When i compute NMF over a spectrogram (mag of stft of a signal ) i obtain
W,H = NMF(MyStft,r) # where r=2 is the rank
W and H will respectively contain the spectrum and the temporal information.
My question is why? whats the logic behind that
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Rebecca20
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https://dsp.stackexchange.com – Jdip Aug 31 '22 at 02:00
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STFT is already a time frequency representation, so it's not a surprise that NMF would also yield some time AND frequency content... I suggest you read about NMF in music information retrieval context first ([for example](https://musicinformationretrieval.com/nmf.html)), and come back with more precise questions... – Jdip Aug 31 '22 at 02:03