摘要： 介绍了一种具有语音编解码、自适应回声抵消和编解码功能的语音芯片,以满足电话系统中低速率语音通信的需G.723.1DTMFIP要。根据内核的特点,对算法进行了优化,降低了算法复杂度;回声抵消部分使用归一化最小二乘自适应滤波器实现;DSPG.723.1(NL MS)采用算法实现的检测。使用较少的资源,在一块芯片上集成了以上全部功能。

关键词: 语音编码, 回声抵消, 双音多频, DSP

Abstract: A speech CODEC chip is introduced in this article,which has the facilities of G.723.1 speech CODEC, adaptive echo canceling and DTMF CODEC to meet the requirement of low bit rate communication in IP telephone systems. The G.723.1 algorithm is optimized to reduce the computational complexity according to the architecture of the DSP core; the echo cancellation is realized with the normalized least mean square(NLMS) adaptive filter; uses Goertzel algorithm to achieve DTMF detecting.All the modules are integrated in one TMS320C5402 DSP chip using less memory sources. ;;;

中图分类号: 

• TN916