HelpSource/Classes/BufCombL.schelp

   1 class:: BufCombL
   2 summary:: Buffer based comb delay line with linear interpolation.
   3 related:: Classes/BufCombC, Classes/BufCombN, Classes/CombL
   4 categories::  UGens>Delays>Buffer
   5
   6
   7 Description::
   8
   9 Comb delay line with linear interpolation which uses a buffer for its
  10 internal memory. See also  link::Classes/BufCombN::  which uses no
  11 interpolation, and  link::Classes/BufCombC::  which uses cubic
  12 interpolation. Cubic interpolation is more computationally expensive
  13 than linear, but more accurate.
  14
  15
  16 classmethods::
  17
  18 method::ar
  19
  20 argument::buf
  21 Buffer number.
  22
  23 argument::in
  24 The input signal.
  25
  26 argument::delaytime
  27 Delay time in seconds.
  28
  29 argument::decaytime
  30 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.
  31
  32 discussion::
  33 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.
  34 ::
  35
  36 Examples::
  37
  38 code::
  39
  40 // These examples compare the variants, so that you can hear the difference in interpolation
  41
  42 // allocate buffer
  43 b = Buffer.alloc(s,44100,1);
  44
  45 // Comb used as a resonator. The resonant fundamental is equal to
  46 // reciprocal of the delay time.
  47 { BufCombN.ar(b.bufnum, WhiteNoise.ar(0.01), XLine.kr(0.0001, 0.01, 20), 0.2) }.play;
  48
  49 { BufCombL.ar(b.bufnum, WhiteNoise.ar(0.01), XLine.kr(0.0001, 0.01, 20), 0.2) }.play;
  50
  51 { BufCombC.ar(b.bufnum, WhiteNoise.ar(0.01), XLine.kr(0.0001, 0.01, 20), 0.2) }.play;
  52
  53 // with negative feedback:
  54 { BufCombN.ar(b.bufnum, WhiteNoise.ar(0.01), XLine.kr(0.0001, 0.01, 20), -0.2) }.play;
  55
  56 { BufCombL.ar(b.bufnum, WhiteNoise.ar(0.01), XLine.kr(0.0001, 0.01, 20), -0.2) }.play;
  57
  58 { BufCombC.ar(b.bufnum, WhiteNoise.ar(0.01), XLine.kr(0.0001, 0.01, 20), -0.2) }.play;
  59
  60 // used as an echo.
  61 { BufCombL.ar(b.bufnum, Decay.ar(Dust.ar(1,0.5), 0.2, WhiteNoise.ar), 0.2, 3) }.play;
  62
  63 ::
  64