电话话音信号的加密及其实现方法的研究

话音信号加密研究由来已久，模拟加密、ＡＤＡ加密方式以及声码器的应用也较为普及，但从普通应用角度来说，话音加密的普及则必须找到一种加密程度适中，整机价格偏低的形式，使之能够在日常的商业往来、私人电话通信等中得到普及与应用。在分析电话话音信号加密及其实现方法的基础上，着重分析ＡＤＡ加密方式使话音信号频带拓展的原因，并提出解决该问题以及有关回波抑制的一种新思路、新方法，为上述目的的实现开拓一个新领域打下基础。

Research on the Method of Speech Signal Encryption

Research on the speech signal encryption has been for a longer time.Analog or ADA encryption and vocoder are generally more used.But a technique must found that has appropriate encryption and makes its product cheaper,so that it can be used in daily business and private telephone communication.Based on the analysis of some methods of speech signal encryption,this article analyses the cause of speech signal frequency bandwidth to expand in ADA encryption,and holds up a new way to solve it and to restrain echo.