color difference decoding means 302 are output as a first reference sampled YC signal after removing their fluctuations on the time axis.

Here, when decoding into digital color difference signals Cr and Cb, the color difference decoding means 302
For each of r and Cb, when the sampling frequency of Cr and Cb of the first reference sampled YC signal is m and the sampling frequency fy of Y is m, the sampling frequency fc (odd) of the odd lines of Cr and Cb is nl・ M / 4 (n
1 = 2), the sampling frequency fc (even) of even lines of Cr and Cb is n2 · m / 4 (n2 = 0 or 2), and the sampling frequency fy of Y: Cr, Cb
Sampling frequency fc (odd) of odd-numbered line: C
The sampling frequency fc (ev
en) = fy: fc (odd): fc (even) =
m: n1 · m / 4: n2 · m / 4 = 4: nl: n2. FIG. 11 and FIG. 12 are schematic diagrams showing these relationships. FIG. 11A shows the case of NTSC, and FIG. 12 shows the case of PAL.

On the other hand, the first audio delay adjusting means 304 determines the amount of delay between the first A / D conversion means 101 and the audio MPEG conversion means 403 by processing the digital video signal to produce a video MPEG conversion means 402. Adjust to match the amount of delay before input to.

In the audio / video MPEG encoder 4,
The standard signal converting means 401 allows the time axis fluctuation removing means 3
03, the first reference sampled YC signal from MPE
The video-to-MPEG converter 402 converts the standardized signal from the standard signal converter 401 into a standardized signal, which is a standard signal format suitable for G encoding.
EG compression is performed to obtain a video elementary stream.
02 is packetized from the video elementary stream.

On the other hand, the audio MPEG conversion means 403 MPEG-compresses the digital audio signal from the first audio delay adjusting means 304 to obtain an audio elementary stream.
The audio elementary stream from the conversion unit 403 is packetized.

The video packetizing means 404 and the audio packetizing means 405 are provided by the MPEGTS combining means 407.
The MPEG transport stream is obtained by synthesizing each of the packetized elementary streams from the D-VHS system 21 via the first switch 20.
To record.

Next, when converting an analog video signal and an audio signal into a DV frame unit stream, the first video selector 701 and the first video selector 701 of the first selector 7 are used.
Of the input signal decoder / converter 3 and the first converter 8
Terminal H5 of the DV encoder / decoder 9
4 and the second switch 18 is switched so that the terminal H3 of the DV encoder / decoder 9 and the terminal J1 of the DVC recording / reproducing unit 19 are connected.

Terminal B of input signal decoder / converter 3
The first reference sampled YC signal output from the first reference sampler 5 is converted into a second reference sampled YC signal in DV format suitable for DV encoding by the first converter 8 through the first video selector 701. , DV encoder / decoder 9, video DV compression means 90
According to 1, the second reference sampling YC signal output from the first converter 8 is compressed on a frame basis by a DV compression method different from the above-described MPEG compression processing.
Obtain a frame unit video DV compression signal.

Here, the first converter 8 converts the first reference sampled YC signal from the first video selector 701 into a second reference sampled YC signal when converting the signal into a second reference sampled YC signal. For the sampled YC signal, the line sampling frequency of each of Y, Cr, and Cb is different from the above 4: nl: n2 relationship.
It is set so as to have a relationship of k2 (described later).

On the other hand, the digital audio signal output from the terminal B 6 of the input signal decoder / converter 3 is passed through the first audio selector 702, and is output from the DV encoder / decoder 9 by the audio DV compression means 902 to the pulse code module. After duration (PCM) processing, compression is performed within a predetermined time range in frame units to obtain a frame-based audio DV compressed signal.

Then, in the DV encoder / decoder 9, the DV stream synthesizing means 903 outputs the video DV.
A frame unit video DV compression signal from the compression unit 901 and a frame unit audio D from the audio DV compression unit 902.
The V-compressed signal and the sub-code signal including the time code and the like generated by the sub-code
It combines by time sharing according to a predetermined method corresponding to the V format to generate a DV frame unit stream input / output to / from the DVC recording / reproducing unit 19 and the like.

The DV frame unit stream output from the DV stream synthesizing means 903 of the DV encoder / decoder 9 is passed through the second switch 18 to the DVC
The information is recorded in the recording / reproducing unit 19. (Basic function 2) An operation of converting an MPEG transport stream or a DV frame unit stream into an analog video signal and audio signal will be described.

First, when converting an MPEG transport stream into an analog video signal and audio signal, the second video selector 12 and the second audio selector 13 are connected to the terminals D 1 and D 2 of the audio / video MPEG decoder 6. And the terminal F4 of the output signal encoder 14 and the terminal G5 of the output signal D / A converter 15 are switched, and the first switch 20 is set to D-
Switching is performed so that the VHS system 21 and the terminal D3 of the audio / video MPEG decoder 6 are connected.

M reproduced from the D-VHS system 21
The PEG transport stream is passed through the first switch 20, in the audio / video MPEG decoder 6, by the MPEG system
The EG transport stream is separated into a video elementary stream and an audio elementary stream, and the video MPEG decoding unit 602 expands the video elementary stream from the MPEG system decoding unit 601 and converts it into a standardized signal, and adjusts the video delay. Means 60
4, the delay amount generated when the video MPEG decoding means 602 converts the signal into a standardized signal, and the audio MPE
In order to eliminate the difference from the amount of delay that occurs when converting to a digital audio signal by the G decoding unit 603, the video M
The delay amount with respect to the standardized signal from the PEG decoding unit 602 is adjusted, and the standardized signal output from the video delay adjusting unit 604 after being adjusted by the inverse standard signal converting unit 607 in accordance with the delay amount on the audio signal side is standardized. The signal is converted into a first reference sampled YC signal by a conversion process reverse to that of the signal conversion unit 401.

