MATLAB: I want to plot frequency vs time from the sound data(i.e. column data). I am not able to do it. Please please help. the specgramdemo function when run give at what time what frequency is present, but i want that it should return mtrx frequency vs t

spectrogram

If i use the spectrogram function, it plots the spectrogram i.e. it plots frequency vs time but, i am not able to extract that information in to matrix. Please help.

Best Answer

spectrogram returns matrices containing the complex-valued short-time Fourier transform and the short-time periodograms.

See the help for spectrogram for examples.

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Try this:

% Plot FFT signal
N = pow2(nextpow2(length(signal)));
y = fft(signal,N)/length(signal);
Fn = Fs/2;
Fv = linspace(0, 1, fix(length(y)/2)+1)*Fn;
Iv = 1:length(Fv);
plot(Fv,abs(y(Iv))*2);
title('FFT');
xlabel('Frequency [Hertz]');
ylabel('Magnitude');

NOTE — I have not tested this. It should work.

Best Answer

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MATLAB: DECODING OF DIAL TONE SIGNAL

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