摘要
ＣＣＩＴＴ Ｇ．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定点高速数字信号处理器实时实现编、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 pa- per introduces the G. 722 audio compressed coding system,the method of using the TMS320C25 to realize the real─time coding ─ decoding algorithm,and the major problem to be solved in the engineering.
出处
《南通工学院学报》
1997年第4期13-20,共8页
Journal of Nantong Institute of Technology
