基于DSP的CVSD与PCM编码全数字转换技术  

Technique for all-digital code conversion between CVSD and PCM based on the DSP

作　　者：张璇[1] 王福昌[1] 童胜勤[1] 

机构地区：[1]华中科技大学电子与信息工程系

出　　处：《华中科技大学学报（自然科学版）》2003年第1期64-66,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

摘　　要：提出并实现了一种基于DSP的 16Kbit/sCVSD(连续可变斜率增量调制 )编码与 6 4Kbit/sA律PCM(脉冲编码调制 )编码的全数字转换技术 .相对于现有的编码转换系统 ,此种技术符合单值对应法则 .实验证明 ,当CVSD误码率≤ 2× 10 -5且PCM误码率≤ 1× 10 -5时 。The technique for all digital mutual conversion between 16Kbit/s CVSD (continuously variable slope delta) encoded signals and 64?Kbit/s A law PCM (Pulse Code Modulation) encoded signals was proposed and made possible by the DSP chip in this paper. Compared with the existing code conversion scheme, the proposed technique was in accordance with the single value correspondence principle. When the bit error rate of the CVSD encoded signals did not exceed 2×10 -5 and the bit error rate of A law PCM encoded signals did not exceed 1×10 -5 , cumulative distortion could be eliminated regardless of the number of the tandem transcodings in the steady state mode.

关 键 词：CVSD PCM 全数字转换技术 连续可变斜率增量调制 脉冲编码制 DSP 语音编码 编码转换算法 

分 类 号：TN912.3[电子电信—通信与信息系统]