Kurzweil K2500 - PERFORMANCE GUIDE REV F PART NUMBER 910251 CHAP 14 - Two-pole Lowpass Filter, -6 dB Resonance (LOPAS2)

DSP Functions
Filters
14-9
PARAMETER RANGE OF VALUES
ADJUST -12 to +24 dB
KEY TRACKING ± 2.00 dB per key
VELOCITY TRACKING ± 30 dB
SOURCE 1 Control Source list
SOURCE 1 DEPTH ± 30 dB
SOURCE 2 Control Source list
SOURCE 2 DEPTH CONTROL Control Source list
MINIMUM DEPTH, SOURCE 2 ± 30 dB
MAXIMUM DEPTH, SOURCE 2 ± 30 dB
Two-pole Lowpass Filter, -6 dB Resonance (LOPAS2)
Using this filter is the same as using two one-pole lowpass filters in successive algorithm
blocks. Since its resonance is fixed at -6 dB, it’s also the same as using 2POLE LOWPASS with
the resonance set to -6 dB. You’d use this filter when you want a 12 dB per octave rolloff but
don’t need to set a resonance level. This would leave you free to use another DSP function in
the algorithm, since it’s a one-stage function.
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1000 10000 100000
Frequency in Hertz
Resonance = 0 dB;
cutoff frequency
from C 4 to C 10
Amplitude in dB
C 4 C 10