Kurzweil K2500RS, Musician'S Manual

Page: 266 / 530

DSP Functions
Filters
14-14
This combines two of the 2POLE HIPASS Þlters 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 Þlters. The parameters on the F2 RES page affect the
resonances of the Þrst Þlter. 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 Þlters. Positive values raise the cutoff frequency of the second 2POLE HIPASS, while
negative values lower it. If no separation is applied, thereÕs a 24 dB per octave rolloff below the
cutoff frequency. A variety of responses can be produced by adjusting the resonance and
separation settings.
-25
-20
-15
-10
-5
0
5
10
15
20
10 100 1000 10000 100000
Frequency in Hertz
Amplitude in dB
Cutoff frequency = C 5;
separation = 0;
resonance from -12 to 24 dB
24
-12
4-Pole Highpass Filter:
Resonance
-30
-25
-20
-15
-10
-5
0
5
10
10 100 1000 10000 100000
Frequency in Hertz
Amplitude in dB
Cutoff frequency = C 5;
resonance = 6 dB;
separation from -2 to +2
-2
+2
4-Pole Highpass Filter:
Resonance