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.
| 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. |
{ 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