On the other hand, the audio elementary stream from the MPEG system decoding means 601 is decompressed by the audio MPEG decoding means 603 and converted into a digital audio signal.
In order to eliminate the difference between the amount of delay that occurs when converting to a digital audio signal by the PEG decoding unit 603 and the amount of delay that occurs when converting to a standardized signal by the video MPEG decoding unit 602, the audio MPEG decoding unit The delay amount for the digital audio signal from the 603 is adjusted.

The first reference sampled YC signal from the inverse standard signal conversion means 607 of the audio / video MPEG decoder 6 is passed through the second video selector 12 and output signal encoder 14 by the signal insertion means 141 to the output signal encoder 14.
In some cases, various additional information signals such as a character signal and copyright information are inserted as needed by the user, and the color signal encoding unit 144 uses the first reference sampling YC signal Cr, Cb is encoded and converted into a digital subcarrier chrominance signal C.

Further, in the output signal D / A converter 15, the second D / A conversion means 152 converts the luminance signal Y component of the first reference sampled YC signal from the signal insertion means 141 into an analog analog luminance signal. Y ′, and the third D / A converter 153 converts the digital subcarrier chrominance signal from the chrominance signal encoder 144 into an analog subcarrier chrominance signal C ′ in analog form. The analog luminance signal Y 'from the second D / A conversion means 152 and the third D / A conversion means 153
And outputs an analog composite video signal.

On the other hand, the second audio / video MPEG decoder 6
The digital audio signal from the audio delay adjusting means 605 of FIG.
In the A converter 15, the first D / A conversion means 15
1 converts it into an analog audio signal in an analog format.

The analog composite video signal from the mixing means 154 of the output signal D / A converter 15, the analog S video luminance signal from the second D / A conversion means 152, and the analog D / A conversion signal from the third D / A conversion means 153 The analog video signal of the analog S video sub-carrier color signal of
And the analog audio signal from the D / A conversion means 151
The signal is output to the analog signal output terminal A22.

Next, when converting a DV frame unit stream into an analog video signal and audio signal, the second video selector 12 and the second audio selector 13
To the terminal H6 of the second converter 11 and the terminal H1 of the DV encoder / decoder 9 and the output signal encoder 1
4 and the terminal G5 of the output signal D / A converter 15 are connected so that the second switch 18 is connected to the terminal J1 of the DVC recording / reproducing unit 19 and the DV.
Switching is performed so that the terminal H3 of the encoder / decoder 9 is connected.

The DV reproduced from the DVC recording / reproducing unit 19
For the frame-based stream, the second switch 18
Through the DV encoder / decoder 9
The S-separation unit 904 separates the frame-based video DV compressed signal, the frame-based audio DV compressed signal, and the subcode signal, and the DV-video decompression unit 906 separates the frame-based video separated from the DV frame-based stream by the AVS separation unit 904. The DV compressed signal is expanded to obtain a second reference sampled YC signal, and the DV audio expanding means 905 expands the frame-based audio DV compressed signal separated from the DV frame unit stream by the AVS separating means 904, and then performs PCM processing. Then, a digital audio signal is obtained, and the subcode generation and reading means 907 generates and reads a subcode signal.

Further, the second converter 11 outputs D
The second reference sampling YC signal from the DV video decompression means 906 of the V encoder / decoder 9 is converted into a first reference sampling YC signal.

In response to the first reference sampling YC signal from the second converter 11, the second video selector 12
In the output signal encoder 14, the signal insertion unit 141 inserts various additional information signals such as character signals and copyright information as needed by the user, and the color signal encoding unit 144 inserts the signal insertion unit 141. Reference sampling YC output from
The signals Cr and Cb are encoded and converted into a digital subcarrier color signal C.

Further, in the output signal D / A converter 15, the second D / A conversion means 152 converts the luminance signal Y component of the first reference sampling YC signal from the signal insertion means 141 into an analog analog luminance signal. Y ′, and the third D / A converter 153 converts the digital subcarrier chrominance signal from the chrominance signal encoder 144 into an analog subcarrier chrominance signal C ′ in analog form. The analog luminance signal Y 'from the second D / A conversion means 152 and the third D / A conversion means 153
And outputs an analog composite video signal.

On the other hand, the DV of the DV encoder / decoder 9
For the digital audio signal from the audio decompression means 905,
Through the second audio selector 13, the output signal D / A converter 15 converts the signal into an analog type analog audio signal by the first D / A converter 151.

The analog composite video signal from the mixing unit 154 of the output signal D / A converter 15, the analog S video luminance signal from the second D / A conversion unit 152, and the analog D / A conversion signal from the third D / A conversion unit 153. The analog video signal of the analog S video sub-carrier color signal of
And the analog audio signal from the D / A conversion means 151
The signal is output to the analog signal output terminal A22.

Here, the input operation panel 17 performed by the user
In the case where a character arbitrarily created by the user is incorporated into an analog video obtained by converting the MPEG transport stream or the DV frame unit stream by the operation of the character control unit 143, the character control unit 143 is operated in accordance with an instruction based on the user's operation. Thus, the character generation means 142 controls the generation of a character signal by the character generation means 142 in order to designate a character required for additional display on the image by the first reference sampling YC signal. When a character signal is inserted into the first reference sampling YC signal by the signal insertion means 141 by the character generation means 142, the character signal is generated, and this character signal is converted by the signal insertion means 141 into the first reference sampling YC signal. It is inserted into the issue.

