Audio timescale-pitch modification

Time stretching is the process of changing the speed or duration of an audio signal without affecting its pitch.

Related Topics:
Audio signal - Pitch

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Pitch scaling or pitch shifting is the reverse: the process of changing the pitch without affecting the speed. There are also more advanced methods used to change speed, pitch, or both at once, as a function of time.

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These processes are used, for instance, to match the pitches and tempos of two pre-recorded clips for mixing when the clips cannot be reperformed or resampled. (A drum track could be moderately resampled for tempo without adverse effects, but a pitched track could not). They are also used to create effects such as increasing the range of an instrument (like pitch shifting a guitar down an octave).

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