126 lines
1.9 KiB
Text
126 lines
1.9 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{PitchShift}
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Time domain pitch shifter.@section{categories}
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UGens>Filters>Pitch
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@section{description}
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A time domain granular pitch shifter. Grains have a triangular amplitude
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envelope and an overlap of 4:1.
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@section{classmethods}
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@section{method}
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ar
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@section{argument}
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in
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The input signal.
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@section{argument}
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windowSize
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The size of the grain window in seconds. This value cannot be
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modulated.
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@section{argument}
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pitchRatio
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The ratio of the pitch shift. Must be from 0 to 4.
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@section{argument}
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pitchDispersion
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The maximum random deviation of the pitch from the
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@racketblock[pitchRatio:: .
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]
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@section{argument}
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timeDispersion
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A random offset of from zero to
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@racketblock[timeDispersion:: seconds is added to the
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delay of each grain. Use of some dispersion can alleviate a hard
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comb filter effect due to uniform grain placement. It can also be
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an effect in itself.
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]
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@racketblock[timeDispersion:: can be
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no larger than
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]
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@racketblock[windowSize:: .
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]
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@section{argument}
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mul
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Output will be multiplied by this value.
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@section{argument}
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add
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This value will be added to the output.
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@section{Examples}
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@racketblock[
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(
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play({
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z = Blip.ar(800, 6, 0.1);
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PitchShift.ar(z, 0.02, Line.kr(0.1,4,20), 0, 0.0001)
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}))
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(
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// pitch shift input - USE HEADPHONES to prevent feedback.
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play({
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PitchShift.ar(
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SoundIn.ar([0, 1]), // stereo audio input
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0.1, // grain size
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MouseX.kr(0,2), // mouse x controls pitch shift ratio
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0, // pitch dispersion
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0.004 // time dispersion
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)
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}))
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(
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// use PitchShift to granulate input - USE HEADPHONES to prevent feedback.
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// upper left corner is normal playback. x = pitch dispersion, y = time dispersion
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var grainSize;
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grainSize = 0.5;
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play({
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PitchShift.ar(
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SoundIn.ar([0, 1]),
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grainSize,
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1, // nominal pitch rate = 1
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MouseX.kr(0,1), // pitch dispersion
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MouseY.kr(0, grainSize) // time dispersion
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)
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}))
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::
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]
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