JP2002232379A - MPEG2 transport stream multiplexer - Google Patents

Abstract

(57) [Problem] To provide a transport stream multiplexing apparatus capable of rewriting data contents without multiplexing a PID when multiplexing and transmitting an MPEG2 transport stream. A FIFO holding an input MPEG-2 transport stream has a capacity larger than necessary for holding the same, and a selection signal of rewrite data from an additional information output unit is synchronized with the stream data as FIFO information. And write, FIF corresponding to additional information
Based on the output of O, data having the same data structure as the transport stream output from the rewrite data output means 5 is selected by the first selector 8 by the output of the selection signal generation means 7, and the rewrite position of the transport stream is permitted to be rewritten. The rewriting data detected by the signal generation means 6 and controlled by the second selector 9 is output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a plurality of input M
M for multiplexing PEG2 transport stream data
The present invention relates to a PEG2 transport stream multiplexer.

[0002]

2. Description of the Related Art In recent years, digital communication and digital broadcasting systems for transmitting multi-channel, multi-program video signals by applying moving image compression technology have attracted attention. Moving image compression used for such applications As a technology,
MPEG2 is the current mainstream. The MPEG2 standard is
It is an international standard for video compression, audio compression, and multimedia multiplexing standardized by ISO (International Organization for Standardization) / IEC (International Electrotechnical Commission). As described above, this MPEG2 standard includes compression of video and audio signals,
Some standards multiplex the signals generated by these compressions.

The standard for this multiplexing is generally MPEG2.
The system is called ISO / IEC standard No. 1
No. 3818-1. This MPEG
The two systems include two multiplexing schemes: an MPEG2 program stream (PS) scheme and an MPEG2 transport stream (TS) scheme.

[0004] The MPEG2 program stream system is a system that defines a function of multiplexing each stream in which a video signal and an audio signal constituting a single video program are individually compressed. The MPEG2 program stream system has a function of multiplexing each stream in which a program such as a video signal and an audio signal, which constitute one video program, is individually compressed, and also has a function of multiplexing a plurality of video programs. . In this system, compressed video / audio signals are called transport packets in FIG.
Are divided into 188-byte fixed-length packets. In Japanese digital broadcasting, 204 bytes is one packet length to further provide data redundancy. The 188 bytes have a packet structure similar to that shown in FIG.

A video signal transmission system for transmitting a multi-channel, multi-program video program by multiplexing a plurality of video programs using the MPEG2 transport stream system is mainly a broadcasting system using terrestrial waves and satellites. Is being actively developed. In these systems, a plurality of programs are multiplexed by the MPEG2-TS system to provide a broadcasting service. Each transport packet has 13-bit width packet identification information (hereinafter abbreviated as PID) for distinguishing each transport packet, and a different PID is assigned to each packet according to its type.

Further, between each transport packet,
Actually, as the timing information for synchronizing programs such as video and audio, SCR in a program stream representing a reference time, a time reference signal (time information) called PCR in a transport stream, DTS representing decoding start time information, and display. PTS (Presenta) indicating start time information
tion Time Stamp). Note that DTS is information provided only when it is different from PTS.
Are the same, only the PTS is given. The time measurement is performed by providing a counter in the decoding device, loading the SCR into the counter, and counting up a 27 MHz reference clock. In addition, when multiplexing MPEG2-TS, it is necessary to increase the PCR value, which is the time information corresponding to the delay time generated when multiplexing.

In Japan's domestic terrestrial digital broadcasting, an OFDM (Orthogonal Frequency Division Multiplexing) transmission method is used. Further, the entire band is divided into a maximum of three OFDM blocks, and a modulation method is applied to each block. Are performed with different hierarchical modulation. A frame is created from a large number of OFDM symbols, and the data transmission capacity in each layer is uniquely determined by the modulation method and the bandwidth, and the transmission data amount for each layer is defined in frame units. Therefore, data such as video and audio to be transmitted must be small in advance with respect to the transmission capacity of each layer, and a NULL packet (hereinafter also referred to as a null packet; (TS packet having no valid data in the payload in FIG. 14).

[0008]

In the above-described multiplexing of the MPEG2 transport stream in the conventional multiplexing method, there is a packet having a PID which is not transmitted in the MPEG2 transport stream as an input signal. To change the data of the MPEG2 transport stream
When outputting as a stream, one function is provided for each input unit to decode the PID (the operation of determining or identifying the PID, the same applies hereinafter) in order to determine whether or not to send the stream.
There is a problem that a total of two or more functions or means, one PID decoder necessary for discriminating the MPEG-2 transport stream to be rewritten, is required at the output part, which leads to an increase in circuit scale.

Also, there is a packet having a PID not to be transmitted in the MPEG2 transport stream which is an input signal, and a PC caused by a delay generated when multiplexing is performed.
R is added to the PCR at the input of the MPEG2 transport stream of each program, and
When outputting two transport streams, one function is provided for each input to decode the PID in order to determine whether or not to transmit, and the PCR is allowed to operate on a different time basis for each program. MPE entered
For a G2 transport stream, a PID decoder required to output a PCR for each input is required at the output unit, and a total of two or more functions or means are required, resulting in an increase in circuit size. There was a problem.

Furthermore, PCR generated at the same reference time
In the case where the MPEG2 transport stream having the above is an input signal, even if the PID is different, the PCR of the input destination (output source of the input signal) outputs a PCR calculation value based on the same time reference. However, there is a problem in that a multiplexing unit for transmitting an output signal needs to detect a packet by a PID decoder.

In addition, when hierarchical modulation is performed, the transmitted NULL packet is used only for adjusting the transmission capacity, so that unnecessary information is transmitted. It is conceivable to rewrite to another MPEG2 transport stream at the input stage, but in this case, since the bit rates of the respective inputs are different, they are not always transmitted in the rewritten order, and the temporal transmission order is maintained. Need MPEG
In order to rewrite the two transport streams, there is a problem that it is necessary to manage the bit rate of each input.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. In a multiplexing operation, MID decoding is performed without performing PID decoding that would increase the circuit scale.
It is possible to rewrite part or all of the data in the PEG2 transport stream, and when an MPEG2 transport stream having a PCR generated at the same reference time is an input signal, P
The PCR can be rewritten without decoding the ID, and when a NULL packet is input, the PID is not decoded in the multiplexing operation.
It is an object of the present invention to provide an MPEG2 transport stream multiplexing apparatus capable of rewriting an entire MPEG2 transport stream into an MPEG2 transport stream having valid data and changing the stream.

