Three kinds of speech encoding schemes, namely, Pulse Code Modulation, A law PCM and Continuous Variable Slope Delta Modulation, are discussed mainly.

• 主要讨论了三种语音编码方案 ,即线性脉冲编码调制 ( PCM,Pulse Code Modulation)、A律 PCM和连续可变斜率增量调制 ( CVSD,Continuous Variable Slope Delta Modulation)。