如何将fir1阻带滤波器变成多个阻带滤波器 [英] How can I turn an fir1 stop-band filter into a multiple stop-band filter

问题描述

可以用fir1(N，[w1 w2]，'stop')制作一个带阻滤波器，其中N是滤波器系数的数量，w1是开始停止频率，w2是结束停止频率，如何我可以把它变成一个多阻带滤波器吗?有没有直接的方法可以做到这一点?

A single band-stop filter can be made by fir1(N,[w1 w2],'stop'), where N is the number of filter coefficients, w1 is the beginning stop frequency, w2 the ending stop frequency, how can I turn this into a multiple stop-band filter? Is there a straight forward way to do this?

推荐答案

使用conv确定适当的系数:

use conv to determine the proper coefficients:

b =  fir1(50,[0.2 0.3],'stop');
b2 =  fir1(50,[0.7 0.8],'stop');
freqz(conv(b,b2),1);

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