I read a lot of articles and discussions about FFT and algorithms about pitch detection (autocorrelation, overlapping windows, HPS...). When we play the piano so there are not only one frequency but many - high and low frequencies, so what is the best method for piano?
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I dont know much about what you are trying to do, but it seems to me you need to run some high pass and low pass filters, isolate your data set so you can get the pitch from the noise. Piano has many frequencies to give you the tonal characteristics of its sound, but if you only care about pitch, (the exact note being hit) then the rest of the waveform is noise to you. Hope this helps.