Kurzweil K2600 - MUSICIANS GUIDE REV A PART NUMBER 910330 CHAP 16 User Manual

16-18
DSP Functions
The DSP Functions
Two-pole Allpass Filter (2POLE ALLPASS)
Using 2POLE ALLPASS is very similar to using ALPASS, with two differences. First, the phase
shift is -180 degrees for partials at the center frequency, approaching 0 degrees for partials at low
frequencies, and approaching -360 degrees for partials at high frequencies.
Second, since this is a two-stage function, thereÕs an additional control-input page (F2 WID)
which controls the Þlter width. The parameters on this page affect the frequency range,
measured in octaves, where most of the phase shifting occurs. Small values cause a drop from 0
to -360 in the phase shift to occur near the center frequency, while large values spread the drop
in the phase shift over a broader frequency range. Small values tend to affect just a few partials,
leaving others mostly untouched. The affected partials seem to become detached from the
others, creating the illusion of an additional sound source.
-360
-340
-320
-300
-280
-260
-240
-220
-200
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
10 100 1000 10000 100000
Frequency in Hertz
Phase in degrees
Width = 2 octaves;
Cutoff frequency
from C 4 to C 10
C 4
C 10
-360
-340
-320
-300
-280
-260
-240
-220
-200
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
10 100 1000 10000 100000
Frequency in Hertz
Cutoff frequency = C 6;
width from .1 to 4 octaves
4.1
Phase in degrees

Kurzweil K2600 - MUSICIANS GUIDE REV A PART NUMBER 910330 CHAP 16 Specifications

General

Mixer Type	Digital
Number of Output Channels	8
Effects Processing	Yes
MIDI Control	Yes
Sampling Rate	48kHz
EQ Bands per Channel	4