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class:: SOS
summary:: Second order filter section (biquad).
related:: Classes/FOS
categories:: UGens>Filters>Linear
Description::
A standard second 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)) + (a2 * in(i-2)) + (b1 * out(i-1)) + (b2 * out(i-2))
::
classmethods::
method::ar, kr
argument::in
signal input
argument::a0
See formula above.
argument::a1
See formula above.
argument::a2
See formula above.
argument::b1
See formula above.
argument::b2
See formula above.
argument::mul
argument::add
Examples::
code::
// example: same as TwoPole
(
{
var rho, theta, b1, b2;
theta = MouseX.kr(0.2pi, pi);
rho = MouseY.kr(0.6, 0.99);
b1 = 2.0 * rho * cos(theta);
b2 = rho.squared.neg;
SOS.ar(LFSaw.ar(200, 0, 0.1), 1.0, 0.0, 0.0, b1, b2)
}.play
)
(
{
var rho, theta, b1, b2;
theta = MouseX.kr(0.2pi, pi);
rho = MouseY.kr(0.6, 0.99);
b1 = 2.0 * rho * cos(theta);
b2 = rho.squared.neg;
SOS.ar(WhiteNoise.ar(0.1 ! 2), 1.0, 0.0, 0.0, b1, b2)
}.play
)
// example with SOS.kr kr as modulator
(
{
var rho, theta, b1, b2, vib;
theta = MouseX.kr(0.2pi, pi);
rho = MouseY.kr(0.6, 0.99);
b1 = 2.0 * rho * cos(theta);
b2 = rho.squared.neg;
vib = SOS.kr(LFSaw.kr(3.16), 1.0, 0.0, 0.0, b1, b2);
SinOsc.ar( vib * 200 + 600) * 0.2
}.play
)
::
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