基于DSP的场域主动降噪系统

Active Noise Reduction System in Field Based on DSP

为了解决低频噪声难以消除的问题,分析了主动降噪原理和基于最小均方误差准则的自适应算法,以TMS320VC5509A数字芯片作为核心,搭建低频噪声主动降噪系统。详细介绍了与系统相关的McBSP、AIC23B等模块,利用CCS(Code Composer Studio)集成开发环境开发基于最小均方(Least Mean Square,LMS)算法的软件程序。在实际环境中,利用一系列测试噪声进行模拟实验,验证系统的降噪结果。测试结果表明,系统在低频分量处的降噪效果较为显著。

To solve the problem that low-frequency noise is difficult to eliminate,this paper analyzes the active noise reduction principle and the adaptive algorithm based on the Least Mean Square error criterion,and builds a low-frequency noise active noise reduction system with the TMS320VC5509A digital chip as the core.The McBSP and AIC23B modules related to the system are introduced in detail,and the software program based on the Least Mean Square(LMS)algorithm is developed using the CCS(Code Composer Studio)integrated development environment.In the real environment,a series of test noises are used for simulation experiments to verify the noise reduction results of the system.The test results show that the system has a significant noise reduction effect at the low frequency component.