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Audio and video frequency signal synchronizing method

A signal synchronization, audio and video technology, applied in the direction of pulse modulation TV signal transmission, etc., can solve problems such as the degradation of received video quality

Inactive Publication Date: 2007-01-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method embeds an uncompressed digital audio signal, so the number of audio bits to be embedded is large, which inevitably reduces the quality of the received video.

Method used

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Embodiment Construction

[0015] The core content of the present invention is a technique for embedding compressed audio bits into a video coding system to realize synchronization of audio and video signals. In the existing embedding and extraction technology, its main application is watermark processing in information security, which requires less information to be embedded, and its purpose is only to detect the existence of watermark, and its technology requires that the information be embedded with security , robustness, imperceptibility, anti-attack and other characteristics. The embedding and extraction technology adopted in the present invention is to be applied in the synchronous system of audio and video signals, therefore, the number of embedded information bits is large and it is required to extract the embedded information bits as 0 or 1 without distortion. In order to extract the compressed audio bits embedded in the encoding process without distortion at the decoding end, and to minimize t...

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Abstract

A synchronous method of audio-video signal includes utilizing correlation of two medium-low frequency coefficient with minimum distance in quantized coefficient block at MPEG-2 and AVS video coding system to embed compressed audio coding bit into one of coefficients, then carrying out variable length coding or arithmetic coding on coefficient block embedded with compressed audio bit according to scheme in original video coding system to obtain coding bit stream of mixed signal and to restore embedded video coefficient in decoder according to submitted audio bit.

Description

technical field [0001] The invention relates to a synchronization method capable of synchronously transmitting and playing audio signals and video signals. Background technique [0002] At present, in various network video, VCD, DVD, digital TV, and emerging IPTV, mobile TV and other video playback applications, international standards and other non-standard methods separate the compression and coding of video and its accompanying audio signal. They are also transmitted through different data units (packets, packets or frames, etc.), and the compression coding of audio and video signals adopts completely different methods. Therefore, it is inevitable to solve the synchronization problem of audio and video. Especially in network video applications, the throughput and transmission delay of the network at different times are constantly changing, which makes it difficult for the packets transmitting video signals and the packets transmitting corresponding audio to reach the rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24
Inventor 陈贺新赵岩齐丽凤桑爱军祝宇鸿陈绵书
Owner JILIN UNIV