Plot the STFT spectrogram

2020 7 11
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更新时间：2020 7 12
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How to get that 2D image in the figure, please? It is taken from a STFT tutorial in Matlab.

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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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