一、概述目前,在语音通讯中,为了提高语音质量、增加抗干扰性能和介决运距离传输等问题,技术先进的国家逐渐采用将语音信号数字化后进行传输.这样带来的一个问题就是传送同样一路话所占用的信道频带要加宽.为了节省频带,就需要去除语音信息中的多余度,大幅度地压缩语音频带,声码器是目前大幅度压缩语音频带的一种常用设备,而声码器中最关键的部分 I. Overview At present, in the voice communication, in order to improve the voice quality, increase the anti-interference performance and solve the problems such as the transmission of distance, the advanced countries gradually adopt the digital voice signal for transmission, resulting in a problem of transmitting In order to save the frequency band, it is necessary to remove redundancy in the voice information and greatly compress the voice frequency band. Vocoder is currently a commonly used device for compressing the voice band by a large margin. However, Vocoder in the most critical part