Classes | UGens > Filters > Linear

Resonz : Filter : PureUGen : UGen : AbstractFunction : Object

Resonant filter.
Source: Filter.sc

Description

This is the same as Ringz , except that it has a constant gain at 0 dB instead of being constant skirt.

It is a two pole resonant filter with zeroes at

z = ±1

Based on K. Steiglitz, "A Note on Constant-Gain Digital Resonators", Computer Music Journal, vol 18, no. 4, pp. 8-10, Winter 1994.

Class Methods

Resonz.ar(in: 0, freq: 440, bwr: 1, mul: 1, add: 0)

Resonz.kr(in: 0, freq: 440, bwr: 1, mul: 1, add: 0)

Arguments:

in

The input signal.

freq

Resonant frequency in Hertz. WARNING: due to the nature of its implementation frequency values close to 0 may cause glitches and/or extremely loud audio artifacts!

bwr

Bandwidth ratio (reciprocal of Q). rq = bandwidth / centerFreq.

The reciprocal of Q is used rather than Q because it saves a divide operation inside the unit generator.

mul

Output will be multiplied by this value.

add

This value will be added to the output.

Inherited class methods

Instance Methods

Inherited instance methods

Examples

{ Resonz.ar(WhiteNoise.ar(0.5), 2000, 0.1) }.play

// modulate frequency
{ Resonz.ar(WhiteNoise.ar(0.5), XLine.kr(1000,8000,10), 0.05) }.play

// modulate bandwidth
{ Resonz.ar(WhiteNoise.ar(0.5), 2000, XLine.kr(1, 0.001, 8)) }.play

// modulate bandwidth opposite direction
{ Resonz.ar(WhiteNoise.ar(0.5), 2000, XLine.kr(0.001, 1, 8)) }.play