-,
Section 4 - Algorithms
PHASER-DDL
00
- Phaser-DDL combines a
phaser
with
a digital delay. The
phaser
creates non-harmonically
spaced moving notches
in the signal spectrum, whereas a flanger creates
harmonic
spacing. This
phaser implements a stereo twelve pole
phasing
network
to achieve time
delay
which
is a
function of frequency; this is
what
differentiates the
phaser
from the flanger. The
phasing
effect
is achieved within the Phaser topology, so does
not
depend
upon
the external mix. A delay is
included
at
the left
output
of the
phaser
which
feeds back into the
phaser
(see topology). Setting
the
phaser
delay feedback
parameter
(shown
at
the knobs) to
00
will disable this delay function.
The delay feedback also controls the delay feed forward level of
another
tap
sent to the right
channel. This delay topology achieves a 1.5 sec. ping-pong effect,
and
is
very
effective as a
"poor
man's
reverb."
Phaser - DOL Signal Routing
Phaser
'O::'O:::;UIJCl\.."
Control
Delay
Feedback
Control
Delay
The
parameters
available for this algorithm are:
01-
Mix
02-Volume
L
Main
Outputs
See the descriptions
under
the Mix
and
Volume Parameters,
in
the
beginning
of this section. For
this algorithm
we
recommend
a Mix setting of
99
.
03 - Phaser LFO Rate
Range: 00 to
99
The LFO is within the
phaser
network. This
parameter
controls
the
rate of
modulation
of the
phaser
poles. The higher
the
value the faster the rate. Lower values
work
best
with
sustained
signals.
04 - Phaser LFO Width Range: 00 to
99
This parameter controls the
width
of the
notch
excursion.
For large excursions
set
this parameter
to
99
which
can give a very
high
"woosh
"
and
a very low
"woosh
."
05 - Phaser Center
Range: -99 to +99
This parameter controls the phaser pole center.
High
values raise
the
nominal
spectral location of
the
"woosh/l
sound,
while
low
values lower the "woosh./I The
range
from
high
to
low
is
controlled with
the
phaser
width.
ENSONIQ DP/4 Musician's Manual
103
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