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Pitch of an audio signal representing a musical note, measured in units of octave and relative to a pitch standard such as A440, is the base-2 logarithm of the frequency ratio of the fundamental frequency of the note to the frequency of the pitch standard.
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Implementing a pitch shifter
When the author said pitch shifting, in reality, it seems that he is doing pitch scaling and it looks like he didn't care if some frequency content is scaled out of bound, he just ignores them. … It generally shifts the spectrum the way I wanted, but it is nowhere close to the pitch-shifted version as in the experiment I wanted to reproduce. …