[0013]

SUMMARY OF THE INVENTION MPEG in the present invention
The two-transport stream multiplexer receives an MPEG2 transport stream including one or more programs as an input signal in synchronization with an input clock, multiplexes the input signal, synchronizes with an output clock, and multiplexes the multiplexed MPEG-2 stream. A multiplexing device that outputs a transport stream, an additional information output unit that outputs additional information related to the input signal in synchronization with the input signal, a first-in first-out unit that first-in-first-out the additional information and the input signal, An input / output control unit for generating a read signal for reading the first-in first-out unit in synchronization with the output clock, and generating a write signal for the first-in-first-out unit in synchronization with an input clock; and outputting rewrite data for rewriting the input signal data. Rewriting data output means for performing Selection signal generation means for generating a selection signal for selecting rewrite data corresponding to the additional information included in the output of the output means; first selector for selecting rewrite data of the rewrite data output means in accordance with the selection signal; A rewriting permission signal generating means for detecting a data position to be rewritten in the signal data and outputting a rewriting permission signal; and input signal data output from the first-in first-out means based on the rewriting permission signal, being output from the first selector. And a second selector for switching to the rewrite data. With this configuration, the additional information is transmitted in synchronization with the input transport stream data, so that the output multiplexing unit does not decode the PID, and the content of the stream data based on the specific information of the input signal. To be rewritten.

The MPEG2 transport stream multiplexing apparatus according to the present invention is an
Inputting the EG2 transport stream as an input signal in synchronization with an input clock, multiplexing the input signal,
A multiplexing device for outputting a multiplexed MPEG-2 transport stream in synchronization with an output clock, wherein first and second additional information are respectively supplied to different inputs of first-in first-out means in synchronization with the input signal. A first-in first-out means for outputting the first and second additional information and the input signal data on a first-in first-out basis, and a read signal for reading the first-in first-out means in synchronization with the output clock; Input / output control means for synchronously generating a write signal of the first-in first-out means, rewrite data output means for outputting rewrite data to be rewritten for the input signal data, and first additional information output from the first-in first-out means. Selection signal generating means for generating a selection signal of rewrite data by A first selector for selecting the rewriting data of the rewrite data output unit by the selection information,
Rewriting permission signal generating means for outputting a rewriting permission signal from the second additional information output from the first-in first-out means; and input signal data output from the first-in first-out means based on the rewriting permission signal being output from the first selector. And a second selector for switching to the rewrite data. With this configuration,
By transmitting the position information of the transport stream data to be rewritten as additional information, the output multiplexing means can rewrite the contents of the stream data based on the additional information without decoding the PID.

The MPEG2 transport stream multiplexing device according to the present invention is an
Inputting the EG2 transport stream as an input signal in synchronization with an input clock, multiplexing the input signal,
A multiplexing device that outputs a multiplexed MPEG2 transport stream in synchronization with an output clock, and outputs a first additional information and a second additional information in that order in synchronization with the input signal. Means, the first
A first-in first-out means for first-in first-out of the second additional information and the input signal data; a read signal for reading the first-in first-out means in synchronization with the output clock; and a write signal in the first-in first-out means in synchronization with the input clock. Input / output control means for outputting, rewrite data output means for outputting rewrite data to rewrite the input signal data, additional information holding means for holding the output of the first-in first-out means corresponding to the first additional information; Timing control means for controlling a timing signal for holding the first additional information in the information holding means;
From the beginning of the input transport stream, the first
Additional information detection means for outputting an additional information detection signal indicating until the end of the additional information, selection signal generation means for generating a rewrite data selection signal from the output of the additional information holding means, and the rewrite data A first selector for selecting rewrite data of the output means, a rewrite permission signal generating means for outputting a rewrite permission signal based on second additional information from the first-in first-out means and an additional information detection signal from the additional information detection means, A second selector configured to switch input signal data output from the first-in first-out means based on the rewrite permission signal to rewrite data output from the first selector. With this configuration, by transmitting the position information of the stream data to be rewritten as additional information together with the transmission of a plurality of pieces of additional information, the output multiplexing unit does not decode the PID and decodes the stream data based on the additional information. To be able to rewrite the contents of

[0016] In the MPEG2 transport stream multiplexing apparatus according to the present invention, the input signal is an MPEG2 transport stream in which PCR is multiplexed, and a PCR detecting means for detecting a PCR value of an input signal for each input; A PCR calculating means for adding a delay time between input and output of the transport stream multiplexer to the detected PCR value and outputting the rewritten data as a PCR, and a second PCR for detecting the PCR of the input transport stream. And a rewrite permission signal generating means for generating a PCR position detection signal indicating the position of the PCR by the PCR detection means, and outputting the PCR position detection signal as a rewrite permission signal. With this configuration, the output multiplexing unit can change the PCR for the input of the MPEG2 transport stream multiplexed based on one time reference without decoding the PID.

In the MPEG2 transport stream multiplexing apparatus according to the present invention, the input signal is an MPEG2 transport stream in which PCR is multiplexed, and the PCR detecting means detects the PCR in the input signal and synchronizes the input signal with the PCR when detecting the PCR. A PCR position detection signal is output to information output means, and the additional information output means outputs first additional information indicating an input destination of the input signal, and a second additional information is synchronized with the PCR position detection signal. Information is output, the PCR calculating means is selected based on the first additional information, and a position at which the PCR from the PCR calculating means is rewritten is selected based on the second additional information. With this configuration, it is possible to change the PCR for the input of the MPEG-2 transport stream multiplexed on one time reference without decoding the PID at the output stage and without detecting the position of the PCR by the multiplexing means. To

The MPEG-2 transport stream multiplexing apparatus according to the present invention comprises two MPEG-2
4. The transport stream multiplexing device according to claim 1, further comprising a transport stream multiplexing device, wherein the preceding MPEG2 transport stream multiplexing device is a transport stream multiplexing device for outputting a rewriting permission signal. A selection signal generating means for outputting a selection signal; a first selector for selecting and outputting rewrite data under the control of the subsequent MPEG2 transport stream multiplexer;
4. A first-in first-out means for outputting a transport stream to the subsequent MPEG2 transport stream multiplexer, wherein the latter MPEG2 transport stream multiplexer is the transport stream multiplexer according to claim 2 or 3. Previous MP
The input destination information of the subsequent MPEG2 transport stream multiplexer is output as additional information together with the rewrite permission signal and the selection signal from the EG2 transport stream multiplexer, and the MP from the preceding first-in first-out means is output.
Additional information output means for inputting an EG2 transport stream, a first selector for selecting rewrite data output from the first selector in the preceding stage,
It has a configuration including a selector and a selection signal generating means for generating a control signal for controlling selection of rewrite data in the first selector at the subsequent stage. With this configuration, the transport stream multiplexed by the preceding MPEG2 transport stream multiplexing device is further multiplexed in the subsequent stage, so that the PID is applied to the multi-input of the multiplexed MPEG2 transport stream
Of the stream data can be rewritten without performing decoding at the output stage and without detecting the position of the rewritten data by the multiplexing means.

