IP电话系统中语音芯片的DSP实现

介绍了一种具有G．723．1语音编解码、自适应回声抵消DTMF编解码功能的语音芯片，以满足IP电话系统中低速率语音通信的需要。根据DSP内核的特点，对G．723．1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（NL MS）自适应滤波器实现,采用Goertzel算法实现DTMF的检测。使用较少的资源,在一块TMS320C5402芯片上集成了以上全部功能。

Realization of a Speech Coder Being Used in IP Telephone System on DSP

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. ;;;