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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.
For example, a pitch shifter set to increase the pitch by a fourth will raise each note three diatonic intervals above the notes actually played. Simple pitch shifters raise or lower the pitch by one or two octaves, while more sophisticated devices offer a range of interval alterations. Pitch shifters are included in most audio processors today.
The computer algorithm allows frequency-domain modifications to a digital sound file (typically time expansion/compression and pitch shifting). At the heart of the phase vocoder is the short-time Fourier transform (STFT), typically coded using fast Fourier transforms.
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The first mass-market digital pitch shifter was the DigiTech Whammy, introduced in 1989. [99] It creates a "strange and artificial" sound, with distinctive "wobbly" artifacts . [ 100 ] [ 101 ] Its users include Jonny Greenwood and Ed O'Brien of Radiohead , [ 102 ] [ 103 ] Matt Bellamy of Muse , [ 104 ] Tom Morello of Rage Against the Machine ...
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The DigiTech Whammy uses digital processing to raise or lower the pitch of an audio signal by up to two octaves. [1] The degree of shift is controlled by a treadle. [2] Users can set pitch-shifting intervals, add harmony, or detune the signal for a chorus-like effect. [2] The first model was introduced in 1989. [2]
PSOLA (Pitch Synchronous Overlap and Add) is a digital signal processing technique used for speech processing and more specifically speech synthesis. It can be used to modify the pitch and duration of a speech signal. It was invented around 1986. [2] PSOLA works by dividing the speech waveform in small overlapping segments.