How to draw a high-contrast spectrogram?

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zhehao.nkd 2021-5-26

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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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Answer 1

Sulaymon Eshkabilov 2021-5-26

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Hi,

Use colormap()

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Sulaymon Eshkabilov 2021-5-26

colormap(jet); colormat(hsv); etc

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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