The MPEG-2 transport stream multiplexing apparatus according to the present invention comprises one or more MPEG-2
2 transport stream multiplexing device, wherein the preceding MPEG2 transport stream multiplexing device comprises:
A PCR detecting means functioning as a PCR position detecting means for inputting an MPEG2 transport stream in which PCR is multiplexed as an input signal to one or more inputs and detecting a PCR of the input signal for each of the inputs; PCR calculating means for adding the delay time between the input and output of the transport stream multiplexing device and outputting the rewritten data as PCR,
Selection signal generating means for outputting a selection signal indicating an input destination of the EG2 transport stream; and an output of each of the PCR calculation means is selected by a selection signal from the MPEG2 transport stream multiplexer at the subsequent stage, and the MPEG2 transport stream at the latter stage is selected. 6. The transport stream multiplexing apparatus according to claim 4, further comprising a first selector for outputting to the port stream multiplexing apparatus, wherein the subsequent MPEG2 transport stream multiplexing apparatus is the transport stream multiplexing apparatus according to claim 4 or 5. An additional information output means for outputting, as additional information, a selection signal indicating an input destination from the device and input destination information of the subsequent MPEG2 transport stream multiplexing device;
Selection signal generating means for generating a selection signal for controlling selection of the PCR rewrite data by the first selector of the EG2 transport stream multiplexer; and selecting the PCR rewrite data output from the previous-stage selector by the selection signal. And a first selector for outputting. According to this configuration, by further multiplexing the MPEG2 transport stream in which a plurality of transport streams are multiplexed, the PID can be further decoded without performing the PID decoding in the previous output stage.
Position detection at the subsequent output stage without using the PCR
Allows for changes.

In the MPEG2 transport stream multiplexing apparatus according to the present invention, the additional information output means may be an MPE
Delay holding means for holding and delaying the input data of the G2 transport stream for the time from the beginning until the PID arrives, and a PID for detecting the PID of the input data
Detecting means; null determining means for outputting a null detection signal as additional information when a null packet is detected by the detected PID; and a rewriting permission signal for permitting rewriting of the input MPEG2 transport stream from the beginning to the end of the packet. And a rewriting permission signal generating means for outputting the rewriting data and converting the rewriting data into a completely different MPEG2 transport stream. With this configuration, by detecting a null packet and inserting rewrite data into the null packet, the rewritten MPEG can be decoded without performing PID decoding by a multiplexing means.
Thus, two transport streams can be transmitted.

In the MPEG2 transport stream multiplexing apparatus according to the present invention, the additional information output means may be an MPE.
Delay holding means for holding and delaying the input data of the G2 transport stream for the time from the beginning until the PID arrives, and a PID for detecting the PID of the input data
Detecting means for outputting a null detection signal as first additional information when a null packet is detected by the detected PID, and outputting the second additional information as a position from the beginning to the end of the transport stream packet to be input to the first-in first-out means; A null determination unit for outputting information, and a rewrite permission signal generation unit for generating a rewrite permission signal based on the position information from the beginning to the end and converting the rewrite data into a completely different MPEG2 transport stream. Have. With this configuration, the PID
Without decoding at the output stage and without managing the packet length and packet head.
It can be rewritten to the EG2 transport stream.

The MPEG2 transport stream multiplexing apparatus according to the present invention comprises one or more MPEG-2
2 transport stream multiplexing device, wherein the preceding MPEG2 transport stream multiplexing device comprises:
9. The transport stream multiplexer according to claim 7, further comprising a null packet discrimination signal output unit that indicates that the MPEG-2 transport stream being transmitted is a null packet. And the MP of the preceding stage
It has a configuration in which additional information output means for inputting a null packet discrimination signal from the EG2 transport stream multiplexing device and outputting it as additional information is provided. With this configuration, by further multiplexing the MPEG2 transport stream obtained by multiplexing a plurality of streams,
The ID can be rewritten to another MPEG2 transport stream without decoding the ID at the subsequent output stage and without managing the packet length and the head of the packet.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first to tenth embodiments of the present invention will be described in detail with reference to the accompanying drawings. (First Embodiment) First, an MPEG2 transport stream multiplexing apparatus according to a first embodiment of the present invention will be described with reference to FIG.

Referring to FIG. 1, an MPEG2 transport stream multiplexing apparatus according to a first embodiment of the present invention has an MPE including at least one or more programs.
A G2 transport stream (hereinafter, also simply referred to as a transport stream) 1 as an input signal, additional information output means 2 for outputting additional information related to the input signal in synchronization with the input signal, and an input signal and additional information. It has an input system consisting of a FIFO (first-in first-out means, the same applies hereinafter) 3 to be held, and multiplexing method information from the input side;
FI for controlling FIFO 3 by generating a control signal for input / output of FIFO 3 from an output synchronization clock and an input synchronization clock
The FO input / output control unit 4 generates a signal for selecting rewrite data (for example, any data among other data constituting a transport stream, such as a PCR value) from information corresponding to the additional information of the FIFO 3. Selection signal generation means 7, rewrite data output means 5 for outputting rewrite data, first selector 8 for switching and outputting the outputs of a plurality of rewrite data output means 5 according to the selection signal, and a structure based on the structure of the transport stream. A rewrite permission signal generating means 6 for detecting the position of data in the transport stream to be rewritten, and a second selector 9 for switching between the output of the first selector 8 and the output of the FIFO 3 according to the rewrite permission signal.

