Talk:Pitch shifter

Implementation

How do these work? In the frequency domain, it seems that there is no intrinsic difference between "pitch" and "speed" that it is a timescale issue for human perception. In frequency space, then, does this filter change the frequency of all components over 20Hz and not touch the ultra-low-frequency components (which I assume would make up the rhythm)? ―BenFrantzDale 05:29, 16 February 2006 (UTC)[reply]

There are a number of different techniques in use; one is to take slices at 10-20 Hz and (for downward pitch shift) stretch each slice slightly or (for upward pitch shift) squeeze each slice and repeat it, cross fading the distorted slices together. Another technique would be to work in the frequency domain -- do a very high resolution FFT, adjust all the bins from 20Hz up, and IFFT. I imagine formant correcting pitch shifters work that way, but since the unwashed masses think that autotune formant distortion sounds cool, no one cares about formant correction. Kaleja (talk) 08:52, 3 May 2008 (UTC)[reply]

Expand

This should be expanded to include guitar pedals, not just processors. -Saint41

Merge

Yes, I agree with whoever applied the "merge" suggestion: This article, and also Pitch correction, should be merged into Pitch shift. They're all basically the same thing, and with these three articles combined it would make a great article. --mcld 10:54, 20 April 2007 (UTC)[reply]

and when we do, let's please remove the self serving Grindcore / goregrind references which have nothing whatsoever to do with the study of pitch shifting. DavesPlanet (talk) 17:57, 15 February 2010 (UTC)[reply]