How to design a narrow bandpass filter to pass frequencies between 90 and 110 Hz?
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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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Answers (1)
Honglei Chen
on 16 Sep 2014
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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