Next, with reference to FIG. 1, more detailed functions and operations of each of the above components will be described. An MPEG2 transport stream multiplexing device according to the present embodiment is a MPE including at least one or more programs.
G2 transport stream 1 is used as an input signal, and has a packet structure as shown in FIG. This transport stream packet (hereinafter, also simply referred to as a packet) operates in accordance with a predetermined rule so that a plurality of packets having the same structure are multiplexed and output at the output.
In this embodiment, the case where the input system is 2 is shown.
It may have more than two input systems.

The additional information output means 2 outputs data necessary for rewriting the transport stream (for example, a request for rewriting, data indicating the position of the data of the transport stream to be rewritten, and so forth).
Synchronize with PEG2 transport stream and FIFO
Output to 3. The input / output control means 4 of the FIFO 3 outputs the write signal of the FIFO 3 synchronized with the input bit rate and the FIFO from which the data is to be output at the time of multiple inputs according to a multiplexing method such as a time division multiplexing method. And outputs a read signal synchronized with the bit rate.

The rewrite data output means 5 has the same information data array as the data at the position in the transport stream indicated by the rewrite permission signal, and outputs data that has been changed in a predetermined manner. FIFO3 has a data width of the MPEG2 transport stream, here 8 bits, and data input / output exceeding this data width, here 11
It has bits. Here, the selection signal generation means 7 generates a selection signal of rewrite data by a FIFO output corresponding to the 3-bit width additional information. Here, the first selector 8 can select, from the output of the rewrite data output means 5, a maximum of eight pieces of rewrite data, which are 3-bit data.

The rewrite permission signal generating means 6 analyzes the structure of the transport stream and generates a rewrite permission signal indicating which data in the transport stream is to be rewritten. This rewrite permission signal indicates a position in the transport stream corresponding to each data. The second selector 9 selects and outputs the data selected by the first selector 8 when the rewrite permission signal is input, and otherwise selects and outputs the output of the FIFO 3 corresponding to the data of the transport stream. .

Since the original data for selecting the rewrite data is input to the FIFO 3 in synchronization with the input MPEG2 transport stream, the PID is decoded at the output stage without discriminating the MPEG2 transport stream. And rewrite of transport stream data.

Therefore, the MP of the first embodiment of the present invention
According to the EG2 transport stream multiplexer,
Data to be rewritten can be output from the rewrite data output means, the rewrite data can be selected based on the data from the additional information output means, and rewritten with any data in the transport stream data and output.

(Second Embodiment) Next, an MPEG2 transport stream multiplexing apparatus according to a second embodiment of the present invention will be described with reference to FIG. FIG.
In the second embodiment, the MPEG according to the second embodiment of the present invention
The two transport stream multiplexers have at least one
MPEG2 transport stream 1 including a plurality of programs as an input signal, and additional information output means for outputting additional information relating to the input signal and additional information indicating a rewrite position in the transport stream in synchronization with the input signal 2 and FIF holding input signal and additional information
A FIFO input / output control means 4 for controlling the input / output of the FIFO 3 based on multiplexing method information from the input side, an output synchronization clock, and an input synchronization clock, and an input signal of the FIFO 3 Selection signal generation means 7 for generating a signal for selecting rewrite data based on the output of FIFO 3 corresponding to the related additional information, and first selector 8 for switching and outputting the outputs of a plurality of rewrite data output means 5 according to the selection signal And rewrite data output means 5 for outputting the rewrite data selected by the first selector 8; and a data position in the transport stream to be rewritten from the output of the FIFO 3 corresponding to the additional information indicating the rewrite position in the transport stream. The rewriting permission signal generating means 6 for detecting and controlling the rewriting permission signal Switch or example data or input data constituted by the second selector 9 to be output.

Next, the operation of the MPEG2 transport stream multiplexing apparatus according to the present embodiment will be described with reference to FIG. The additional information output unit 2 outputs data necessary for rewriting the transport stream as first additional information. In the case of the present embodiment, three bits out of four bits are used as first additional information data as additional information. The second additional information is written in one of the four bits that does not transmit the first additional information. The second additional information is information indicating a rewrite position for generating a rewrite permission signal. Is generated based on the structure of the transport stream data. The output of the FIFO 3 corresponding to the first additional information is input to the selection signal generating means 7 as in FIG. Also, the FI corresponding to the second additional information
Output of the additional information of FO3 is performed by
Input. Other operations are the same as those of the first embodiment.

Therefore, according to the MPEG-2 transport stream multiplexing apparatus according to the second embodiment of the present invention, since the information of the rewriting position is also synchronized with the transport stream data of the FIFO 3, the detection of the rewriting position is performed at the output stage. It is possible to rewrite the transport stream data without performing the above.

(Third Embodiment) Next, an MPEG2 transport stream multiplexing apparatus according to a third embodiment of the present invention will be described with reference to FIG. FIG.
In the third embodiment, the MPEG according to the third embodiment of the present invention
The two transport stream multiplexers have at least one
The MPEG2 transport stream 1 including the plurality of programs is used as an input signal, and additional information related to the input signal and additional information indicating a rewrite position in the transport stream are converted into additional information related to the input signal.
Additional information output means 2 for outputting the additional information indicating the rewrite position in the transport stream in a time-division manner in the order of additional information,
FIFO input / output control means for controlling an input / output of the FIFO 3 based on a multiplexing method information from the input side, an output synchronization clock, and an input synchronization clock based on an input system including an input signal and a FIFO 3 for holding additional information. 4 and FIF
Additional information holding means 10 for holding additional information related to the input signal of O3, timing control means 9 for generating a timing signal for holding the additional information in the additional information holding means 10 based on the structure of the transport stream; After the arrival of the data related to the signal, the additional information detecting means 12 which determines from the structure of the transport stream that the additional information indicating the rewrite position in the transport stream is valid, and the output of the additional information holding means 10 Selection signal generating means 7 for generating a signal for selecting rewrite data
A first selector 8 for selecting rewrite data in accordance with a selection signal, a rewrite data output means 5 for outputting rewrite data selected by the first selector 8, and additional information indicating a rewrite position in the transport stream. The rewriting permission signal generation means 6 detects the position of data in the transport stream to be rewritten from the output of the FIFO 3, and the second selector 9 selects the output of the first selector 8 or the input data based on the rewriting permission signal. You.

