CCITTG.722音频编码系统及其编、解码器的设计与实现

DESIGN AND REALIZE OF THE CCITT G. 722 AUDIO CODING -DECODING SYSTEM

CCITTG.722建议书描述的是一种50～7000Hz音频信号的压缩编码系统,码率为64kbit/s。该系统采用了子带自适应差分脉冲编码技术(SB—ADPCM),具有FM广播的音质。本文简介了G.722压缩编码系统,介绍了运用TMS320C25定点高速数字,处理器实时实现编、解码算法的方法,分析了编、解码器的工程实现中要解决的主要问题。

The CCITT G. 722 Recommendation describes the characteristics of an audio (50-7, 000Hz) coding system which may be used for a variety of higher quality speech applications. The coding system uses sub - band adaptive differential pulse code modulation(SB - ADPCM ) within a bit rate of 64 kbit/s. This article introduces the G. 722 audio compressed coding system, the method of using the TMS320C25 to realize the real - time coding - decoding algorithm ; and the main problem to be resolved in the engineering.