In the basic function 1, the MPEG transport stream or DV frame unit stream converted from the analog video signal and analog audio signal input to the analog signal input terminal A11 is converted to the D-VHS system 21 or the DVC recording. A description will be given of a bus interface function in the case of outputting a standard bus stream such as an IEEE 1394 bus stream from the first digital bus line input / output terminal D11 or the second digital bus line input / output terminal D22 instead of recording on the reproduction unit 19. I do.

Among the basic functions 1, the MPEG transport stream converted from the analog video signal and the analog audio signal input to the analog signal input terminal A11 is transmitted through the first switch 20 to the D-VHS system 2.
1, the first switch 20 is switched so that the terminal C3 of the audio / video MPEG encoder 4 is connected to the first digital bus input / output interface 5, and the terminal C3 of the audio / video MPEG encoder 4 is connected. Is supplied to the first digital bus input / output interface 5 through the first switch 20, and is converted into a standard bus stream such as an IEEE 1394 bus stream by the first digital bus input / output interface 5. , Output from the first digital bus line input / output terminal D11, and connect to the first digital bus line input / output terminal D11 in advance.
Recording is performed on a recording device externally connected through a standard bus such as a bus.

The MP from the D-VHS system 21
The EG transport stream is sent to the first switch 20
Through a first digital bus input / output interface 5 to convert the data into a standard bus stream such as an IEEE 1394 bus stream, output from a first digital bus line input / output terminal D11, and Recording can also be performed on a recording device externally connected to the input / output terminal D11 through a standard bus such as an IEEE 1394 bus.

In the basic function 1, the DV frame unit stream converted from the analog video signal and the analog audio signal input to the analog signal input terminal A11 is transmitted to the DVC recording / reproducing unit 19 through the second switch 18.
, The second switch 18 is switched so that the terminal H3 of the DV encoder / decoder 9 is connected to the second digital bus input / output interface 10, and the terminal H3 of the DV encoder / decoder 9 is D
The V-frame unit stream is supplied to the second digital bus input / output interface 10 through the second switch 18, and the second digital bus input / output interface 10
Thus, for example, the data is converted into a standard bus stream such as an IEEE 1394 bus stream, output from the second digital bus line input / output terminal D22, and externally connected to the second digital bus line input / output terminal D22 in advance through a standard bus such as an IEEE 1394 bus. Record in the connected recording device.

The DV frame unit stream from the DVC recording / reproducing unit 19 is converted into a standard bus stream such as an IEEE 1394 bus stream via the second switch 18 and the second digital bus input / output interface 10. Thus, the data can be output from the second digital bus line input / output terminal D22 and recorded in advance on a recording device externally connected to the second digital bus line input / output terminal D22 through a standard bus such as an IEEE 1394 bus.

Next, in the above basic function 2, the MPE
When the G transport stream or DV frame unit stream is converted into an analog video signal and an analog audio signal and output from the analog signal output terminal A22, the MPEG transport stream is
Instead of inputting from the D-VHS system 21 through the first switch 20, the first digital bus input / output interface 5 is based on a standard bus stream such as an IEEE1394 bus stream from the first digital bus line input / output terminal D11. From the second digital bus line input / output terminal D22 instead of inputting the DV frame unit stream from the DVC recording / reproducing unit 19 through the second switch 18, A bus interface function when inputting from the second digital bus input / output interface 10 through the second switch 18 based on a standard bus stream such as a bus stream will be described.

In the basic function 2, when the MPEG transport stream is converted into an analog video signal and an analog audio signal and output from the analog signal output terminal A22, the D-VHS system 21 is used as the MPEG transport stream. From the first switch 20
, The first switch 20 is switched so that the terminal D3 of the audio / video MPEG decoder 6 and the first digital bus input / output interface 5 are connected to each other. Terminal D
A standard bus stream such as an IEEE 1394 bus stream input to a first digital bus line input / output terminal D11 from a playback device externally connected to the digital bus input / output terminal D11 via a standard bus such as an IEEE 1394 bus to the first digital bus input / output interface 5. MPEG supplied and converted by the first digital bus input / output interface 5
The transport stream is input to the terminal D3 of the audio / video MPEG decoder 6 through the first switch 20.

In the basic function 2, when a DV frame unit stream is converted into an analog video signal and an analog audio signal and output from the analog signal output terminal A22, the DV frame unit stream is
Instead of inputting from the DVC recording / reproducing unit 19 through the second switch 18, the second switch 18 is switched so that the terminal H3 of the DV encoder / decoder 9 is connected to the second digital bus input / output interface 10. A standard bus such as an IEEE 1394 bus stream input to the second digital bus line input / output terminal D22 from a playback device externally connected to the second digital bus line input / output terminal D22 in advance through a standard bus such as an IEEE 1394 bus. The stream is supplied to the second digital bus input / output interface 10, and the DV frame unit stream converted by the second digital bus input / output interface 10 is supplied to the second switch 18 via the second switch 18.
It is input to the terminal H3 of the V encoder / decoder 9. (Basic function 3) MPEG transport stream and D
An operation of mutually converting the format of a stream signal between a V-frame unit stream and a stream will be described.

First, when converting the format of a stream signal from an MPEG transport stream to a DV frame unit stream, the first switch 20 is set to a D-VH
Terminal D of S system 21 and audio / video MPEG decoder 6
3, and the second switch 18 is switched so that the DVC recording / reproducing unit 19 and the terminal H3 of the DV encoder / decoder 9 are connected.

