Glossary
Rumble
Filter
An
algorithm
that
attenuates
very
low
frequencies. In the DP /
4,
the Rumble Filter is
created
by
cascading four first
order
high
pass
filters. Originally conceived
to
eliminate
noise
in
turntables.
Sample
and
Hold A device
that
captures a signal
and
stores it for brief periods of time. The
new
signal
can
be
modulated
and
processed to create interesting sonic effects.
Unbalanced Jack
An
input
jack
that
has
two
wires.
One
carries the positive (+) signal, the other
the
Unit
negative
(-)
signal
and
is attached to
the
ground. These two signals are electrically
unbalanced.
The four
independent
effects processors
in
the
DP
/ 4 are called Units,
and
are referred to
as A,
B,
C,
and
D. Normally, each of
the
four Units is loaded
with
a different algorithm,
but
in
some
cases multiple units are combined to create one complex multi-unit effect,
such
as
the
vocoder.
Van Der Pol Filter
An
algorithm
that
adds
synthetic
high
harmonics to the
input
signal, usually
brightening
the
sound
. Van
Der
Pol originally developed the theory for this
mathematical
model
in
his
study
of oscillations caused
by
the non-linearities
in
vacuum
tube circuits. To
our
knowledge, this is the first implementation of this science
in
a
digital effects processor.
VCF-Distortion Voltage Controlled Filter
and
distortion. Useful for creating Distortion,
Wah
Wah,
Vocoder
xx
and
Auto
Wah
effects.
A device
or
algorithm that analyzes the frequency spectrum from
an
incoming source
(e.g. speech)
and
applies
that
analysis to the
sounds
of another source,like a
sampler/keyboard.
Typical examples include: talking orchestra, vocal electronic
percussion. The
DP / 4 uses 12
bandpass
filters to perform the analysis
(3
per
unit).
ENSONIQ DP/4 Musician's Manual
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