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How to convert Normalized frequency back to Frequency on the graph

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Dear All,
I need to change the Y-axis unit on this graph back to frequency[HZ], I'd really appreciate your answers.
Thank you in advance.

Accepted Answer

Farid on 15 Feb 2021
I should have set the frequency range to solve this problem.
spectrogram(x,window,noverlapp,nfft,'yaxis',frequency range);

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