数字降噪耳机中自适应滤波器的设计实现.PDFVIP

数字降噪耳机中自适应滤波器的设计实现 刘 拿1 , 2, 3 1 2 3 杨红官 程亚奇 姚胜南 (1.湖南大学,湖南 长沙410082;2. 中国科学院微电子研究所,北京100029; 3.广东装备制造工业研究院,广东 中山528403) 摘要 随着社会工业生产的不断进步，各种噪声污染越来越严重。目前普遍采用的模拟降噪 方法已不能满足要求，未来的研究将朝着以数字信号处理器及相关算法为技术支撑的数字降 噪技术发展，其中一个重要应用则为数字降噪耳机的设计。数字降噪耳机设计主要是通过自 适应滤波器来实现的。文中采用LMS 算法在MATLAB 中实现了自适应滤波器的设计与实 现。在MATLAB 中建立了数字降噪耳机系统模型，并且针对该模型利用MATLAB 语言进 行编程及C 语言编程。模型以及程序仿真结果表明此设计实现了对信号中混有的环境噪声 进行降噪，并且效果远远高于模拟降噪技术。 关键词 数字信号处理器；数字降噪耳机；LMS 算法；自适应滤波器 中图分类号 TN713+.7 文献标识码 A The Design and Implementation of Adaptive Filter in Digital Noise cancellation earphone LIU Na1, 2, 3 YANG Hong-guan1 CHENG Ya-qi2 YAO Sheng-nan3 (1. Hunan University ,Hunan Changsha 410082,China;2.Institute of Microelectronics of Chinese Academy of Sciences ,Beijing 100029 ，China;3 .Guangdong Equipment Manufacture Institute ,Guangdong Zhongshan528403，China) Abstract With the continuous development of the social industry, several of noise pollution is getting worse. However, the analog noise cancellation method commonly used now has been unable to meet the requirements of future research, so the future research will move to digital noise cancellation technology which is supported by the digital signal processor and related algorithm. And the design of digital noise cancellation earphone is the main application of it. Digital noise cancellation technology is mainly achieved through the adaptive filter. In this paper, the design and implementation of adaptive filter is achieved in MATLAB using the LMS algorithm. The technology system model of digital noise cancellation earphone is created, and programming in accordance with the model using matlab and C lan