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Aphex Studio Dominator 700 - Compression Ratio; Operating Threshold

Aphex Studio Dominator 700
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to
but
not
exceeding
the
system
overload
point.
an
example
of
this
application.
Broadcasting
is
The
parameters
which
mainly
differentiate
between
limiters
and
compressors
are:
compression
ratio,
operating
threshold,
and
timing.
The
circuits
to
create
both
types
of
processors
are
essentially
similar,
using
a
variable
gain
cell
and
a
detector
circuit
to
control
the
cell.
Only
the
above
parameters
need
be
changed
to
realize
either
a
limiter
or
compressor
from
such
a
circuit.
Changes
in
any
of
the
three
parameters
will
result
in
significant
sonic
differences.
Therefore,
there
is
not
only
a
science
to
designing
a
good
compressor
or
limiter,
but
a
good
measure
of
art
as
well.
It
is
important
for
the
user
to
appreciate
these
factors
because
he
plays
an
artistic
role
in
the
way
he
uses
and
adjusts
the
equipment.
3.3
Compression
Ratio
"Compression
ratio"
refers
to
the
ratio
of
a
decibel
change
of
input
level
to
the
corresponding
decibel
change
of
output
level
of
a
device.
Thus,
if
a
2dB
change
of
input
caused
a 1dB
change
of
output,
the
compression
ratio
would
be
2:1.
Perfect
linear
circuits
produce
a
1:1
compression
ratio.
Compressors
and
limiters
use
compression
ratios
ranging
from
about
1.1:1
to
about
30:1.
This
ratio
is
sometimes
referred
to
as
the
compression
"slope".
Variable
slope
compressors
are
available
which
begin
compressing
with
a
small
ratio
and
gain
ever
increasing
ratio
as
the
input
signal
rises
in
level.
Most
compressors
and
limiters
generate
a
more
or
less
constant
slope,
however.
In
general,
compressors
operate
with
low
ratios
of
1.1:1
to
3:1;
levelers
and
limiters
with
greater
ratios.
from
7:1
to
20:1.
3.4
Operating
Threshold
The
operating
threshold,
either
refered
to
as
the
"compression
threshold"
or
"limiting
threshold"
depending
on
the
processor,
is
the
input
referred
signal
level
where
dynamic
range
modification
begins
to
take
place.
All
limiters
and
most
compressors
operate
as
linear
amplifiers
with
a
relative
slope
of
1:1
below
this
threshold.
The
most
notable
exception
to
this
rule
is
a
compressor
associated
with
some
"companding"
noise
reduction
systems
where
the
compression
slope
begins
close
to
the
noise
floor
of
the
compressor
circuit.
That
is
to
say
that
constant
ratio
compression
takes
place
over
nearly
the
entire
dynamic
range
of
the
system.
In
all
other
compressors,
the
compression
threshold
is
a
user
variable
setting
which
determines
the
"depth"
of
compression
which
will
be
used.
The
lower
the
threshold
setting,
the
greater
amount
of
compression
is
obtained.
For
limiters,
the
limiting
threshold
is
also
a
user
adjustment.
8

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