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class:: Resonz
summary:: Resonant filter.
related:: Classes/Formlet, Classes/RHPF, Classes/RLPF, Classes/Ringz
categories:: UGens>Filters>Linear
Description::
This is the same as link::Classes/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
code::
z = ±1
::
Based on emphasis::K. Steiglitz, "A Note on Constant-Gain Digital Resonators", Computer Music Journal, vol 18, no. 4, pp. 8-10, Winter 1994::.
classmethods::
method::ar, kr
argument::in
The input signal.
argument::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!
argument::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.
argument::mul
Output will be multiplied by this value.
argument::add
This value will be added to the output.
Examples::
code::
{ 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
::
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