Changing Y limit of spectogram

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SS 2017-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/333633-changing-y-limit-of-spectogram

回答： Farid 2021-4-4

Hi, I am drawing spectogram of a sound signal by the following code:

spectrogram(seg,segmentLength,noverlap,segmentLength,sample_freq,'yaxis');

This code generates a spectogram with y axis of 0 to 7 kHz. I want to change the y limit to 0 to 3 kHz. I have tried both of the following. But, they didn't work.

ylim([0 3]);
set(gca,'YLim',[0 3]);

Can you please tell me how to change the y limit of a spectogram. Thansk

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Aditya Rastogi 2021-3-13

spectrogram(my_sound, hann(int64(0.0256 * sampling_rate)), int64(0.0128 * sampling_rate),[0:20000],sampling_rate,'yaxis');

In this statement, I'm using a hanning window with half overlap. Here, the parameter [0:20000] (denoted by f in the documentation), is the range of frequencies I want in the spectrogram.

In your case, you need to pass [0:3000] to this parameter.

Farid 2021-4-4