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Hi Brittany,
Most forms of pitch-shifting shift the fundamental and all harmonic
frequencies proportionally.  So when you shift the F0 of a male speaker up
by 4 semitones, it will sound like the voice of a person with a higher
pitched voice. It will sound very natural and understandable.

I don't know how audacity or garage band would do the shifting; they may
do it differently than other commercial devices, but you could easily
measure the signals before and after to determine which frequencies (F0
and harmonics) were shifted.

Best regards,


On 9/6/11 10:56 AM, "Brittany Guidone" <brittanyguidone@xxxxxxxxx> wrote:

>Dear List,
>To explain more about my original question:
>I mainly want to know if "morphing" or "changing" the pitch of a male
>voice by positive 4 semi tones will change the components of the original
>male voice (before it was morphed) in a way that will make the two voices
>have different components or "make up" in comparison to one another,
>besides the fact that they will have different pitches.
>In other words, when the pitch of a voice is changed in audacity or
>garage band then what other components of the voice are changed (besides
>the pitch shift)? 
>Sent from my Verizon Wireless BlackBerry