摘要
针对当前移动端到端保密通信方式存在的问题,研究基于网络"无感"的高质量端到端保密通信方法。关于其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,分析了一种声码器的结构原理,提出了类语音调制解调算法,将加密语音数据经类语音转换调制到终端声码器的输出比特流上进行传送。介绍了调制解调算法的比特映射模型及相关参数码本的设计方法。
In order to overcome the problems existing in current end-to-end secure mobile communication patterns,we studied high quality end-to-end secure communication scheme based on network＂imperception＂. In light of the issue that the speech data can not be correctly decoded by vocoder due to its randomized encryption process,after analyzing the structure and principle of a kind of vocoder named EVRC,we presented a speech-like modem algorithm to deal with it. The algorithm modulates the encrypted speech data onto the export bits stream of terminal vocoder via speech-like transform. We introduced the mapping models of bits-to-parameters and parameters-to-bits,and the designing method of parameters code book in the modulating and demodulating algorithm.
出处
《计算机应用与软件》
CSCD
2010年第4期64-67,共4页
Computer Applications and Software
基金
国家高技术研究发展计划项目(2007AA01Z431)
关键词
类语音
调制
解调
声码器
Speech-like Modulate Demodulate Vocoder
