Variable-rate voice modulation effect

Time stretching is the process of changing, the speed or duration of a audio signal without affecting its pitch. Pitch scaling or Pitch shifting is the opposite:the process of changing, the Pitch without affecting the speed. Similar methods can change speed, pitch, or both at once, in a time-varying the.

These processes is used, for instance, to match the pitches and tempos of both pre-recorded clips for mixing when the clip s cannot be reperformed or resampled. (a drum track containing no pitched instruments could being moderately resampled for tempo without adverse effects, but a pit Ched track could not). They is also used to create effects such as increasing the range of an instrument (like pitch shifting a guitar under an O Ctave).

Not constant,variable pitch scale factor.

Original voice

The pitch-shifting factor is normalized over time.

Variable-rate voice modulation effect