How to draw a high-contrast spectrogram?
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Some software for sound analysis can draw spectrograms with higher contrast (backgrounds are almost zero). I was wondering what tricks may I use to generate similar spectrograms.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/630455/image.png)
Figure-1 A spectrogram generated by matlab function spectrogram()
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/630460/image.png)
Figure-2 A spectrogram of the same audio signal generated by a software
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Andres Morales
2023-1-22
You can modify the spectrogram minimum thresholding value. This will zero values below the threshold:
https://www.mathworks.com/help/signal/ref/spectrogram.html#namevaluepairarguments
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