How do pitch transposers work?

  • Thread starter Thread starter Gunther
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Gunther

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I was dicking around with my efx processor and I noticed that it can raise and lower the pitch of my voice pretty good. How is it doing this? It can’t just be speeding up or slowing down the sound, since then the affected sound would either be longer or shorter than the original.

To make the pitch go up does it speed up the wave and then sample it and repeat it, to remove the gap in time? That doesn’t seem right, that would probably sound like crap.

So who knows what the deal is?
 
you're right ... simply resampling would change the length of the source.

as i undestand it .... the software continually detects the immediate wave period, and stores one period. an independant process pulls the current single-period waveform out at a different rate and plays it back. this helps to minimize the "chipmunk" effect, which occurs when formant frequencies are pitch-shifted along with the fundamental tone of the song. (formant frequencies are what we use to differentiate between vowels, etc.)
 
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