基于DSP的声信号降噪系统的设计与实现  

Design and implementation of acoustic signal denoising system based on DSP

作　　者：齐子元[1] 米东[1] 徐章隧[1] 

机构地区：[1]军械工程学院无损检测技术研究所,河北石家庄050003

出　　处：《计算机工程与设计》2008年第5期1174-1176,共3页Computer Engineering and Design

基　　金：国家自然科学基金项目(50475053)

摘　　要：基于DSPTMS320VC5502和音频采样芯片TLV320AIC23构建了声信号降噪系统,分析了该系统的总体结构设计和软件处理流程设计。在DSP/BIOS控制机制下,建立了基于DMA、双缓冲区切换和中断响应机制等技术的音频信号采集与处理的程序框架。提出了一种基于多分辨分析的小波频带阈值降噪方法,并应用TDS5502EVM板和TDS560仿真器对优化的小波阈值降噪算法进行了实时仿真,实现了对强噪声语音信号的分析与降噪处理,并通过一个实例信号验证了系统的良好性能。DSP TMS320VC5502 and the sampling chip TLV320AIC23 are used to compose an acoustic signal denoising system, and the whole structure and software flow control structure of the system are analyzed. The program infrastructure of audio signal sampling and processing is built based on DMA data transfer, double buffer switched and interrupt response mechanism under the control of DSP/ BIOS. A wavelet frequency band threshold denoising method based on multi-resolution analysis is presented. Real-time simulator of wavelet denoising algorithm is completed based on TDS5502EVM board and TDS560 simulator, and then the analysis and cancellation processed of speech signal within the high noise is implemented. A speech signal with noises tests the validity of the system.

关 键 词：数字信号处理 小波分析 声信号 阈值 降噪 

分 类 号：TN912.3[电子电信—通信与信息系统]