Kurzweil K2661 Musician's Manual page 512

DSP Functions
The DSP Functions
4-Pole Highpass Filter:
Resonance
4-Pole Highpass Filter:
Resonance
This combines two of the 2POLE HIPASS filters into one three-stage function. It has a rolloff of 6
dB per octave below the cutoff frequency. The parameters on the F1 FRQ control-input page
affect the cutoff frequencies of both filters. The parameters on the F2 RES page affect the
resonances of the first filter. There will always be a slight extra boost of partials at the cutoff
frequency, even at low resonance settings. The parameters on the F3 SEP page shift the cutoff
frequency of the second 2POLE HIPASS, creating a separation between the cutoff frequencies of
the two filters. Positive values raise the cutoff frequency of the second 2POLE HIPASS, while
negative values lower it. If no separation is applied, there's a 24 dB per octave rolloff below the
cutoff frequency. A variety of responses can be produced by adjusting the resonance and
separation settings.
16-16
10 100
20
15
10
5
0
-5
24
-10
-15
-20
-12
-25
10 100
10
5
0
-2
-5
-10
-15
-20
-25
+2
-30
Frequency in Hertz
1000 10000
Cutoff frequency = C 5;
separation = 0;
resonance from -12 to 24 dB
Frequency in Hertz
1000 10000
Cutoff frequency = C 5;
resonance = 6 dB;
separation from -2 to +2
100000
100000