JP2000023075A - Digital video / audio recording / reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display reproduction time of a recorded system steam file and to improve usability by a user by graphically displaying the data information on the system stream file and selecting this file by a button. SOLUTION: A multiplexing part 18 generates a system stream from the video and audio streams, and the system stream is recorded on a recording medium 21 as a file. A microcomputer 17 of an MPEG camera 20 reads the file information on the system stream out of the medium 21 and retrieves the recorded bit rate information. The bit rate information is integrated with the value that is decided by an MPEG1 standard, and a sound bit rate is added to the integrated bit rate information. Thus, the bit rate of the system stream is decided. The file size is read out of an FAT and the file reproduction time is calculated from the file size and the bit rate information on the system stream.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique relating to convenience of a digital video / audio recording / reproducing apparatus such as a digital video camera and a surveillance camera.

[0002]

2. Description of the Related Art In a conventional video / audio recording / reproducing apparatus, a user can obtain a reproduction time by calculation by displaying a file size of file data of a recorded system stream file.

[0003]

In the above prior art,
It is valid when the recording bit rate is only one, but if you can select several recording bit rates,
Was not taken into account.

[0004] It is an object of the present invention to improve the user's convenience by displaying the playback time of a recorded system stream file in an image / audio recording / reproducing apparatus in which the user can select several recording bit rates. .

[0005]

SUMMARY OF THE INVENTION An MPEG CODEC section for compressing / expanding a video signal at a fixed rate, an MPEG AUDIO section for compressing / expanding an audio signal, and a multiplex for multiplexing a compressed video signal and an audio signal to generate a system stream. Unit, recording medium for recording system stream as a file, function to select recording bit rate of video signal by button operation, display display unit that can display recorded system stream, graphic display of data information of recorded system stream file And a file selection screen that allows the user to select a system stream file displayed on the graphic display by using buttons.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

First, the operation of the embodiment of the present invention will be described.

FIG. 1 is a block diagram of one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a lens, 2 denotes an image sensor, 3 denotes a camera signal processing unit that converts an electric signal into a video signal, 4 denotes a microphone, and 5 denotes an A / D that converts audio input from the microphone 5 into a digital signal. A converting unit 6 for compressing the video signal of the camera signal processing unit 3 to generate a video stream; an audio buffer 7 for temporarily storing the digital audio signal output from the A / D converting unit 5; Reference numeral 8 denotes a graphic processing unit, 9 denotes a bit rate processing unit for compressing a video signal, 10 denotes an MPEG CODEC unit including a video processing unit 6 and an audio buffer 7, and so on.
1 is an operation button, 12 is an MPEG AUDIO section that compresses a digital signal output from the A / D conversion section 5 to generate an audio stream, 13 is a recording medium control section, and 14 is a button input processing section for the operation button 11.

Reference numeral 15 denotes a graphic control unit, and 16 denotes a button input processing unit 1
A processing unit for setting a bit rate for compressing the video signal processed in step 4; a microcomputer 17 for processing the MPEG AUDIO unit 12, recording, and a graphic control unit;
A multiplexing unit for synchronizing and multiplexing the video stream compressed by the video processing unit 6 and the audio stream compressed by the MPEG AUDIO unit 12 to generate a system stream, and 19 denotes a system stream of the recorded system stream A graphic display unit for displaying file information, 20 is an MPEG camera using the present invention, and 21 is a recording medium for recording a system stream.

FIG. 2 is a flowchart of the internal processing of the microcomputer 17 when obtaining the reproduction time.

Hereinafter, this embodiment will be described.

The signals collected by the lens 1 are combined on the image sensor 2 and converted into electric signals. After passing through the camera signal processing unit 3, the bit rate processing unit 9 controls the bit rate based on the information of the video bit rate setting unit 16, and the video processing unit 6 compresses it to generate a video stream. On the other hand, the audio signal collected by the microphone 4 is converted into a digital signal by an A / D converter 5, temporarily stored in an audio buffer 7, and the audio data is compressed by an MPEG AUDIO unit 12 to form an audio stream. Generate.

A multiplexing unit 18 generates a system stream from the video stream and the audio stream. The generated system stream is recorded on the recording medium 21 as a file.

The microcomputer 17 of the MPEG camera 20 reads the file information of the system stream recorded on the recording medium 21, searches for the bit rate information recorded in the file, and integrates the value specified by the MPEG1 standard. Further, the bit rate of the system stream is obtained by adding the bit rate of the audio. Further, the file size is read from the FAT (file allocation table), the file playback time is calculated from the file size and the bit rate information of the system stream, the calculation result is converted into graphic data by the graphic control unit 15, and the graphic processing unit 8, the playback time of the file is displayed on the graphic display unit 19.
FIG. 2 is a flowchart showing the internal processing of the microcomputer in this processing.

[0015] The reproduction time to be displayed graphically can also be obtained from the time code recorded in the system stream.

[0016]

According to the present invention, in a video / audio recording / reproducing apparatus in which a user can select a recording bit rate of several video signals, the reproduction time of a recorded system stream file is displayed, thereby improving user convenience. Can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining an image / audio recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining a process for acquiring a reproduction time of a file in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lens, 2 ... Image sensor, 3 ... Camera signal processing part, 4 ... Microphone, 5 ... A / D conversion part, 6 ... Video processing part, 7 ... Audio buffer,
8: Graphic processing unit, 9: Bit rate processing unit, 10: MPEG CODEC unit, 11: Operation buttons, 12: MPEG AUDIO
Unit, 13: recording medium control unit, 14: button input processing unit, 15: graphic control unit, 16: bit rate setting unit, 17: microcomputer,
18 multiplex part, 19 graphic display part, 20
... MPEG camera, 21 ... Recording medium.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B075 ND12 ND14 ND18 ND23 ND40 PP13 PP30 PQ02 PQ13 PQ40 UU40 5C022 AA03 AA11 AA13 AC00 AC03 AC11 5C053 FA10 GA10 GB37 HA33 HA40 JA07 KA04 KA25

Claims (1)

[Claims] An MP for compressing and expanding a video signal at a fixed rate.
EG CODEC, MPEG for compressing and expanding audio signals
AUDIO section, multiplexing section for multiplexing the compressed video signal and audio signal to generate a system stream, recording medium for recording the system stream as a file, function of selecting the recording bit rate of the video signal by button operation, recorded It has a display section capable of displaying a system stream, a display section for graphically displaying data information of a recorded system stream file, and a file selection screen capable of selecting a system stream file displayed on the graphic display by a button. A digital audio / video recording / reproducing apparatus characterized in that the reproduction time of a recorded file is displayed on a graphic selection file display screen.