[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Pitch Shifting Algorithm



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 ---