Further, the D-VHS system 21 and the D-VHS
The D-VHS system 21
, And the DVC recording / reproducing unit 19 is set in a state where each recording operation is possible (pause or the like).

The D-VHS system 21 and the DVC recording / reproducing unit 19 are drive-controlled by releasing the pause, and
The information pre-recorded in the MPEG transport stream format on the VHS system 21 is reproduced, and the MPEG transport stream is supplied to the audio / video MPEG decoder 6 through the first switch 20. The signal is converted into a YC signal and a digital audio signal, converted to a DV frame unit stream by the basic function 1 through the first converter 8 and the DV encoder / decoder 9 via the first selector 7, and converted to the DV frame. The unit stream format information is recorded in the DVC recording / reproducing unit 19 through the second switch 18.

On the other hand, from the DV frame unit stream, M
When converting the format of a stream signal into a PEG transport stream, the first switch 20 is set to D-VH
The S system 21 and the terminal C3 of the audio / video MPEG encoder 4 are switched so as to be connected, and the second switch 18 is set to the DVC recording / reproducing unit 19 and the DV encoder /
Switching is performed so that the terminal H3 of the decoder 9 is connected.

Further, the D-VHS system 21 and the D-VHS system
The D-VHS system 21
Is recorded, and the DVC recording / reproducing unit 19 is set in a state where the respective operations of reproduction are possible (pause or the like).

The D-VHS system 21 and the DVC recording / reproducing section 19 are drive-controlled by releasing the pause, and
The information recorded in advance in the DV frame unit stream format is reproduced in the C recording / reproducing unit 19, the DV frame unit stream is supplied to the DV encoder / decoder 9 through the second switch 18, and the basic information is passed through the second converter 11. By function 2, the first reference sampling YC
Signal and a digital audio signal, and the audio / video M
Through the PEG encoder 4 and the basic function 1, MP
Converted to EG transport stream and its MPE
The information of the G transport stream format is recorded in the D-VHS system 21 through the first switch 20. (Basic Function 4) An operation of adding copyright information to an output analog video signal and audio signal, an MPEG transport stream, or a DV frame unit stream will be described.

The copyright detection means 2 detects the input signal A / D
The copyright information is detected from the digital video signal obtained from the terminal A5 of the converter 1, and the main controller 16 receives the copyright information. The main controller 16 converts the received copyright information into an analog video signal. And an audio signal, an MPEG transport stream, or a DV frame unit stream.

First, a case where copyright information is added to an MPEG transport stream or a DV frame unit stream will be described. In the audio / video MPEG encoder 4, when the packetized elementary streams from the video packetizing unit 404 and the audio packetizing unit 405 are combined by the MPEGTS combining unit 407, the MPEG encoding control unit 406 controls the header and time stamp. And the copyright information received from the copyright detection means 2 together with the signal
3 outputs an MPEG transport stream to which copyright information has been added.

In this way, the MPEG transport stream to which the copyright information obtained from the terminal C3 of the audio / video MPEG encoder 4 is added is recorded on the D-VHS system 21 through the first switch 20, for example.

Here, instead of recording on the D-VHS system 21, the MPEG transport stream is converted into a standard bus stream such as an IEEE 1394 bus stream by the first digital bus input / output interface 5 through the first switch 20. Then, it is also possible to output to the outside from the first digital bus line input / output terminal D11.

Further, an MPEG to which the copyright information obtained from the terminal C3 of the audio / video MPEG encoder 4 is added.
The transport stream is converted to a DV frame unit stream via the audio / video MPEG decoder 6, the first selector 7, the first converter 8, and the DV encoder / decoder 9, and the terminal H of the DV encoder / decoder 9
From 3 through the second switch 18, for example, recording is performed on the DVC recording / reproducing unit 19.

Here, instead of recording in the DVC recording / reproducing section 19, the DV frame unit stream is converted into a standard bus stream such as an IEEE 1394 bus stream by the second digital bus input / output interface 10 through the second switch 18. Then, it is also possible to output to the outside from the second digital bus line input / output terminal D22.

Next, a case where copyright information is added to an analog video signal and audio signal output from the analog signal output terminal A22 will be described. The output signal encoder 14 inserts the copyright information obtained from the copyright detection means 2 into the output signal encoder 14 with respect to the first reference sampling YC signal selected by the second video selector 12. , The second video selector 12
The copyright information is added to the image based on the first reference sampling YC signal from.

The digital luminance signal Y and the digital subcarrier chrominance signal C obtained from the first reference sampling YC signal to which the copyright information has been added are converted into an analog form through the output signal D / A converter 15. The signal is converted and output from the analog signal output terminal A22.

In the above functions, the coefficients n1 and n2 of 4: n1: n2 relating to the line sampling frequencies of the luminance signal Y and the color difference signals Cr and Cb are n1 = 2 when the video signal is of the NTSC system. n2 = 2, and FIG.
1 (a) shows the luminance signal Y and the color difference signal Cr in this case,
It is a schematic diagram which shows the sample point on the horizontal line of Cb. When the video signal is of the PAL system, n1 = 2, n2 =
0, in this case, the luminance signal Y and the color difference signal Cr,
The sample points on the horizontal line of Cb are as shown in the schematic diagram of FIG.

