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Re: pitch

Hi Brittany,

I don't know about Garage Band, but Audacity uses an algorithm called soundtouch, which is an implementation of the synchronous-overlap-add method. Here is a link to the library used, and there is a link on this page to a nice discussion by the author of how it works:



On 8/11/2011 11:11 AM, Brittany Guidone wrote:
Dear List,

Does anyone know what happens in Garage Band or Audacity when you change the pitch of a voice in
those programs? The voices are not getting faster or slower when I change them 4 semi tones. But I
want to know what is being done to the voices when I change the pitch.

-Brittany Guidone

Christopher Brown, Ph.D.
Associate Research Professor
Department of Speech and Hearing Science
Arizona State University