CCITT G.721标准算法分析  

The Algorithm Analysis for CCITT G.721 Recommendation

作　　者：张星[1] 冯玉珉[1] 

机构地区：[1]北方交通大学通信与控制工程系

出　　处：《北京交通大学学报》1992年第S1期123-129,共7页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

摘　　要：本文论述了 CCITT 1986年提出的32kb/s ADPCM 标准算法结构.详细分析了 G.721自适应量化和自适应预测算法,分析了算法对于话音信号、非话音信号的透明传输特性和无累积失真的同步级联特性,以及用来改善 FSK 信号调制传输性能的单音和过渡检测功能.This paper introduces the standard algorithm configuration of the 32 kb/s ADPCM recommended by CCITT in 1986,and analyses the adaptive quan- tization and adaptive prediction in details.The analysis focuses mainly on the effect of the algorithm to the transparent transmission characteristics of both audio and non-audio signals,the characteristics of the synchronous cascade with no accumulative distortion,and the improvement to the performance of the FSK single tone and transition transmission detecting performance.On the basis of the theory analysis,a single chip DSP TMS 32010 is used as the main part of the system which can implement all the functions of the encoders based on G.721 modified in 1986.This system has passed the data testing sequences satisfac- torily

关 键 词：差分脉码调制 自适应性 量化/自适应预测 

分 类 号：TN911.22[电子电信—通信与信息系统] TN914.[电子电信—信息与通信工程]