The luminance signal Y and the color difference signals Cr, C
4: k1: k2 related to each line sampling frequency of b
Are k1 = 1 and k2 = 1 when the video signal is in the NTSC system, and the luminance signal Y in this case is
The sample points on the horizontal lines of the color difference signals Cr and Cb are as shown in the schematic diagram of FIG. 11B (the luminance signal Y is the same as the signal shown in the schematic diagram of FIG. 11A).
When the video signal is of the PAL system, k1 = 2 and k2 = 0, and the sample points on the horizontal lines of the luminance signal Y and the color difference signals Cr and Cb in this case are as shown in the schematic diagram of FIG. .

A character arbitrarily created by the user is added to the analog video signal output from the analog signal output terminal A22 based on the analog video signal input from the analog signal input terminal A11. The operation will be described.

First, the user operates the input operation panel 17 to convert the analog video obtained from the analog signal output terminal A22 based on the analog video signal input from the analog signal input terminal A11. When incorporating an arbitrarily created character, the second video selector 12 is connected to the input signal decoder / converter 3.
Is switched so that the terminal B5 of the output signal encoder 14 and the terminal F4 of the output signal encoder 14 are connected.

The first reference sampling YC signal obtained from the terminal B5 of the input signal decoder / converter 3 by the operation of the basic function 1 is output to the output signal encoder 14 through the second video selector 12 and the signal insertion means. 141, if necessary, various additional information signals such as a character signal and copyright information are inserted according to the user's need. The first reference sampling YC signal output from the signal insertion means 141 is output by the color signal encoding means 144. Are encoded and converted into a digital subcarrier color signal C.

Here, in accordance with an instruction based on the above-mentioned operation of the user, the character control means 143 specifies to the character generation means 142 a character required for additional display on the image by the first reference sampling YC signal. In addition, when the generation of a character signal by the character generation means 142 is controlled, and the character generation means 142 inserts a character signal into the first reference sampling YC signal in the signal insertion means 141 according to this control, the character signal is generated. Then, the character signal is inserted into the first reference sampled YC signal by the signal inserting means 141.

Further, in the output signal D / A converter 15, the second D / A conversion means 152 converts the luminance signal Y component of the first reference sampling YC signal from the signal insertion means 141 into an analog analog luminance signal. Y ′, and the third D / A converter 153 converts the digital subcarrier chrominance signal from the chrominance signal encoder 144 into an analog subcarrier chrominance signal C ′ in analog form. The analog luminance signal Y 'from the second D / A conversion means 152 and the third D / A conversion means 153
And outputs an analog composite video signal.

The analog composite video signal from the mixing means 154 of the output signal D / A converter 15, the analog S video luminance signal from the second D / A conversion means 152, and the analog D / A conversion signal from the third D / A conversion means 153. The analog video signal of the analog S video sub-carrier color signal is output to an analog signal output terminal A22.

The first digital bus line input / output terminal D11 is an input / output terminal for an MPEG transport digital bus stream, and the second digital bus line input / output terminal D22 is an input / output terminal for a DV frame unit digital bus stream. But also.

Normally, when this digital bus line is connected to another external device, it is connected to either one of the two types of streams as described above, so that one input / output terminal is shared. It doesn't matter.

Therefore, these input / output terminals are integrated into one
One input / output terminal may be used, which has the advantage of saving terminals. As described above, the main controller 16 outputs the control signal for instructing and controlling each of the above-described components for each of the operations, and receives the copyright information from the copyright detection unit 2 by Each of the above components can be controlled to operate as follows.

(1) An analog video signal and audio signal input from the analog signal input terminal A11, and from the first digital bus line input / output terminal D11 via the first digital bus input / output interface 5. Input or D-VH
An MPEG transport stream input from the S system 21 or the like, or input from the second digital bus input / output terminal D22 via the second digital bus input / output interface 10 or input from the DVC recording / reproducing unit 19 or the like. Copyright information is added to the DV frame unit stream. (2) The analog video signal and the audio signal input from the analog signal input terminal A11 are converted into an MPEG transport stream or a DV frame unit stream, and are recorded in the D-VHS system 21 or the DVC recording / reproducing unit 19. From the first digital bus line input / output terminal D11 via the first digital bus input / output interface 5 or from the second digital bus line input / output terminal D22 via the second digital bus input / output interface 10. Output as a bus stream. (3) The standard bus stream input from the first digital bus line input / output terminal D11 or the standard bus input from the second digital bus line input / output terminal D22 is supplied to the D-VHS system 21 or the DVC recording / reproducing unit 19. A stream recorded after being converted via the first digital bus input / output interface 5 or the second digital bus input / output interface 10 or directly recorded by the D-VHS system 21 or the DVC recording / reproducing unit 19
The PEG transport stream or DV frame unit stream is converted into an analog video signal and audio signal, and output from an analog signal output terminal A22. (4) The standard bus stream input from the first digital bus line input / output terminal D11 is supplied to the D-VHS system 21 via the first digital bus input / output interface 5.
An MPEG transport stream that is recorded after conversion through a D-VHS system or directly recorded by the D-VHS system 21 and a standard bus stream that is input from the second digital bus line input / output terminal D22 to the DVC recording / reproducing unit 19. , After the conversion via the second digital bus input / output interface 10, or the DVC recording / reproducing unit 19
Between the DV frame stream recorded directly by
The format of the stream signal is mutually converted. And so on.

As a result, the need for audio and video equipment to have dedicated circuits, such as a plurality of types of encoders and decoders, for supporting various streams is eliminated, and without increasing the circuit scale, the analog video signal is eliminated. The signal format can be easily converted between the audio signal and the plurality of types of streams.

