In oreder to compare Impulse Invariance method charactristics for transformation analogue filters to digital ones in highpass and bandpass and lowpass formats,here are 6 M-files that simulate a third order butterworth filter analyizing impulse respon

使用各种滤波器对语音信号实现处理，并且通过播放处理前后的语音信号来对比各种滤波器的滤波效果-Using various filters to achieve the speech signal processing, and to compare the effect of various filters filtering the speech signal playback processing by before and after