spectrogram plotting of Amplitude frequency vs. frame

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Mona 2014-12-14

评论： Star Strider 2014-12-15

Hi,

I used spectrogram matlab function in order to obtain a STFT as follows:

nfft=1024;
noverlap=nfft/2;
wnd= hamming(nfft,'periodic');
[Y, F, T, P] = spectrogram (y, wnd, noverlap, nfft, fs);

Now, I am trying to plot a 3D plot of frequency , amplitude for each frame I have. can anyone help please.

Thanks in advance

Star Strider 2014-12-14

From the documentation for spectrogram:

spectrogram(...) plots the PSD estimate for each segment on a surface in a figure window. The plot is created using

surf(T,F,10*log10(abs(P)));
axis tight;
view(0,90);

So to get your 3D plot, simply comment out (or remove) the view(0,90) call, or change it to a different azimuth and elevation.

Mona 2014-12-14

Great!!!!! mesh worked much better than surf.... Thanks alot

Star Strider 2014-12-15

My pleasure!

I use mesh frequently when surf is too dense.

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