This article mainly describes the concept and principle of encoding in the first and second chapters. The third chapter mainly describes Adaptive Differential Pulse Code Modulation (ADPCM) algorithm, adaptive quantizing and adaptive predicting algorithm.

• 本文从编码的概念和基本理论出发，论述了自适应差值脉码调制(ADPCM)编码的算法，重点介绍了自适应量化和自适应预测算法。