Next, the operation of the MPEG-2 transport stream multiplexing apparatus according to the present embodiment will be described with reference to FIG. The additional information output means 2 outputs some data relating to rewriting of the transport stream as first additional information. They form at least one or more data streams (data streams) and have information in one data stream. In this example, it is assumed that one piece of information is composed of 6 bits, and writing to FIFO3 twice is performed as follows.
One piece of information is transmitted. FIFO of additional information
In this case, the timing for holding the three outputs twice every three bits is detected from the position in the transport stream by the timing control means 11 based on the structure of the transport stream, and is held by the additional information holding means 10.

Further, as the second additional information, additional information which becomes the same data as the rewrite permission signal is output after the first additional information is output, in synchronization with the writing of the input transport stream data. Additional information detecting means 1
In step 2, an additional information detection signal indicating the end of the input of the first additional information is output based on the structure in the transport stream data including the first additional information. The rewriting permission signal generating means 6 receives the additional information detection signal and
It is determined that the additional information is valid. The output of the additional information holding unit 10 is input to the rewrite data selection signal generation unit 7 and serves as a control signal of the first selector 8 for selecting the rewrite data. After the first additional information arrives from the additional information detection signal, the rewrite permission signal
3 enables the output of the second additional information, and generates a rewrite permission signal. Rewriting position information is also FIFO3
, The transport stream data can be rewritten without detecting the rewrite position by the second selector 9 at the output stage.

The additional information detecting means 2 can also send data indicating the end in the additional information, and generate an additional information detection signal based on the data. Further, the timing held by the first additional information can be transmitted as the additional information.

(Fourth Embodiment) Next, an MPEG2 transport stream multiplexing apparatus according to a fourth embodiment of the present invention will be described with reference to FIG. FIG.
In the fourth embodiment, the MPEG according to the fourth embodiment of the present invention
The two transport stream multiplexers have at least one
MPEG2 transport stream 1 including a plurality of programs as an input signal, additional information output means 2 for outputting additional information indicating the input destination of the input signal in synchronization with the input signal, and holding the input signal and the additional information FIFO to do
And a FIFO input / output control means 4 for controlling the input / output of the FIFO 3 based on the multiplexing method information from the input side, the output synchronization clock, and the input synchronization clock, and additional information of the FIFO 3 Selection signal generating means 7 for generating a signal for selecting rewrite data based on corresponding information; PCR detecting means 13 for detecting PCR of each input signal; and PCR for adding a time delay in a multiplexing operation from the detected PCR value. A rewrite data output means 5 comprising a calculation means 14, a first selector 8 for selecting rewrite data according to a selection signal, and a second PCR detection means 19 for detecting a PCR of the input transport stream; Based on the structure of the transport stream, the P
A rewrite permission signal generating means 6 for detecting the position of the CR data and outputting a rewrite permission signal, and a second means for selecting whether the output of the first selector 8 or the input data is based on the rewrite permission signal.
And a selector 9.

Next, the operation of the MPEG2 transport stream multiplexing apparatus according to the present embodiment will be described with reference to FIG. Numbers 0 to 1 are assigned to the input destinations of multiple inputs (two inputs in this example), and the additional information output means 2 outputs data 0 to 1 indicating the input destination of the input signal as additional information. Since the additional information indicates 0 or 1, 1 bit is sufficient for the additional information. The input signal is P
CR is an MPEG2 transport stream multiplexed by one time reference. The PCR detection means 13 detects a PCR value for each input based on the structure of the input transport stream. Further, the PCR calculating means 14 calculates a new PCR value by increasing the delay time between the input and output of the multiplexing device from the detected PCR value. These PCR values are obtained for each input.

The calculated PCR value is output to the first selector 8. Since one input is connected to an MPEG2 transport stream in which PCR is multiplexed by one time reference, the input transport stream PC
The R value changes on the same time reference if the input destination is the same, without depending on the transport stream data. That is, when the input destination is determined, the PCR value is determined. The rewrite permission signal generation means 6 is provided with a second PCR detection means 19, and outputs a PCR position detection signal as a rewrite permission signal. The data input to the selection signal generation means 7 indicates the input destination, and the output of the selection signal generation means 7 controls the first selector 8 so as to select the PCR corresponding to each input destination. Therefore, the first
By using the changed PCR output from the selector 8 as the rewrite data, the PCR can be changed.

(Fifth Embodiment) Next, an MPEG2 transport stream multiplexing apparatus according to a fifth embodiment of the present invention will be described with reference to FIG. FIG.
In the fifth embodiment, the MPEG according to the fifth embodiment of the present invention
The two transport stream multiplexers have at least one
The MPEG2 transport stream 1 including the above-described plurality of programs is used as an input signal, additional information indicating an input destination of the input signal, and a PCR in the transport stream.
Additional information output means 2 for outputting the additional information indicating the position of the input signal in synchronization with the input signal, and F for holding the input signal and the additional information.
A FIFO input / output control means 4 for controlling the input / output of the FIFO 3 based on the multiplexing method information from the input side, the output synchronization clock, and the input synchronization clock, and the additional information of the FIFO 3 Selection signal generation means 7 for generating a signal for selecting rewrite data based on the corresponding information, first selector 8 for selecting rewrite data according to the selection signal, and PCR detection means 13 for detecting PCR for each input. Rewriting data output means 5 comprising PCR calculating means 14 for adding a time delay in the multiplexing operation of second selector 9 from the PCR value, and first selector 8 for selecting rewriting data based on the selection signal
And a rewrite permission signal generating means 6 for generating a rewrite permission signal based on the additional information indicating the position of the PCR, and a second selector 9 controlled by the rewrite permission signal.

Next, the operation of the MPEG2 transport stream multiplexing apparatus according to the present embodiment will be described with reference to FIG. A PCR detection means 13 is provided which functions as a PCR position detection means for outputting a PCR position detection signal for each MPEG2 transport stream of an input signal.
The information is output as second additional information in synchronization with the R data, and data indicating the input destination of the input signal is transmitted as first additional information prior to the PCR position detection signal. P which functions as rewrite data output means 5 based on the first additional information
The output of the CR calculation means 14 is selected by the first selector 8.
The rewrite permission signal generating means 6 outputs a rewrite permission signal at a rewrite position in the transport stream based on the second additional information.
By selecting the output of (1), in the final multiplexing step, it is possible to rewrite the PCR without having to decode the PID for identifying the transport stream.

