Lowpass FIR filter code.

2012 2 4
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更新时间：2016 12 3
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Hello
I need to simulate some audio files using lowpass FIR filter (Digital). I have tried doing it using simulink but I need to do it using a code. Can anyone please tell me how to do it? I am facing a problem as I dot know how to incorporate the audio file(.wav). It would be great if anyone could give me some ideas of doing it.
Thank you:)

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Kukuh Priambodo
Kukuh Priambodo 2016-12-3
编辑：Kukuh Priambodo 2016-12-3
fs = 10000; [x,fs] = audioread (fname); % input your file :) Wn = .35; N = 57; LP = fir1(N,Wn); [H_x,w]=freqz(LP); len_f=length(H_x); f=1/len_f:1/len_f:1; plot(f,20*log10(abs(H_x))); grid
%thanks

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回答（1 个）

Jan
Jan 2012-2-4

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Perhaps this helps:
[Signal, Fs] = wavread(filename);
[B, A] = butter(4, (2 / Fs) * 500, 'low');
Filtered = filter(B, A, Signal);

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olivia
olivia 2012-2-4
Thank you very much for the help but this is a butterworth filter which is not an FIR filter. I need to use a digital FIR filter. It would be very helpful if you have any idea about it.
Thanks
Jan
Jan 2012-2-5
How are the parameters of the FIR filter defined?

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