类语音调制解调器的设计与实现  

Design and implementation of speech-like modem

作　　者：杨典兵[1] 罗兴国[1] 许明艳[1] 

机构地区：[1]国家数字交换系统工程技术研究中心,河南郑州450002

出　　处：《电子技术应用》2009年第5期101-104,共4页Application of Electronic Technique

基　　金：国家863项目(2007AA01Z431)

摘　　要：针对端对端保密通信中语音信号因加密随机化而不能被声码器正确解码的问题,提出了一种类语音调制解调算法,将加密语音数据调制成类语音信号后进行传送。介绍了算法中增益、基音周期和声道相关参数的码本设计方法以及参数的提取、量化和搜索的方法,并利用VC进行仿真,通过对数据进行比对实现增益、基音及声道参数的有效还原。If the speech signal is encrypted before it comes to the encoding block, it will be randomized by the encryption process, and could not be correctly decoded by vocoder. A speech-like modem algorithm is presented to deal with this problem by modulating the encrypted data onto speech-like waveforms. We introduce the method of designing code book of gain, pitch and vo- cal parameters, and the methods of extracting, quantizing and searching parameters, and simulate it with VC. With comparison of the data, we effectively recovere gain, pitch parameters and vocal parameters.

关 键 词：类语音调制解调 增益 基音 声道参数 

分 类 号：TN912.3[电子电信—通信与信息系统] TS976.9[电子电信—信息与通信工程]