/usr/share/SuperCollider/HelpSource/Classes/FBSineL.schelp is in supercollider-common 1:3.6.3~repack-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | class:: FBSineL
summary:: Feedback sine with chaotic phase indexing
categories:: UGens>Generators>Chaotic
related:: Classes/FBSineC, Classes/FBSineN
description::
A linear-interpolating sound generator based on the difference equations:
code::
x[n+1] = sin(im * y[n] + fb * x[n])
y[n+1] = (a * y[n] + c) % 2pi
::
warning:: reviser formulae conversion to c like code. ::
This uses a linear congruential function to drive the phase indexing of a sine wave. For code:: im = 1 ::, code:: fb = 0 ::, and code:: a = 1 :: a normal sinewave results.
classmethods::
method:: ar
argument:: freq
Iteration frequency in Hertz
argument:: im
Index multiplier amount
argument:: fb
Feedback amount
argument:: a
Phase multiplier amount
argument:: c
Phase increment amount
argument:: xi
Initial value of x
argument:: yi
Initial value of y
examples::
code::
// default initial params
{ FBSineL.ar(SampleRate.ir/4) * 0.2 }.play(s);
::
code::
// increase feedback
{ FBSineL.ar(SampleRate.ir, 1, Line.kr(0.01, 4, 10), 1, 0.1) * 0.2 }.play(s);
::
code::
// increase phase multiplier
{ FBSineL.ar(SampleRate.ir, 1, 0, XLine.kr(1, 2, 10), 0.1) * 0.2 }.play(s);
::
code::
// modulate frequency and index multiplier
{ FBSineL.ar(LFNoise2.kr(1, 1e4, 1e4), LFNoise2.kr(1,16,17), 1, 1.005, 0.7) * 0.2 }.play(s);
::
code::
// randomly modulate params
(
{ FBSineL.ar(
LFNoise2.kr(1, 1e4, 1e4),
LFNoise2.kr(1, 32, 33),
LFNoise2.kr(1, 0.5),
LFNoise2.kr(1, 0.05, 1.05),
LFNoise2.kr(1, 0.3, 0.3)
) * 0.2 }.play(s);
)
::
|