通信音视频编解码技术的研究与应用

Research and Application of Encoding and Decoding in Audio and Video Communication

针对通信中音视频数据量过大、传输时间过长的问题。本研究基于用户对通信过程中音视频信号编解码需求,设计出通信音视频编解码系统,构建在Linux系统下的开源框架,应用Hi3531处理器,将AD9886A作为视频输入芯片,使用TW2984芯片用来采集音频信号。音视频编解码算法对视频信息图像进行帧间预测、运动估计、变换量化和滤波,使用离散余弦变换,避免了音视频信息逆变换中出现错配的问题。实验结果表明,本研究的编码时延为65 ms,传输、解码时延为168 ms,解码效率高。

Aiming at the problem of excessive audio and video data volume and long transmission time in communication,based on the user’s needs for the audio and video signal encoding and decoding in the communication process,a communication audio and video encoding and decoding system is designed.The system is built on an open source framework under the Linux system,and uses the Hi3531 processor.The AD9886A is used as the video input chip,and the TW2984 chip is used to collect audio signals.The audio and video codec algorithm performs inter-frame prediction,motion estimation,transform quantization and filtering on video information images,and uses discrete cosine transform to avoid the problem of mismatch in the inverse transform of audio and video information.The experimental results show that the coding delay of this study is 65 ms,the transmission and decoding delay is 168 ms,and the decoding efficiency is high.