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How to plot spectrogram with actual time?

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Niklas Kurz
Niklas Kurz il 19 Gen 2021
Modificato: Niklas Kurz il 19 Gen 2021
I've tried a plenty of time now, awaring that there are many solution on the web, but none of them were working fine for my Issue.
Say I have the data
[y,fs] = audioread('path');
In order to prepare it for spectrogram:
y = y(:,1);
If I plot it now in a spectogram with same setting as on the Matlab-side:
spectrogram(y,128,120,128,1e3,'yaxis')
I'm getting a time-span of hours, even if the Signal is 140 seconds long.
Any solutions? The spectogram looks fancy, but not in that scale.

Risposte (1)

Niklas Kurz
Niklas Kurz il 19 Gen 2021
Modificato: Niklas Kurz il 19 Gen 2021
gosh,
spectrogram(y,128,120,128,fs,'yaxis')
% colormap(jet); (optional optic)
if your Data is really large and scaled in minutes you can use:
[~,F,T,P] = spectrogram(y,128,120,128,fs,'yaxis');
imagesc(T, F, 10*log10(P+eps)) % add eps like pspectrogram does
axis xy
ylabel('Frequency (Hz)')
xlabel('Time (s)')
h = colorbar;
h.Label.String = 'Power/frequency (dB/Hz)';
According to Stack exchange. Thank you documentations!

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