(Sixth Embodiment) Next, FIG.
With reference to FIG. 7 and FIG. 7 (later stage), an MPEG2 transport stream multiplexing apparatus according to a sixth embodiment of the present invention will be described. Each MPEG2 in the former stage shown in FIG.
The transport stream multiplexing apparatus includes a rewrite permission signal generating means 6 for outputting a rewrite permission signal and a selection signal generating means 7 for outputting a selection information signal to the MPEG2 transport stream multiplexing apparatus according to the first embodiment. The MPEG-2 transport stream multiplexing device shown in FIG. 7 is a MPE in the second embodiment.
The additional information output unit 2 of the G2 transport stream multiplexer outputs the rewrite permission signal and the selection information signal input from the preceding MPEG2 transport stream multiplexer shown in FIG. 6 and the input destination information of the subsequent MPEG2 transport stream multiplexer. Are provided as additional information to form an MPEG2 transport stream multiplexing device.

The selection signal generating means 7 at the subsequent stage outputs the MP signal at the previous stage.
The control signal of the first selector 8 of the EG2 transport stream multiplexer is generated from the additional data added based on the selection information of the previous stage, and the control signal of the first selector 8 of the subsequent stage is added from the information of the input destination of the subsequent stage. Generated from the additional information.

The rewrite data output of the first selector 8 of the preceding MPEG2 transport stream multiplexer is used as the rewrite data of the subsequent MPEG2 transport stream multiplexer, and the transport stream data is changed. Without decoding the PID identifying the port stream,
The transport stream data can be rewritten.

(Seventh Embodiment) Next, FIG. 8 (previous stage)
An MPEG2 transport stream multiplexing device according to the seventh embodiment of the present invention will be described with reference to FIG. Each MPEG2 in the preceding stage shown in FIG.
The transport stream multiplexing apparatus is provided with a rewriting permission signal generating means 6 for outputting a rewriting permission signal and a selection signal generating means 7 for outputting a selection information signal to the MPEG2 transport stream multiplexing apparatus according to the fourth embodiment. The MPEG-2 transport stream multiplexing device at the subsequent stage shown in FIG.
The rewriting permission signal and the selection information signal input from the preceding MPEG2 transport stream multiplexer shown in FIG. 8 and the input destination information of the subsequent MPEG2 transport stream multiplexer are supplied to the additional information output means 2 of the G2 transport stream multiplexer. Are provided as additional information to form an MPEG2 transport stream multiplexing device.

The subsequent-stage selection signal generation means 7 outputs the signal to the MP
The control signal of the first selector 8 of the EG2 transport stream multiplexer is generated from the additional data added based on the selection information of the previous stage, and the control signal of the first selector 8 of the subsequent stage is added from the information of the input destination of the subsequent stage. Generated from the additional information. By using the PCR calculated value of the PCR calculating means 14 output from the first selector 8 of the first stage MPEG2 transport stream multiplexer as the rewrite data of the second stage MPEG2 transport stream multiplexer, the transport stream in the final multiplexing stage is obtained. P to identify
The PCR can be changed without decoding the ID.

(Eighth Embodiment) Next, an MPEG2 transport stream multiplexing apparatus according to an eighth embodiment of the present invention will be described with reference to FIG. In FIG. 10, the MP according to the eighth embodiment of the present invention
The EG2 transport stream multiplexing device holds the delay in the additional information output means 2 of the MPEG2 transport stream multiplexing device according to the first embodiment for holding and delaying the input data of the MPEG2 transport stream by the time that the PID arrives. Means 15, a PID detecting means 16 for detecting a NULL packet by the PID,
When a NULL packet is detected, NU is used as additional information.
Null determination means 17 for outputting an LL detection signal is provided.

Next, the operation of the MPEG-2 transport stream multiplexing apparatus according to the present embodiment will be described with reference to FIG. The delay holding unit 15 holds input data for the time when the PID arrives, and does not output the data to the FIFO 3 until the PID is determined. The NULL judgment 17 outputs a NULL detection signal as additional information when the MPEG2 transport stream input from the output of the PID detection means 16 is a NULL packet. The rewrite permission signal generating means 6 outputs the rewrite permission signal from the beginning to the end of the NULL packet in accordance with the output of the additional information from the FIFO 3 corresponding to the NULL detection signal, and controls the first selector 8 and the second selector 9. Accordingly, the output can be changed to completely different MPEG2 transport stream data without decoding the PID for identifying the transport stream in the final multiplexing stage.

As the additional information, it is possible to write some information on the input together with the NULL detection signal into the FIFO 3, control the first selector, and select an MPEG-2 transport stream having a large number of completely different data.

(Ninth Embodiment) Next, an MPEG2 transport stream multiplexing apparatus according to a ninth embodiment of the present invention will be described with reference to FIG. In FIG. 11, MP in the ninth embodiment of the present invention
The EG2 transport stream multiplexer holds and delays the input data of the MPEG2 transport stream by the additional information output means 2 of the MPEG2 transport stream multiplexer in the second embodiment for at least the time that the PID arrives. Delay holding means 15 and PI
D detection means 16 and NULL determination means 17 for detecting NULL packets by PID.

Next, the operation of the MPEG-2 transport stream multiplexing apparatus according to the present embodiment will be described with reference to FIG. In the additional information output means 2, the PID
The PID detected by the detection means 16 is NULL determination means 17
If it is determined that the packet is a NULL packet, a NULL detection signal is output as the second additional information for the entire packet length. Also, a plurality of Ms to be rewritten are used as the first additional information.
Information for selecting which MPEG2 transport stream data is rewritten from the PEG2 transport stream data is transmitted in advance before transmitting the transport stream data, and the first selector 8 is controlled.

Based on the rewrite permission signal generated by the rewrite permission signal generating means 6 based on the second additional information, the second
By controlling the selector 9, the output data can be changed to completely different MPEG2 transport stream data without decoding the PID for identifying the transport stream at the final multiplexing stage.

(Tenth Embodiment) Next, a tenth embodiment of the present invention will be described with reference to FIGS.
An MPEG2 transport stream multiplexing device according to the embodiment will be described. M shown in FIG.
The PEG2 transport stream multiplexing device 18 outputs a NULL MPEG2 transport stream.
13 has an output means for outputting a NULL packet discrimination signal indicating that the packet is a packet.
The two-transport-stream multiplexing device inputs a NULL packet discrimination signal from the preceding MPEG2 transport-stream multiplexing device to the additional information output means 2 as preceding-stage additional information, and further adds information relating to the input signal thereto. Is added.

