I
l
Section 4 - Algorithms
DE-ESSER
00
-
De-esser
is a stereo algorithm that compresses sibilant frequencies (like the /less"
sound)
as
they become louder. This
was
designed for vocalists,
but
it can also
be
used
to control the
boomy
sound
of a
guitar
or
the ringing
sound
of
drums
by
adjusting the side-chain appropriately.
De-esser Signal Routing
122
Left
Right
01-Mix
02-Volume
Compressor
(synthesis)
(Side
Chain
,-"-_......L
__
.....
EQ
(analysis)
Output Gain
Main
Outputs
See the descriptions
under
the Mix
and
Volume Parameters,
in
the
beginning
of this section. For
this algorithm
we
recommend
a setting of
99.
03
- Output Gain Range: -48 to +48 dB
This
parameter
sets
the
amount
of
cut
(negative values) or boost (positive values)
applied
to
the
de-esser
on
the
output
volume. We recommend a starting application of
00
dB.
04 - 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
threshold.
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.
05 - 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.
06 - Gain Change
Range: NlA
This
read
only
parameter
displays a gain reduction meter.
07 - Comp Attack Range: 50llS to 100ms
This
parameter
determines the attack rate after the initial signal has
been
detected
and
before the
compression takes affect.
08
- Comp Release Range: 1 ms to 10.
05
Determines
how
long
it
takes for the compression to be fully deactivated after
the
input
signal
drops
below
the
threshold
level. This
is
generally
set
longer
than
the
attack time (parameter
06)
.
09 - Noise Gate Off Below Range: -96 to +00 dB
This
parameter
sets
the
lower threshold level at which the noise gate
shuts
off the audio.
ENSONIQ
DP/4
Musician's Manual
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