Section 4 - Algorithms
Section 4 - Algorithms
Understanding DP/4 Algorithms
The DP / 4 is a
powerful
signal processor
which
can
produce
a
wide
variety of al
gorithms
(effects). The flexible config routing scheme
and
the extensive
parameter
control give
the
DF
/4
its dynamic effects capability.
The
DP
/ 4 is
equipped
with
an
advanced
digital signal processing
system
based
on
the ENSONIQ
Signal Processor (ESP) chip. The ESP is designed specifically for digital
audio
signal processing,
and
in
the DP
/4,
four ESP chips
work
in conjunction
with
16-bit analog-to-digital
and
digital-to-
analog converters to
provide
a
very
high-quality
output
signal.
The digital effects processing
has
been
designed to complement
any
input
source,
and
all of the
algorithms can
have
specific parameters
modulated
by
various MIDI
and
non-MIDI controllers
such as a keyboard's pitch wheel, a CV
Pedal, etc.
The algorithms are fully programmable,
and
may
be customized for particular applications.
Algorithms are stored as
parts
of a preset, although each algorithm
can
be
individually selected
(in
the
form of 1
Unit
presets). Each of these algorithms are treated a little differently,
and
will be
described individually
on
the following pages.
About the Parameters
Each algorithm in
the
DP
/ 4 contains a complete set of
parameter
values which determine
how
that algorithm will
sound
. The algorithm
is
present
even if the signal
is
not
routed
through
the
effect (e.g.
when
the
units
are bypassed). Whenever
you
copy
or
save
an
algorithm as a preset,
the
parameter
settings are also saved.
The algorithm parameters are displayed
by
pressing the Edit
button
then
the
appropriate
Unit
button,
and
edited
by
pressing the Left/Right
Arrow
buttons
and
turning
the
Data
Entry Knob.
The parameters
that
pertain
to
each algorithm are described later
in
this section.
Programming Algorithms
The
DP
/ 4 algorithms are highly programmable. There are several
common
parameters
for every
algorithm as well as algorithm-specific parameters. The first
parameter
selects
which
algorithm
will
be
used. When this
parameter
is changed, a
new
algorithm is selected
which
causes several
important
things to occur.
When a
new
algorithm is selected:
• a
new
program
is
loaded
into the
ESP
chip, causing a brief
pause
in
the
audio
output,
•
the
parameter screens are redefined for
the
particular algorithm selected,
and
• the parameters are automatically set to their preset values for
the
new
algorithm.
ENSONIQ DP/4 Musician's Manual
55
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