93 lines
2 KiB
Racket
93 lines
2 KiB
Racket
#lang scribble/manual
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@(require (for-label racket))
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@title{AllpassC}
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All pass delay line with cubic interpolation.@section{related}
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Classes/AllpassL, Classes/AllpassN, Classes/BufAllpassC
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@section{categories}
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UGens>Delays
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@section{description}
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All pass delay line with cubic interpolation. See also
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link::Classes/AllpassN:: which uses no interpolation, and
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link::Classes/AllpassL:: which uses linear interpolation.
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Cubic interpolation is more computationally expensive than linear,
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but more accurate.
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@section{classmethods}
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@section{method}
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ar, kr
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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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maxdelaytime
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The maximum delay time in seconds. Used to initialize the delay buffer size.
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@section{argument}
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delaytime
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Delay time in seconds.
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@section{argument}
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decaytime
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Time for the echoes to decay by 60 decibels. If this time is negative then the feedback coefficient will be negative, thus emphasizing only odd harmonics at an octave lower.
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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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// Since the allpass delay has no audible effect as a resonator on
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// steady state sound ...
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{ AllpassC.ar(WhiteNoise.ar(0.1), 0.01, XLine.kr(0.0001, 0.01, 20), 0.2) }.play;
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// ...these examples add the input to the effected sound and compare variants so that you can hear
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// the effect of the phase comb:
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(
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{
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z = WhiteNoise.ar(0.2);
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z + AllpassN.ar(z, 0.01, XLine.kr(0.0001, 0.01, 20), 0.2)
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}.play)
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(
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{
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z = WhiteNoise.ar(0.2);
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z + AllpassL.ar(z, 0.01, XLine.kr(0.0001, 0.01, 20), 0.2)
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}.play)
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(
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{
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z = WhiteNoise.ar(0.2);
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z + AllpassC.ar(z, 0.01, XLine.kr(0.0001, 0.01, 20), 0.2)
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}.play)
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// used as an echo - doesn't really sound different than Comb,
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// but it outputs the input signal immediately (inverted) and the echoes
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// are lower in amplitude.
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{ AllpassC.ar(Decay.ar(Dust.ar(1,0.5), 0.2, WhiteNoise.ar), 0.2, 0.2, 3) }.play;
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::
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]
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