EasyManua.ls Logo

Aphex Studio Dominator 700 - Summing Final Limiter; Process Sample Rectifier; Output Ceiling Circuit

Aphex Studio Dominator 700
50 pages
Save Page as PDF
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
limiter
is
thus
produced.
Restoration
of
the
gain
control
voltage
to
zero
is
accomplished
by
the
discharge
path
provided
by
Q301.
The
rate
of
discharge
is
determined
by
the
"Release
Time"
control
which
programs
Q301
as
a
current
sink.
9.4
SUMMING
FINAL
LIMITER
The
three
VCA
limiters
output
their
signals
to
the
summing
final
limiter
composed
of
U511
with
associated
components.
The
totally
processed
audio
signal
comes
out
of
this
circuit
and
is
sent
to
the
"Peak
Ceiling"
circuit
for
final
output
amplitude
programming.
The
summing
final
limiter
uses
a
pair
of
light
emitting
diodes
as
soft
clippers
to
catch
transient
peaks
and
limit
them
to
approximately
1.9
volts
amplitude.
This
defines
the
maximum
peak
ceiling
of
the
output
signal
at
this
point.
ALT
action
(later
described)
maintains
consistent
peak
levels
just
below
the
clipping
point
and
anticipates
the
amount
of
clipping
to
maintain
inaudible
peak
protection.
A JFET
switch
comprising
Q103,
R134,
and
D106,
removes
the
soft
clipper
LED's
from
the
summing
amplifier
in
"process
off"
mode
to
eliminate
clipping.
9.5
PROCESS
("PROC")
SAMPLE
RECTIFIER
Outputs
from
the
three
VCA
limiters
are
summed
into
a
full
wave
rectifier
composed
of
U103A/B
and
associated
components.
D104
serves
to
cause
the
output
of
U1038
to
contain
a
slight
d.c.
offset
equal
to
one
diode
drop.
This
biases
the
Hor"
summing
diode
Dl0S
to
the
verge
of
conduction
under
zero
signal
conditions
to
improve
the
dynamic
range
of
the
proc
sample
bus.
The
proc
sample
signal
is
utilized
by
both
the
ALT
~nd
TEe
circuits.
9.6
OUTPUT
CEILING
CIRCUIT
Audio
from
the
summing
final
limiter
is
coupled
to
the
wiper
of
S506,
the
"Output
Ceiling"
selector.
Resistors
R601
through
R612
are
selected
by
S506
to
set
the
stage
gain
in
1
decibel
increments.
Feedback
gain
is
switched
by
CMOS
switch
U507
which
is
controlled
by
the
"Range"
switch.
A
change
of
12
decibels
is
provided
by
this
gain
switch
to
appropriately
rescale
the
range
of
the
output
ceiling
circuit.
VR6Il
provides
a + 2dB
gain
trim
for
final
output
calibration.
Output
from
this
stage
is
a
balanced
differential
signal
which
is
subsequently
coupled
to
the
line
amplifier
3 1

Table of Contents

Related product manuals