[0103]

As described above, according to the present invention, the main controller controls each component based on the control signal output for commanding and controlling each component and the copyright information received from the copyright detection means. For components, they can be analog and video signals and audio signals or MP
Copyright information is added to an EG transport stream or a DV frame unit stream, an analog video signal and an audio signal are converted into an MPEG transport stream or a DV frame unit stream, and output as a standard bus stream. MPE converted and recorded directly from bus stream or recorded directly
A G transport stream or a DV frame unit stream is converted into an analog video signal and an audio signal and output, and a stream signal format is mutually converted between an MPEG transport stream and a DV frame unit stream. And so on.

Therefore, in the audio / video equipment, there is no need to have a dedicated circuit such as a plurality of types of encoders and decoders for corresponding to various streams, and the video signal and the audio signal of the analog format can be obtained without increasing the circuit scale. The signal format can be easily converted between a signal and a plurality of types of streams.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a signal conversion device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an input signal A / D converter according to the embodiment;

FIG. 3 is a block diagram showing a configuration of an input signal decoder / converter according to the embodiment;

FIG. 4 is a block diagram showing a configuration of an audio / video MPEG encoder according to the embodiment;

FIG. 5 is a block diagram showing a configuration of an audio / video MPEG decoder according to the embodiment;

FIG. 6 is a block diagram showing a configuration of a selector according to the embodiment;

FIG. 7 is a block diagram showing a configuration of an output signal encoder according to the embodiment;

FIG. 8 is a block diagram showing a configuration of an output signal D / A converter according to the embodiment;

FIG. 9 is a block diagram showing a configuration of a DV encoder / decoder according to the embodiment;

FIG. 10 is a block diagram showing a configuration of a DVC recording / reproducing unit in the embodiment.

FIG. 11: 4: 2: 2 and 4: in the embodiment.
Explanatory drawing of the pixel configuration of a display image of the 1: 1 system

FIG. 12 is an explanatory diagram of a pixel configuration of a display image of a 4: 2: 0 system in the embodiment.

[Explanation of symbols]

 Reference Signs List 1 input signal A / D converter 2 copyright detection means 3 input signal decoder / converter 4 audio / video MPEG encoder 5 first digital bus input / output interface 6 audio / video MPEG decoder 7 first selector 8 first converter 9 DV encoder Decoder 10 Second digital bus input / output interface 11 Second converter 12 Second video selector 13 Second audio selector 14 Output signal encoder 15 Output signal D / A converter 16 Main controller 17 Input operation panel 18 Second Switch 19 DVC recording / reproducing unit 20 First switch 21 D-VHS system A11 Analog signal input terminal A22 Analog signal output terminal D11 First digital bus line input / output terminal D22 Second digital bus line input / output terminal Child

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04N 7/24 H04N 9/80 A 9/80 11/04 F term (reference) 5C055 AA01 AA03 BA01 BA02 CA01 DA01 EA02 EA04 FA21 GA11 HA31 JA21 5C057 AA07 AA08 AA10 AA13 BA02 CC04 DA03 EJ01 EL01 EM01 GF01 GF02 GF03 GF07 5C059 KK41 KK43 MA00 PP04 RB02 RC35 RF04 SS12 SS14 UA02 UA05 5C063 AA02 CA34 DA07 DA13 A02 BC02 BC03

Claims (7)

