Anthony Koning asked . 2024-03-18

How to put an audio file through a filter made through matlab

Hi, I'm wondering how I can place a sound file through a filter that I made through Matlab. The code works, I'm just wondering how to inject the audio file through the filter itself. I believe it should be some application of the fir1 command, though I'm not sure how to impliment it fully. The code is as follows:

Fl = 300 
Fh = 3400 
Samples = 44100
Wc = [Fl Fh]./Samples 
bbp = fir1(256, Wc, 'band');
figure(1)
plot (1:length(bbp), bbp)
figure(2)
freqz(bbp,1)
outbp = filter(bbp,1,y);
audioread('song.wav');
info = audioinfo('song.wav')
filename = 'song.wav';
[y,Fs] = audioread('song.wav');
audiowrite(filename,y,Fs);
sound(y,Fs)

And I am looking to filter song.wav with the bandpass filter I made, rather than the default fir1 command one. Thanks for the help

Signal Processing , Audio Toolbox , filter , fir1 , MATLAB

Expert Answer

John Michell answered . 2024-12-21 00:27:22

hello

some corrections needed, but you were pretty close to the solution

[y,Fs] = audioread('song.wav');
Fl = 300; 
Fh = 3400; 
Wc = [Fl Fh].*(2/Fs); 
bbp = fir1(256, Wc, 'band');
figure(1)
plot (1:length(bbp), bbp)
figure(2)
freqz(bbp,1)
outbp = filter(bbp,1,y);
audiowrite('song_filtered.wav',outbp,Fs);
sound(outbp,Fs)

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