JPH07322202A - Moving image coder, moving image decoder and moving image storage device - Google Patents

Abstract

PURPOSE:To improve the operating efficiency of a file device in the moving image storage device. CONSTITUTION:A no-video image state detection section 4 and a non-sound state detection section 6 are used to detect a non-video image state and a non- sound state. When a moving image is coded, coding is implemented by using a non-video image data code in the non-video image state and by using a non- sound data code in the non-audio state, and a synchronizing signal addition section 7 adds a synchronizing signal to coded data to take synchronization between video image data and sound data. When a moving image is decoded, a synchronizing signal detection section 10, a video decoder 11 and a sound decoder 12 decode the moving image based on the synchronizing signal added in the coding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving image storage device.

[0002]

2. Description of the Related Art In a conventional moving image storage apparatus, when a moving image composed of video and audio is encoded, even when a non-video state or a no-voice state occurs, the video is directly coded, It was stored in the file as a code in the silent state.

[0003]

In the conventional moving picture storage device, since coding is performed in the same manner as in the video-on state and the voice-on state even when the non-video state and the no-voice state occur, the moving image There is a problem that the capacity of encoded data becomes large.

An object of the present invention is to provide a moving picture coding apparatus, a moving picture decoding apparatus, and a moving picture storage apparatus in which the amount of coded data is small and therefore the usage efficiency of the file device is high.

[0005]

SUMMARY OF THE INVENTION A moving picture coding apparatus according to the present invention comprises a no-picture detecting section for detecting a no-picture state of a video signal, and a no-picture detecting section for coding the video signal and detecting the no-picture detecting section. A video encoder that replaces the video state portion with a non-video data code, a voiceless detection unit that detects the voiceless state of an audio signal, and a voiceless portion that is encoded by the voice signal and detected by the voiceless detection unit. And a video encoder having a sync signal adding unit for adding a sync signal to the coded video signal and audio signal.

Further, the moving picture decoding apparatus of the present invention synchronizes the video data and the audio data on the basis of the sync signal detecting section for reading the sync signal from the coded video data and the audio data. The video decoding device includes a control unit, a video decoder that decodes a video signal, and an audio decoder that decodes audio data.

Further, the moving picture storage device of the present invention comprises a no-video detecting section for detecting a no-video state of a video signal, and a no-video state portion detected by the no-video detecting section by encoding the video signal. To a non-video data code, a non-voice detecting section for detecting a non-voice state of an audio signal, an encoding of the voice signal, and a portion of the non-voice state detected by the non-voice detecting section is voice data. An audio encoder that replaces a code, a moving picture coding device that has a sync signal adding unit that adds a sync signal to the coded video signal and audio signal, and synchronization that reads the sync signal from the coded video data and audio data A signal detection unit, and a control unit for synchronizing video data and audio data based on the synchronization signal,
It includes a video decoder that has a video decoder that decodes a video signal and an audio decoder that decodes audio data.

[0008]

Since the video data and the audio data in the non-video state and the non-audio state are not encoded as they are but are replaced with the non-video state data code and the non-audio data code to be encoded, the encoded data of the moving image is The file capacity is reduced and the efficiency of using the external file device is improved.

[0009]

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

FIG. 1 is a block diagram of a moving image storage apparatus according to an embodiment of the present invention.

Video signals and audio signals input from the camera 1 and the microphone 2 are encoded by the video encoder 3 and the audio encoder 5, respectively. The video encoder 3 and the audio encoder 5 are respectively connected to the no-video state detecting unit 4 and the no-voice state detecting unit 6, and when the no-video state and the no-voice state are detected, the no-video state notification or the no-voice state is sent. By the status notification, the video encoder 3 and the audio encoder 5 are notified of the non-video status and the non-audio status. The video encoder 3 and the audio encoder 5 do not encode the video data and the audio data in the non-video state and the non-audio state, and only insert the non-video data code and the non-audio data code into the code data. To do. For example, in the case of FIG. 2, a non-voice data code is inserted into the voice signals A2 and A3.

When the video data and the audio data are encoded in a form including the non-video data code and the non-audio data code, it is necessary to synchronize the video and the audio, and thus the encoded video data and A sync signal for synchronization is added to the audio data by the sync signal adding unit 7. In this way, the video data and the audio data encoded by the moving image encoding device 16 are transmitted to the moving image decoding device 17.

The moving picture decoding device 17 receives the coded data of video and audio sent through the transmission path, and then writes the data into the external file device 9 by the input / output unit 8.
When decoding the encoded video data and audio data written in the external file device 9, the encoded data is read through the input / output unit 8. The sync signal added to the read coded data is detected by the sync signal detector 10
Detected by the control unit 1 based on the detected synchronization signal.
3 synchronizes the video data and the audio data, sends them to the video decoder 11 and the audio decoder 12, decodes the moving image data, and outputs them to the CRT 14 and the speaker 15.

It should be noted that the detection of no video and no audio is performed by the input level of video and audio. For example, when the power of the microphone / camera is turned off, the input level of video and audio to the no-video state detection unit 4 and the no-voice state detection unit 6 will be almost 0. Has been detected.

[0015]

As described above, according to the present invention, the video data and the audio data in the non-video state and the non-voice state are not encoded as they are, but are replaced with the non-video state data code and the non-voice data code and encoded. As a result, the file size of the encoded data of the moving image is reduced, and the use efficiency of the external file device is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a moving image storage apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of inserting a voiceless data code.

[Explanation of symbols]

 1 Camera 2 Microphone 3 Video Encoder 4 No Video State Detection Section 5 Audio Encoder 6 No Audio State Detection Section 7 Sync Signal Addition Section 8 Input / Output Section 9 External File Device 10 Sync Signal Detection Section 11 Video Decoder 12 Audio Decoder 13 Control Section 14 CRT 15 speaker 16 moving image encoding device 17 moving image decoding device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04N 7/24 H04N 5/93 C 7/13 Z

Claims (3)

[Claims] 1. A no-video detecting section for detecting a no-video state of a video signal, and a video encoder for encoding the video signal and replacing a no-video state portion detected by the no-video detecting section with a no-video data code. And a voice encoder for detecting a voiceless state of a voice signal, a voice encoder for encoding the voice signal and replacing a voiceless state portion detected by the voiceless detector with a voice data code, and an encoder Video coding apparatus having a sync signal adding unit for adding a sync signal to the generated video signal and audio signal. 2. A sync signal detecting unit for reading a sync signal from encoded video data and audio data, a control unit for synchronizing video data and audio data based on the sync signal, and decoding the video signal. A video decoding device having a video decoder for performing audio and an audio decoder for decoding audio data. 3. A no-video detector for detecting a no-video state of a video signal, and a video encoder for encoding the video signal and replacing the no-video state portion detected by the no-video detector with a no-video data code. And a voice encoder for detecting a voiceless state of a voice signal, a voice encoder for encoding the voice signal and replacing a voiceless state portion detected by the voiceless detector with a voice data code, and an encoder A video encoding device including a sync signal adding unit for adding a sync signal to the encoded video signal and audio signal; a sync signal detecting unit for reading the sync signal from the encoded video data and audio data; It has a control unit for synchronizing video data and audio data, a video decoder for decoding video signals, and a video decoding device including an audio decoder for decoding audio data. Moving image storage device.