Section 4 - Algorithms
EXPANDER
116
00
-
Expander
performs
downward
expansion of
input
signals. For
high
expansion
ratios this
algorithm
functions as a gate. This algorithm operates
by
expanding
(attenuating) signals
below
the
threshold
and
passing
the
signals above the threshold. The Threshold is a
parameter
defined
by
the
user. This
algorithm
can
be
used
to eliminate noise. There is
no
EQ
in
the
audio
path;
high
and
low
pass
filtering
are
provided
on
the side chain only. This algorithm posesses
two
features
which
are new:
1.
The ADSR
in
this
algorithm
has
Attack, Sustain,
and
Release (the sustain is
new
and
is called
the
Hold
Time).
2 This
algorithm
contains a trigger
mask
function. This function is
used
primarily to extract a
click
b;ack from
drum
tracks. Once triggered, this function inserts a zero signal level
into
the
side
chain
detector for
an
amount
of time determined
by
the user. This function becomes
triggered
if
Trigger
Mask
is
enabled
and
if
side chain signal falls below the Trigger
Mask
Threshold.
Signal Level
-----
••
~
Pass
Threshold
1-------------
01-Mix
02-Volume
~Attenuate
Time
See the descriptions
under
the
Mix
and
Volume Parameters,
in
the beginning of this section. We
recommend
a setting of
99.
03 - Exp Ratio
Range: 1:1 to 1
:40,
infinity
Sets
the
amount
of expansion. The
range
is
based
on
decibels (dB)
below
the threshold.
If
this is
set
to 1:4 for example, it will
expand
changes
in
signals below the threshold
by
a factor
of
four
.
When
this is
set
to infinity,
it
acts as a gate. A setting of
1:1
offers
no
expansion.
04 - Exp Threshold Range: -96 to +00 dB
This
parameter
sets the
threshold
level. Signals that exceed this level will
be
unaffected,
while
signals
that
are
below
will
be
expanded.
To
tum
off the expander, set the level to -96 dB.
05 - Gain Change Range:
N/A
This
read
only
parameter
displays the
amout
of gain reduction
in
real time.
06 - Exp Attack
Range: 50llS to 100ms
This
parameter
determines
the
attack rate after the initial signal
has
been
detected
and
before the
expansion
takes affect.
07 - Exp Release
Range: 1
ms
to 10.0s
This
parameter
determines the release rate after the signal
has
been
detected
below
the
threshold
level. This is generally chosen
longer
than
the attack time (parameter 06).
ENSONIQ DP/4 Musician's Manual
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