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This Post Has Been Edited by the Author
In Reply to: RE: Yup, I meant the Alvin effect posted by Chris from Lafayette on September 12, 2015 at 23:09:13
Or to say this another way, the harmonic structure of a voice played back too fast of a speed is different from the harmonic structure of the same voice singing sharp at the same pitch..... Unless the singer inhales helium, the "Alvin" effect is never present in the latter case. But it is always present in the former. It doesn't matter whether the recording is analog or digital. As long as it's otherwise unadulterated.(Although digital recording is almost always the correct speed throughout the process. From recording session to final product. It is almost impossible to vary the pitch digitally without otherwise mangling the signal. The only clean way to do this is vary the clock speed of the playback.)
That said, there are so many processing options in the digital realm to doctor recordings. Including making the time faster or slower without changing pitch. (No "Alvin" effect occurs if the pitch is the same. Although other strange artifacts are introduced.) I wouldn't be shocked if there was an app out there that even removes the "Alvin" effect from recordings encoded "fast" relative to the original.
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Edits: 09/13/15Follow Ups: