G.723.1声码器的DSP16k实现

Real-time implementation of G.723.1 speech vocoder on DSP16k

本文介绍了ITU－TG．723．1语音编解码器在朗讯科技（LucentTechnologies）公司新一代定点数字信号处理芯片DSP16k上的实时实现技术。本文编程实现了G.723．1标准的所有功能模块，包括在变码率下的静音检测（VAD）和舒适噪声产生（CNG）模块。本文的实现完全复合ITU－TG.723．1标准的定点算法，通过了ITU－T的所有测试矢量。同时木文比较了G．723.1在两种定点数字信号处理器DSP16xx和DSP16k上实现时内存占用空间和计算复杂度的差异。

This paper describes real-time implementation of the ITU-TG.723.1 speech vocoder on DSP16k digital signal processor of the Lucent Technologies Inc.. The G.723.1 speech vocoder is an ITU-T standard for a dual rate speech encoder and decoder. An option for variable rate operation is possible. The implementation in this paper is fully compliant with the ITU-TG.723.1 Standard for Fixed Point DSPs and it passes aIl ITU-T test vectors. The differences in memory and complekity between the implementations on DSP16xx and on DSP16k are presented.