How to design a narrow bandpass filter to pass frequencies between 90 and 110 Hz?

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David 2014-9-16

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回答： Honglei Chen 2014-9-16

My aim is to pass 100 Hz frequencies of my input signal (only), however I can afford to have ± 10 Hz of filtration inaccuracy.

My input signal has sampling frequency of 44100 Hz. How can I go about this? I've come up with this code so far:

[input, fs] = wavread('');

fc = [90,110];

T = 1/fs;

fn = fc/(fs/2);

Rs = 40;

N = 9;

[B,A] = cheby2(N,Rs,fn,'bandpass');

filter(B,A,input);

Thank you in advance!

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Honglei Chen 2014-9-16

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https://ww2.mathworks.cn/matlabcentral/answers/155038-how-to-design-a-narrow-bandpass-filter-to-pass-frequencies-between-90-and-110-hz#answer_151883

You may want to use cheb2ord to estimate the order of the filter first, that function will also return the ws needed in cheby2 function.

HTH

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