基于原型滤波器的语音信号滤波分析与仿真实现

摘要

滤波器是对特定频率的频点或该频点以外的频率进行有效滤除,以得到一个特定频率或消除一个特定频率的电路.原型滤波器又是设计其他滤波器的基础.本文基于MATLAB实验平台,研究了原型滤波器的基本概念和设计方法,介绍了巴特沃思滤波器和切比雪夫Ⅰ型滤波器,并且运用MATLAB对语音信号进行频谱分析.%The filter can be eliminated from the received signal or weaken the noise to extract useful signals. The prototype filter is the basic of other filters. This paper, which based on Matlab, mainly studies the basic way to design prototype filter, and give an emphasis on the basic concepts of Butterworth filter and Chebyshev filter. Digital filter's design specifications come from analog prototype filter by frequency transform. Filtering and simulating the voice signal based on the prototype filter, and the method given by the frequency mapping method can be converted to the desired filter.