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Re: Pitch Shifting Algorithm
Ben, your question is somewhat unanswerable. Since spectral and
temporal structure of sounds are interlocked, and you'd like to
change one without messing up the other, you need to decide exactly
what aspects you don't want to mess up. Essentially, you fit a model
of the sound, based on perception, modify the parameters, and
re-synthesize. For ba/da discrimination, you need to fit a model
that includes fast formant transitions, I suppose, with an analysis
tuned to human perception and a re-synthesis tuned to rat perception.
Sorry I don't have a more constructive answer.
At 7:33 PM -0500 6/25/06, Ben Hornsby 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?