How can I Plot a simple linear plot of sound pressure v/s frequency from an audio track?

I need to plot power v/s frequency (Hz) simple 2-d plots of an audio file.

Answer 1

[Star Strider]

Us e the fft (link) function.

The full code would go something like this:

filename = 'YourFile.wav';
[y,Fs] = audioread(filename);                   % Import File
N = size(y,1);                                  % Assuming Column Vectors
t = linspace(0, N, N)/Fs;                       % Time Vector (If Necessary)
Fn = Fs/2;                                      % Nyquist Frequency
Fy = fft(y)/N;
Fv = linspace(0, 1, fix(N/2)+1)*Fn;             % Frequency Vector
Iv = 1:numel(Fv):                               % Index Vector

figure
plot(Fv, abs(Fy(Iv,:))*2)
grid

[AKSHAT NEGI]

Thank you very much. Also I have multiple tracks and i need to plot all of them in one , Can that be done?

[Star Strider]

My pleasure.

I am not certain what you want to do.

You can certainly plot them, although I would plot each track in a separate axes, probably using the subplot function. You can make all the frequency vectors the same by using the second ‘NFFT’ argument to the fft funciton.