Audio time stretching and pitch scaling information
Changing the speed or duration of an audio signal without affecting its pitch
"Timestretch" redirects here. For the album, see Timestretch (album).
Time stretching is the process of changing the speed or duration of an audio signal without affecting its pitch. Pitch scaling is the opposite: the process of changing the pitch without affecting the speed. Pitch shift is pitch scaling implemented in an effects unit and intended for live performance. Pitch control is a simpler process which affects pitch and speed simultaneously by slowing down or speeding up a recording.
These processes are often used to match the pitches and tempos of two pre-recorded clips for mixing when the clips cannot be reperformed or resampled. Time stretching is often used to adjust radio commercials[1] and the audio of television advertisements[2] to fit exactly into the 30 or 60 seconds available. It can be used to conform longer material to a designated time slot, such as a 1-hour broadcast.
^"Dolby, The Chipmunks And NAB2004". Archived from the original on 2008-05-27. {{cite magazine}}: Cite magazine requires |magazine= (help)
^"Variable speech". www.atarimagazines.com.
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