Plot the STFT spectrogram

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How to get that 2D image in the figure, please? It is taken from a STFT tutorial in Matlab.

Accepted Answer

Thiago Henrique Gomes Lobato
The function tutorials of matlab normally give code examples and results. For you to reproduce the result you just need to run the exactly same given code. In this case, just copy the code lines before and you will get the same picture:
fs = 10e3;
t = 0:1/fs:2;
x = vco(sin(2*pi*t),[0.1 0.4]*fs,fs);
stft(x,fs,'Window',kaiser(256,5),'OverlapLength',220,'FFTLength',512);

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