By controlling the first and second selectors 8 and 9 in the subsequent stage based on the additional information in the preceding stage, in the final multiplexing stage, a completely different MPEG-2 format can be used without decoding the PID for identifying the transport stream.
It can be changed to output transport stream data.

[0056]

The MPEG2 transport stream multiplexing apparatus according to the present invention is constructed as described above. In particular, the additional information for selecting the rewrite data contains the input MP
By outputting the data in synchronization with the EG2 transport stream, a part or the whole of the data in the MPEG2 transport stream can be rewritten without decoding the PID in the multiplexing operation for outputting the transport stream data.

Furthermore, PCR generated at the same reference time
When the MPEG2 transport stream having the input signal is an input signal, the PID is not decoded in the multiplexing operation, and the PCR changed from the PCR in the input MPEG2 transport stream is used as the rewrite data, so that the MPEG2 transport stream is used. The PCR in the stream can be rewritten.

When transmitting a NULL packet,
Without decoding the PID in the multiplex operation, M
Rewrite the entire PEG2 transport stream,
By changing the NULL packet to an MPEG-2 transport stream packet having valid data, it is possible to use the transmission capacity without wasting a NULL packet.

[Brief description of the drawings]

FIG. 1 shows MPEG2 in a first embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a transport stream multiplexing device.

FIG. 2 shows MPEG2 according to a second embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a transport stream multiplexing device.

FIG. 3 shows MPEG2 in a third embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a transport stream multiplexing device.

FIG. 4 shows MPEG2 according to a fourth embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a transport stream multiplexing device.

FIG. 5 shows MPEG2 according to a fifth embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a transport stream multiplexing device.

FIG. 6 shows MPEG2 according to a sixth embodiment of the present invention.
Block diagram showing the configuration of the previous stage of the transport stream multiplexing device,

FIG. 7 shows MPEG2 according to a sixth embodiment of the present invention.
Block diagram showing the configuration of the subsequent stage of the transport stream multiplexer,

FIG. 8 shows MPEG2 according to a seventh embodiment of the present invention.
Block diagram showing the configuration of the previous stage of the transport stream multiplexing device,

FIG. 9 shows MPEG2 according to a seventh embodiment of the present invention.
Block diagram showing the configuration of the subsequent stage of the transport stream multiplexer,

FIG. 10 shows an MPEG according to an eighth embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a two-transport stream multiplexing device.

FIG. 11 shows MPEG in the ninth embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a two-transport stream multiplexing device.

FIG. 12 shows an MPE according to a tenth embodiment of the present invention.
FIG. 4 is a block diagram showing a configuration of a preceding stage of the G2 transport stream multiplexing device;

FIG. 13 shows an MPE according to a tenth embodiment of the present invention.
FIG. 4 is a block diagram showing the configuration of the subsequent stage of the G2 transport stream multiplexer.

FIG. 14 is a diagram showing the structure of an MPEG2 transport stream in a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 MPEG2 transport stream 2 Additional information output means 3 FIFO 4 FIFO input / output control means 5 Rewrite data output means 6 Rewrite permission signal generation means 7 Selection signal generation means 8 First selector 9 Second selector 10 Additional information holding means 11 Timing control Means 12 Additional information detecting means 13 PCR detecting means 14 PCR calculating means 15 Delay holding means 16 PID detecting means 17 NULL judging means 18 MPEG2 transport stream multiplexer with NULL detecting signal output 19 Second PCR detecting means

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Toshiro Otani 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture F-term in Matsushita Communication Industrial Co., Ltd. 5C059 KK06 MA00 RB02 RB10 RC00 SS06 UA01 UA10 UA37 UA38 5C063 AA01 AB07 AC01 CA23 CA36 DA07 DA13 DA20 5K028 AA07 CC05 DD01 DD02 EE03 KK01 KK32 MM08 MM12 MM16 NN31 SS26 5K047 AA16 AA18 CC02 CC08 DD02 GG02 JJ00 MM02 MM26

Claims (10)

