DSP Functions
Filters
14-8
The Coarse Adjust parameter sets the cutoff frequency in terms of a key name. The remaining
parameters (except Pad) alter the cutoff frequency in increments of cents. YouÕll notice that
positive values for key tracking have an interesting effect on the function of lowpass Þlters;
positive key tracking values raise the cutoff frequency for high notes and lower it for low notes.
More speciÞcally, a value of 100 cents per key on this page, when Þltering a constant waveform
like a sawtooth, would result in waveforms of exactly the same shape for all pitches of the
waveform. The cutoff frequency moves in sync with the frequencies of the waveformÕs partials
as different pitches are generated. Negative key tracking values will steepen the rolloff of
lowpass Þlters above the cutoff. The Pad parameter, as always, attenuates the signal at the
input to the function. These parameters affect all the lowpass Þlters similarly.
Two-pole Lowpass Filter (2POLE LOWPASS)
The two-pole lowpass Þlter has a rolloff of 12 dB per octave above the cutoff frequency. This is a
two-stage function, so it has two control input pages. The Þrst affects the cutoff frequency, and
has the same parameters as the one-pole lowpass. The second control input page (F2 RES)
affects the resonance of the Þlter. Resonance is a cut or boost in amplitude of the partials in the
vicinity of the cutoff frequency.
Set the resonance with the Adjust parameter on the F2 RES control input page, and use the
other parameters to assign various controls to alter it. If a boost is applied at frequencies where
there are high-amplitude partials, the signal may clip. The Pad parameter on the F1 FRQ page
will reduce the clipping, but thereÕs no harm in keeping it if you like the sound.
EditProg:F2|RES(2P|LOPASS)|<>Layer:1/1||
Adjust:
0.0dB|||||||
|Src1||:OFF||||||||||
||||||||||||||||||||Depth|:|0.0dB|||||||
||||||||||||||||||||Src2||:OFF||||||||||
KeyTrk:|0.00dB/key||DptCtl:OFF||||||||||
VelTrk:|0.0dB|||||||MinDpt:|0.0dB|||||||
||||||
|
||||||
|
||||||
M
axDpt:
|
0.0dB|
|
|||||
<more|
|
F1|FRQ
|
F2|RES
|
F3||||
|
F4|AMP
|
more>
PARAMETER
RANGE OF VALUES
-80
-60
-40
-20
0
20
10
100
1000
10000
100000
Frequency in Hertz
Amplitude in dB
Cutoff frequency at C 5;
resonance from -12 to 24 dB
in increments of 6 dB
24
-12
Содержание K2500RS
Страница 12: ...Table of Contents TOC 12...
Страница 16: ...Introduction How to use this manual 1 4...
Страница 32: ...User Interface Basics The Panel Play Feature K2vxR 3 8...
Страница 106: ...Effects Mode and the Effects Editor Configurations and Parameters 9 24...
Страница 186: ...Song Mode Recording Multi timbral Sequences via MIDI 12 52...
Страница 304: ...DSP Functions Hard Sync Functions 14 52...
Страница 394: ...Programs Setups and Keymaps K2500 ROM Keymaps 21 12...
Страница 402: ...LFOs LFO Shapes 23 4...
Страница 406: ...Note Numbers and Intonation Tables List and Description of Intonation Tables 24 4...
Страница 434: ...DSP Algorithms 26 14...
Страница 450: ...MIDI and SCSI Sample Dumps SMDI Sample Transfers 29 8...
Страница 464: ...Glossary 31 6...
Страница 490: ...K2vx Program Farm VOX K25 Appendix A 22...
Страница 494: ...K2vx Compatibility Converting programs from the K2vx to K2000 Appendix B 4...