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class:: FOS
summary:: First order filter section.
related:: Classes/SOS
categories:: UGens>Filters>Linear
Description::
A standard first order filter section. Filter coefficients are given
directly rather than calculated for you. Formula is equivalent to:
code::
out(i) = (a0 * in(i)) + (a1 * in(i-1)) + (b1 * out(i-1))
::
classmethods::
method::ar, kr
argument::in
Signal input.
argument::a0
See formula above.
argument::a1
See formula above.
argument::b1
See formula above.
argument::mul
argument::add
Examples::
code::
(
// same as OnePole
{ var x;
x = LFTri.ar(0.4, 0, 0.99);
FOS.ar(LFSaw.ar(200, 0, 0.2), 1 - x.abs, 0.0, x)
}.play;
)
(
// same as OneZero
{ var x;
x = LFTri.ar(0.4, 0, 0.99);
FOS.ar(LFSaw.ar(200, 0, 0.2), 1 - x.abs, x, 0.0)
}.play;
)
(
// same as OnePole, kr
{ var x, ctl;
x = LFTri.kr(0.2, 0, 0.99);
ctl = FOS.kr(LFSaw.kr(8, 0, 0.2), 1 - x.abs, 0.0, x);
LFTri.ar(ctl * 200 + 500);
}.play;
)
::
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