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简要介绍语音编码技术中的波形编码器和声码器的主要特性。详细阐述Ｑ４４０１可变速率声码器的工作原理和各种功能，包括Ｑ４４０１的内部结构及管脚、ＱＣＥＬＰ编码器和解码器、帧定时方式、ＰＣＭ接口和ＣＰＵ接口、初始化过程及命令格式等。说明了Ｑ４４０１的应用范围，并设计了一种典型应用实例。该声码器将语音信号压缩至４～９．６ｋｂ／ｓ范围时，可达到普通电话的通话效果，其应用范围将是十分广泛的。
Briefly introduce the main features of waveform encoder and vocoder in speech coding technology. Details Q4401 variable rate vocoder works and various functions, including Q4401 internal structure and pin, QCELP encoder and decoder, frame timing, PCM interface and CPU interface, the initialization process and command format. Describes the application of Q4401, and designed a typical application examples. The vocoder will voice signal compression to 4 ~ 9.6kb / s range, the call can reach the ordinary telephone effect, the scope of its application will be very extensive.