I'm trying to find abrupt changes in the spectrogram of an audio using the findchangepts function. However, every time I get the error: Expected input number to be finite.

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Yaminah Shafique on 8 Dec 2022

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Answered: Walter Roberson on 8 Dec 2022

[y, Fs] = audioread('vocals.wav');
findchangepts(y,'MaxNumChanges',10,'Statistic','rms')
[s,f,t,pxx] = spectrogram(y,128,120,128,Fs, 'yaxis');
findchangepts(pow2db(pxx),'MaxNumChanges',50)

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Answer 1

Walter Roberson on 8 Dec 2022

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Suppose that somehow one of the output powers in pxx were exactly 0. Then pow2db() would be -inf there, but findchangeptrs() cannot accept infinite inputs.