When using this method, the frequencies in the recording are always scaled at the same ratio as the speed, transposing its perceived pitch up or down in the process. For a digital audio recording, this can be accomplished through sample rate conversion. The simplest way to change the duration or pitch of an audio recording is to change the playback speed. It can be used to conform longer material to a designated time slot, such as a 1-hour broadcast. Time stretching is often used to adjust radio commercials and the audio of television advertisements to fit exactly into the 30 or 60 seconds available. 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. Pitch control is a simpler process which affects pitch and speed simultaneously by slowing down or speeding up a recording. Pitch shift is pitch scaling implemented in an effects unit and intended for live performance. Pitch scaling is the opposite: the process of changing the pitch without affecting the speed. Time stretching is the process of changing the speed or duration of an audio signal without affecting its pitch.
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