How to draw a high-contrast spectrogram?

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zhehao.nkd
zhehao.nkd 2021-5-26
回答： Andres Morales 2023-1-22
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.
Figure-1 A spectrogram generated by matlab function spectrogram()
Figure-2 A spectrogram of the same audio signal generated by a software

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回答（2 个）

Andres Morales
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
Sulaymon Eshkabilov
Hi,
Use colormap()
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zhehao.nkd
zhehao.nkd 2021-5-31
Thank you for your reply! But I am sorry that the way I ask my question may be misleading. Increasing the contrast by applying different colormaps may not be what I need. Instead, I would like to improve the contrast by cleaning the noisy background as the second Figure shows. Is there any possible solution?

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