This article introduces principle and code scheme of ADPCM, presents a code schemes which adapts to convert 128kb/s data of uniform PCM into 16kb/s data of ADPCM, and provides the results and analysis of experiment.

• 介绍了ADPCM的原理及编码方案 ,对适用于12 8kbit/s的均匀PCM信道数据和 16kbit/s的ADPCM数据的转换的编码方案进行了实验测试 ,给出了分析实验结果