基于TMS320C6701EVM及其扩展子板的多路声回波对消系统  

A multi-channel acoustic echo cancellation system based on TMS320C6701 EVM and an extended daughter Board

作　　者：田芳芳[1] 何培宇[1] 毛新胜[1] 

机构地区：[1]四川大学电子信息学院,成都610064

出　　处：《四川大学学报（自然科学版）》2009年第3期623-628,共6页Journal of Sichuan University(Natural Science Edition)

基　　金：国家自然科学基金(60472096)

摘　　要：利用TMS320C6701 EVM及其音频扩展子板设计并实现了一种基于盲信号分离的多路声回波对消系统。通过音频模数转换器(PCM4204)采集多路混合语音信号,以浮点DSP(TMS320C6701)作为运算处理单元,由音频数模转换器(PCM4104)发送分离后的语音。采用时分多路复用与DMA相结合的传输方式,解决了音频芯片采样率与系统时钟频率不匹配的矛盾;板上开关式控制结构极大地增加了软件编程的灵活性;优化的线性汇编代码设计保证该系统能够进行实时处理,实验证明,系统具有很好的稳定性、可靠性及可扩展性。A blind signal separation-based multi-channel acoustic echo cancellation system is designed and implemented with TMS320C6701 EVM and an extended daughter board. The multi-channel data acquisition and transmission units of the system are composed of an analog-to-digital converter （PCM4204） and a digital-to-analog converter （PCM4104）, respectively. Floating-point DSP （TMS320C6701） performs the main processing. The confliction between sampling rate of audio codec and system clock is solved by a skillful combination of time division multiplexing （TDM） and DMA. Flexibility of software programming is improved with the use of onboard DIP switches. Optimized linear assembly programming ensures the system＇s real-time performance. Experiment results show that the system is of great stability, relia-bility and extendibility.

关 键 词：多路声回波对消 盲信号分离 麦克风阵列 浮点DSP 时分多路复用 线性汇编 

分 类 号：TP202.7[自动化与计算机技术—检测技术与自动化装置]