Lowpass filter with L=50?
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Dick Rusell
le 9 Oct 2014
Commenté : Star Strider
le 9 Oct 2014
I'm not sure how to make a lowpass filter with L=50, cutoff frequency 1100Hz with omegac, and a sampling frequency of 8000Hz using the Fourier Series Method.
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Star Strider
le 9 Oct 2014
Here is my approach:
Fs = 8.0E+3;
Fn = Fs/2;
Fc = 1.1E3;
Fcn = Fc/Fn;
L = 50;
b = fir1(L, Fcn);
figure(1)
freqz(b, 1, 128)
Does it do what you want?
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Star Strider
le 9 Oct 2014
That definitely changes things.
The best resource I can find on that is Low-Pass Filtering by FFT Convolution that also has MATLAB code. All you would need to do is to modify it to your Fs and L. (It’s not an image, so you can copy-paste the code directly from the page.)
I can’t find any MATLAB functions that implement it directly.
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