Re: Pitch Shifting Algorithm

[lazzaro <lazzaro@xxxxxxxxxxxxxxxxx>]

On Jun 25, 2006  Ben Hornsby <ben.hornsby@xxxxxxxxxxxxxx> 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
---