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You should do it all in the time domain. I wouldn't bother with any FFT. Not even to get autocorrelation. I have a couple of answers regarding using Average Squared Difference Function, which is a variation of the AMDF method. ASDF can be inverted to get a good autocorrelation function and then the issue is doing good peak-picking and tracking your pitch. ...


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A zero-padded FFT is not the best method for accurately estimating musical pitch in (near)real-time. I suggest researching other pitch detection/estimation algorithms (lots of literature and research papers), such as interpolated autocorrelation, AMDF, YAAPT, cepstrum, harmonic product, phase vocoder, and etc., and see if one of those algorithms better ...


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