SuperCollider CLASSES

FOS

First order filter section.
Inherits from: Filter : PureUGen : UGen : AbstractFunction : Object

Description

A standard first order filter section. Filter coefficients are given directly rather than calculated for you. Formula is equivalent to:

out(i) = (a0 * in(i)) + (a1 * in(i-1)) + (b1 * out(i-1))

Class Methods

*ar (in: 0, a0: 0, a1: 0, b1: 0, mul: 1, add: 0)

*kr (in: 0, a0: 0, a1: 0, b1: 0, mul: 1, add: 0)

Arguments:

in

Signal input.

a0

See formula above.

a1

See formula above.

b1

See formula above.

mul
add

Inherited class methods

Instance Methods

Inherited instance methods

Examples

(
// 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;
)