Subject: Re: Pitch Shifting Algorithm From: lazzaro <lazzaro@xxxxxxxx> Date: Mon, 26 Jun 2006 11:27:08 -0700On Jun 25, 2006 Ben Hornsby <ben.hornsby@xxxxxxxx> wrote: > I've had a request from someone in our department for suggestions > for a = > pitch shifting algorithm that will be used to shift the frequencies > of = > phoneme pairs (e.g. ba-da) into the center range of rat hearing > (~8kHz) = > without affecting the temporal cues of the speech stimuli. I'm = > unfamiliar with available software to do this (and pros and cons for = > specific kinds). We do have some commercial software here such as > Adobe = > Audition and SoundForge that have pitch shifting algorithms as part > of = > their software package. We are hoping to limit artifact as much as = > possible. Would these be appropriate algorithms to use? If not, why > not = > and any suggestions as to which software program would be more = > appropriate? Take a look at Celemony Melodyne -- it's a sound editor that lets you tune-up the pitch, time, and formants of monophonic sources. Review here (of 2.0 -- they're up to 3.0 now): http://www.soundonsound.com/sos/jan04/articles/melodyne2.htm If it looks like it can do what you want, try downloading the demo version of Celemony Melodyne Studio: http://www.celemony.com/cms/index.php?id=demos or maybe reading more info about the formant processing part of the program in their manuals: http://www.celemony.com/cms/index.php?id=manuals In the recording studio world, Melodyne is what folks grab when automated solutions for re-pitching sounds (Auto-Tune, TC Intonator) don't work. Good luck, --- John Lazzaro http://www.cs.berkeley.edu/~lazzaro lazzaro [at] cs [dot] berkeley [dot] edu ---