Section 4 - Algorithms
DUCKER I GATE
00
-
Ducker
/
Gate
is a compressor that automatically lowers the level of a signal (such as
music)
when
another
signal (like
an
announcer voice-over) comes in.
When
the
voice-over
leaves,
the
level of
the
original signal is restored. This algorithm is useful for voice-overs, Rap,
and
DJ
work. In
order
for this algorithm to
work
properly, the music (audio source to
be
ducked)
must
be
plugged
into
Input
1 (left),
and
the voice-over is
plugged
into
Input
2 (right) ..
In
this set
up,
Input
2 is considered
the side
chain to a traditional compressor. This algorithm
employs
an
internal mixer
which
mixes left
and
right inputs to a
mono
output.
The gate function is achieved for
high
compression ratios. In this application a transient signal
source,
such
as a
snare
drum,
can
gate
on
and
off some other music signal
in
Input
I,
to achieve
an
externally controllable staccato effect.
Ducker I Gate Signal Routing
124
Left
Right
01-Mix
02-Volume
Compressor
(synthesis)
EQ
(analysis)
Output
Gain
Side Trim
Ducker
Output
Mixer
Main
Output
(mono)
See the descriptions
under
the Mix
and
Volume Parameters, earlier
in
this section. The mixer
works
as
in
all the
other
algorithms,
and
is distinct from the ducker
output
mixer,
shown
above.
03
- Output Gain
Range: -48 to +48 dB
This
parameter
sets
the
amount
of
cut
(negative values) or boost (positive values)
applied
to
the
ducker
on
the
output
volume
.
We
recommend a starting application of
00
dB
.
04 - Ducker Output Mix
Range: 00 to
99
Mixes
the
output
of
the
music signal (Input
1)
with
the
output
of the ducker (voice-over) signal
(Input
2) to a
mono
output.
This is the internal mixer which is
shown
in
the diagram.
05 - Comp Ratio
Range:
1:1
to 40:1, infinity
This
parameter
sets
the
amount
of compression. The range is based
on
decibels (dB) above the
thteshold.
If
this is
set
to 4:1 for example,
it
will compress changes in signals above
the
threshold
by
one
quarter
.
When
this is
set
to infinity, it acts as a limiter.
06 - Threshold
Range: -96 to +00 dB
This
parameter
sets
the
threshold
level. Signals that exceed this level will
be
compressed, while
signals
that
are
below
will
be
unaffected.
07 - Gain Change
Range: NlA
This
read
only
parameter
displays a gain reduction meter.
ENSONIQ DP/4 Musician's Manual
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