[Claims] 1. An A / D converter for converting a video signal and an audio signal from an analog format to a digital format, and copyright detecting means for detecting copyright information from a digital video signal obtained from the A / D converter. The digital video signal from the A / D converter is separated into a luminance signal Y and color difference signals Cr and Cb, which are signal components thereof, and is converted into a first reference sampling YC signal composed of the signals. A decoder / converter for setting each sampling frequency for the Y, Cr and Cb at the time of
The Y and Cr, Cb from the decoder converter
Together with the digital audio signal from the A / D converter
A first method for mutually converting the format of a stream signal between an MPEG encoder that generates an MPEG transport stream by performing EG and an MPEG transport stream from the MPEG encoder and a standard bus stream for input / output to / from the outside. And decoding the MPEG transport stream whose stream signal format has been converted from the external standard bus stream by the first digital bus input / output interface and the first reference sampling. An MPEG decoder for obtaining a YC signal and a digital audio signal of the same format, a first reference sampled YC signal from the decoder / converter or the MPEG decoder, and data associated with the first reference sampled YC signal. And a first converter for converting the first reference sampling YC signal from the first selector into a second reference sampling YC signal in DV format adapted for DV encoding. And a second reference sampling YC signal from the first converter and a digital audio signal from the first selector, added to a subcode including a time code and compressed in a DV format. DV-encodes the unit stream, decodes the DV-compressed video signal and audio signal into the second reference sampled YC signal and digital audio signal for the DV frame unit stream, and detects the subcode. DV encoder / decoder and DV encoder / decoder in the DV encoder / decoder Digital bus input / output interface for mutually converting the format of a stream signal between a frame unit stream and a standard bus stream for input / output to / from the outside, and the second reference from the DV encoder / decoder A second converter for converting the sampled YC signal into the first reference sampled YC signal, and the second converter or the M
A second selector for selecting a first reference sampled YC signal from the PEG decoder or the decoder converter, and a first reference sampled YC signal from the second converter or the MPEG decoder or the decoder converter. A third selector for selecting a digital audio signal, and arbitrarily generated character information and copyright information from the copyright detection means are required for the first reference sampling YC signal from the second selector. An encoder that encodes a digital subcarrier color signal based on a color difference signal composed of Cr and Cb, which is separately obtained and separated, and Y in the first reference sampling YC signal from the encoder and the encoder Digital subcarrier chrominance signal from the A digital-to-analog (D / A) converter for converting a digital audio signal from a digital signal from a digital format to an analog format, and a main controller for outputting a command for controlling the operation of each of the elements. , And receives the copyright information from the copyright detecting means, so that the analog video signal and the audio signal or the MP
Adding the copyright information to the EG transport stream or the DV frame unit stream, converting the analog format video signal and audio signal into the MPEG transport stream or the DV frame unit stream, and outputting as a standard bus stream; The MP
The format of the stream signal is mutually converted between the EG transport stream and the DV frame unit stream, and the MPEG transport stream or the DV
A signal conversion device configured to convert the standard bus stream of a frame unit stream into the analog video signal and audio signal. 2. An A / D converter comprising: a first A / D converter for converting an analog audio signal into a digital audio signal; and an analog composite video signal or an analog S video luminance signal as an analog video signal. A second A / D converter for converting a digital composite video signal or a digital S video luminance signal into a digital sub video signal, and converting an analog S video subcarrier color signal as the analog video signal into a digital subcarrier color signal as the digital video signal. A third A / D converter, and a decoder / converter, wherein an analog video signal to the second A / D converter is the analog composite video signal,
Digital YC separation means for separating the digital composite video signal as a digital video signal from the second A / D conversion means into a digital luminance signal Y and a digital subcarrier chrominance signal C; The digital sub-carrier color signal C or the third A / D converter separated by the digital YC separation means in response to input selection of the analog composite video signal or analog S video luminance signal as an analog video signal to the conversion means. The digital subcarrier chrominance signal C from the
color difference decoding means for decoding into r and Cb, time axis fluctuation removing means for removing the time axis fluctuations of Y, Cr and Cb and outputting as a first reference sampled YC signal; First audio delay adjusting means for adjusting the amount of delay between the D converting means and the audio MPEG converting means so as to match the amount of delay until the digital video signal is processed and inputted to the video MPEG converting means And the MPEG encoder converts the first reference sampled YC signal from the time axis fluctuation removing means into an MPEG signal.
Standard signal conversion means for converting to a standardized signal which is a standard signal format suitable for encoding, video MPEG conversion means for MPEG-compressing the standardized signal from the standard signal conversion means to obtain a video elementary stream,
Audio MPEG conversion means for MPEG-compressing the digital audio signal from the first audio delay adjustment means to obtain an audio elementary stream, and video packetizing means for packetizing the video elementary stream from the video MPEG conversion means And audio packetizing means for packetizing the audio elementary stream from the audio MPEG conversion means, and MPEG encoding control for adding an additional signal such as a header or a time stamp when each of the video and audio elementary streams is packetized. And MPEGTS combining means for combining the packetized elementary streams from the video packetizing means and the audio packetizing means to obtain an MPEG transport stream. And an MPEG system decoder means for separating the transport stream into said video elementary stream and the audio elementary stream, the M
A video MP for expanding a video elementary stream from a PEG system decoding means and converting the stream into the standardized signal
EG decoding means, audio MPEG decoding means for expanding the audio elementary stream from the MPEG system decoding means and converting it to the digital audio signal, and audio generated when the video MPEG decoding means converts the signal into a standardized signal. A video delay adjusting means for eliminating a difference in delay amount from a signal, and a second audio delay adjusting means for eliminating a difference in delay amount from a video signal generated at the time of conversion to a digital audio signal by the audio MPEG decoding means. Means for controlling separation of video and audio elementary streams by the MPEG system decoding means, detecting a time stamp from the MPEG transport stream, and based on the time stamp,
MPEG decoding control means for controlling the difference adjustment of the signal delay amount by the video delay adjusting means and the second audio delay adjusting means; and a standardized signal from the video delay adjusting means, An inverse standard signal converting means for converting the signal into the first reference sampled YC signal by a conversion process, wherein the first selector is provided with a first reference signal from the time axis fluctuation removing means or the inverse standard signal converting means. A first video selector for selecting a sampling YC signal, and a first audio selector for selecting a digital audio signal from the first audio delay adjusting means or the second audio delay adjusting means, and The decoder converts the second reference sampled YC signal from the first converter into a DV signal different from the MPEG compression process.
A video DV compression means for compressing each frame by a compression method to obtain a frame-based video DV compression signal;
