Lowpass FIR filter code.

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:)

[Kukuh Priambodo]

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

Answer 1

[Jan]

Perhaps this helps:

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

[olivia]

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]

How are the parameters of the FIR filter defined?