87 lines
1.8 KiB
Text
87 lines
1.8 KiB
Text
|
#lang scribble/manual
|
||
|
|
@(require (for-label racket))
|
||
|
|
|
||
|
|
@title{BufDelayL}
|
||
|
|
Buffer based simple delay line with linear interpolation.@section{related}
|
||
|
|
Classes/BufDelayC, Classes/BufDelayN, Classes/DelayL
|
||
|
|
@section{categories}
|
||
|
|
UGens>Delays>Buffer
|
||
|
|
|
||
|
|
|
||
|
|
@section{description}
|
||
|
|
|
||
|
|
|
||
|
|
Simple delay line with linear interpolation which uses a buffer for its
|
||
|
|
internal memory. See also link::Classes/BufDelayN:: which uses no
|
||
|
|
interpolation, and link::Classes/BufDelayC:: which uses cubic
|
||
|
|
interpolation. Cubic interpolation is more computationally expensive
|
||
|
|
than linear, but more accurate.
|
||
|
|
|
||
|
|
|
||
|
|
@section{classmethods}
|
||
|
|
|
||
|
|
|
||
|
|
@section{method}
|
||
|
|
ar, kr
|
||
|
|
|
||
|
|
@section{argument}
|
||
|
|
buf
|
||
|
|
Buffer number.
|
||
|
|
|
||
|
|
@section{note}
|
||
|
|
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.::
|
||
|
|
|
||
|
|
@section{argument}
|
||
|
|
in
|
||
|
|
The input signal.
|
||
|
|
|
||
|
|
@section{argument}
|
||
|
|
delaytime
|
||
|
|
Delay time in seconds.
|
||
|
|
|
||
|
|
@section{discussion}
|
||
|
|
|
||
|
|
@section{Warning}
|
||
|
|
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.
|
||
|
|
::
|
||
|
|
|
||
|
|
@section{Examples}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
@racketblock[
|
||
|
|
|
||
|
|
// allocate buffer
|
||
|
|
b = Buffer.alloc(s,44100,1);
|
||
|
|
|
||
|
|
(
|
||
|
|
// Dust randomly triggers Decay to create an exponential
|
||
|
|
// decay envelope for the WhiteNoise input source
|
||
|
|
{
|
||
|
|
z = Decay.ar(Dust.ar(1,0.5), 0.3, WhiteNoise.ar);
|
||
|
|
BufDelayL.ar(b.bufnum, z, 0.2, 1, z); // input is mixed with delay via the add input
|
||
|
|
}.play
|
||
|
|
)
|
||
|
|
|
||
|
|
b.free;
|
||
|
|
|
||
|
|
|
||
|
|
// multichannel
|
||
|
|
|
||
|
|
// two channels, two buffers
|
||
|
|
b = Buffer.allocConsecutive(2, s, 32768, 1);
|
||
|
|
|
||
|
|
a = { |bufs = #[0, 1]|
|
||
|
|
var sig = SinOsc.ar([440, 880]) * Decay2.kr(Impulse.kr([2, 4]), 0.01, 0.15);
|
||
|
|
sig + BufDelayL.ar(bufs, sig, delaytime: 0.125)
|
||
|
|
}.play(args: [bufs: b]);
|
||
|
|
|
||
|
|
a.free;
|
||
|
|
b.do(_.free);
|
||
|
|
|
||
|
|
::
|
||
|
|
|
||
|
|
]
|
||
|
|
|
||
|
|
|