Audio DV compression means for compressing a digital audio signal from the audio selector of the above in a predetermined time range of a frame unit after performing a PCM process to obtain a frame-based audio DV compression signal, and a frame from the video DV compression means. A DV frame unit stream is generated by synthesizing a unit video DV compression signal, a frame unit audio DV compression signal from the audio DV compression unit, and a subcode signal including a time code or the like by time sharing according to a predetermined method. D
V stream synthesizing means, AVS separating means for separating the DV frame unit stream into the frame unit video DV compressed signal, frame unit audio DV compressed signal and the subcode signal, and frame unit audio DV from the AVS separating means. DV audio expansion means for obtaining the digital audio signal by performing PCM processing after expanding the compressed signal, and D obtaining the second reference sampling YC signal by expanding the frame unit video DV compression signal from the AVS separation means.
V video decompression means and sub-code generation and reading means for generating and reading the sub-code, wherein an encoder is provided with a character signal and a copyright signal in the first reference sampling YC signal selected by a second selector. Signal insertion means for inserting various information such as information, character generation means for generating the character signal to be inserted into the first reference sampling YC signal, and designation of a character required for display to the character generation means And a color signal encoding unit that encodes Cr and Cb of the first reference sampled YC signal to which various information has been inserted and added by the signal insertion unit and converts the Cr and Cb into the digital subcarrier color signal C. And a D / A converter for receiving a digital sound from the third selector. First D / A conversion means for converting a signal into an analog audio signal in an analog format, and converting the Y of the first reference sampling YC signal into which various information has been added by the signal insertion means into an analog luminance signal in an analog format A second D / A converter for converting, a third D / A converter for converting a digital subcarrier chrominance signal from the chrominance signal encoding unit into an analog subcarrier chrominance signal in an analog format, and the analog luminance signal And mixing means for mixing the analog sub-carrier color signal and outputting the analog composite video signal, the color difference decoding means,
At the time of decoding to the digital color difference signals Cr and Cb, the respective sampling frequencies of Cr and Cb of the first reference sampled YC signal correspond to Cr and Cb.
When the sampling frequency fy of the Y is m, the C
r, sampling frequency fc (od of odd lines of Cb)
d) is nl · m / 4 (nl = 2), and the sampling frequency fc (even) of the even lines of Cr and Cb is n2.
M = 4 (n2 = 0 or 2), the sampling frequency fy of the Y: the sampling frequency fc (odd) of the odd lines of Cr and Cb: the sampling frequency fc (even) of the even lines of Cr and Cb = f
y: fc (odd): fc (even) = m: n1 · m
/ 4: n2 · m / 4 = 4: nl: n2, and the first converter is connected to a first video selector from a first video selector in the first selector. The reference sampling YC signal is converted and converted into the second reference sampling YC signal. At the time of the conversion, the Y,
Each line sampling frequency of Cr and Cb is 4: n
The relationship is set so as to have a relationship of 4: k1: k2 different from the relationship of 1: n2, and the second converter is provided with a second reference sampling YC from the DV video decompression means in the DV encoder / decoder. Converting the signal into the first reference sampling YC signal, and generating a control signal for controlling selection switching of a composite video signal or an S video luminance signal as a video signal, The MPE
A control signal for generating their operation timing is supplied to the G encode control means and the MPEG decode control means, and a standard bus stream and analog signal output from the first and second digital bus input / output interfaces are provided. Copyright information from copyright detection means is added to various analog signals output from the signal output terminal, and digital audio signals and the first reference sampling signals are output by first, second and third selectors. A control signal for switching control of the YC signal is supplied, a selection control signal for selecting and specifying a character by the character control means is supplied, and a subcode consisting of a time code or the like in the subcode generation and reading means is supplied. Generate reading And a control signal for controlling the transmission and reception of the subcode, an analog S video signal comprising the analog composite video signal and the analog luminance signal and the analog subcarrier color signal as the analog audio signal and the analog video signal; And an analog signal output for outputting the analog composite video signal, the analog luminance signal, and the analog sub-carrier color signal as the analog audio signal and the analog video signal. A first digital bus line input / output terminal connected to the first digital bus input / output interface for inputting / outputting the standard bus stream to / from the first digital bus input / output interface; Second digital bus A second digital bus line input / output terminal connected to an output interface for inputting / outputting the standard bus stream to / from the second digital bus input / output interface, and executing various controls by the main controller. ,
The signal conversion device according to claim 1, further comprising operation input means for performing an operation input for instructing the main controller to execute the execution. 3. A D / D converter interposed between a DV encoder / decoder and a second digital bus input / output interface.
A second switch for bidirectionally switching the input / output connection of the V frame unit stream, and a DV stream recording / reproducing means connected to the second switch for recording / reproducing the DV frame unit stream; An amplifier for adding and correcting an error correction signal to the DV frame unit stream, and a recording and reproducing unit; a magnetic tape running mechanism for recording the DV frame unit stream amplified by the amplifier on a magnetic tape; A rotary head mechanism for recording the amplified DV frame unit stream through a rotary magnetic head on a magnetic tape running by a running mechanism, and a DV frame unit stream reproduced from the rotary head mechanism, and Previous for DV frame stream A reproduction amplifier for amplifying the signal after performing error correction on the basis of the error correction signal; and a mechanism system control means for controlling and controlling the respective sections, wherein the second switch is provided with the DV encoder / decoder or the second 3. The signal conversion device according to claim 1, wherein the DV frame unit stream in the digital bus input / output interface is switched to input / output to / from the DV stream recording / reproducing means. . 4. A first switch interposed between an MPEG encoder / decoder and a first digital bus input / output interface for bidirectionally switching the input / output connection of an MPEG transport stream; MPEG stream recording and reproducing means for recording and reproducing the MPEG transport stream, wherein the first switch is connected to the MPE.
The MPEG transport stream from the G encoder or the first digital bus input / output interface is switched to be recorded on the MPEG stream recording / reproducing means, and the MPEG transport stream reproduced from the MPEG stream recording / reproducing means is switched. 4. The signal conversion device according to claim 1, wherein the signal is supplied to the MPEG decoder or the first digital bus input / output interface. 5. Coefficients n1 and n2 of 4: n1: n2 relating to Y, Cr, and Cb line sampling frequencies
Are n1 = 2 and n2 = 2 when the video signal is in the NTSC format.
5. The signal conversion device according to claim 1, wherein n1 = 2 and n2 = 0 at the time of PAL. 6. Coefficients k1 and k2 of 4: k1: k2 relating to Y and each line sampling frequency of Cr and Cb.
Means that when the video signal is in the NTSC system, k1 = 1 and k2 = 1
5. The signal conversion device according to claim 1, wherein k1 = 2 and k2 = 0 at the time of PAL. 7. The digital bus line input / output terminal is connected to the first digital bus line input / output terminal and the second digital bus line input / output terminal to form one digital bus line input / output terminal. 7. The signal conversion device according to any one of 6.