87 lines
1.8 KiB
Text
87 lines
1.8 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{BufDelayC}
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Buffer based simple delay line with cubic interpolation.@section{related}
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Classes/BufDelayL, Classes/BufDelayN, Classes/DelayC
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@section{categories}
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UGens>Delays>Buffer
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@section{description}
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Simple delay line with cubic interpolation which uses a buffer for its
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internal memory. See also link::Classes/BufDelayN:: which uses no
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interpolation, and link::Classes/BufDelayL:: which uses linear
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interpolation. Cubic interpolation is more computationally expensive
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than linear, 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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buf
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Buffer number.
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@section{note}
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The buffers provided to any of the BufDelay units must be one channel. If you want to delay a multichannel signal, you must provide as many separate (one-channel) buffers as there are input channels.::
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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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delaytime
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Delay time in seconds.
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@section{discussion}
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@section{Warning}
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For reasons of efficiency, the effective buffer size is limited to the previous power of two. So, if 44100 samples are allocated, the maximum delay would be 32768 samples.
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::
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@section{Examples}
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@racketblock[
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// allocate buffer
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b = Buffer.alloc(s,44100,1);
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(
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// Dust randomly triggers Decay to create an exponential
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// decay envelope for the WhiteNoise input source
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{
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z = Decay.ar(Dust.ar(1,0.5), 0.3, WhiteNoise.ar);
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BufDelayC.ar(b.bufnum, z, 0.2, 1, z); // input is mixed with delay via the add input
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}.play
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)
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b.free;
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// multichannel
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// two channels, two buffers
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b = Buffer.allocConsecutive(2, s, 32768, 1);
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a = { |bufs = #[0, 1]|
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var sig = SinOsc.ar([440, 880]) * Decay2.kr(Impulse.kr([2, 4]), 0.01, 0.15);
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sig + BufDelayC.ar(bufs, sig, delaytime: 0.125)
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}.play(args: [bufs: b]);
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a.free;
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b.do(_.free);
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::
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]
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