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From: Clement Lim on 10 Sep 2009 21:54
Hi All,

I am trying to plot the frequency spectrum of a mp3 file with the following code, but i kept encounting the following error:

??? Output argument "out" (and maybe others) not assigned during call to
"C:\Users\User\Documents\MATLAB\mp3read.m (mp3read)".

Below is my source code. Can anyone advise? Tks

[filename, pathname] = uigetfile('*.*', 'Pick any file');
[Y,FS,NBITS,encoding_info,tag_info,out] = mp3read(filename);
disp('Playing at the original sample rate.');
sound(y, fs);
disp(fs);
specgram(y);
pause;
Y = fft(y);
plot(abs(Y));
xlabel('Frequency');
ylabel('Magnitude');
axis([0 length(Y)/2, 0 max(abs(Y))]);
pause
[nSamples,nChannels]=size(y);
waveFileLength=nSamples/fs;
N = 2^(nextpow2(length(y(:,1))));
Py=fft(y(:,1),N);
NumUniquePts = ceil((N+1)/2);
Py = Py(1:NumUniquePts);
Py = abs(Py);
Py = Py/length(y(:,1));
Py = Py.^2;
Py = Py*2;
Py(1) = Py(1)/2;
if ~rem(N,2)
Py(end) = Py(end)/2;
end
f = (0:NumUniquePts-1)*fs/N;
plot(f,Py);
title(sprintf('Power Spectrum of mp3 file. Length=%3.1f sec, Fs=%d Sample/sec',waveFileLength, fs));
xlabel('Frequency(Hz)');
ylabel('Power');
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