60路PCM/ADPCM转换器  

A 60 Channel PCM/ADPCM Transcoder

作　　者：戴文琪[1] 郑树生[1] 宣建华[2] 

机构地区：[1]浙江大学 [2]浙江大学信息电子系

出　　处：《通信学报》1991年第2期82-88,共7页Journal on Communications

摘　　要：根据CCITT G.721建议32 kbit/s ADPCM算法,本文在用DSP实现PCM/ADPCM转换器场合,用六阶固定极点代替CCITT建议的二阶自适应极点,缩短运算时间,该传输性能仍达到了CCITT规定指标,使转换器需用TMS 32010数目减半。本文还提出一种60路PCM/ADPCM转换器并行处理流水作业实现方案。虽实现复杂,但便于VLSI集成,其体积、功耗、成本较DSP小得多。Based on the 32 kbit/s ADPCM-algorithm suggested by the CCITT Recommendation G.721, in the DSP implementation of PCM/ADPCM transcoder we use six-order fixed poles instead of the two adaptive-poles, which are recommended by CCITT. This method can decrease the operation time and reduce the number of DSP (TMS 32010) to a half. At the same time the performance of our algorithm satisfies the standard of CCITT recommendation G721. This paper also proposes a method of implementation of 60 PCM/ ADPCM transcoder, which is based on pipeline processing. Even though complicated, the method is suitable for VLSI implementation, which has smaller volume, lower-power consume and lower-price than the DSP implementation.

关 键 词：PCM ADPCM 变换器 脉冲码调制 

分 类 号：TP335[自动化与计算机技术—计算机系统结构]