[Claims] An MPEG2 transport stream including one or more programs is input as an input signal in synchronization with an input clock, the input signal is multiplexed, and the multiplexed MPEG2 transport stream is synchronized with an output clock. An additional information output means for outputting additional information related to the input signal in synchronization with the input signal; a first-in first-out means for first-in first-out of the additional information and the input signal; and the output clock. Input / output control means for generating a read signal for reading the first-in first-out means in synchronization with the input / output means, and generating a write signal for the first-in-first-out means in synchronization with an input clock; and rewriting data for outputting rewriting data for rewriting the input signal data. Output means, included in the output of said first in first out means Selection signal generation means for generating a selection signal for selecting rewrite data corresponding to additional information; a first selector for selecting rewrite data of the rewrite data output means in accordance with the selection signal; and data to be rewritten in the input signal data Rewriting permission signal generating means for detecting a position and outputting a rewriting permission signal; and a second selector for switching input signal data output from the first-in first-out means to rewriting data output from the first selector based on the rewriting permission signal. And an MPEG2 transport stream multiplexing device. 2. An MPEG2 transport stream including one or more programs is input as an input signal in synchronization with an input clock, the input signal is multiplexed, and the multiplexed MPEG2 transport stream is synchronized with an output clock. An additional information output means for outputting the first additional information and the second additional information to different inputs of the first-in first-out means, respectively, in synchronization with the input signal; First-in first-out means for first-in first-out of additional information and the input signal data; input / output control for generating a read signal for reading the first-in first-out means in synchronization with the output clock and generating a write signal for the first-in first-out means in synchronization with the input clock Means for outputting rewrite data for rewriting the input signal data. Rewriting data output means, selection signal generating means for generating a rewriting data selection signal corresponding to the first additional information output from the first-in first-out means, and selecting the rewriting data of the rewriting data output means according to the selection information. A first selector, a rewrite permission signal generating means for outputting a rewrite permission signal from the second additional information output from the first-in first-out means, and an input signal data output from the first-in first-out means based on the rewrite permission signal. A second selector for switching to rewrite data output from the selector. 3. An MPEG2 transport stream containing one or more programs is input as an input signal in synchronization with an input clock, the input signal is multiplexed, and the multiplexed MPEG2 transport stream is synchronized with an output clock. An additional information output means for outputting the first additional information and the second additional information in this order in synchronization with the input signal;
A first-in first-out means for first-in first-out of the additional information and the input signal data, an input / output for generating a read signal for reading the first-in first-out means in synchronization with the output clock, and generating a write signal for the first-in first-out means in synchronization with the input clock Control means, rewrite data output means for outputting rewrite data for rewriting the input signal data, additional information holding means for holding the output of the first-in first-out means corresponding to the first additional information, and the additional information holding means A timing control means for controlling a timing signal for holding the first additional information, and an additional information detection means for outputting an additional information detection signal indicating from the beginning of the input transport stream to the end of the first additional information. A selection signal for rewriting data from an output of the additional information holding means. Selection signal generation means for generating, a first selector for selecting rewrite data of the rewrite data output means according to the selection information, second additional information from the first-in first-out means, and an additional information detection signal from the additional information detection means And a second selector for switching input signal data output from the first-in first-out means to rewrite data output from the first selector based on the rewrite permission signal. An MPEG2 transport stream multiplexer. 4. The input signal is an MPE in which PCR is multiplexed.
A G2 transport stream, a PCR detecting means for detecting a PCR value of an input signal corresponding to each input, and a delay time between input and output of the transport stream multiplexing device with respect to the detected PCR value connected to the PCR detecting means. And a second PCR detecting means for detecting the PCR of the input transport stream, and
A PCR position detection signal indicating the position of the CR is generated.
2. The MPEG2 transport stream multiplexing apparatus according to claim 1, further comprising: a rewrite permission signal generating unit that outputs a CR position detection signal as a rewrite permission signal. 5. The input signal is an MPE in which PCR is multiplexed.
A G2 transport stream, wherein the PCR detection means outputs a PCR position detection signal to the additional information output means in synchronization with detection of the PCR in the input signal, and the additional information output means Outputting first additional information indicating an input destination, outputting second additional information in synchronization with the PCR position detection signal, selecting the PCR calculation unit based on the first additional information, 2 based on the additional information of P
5. The MPEG2 transport stream multiplexing device according to claim 4, wherein a position for rewriting the CR is selected. 6. An MPEG-2 transport stream multiplexing device comprising a first stage and a second stage, wherein said first stage MPEG-2
The transport stream multiplexing device according to claim 1, wherein the transport stream multiplexing device outputs a rewriting permission signal, a selection signal generating device that outputs a selection signal, A first selector for selecting and outputting rewritten data under the control of the latter-stage MPEG2 transport stream multiplexer, and a first-in first-out means for outputting an input MPEG2 transport stream to the latter-stage MPEG2 transport stream multiplexer. 4. The transport stream multiplexing device according to claim 2, wherein the subsequent stage MPEG2 transport stream multiplexing device includes a rewrite permission signal and a selection signal from the preceding stage MPEG2 transport stream multiplexing device. Both output the input destination information of the subsequent MPEG2 transport stream multiplexer as additional information,
Additional information output means for inputting an MPEG2 transport stream from the first-in first-out first-in means, a first selector for selecting rewrite data output from the first-stage first selector, a first-stage first selector and a second-stage An MPEG2 transport stream multiplexing apparatus comprising: a first selector; and selection signal generation means for generating a control signal for controlling selection of rewrite data in the first selector. 7. An MPEG2 transport stream multiplexing device comprising at least one of a preceding stage and a succeeding stage.
The G2 transport stream multiplexing device inputs, as an input signal, an MPEG2 transport stream in which PCR is multiplexed to one or more inputs, and performs PCR detection functioning as PCR position detecting means for detecting a PCR of the input signal for each of the inputs. Means, a PCR calculating means connected to the PCR detecting means for adding a delay time between input and output of the transport stream multiplexing device and outputting the result as PCR rewrite data, and an input destination of the input MPEG2 transport stream. Selection signal generation means for outputting a selection signal, and an output of each of the PCR calculation means, which is selected by a selection signal from the MPEG2 transport stream multiplexing apparatus at the subsequent stage, to select the MPEG2 at the latter stage.
A first selector for outputting to a transport stream multiplexer, wherein the subsequent MPEG2 transport stream multiplexer is the transport stream multiplexer according to claim 4 or 5, wherein the preceding MPEG2 transport stream is Additional information output means for outputting, as additional information, a selection signal indicating an input destination from the multiplexer and input destination information of the subsequent MPEG2 transport stream multiplexer, and a first selector of the preceding MPEG2 transport stream multiplexer Selection signal generation means for generating a selection signal for controlling selection of PCR rewrite data by the first and second selectors for selecting and outputting PCR rewrite data output from the previous-stage selector by the selection signal
An MPEG2 transport stream multiplexer comprising a selector. 8. A delay holding means for holding and delaying input data of an MPEG2 transport stream by a time from the beginning until a PID arrives, and a PID detecting means for detecting a PID of the input data. Null determination means for outputting a null detection signal as additional information when a null packet is detected by the detected PID, and a rewrite permission signal for permitting rewriting of the input MPEG2 transport stream is output from the beginning to the end of the packet. And rewrite data to a completely different M
2. The MPEG2 transport stream multiplexing apparatus according to claim 1, further comprising: a rewriting permission signal generating unit that converts the PEG2 transport stream into a rewrite permission signal. 9. A delay holding means for holding and delaying input data of an MPEG2 transport stream for a time from the beginning until a PID arrives, and a PID detecting means for detecting a PID of the input data. When a null packet is detected by the detected PID, a null detection signal is output as first additional information, and position information from the beginning to the end of the transport stream packet input to the first-in first-out means is output as second additional information. Null determination means for outputting, and rewrite permission signal generation means for generating a rewrite permission signal based on the position information from the beginning to the end and converting the rewrite data into a completely different MPEG2 transport stream. 3. The MPEG2 transport stream multiplexer according to claim 2. 10. An apparatus comprising one or more MPEG-2 transport stream multiplexers at a preceding stage and a succeeding stage.
The EG2 transport stream multiplexing device includes a null packet discrimination signal output unit that indicates that the sending MPEG2 transport stream is a null packet. 3. The transport stream multiplexing device according to claim 1, further comprising: additional information output means for inputting a null packet discrimination signal from said previous stage MPEG2 transport stream multiplexing device and outputting it as additional information. Stream multiplexer.