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Harman Kardon HD7725 - Page 23

Harman Kardon HD7725
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4.
REAL-TIME
SMOOTHING
MODULE
The
first
stage
in
the
RLS
module
is
the
8
fs
digital
filter,
|C601
(SM5840CP).
IC601
also
provides
the
de-emphasis
characteristics
when
needed.
The
output
of
IC601
drives
the
IC602
Hex
Inverter
and
the
IC603
8-bit
shift
register.
1C602
and
IC
603
drives
IC605,
IC607
and
'C609
(for
the
left
chan)
and
IC604,
IC606
and
IC
608
(for
the
right
chan)
.The
signals
from
IC605
drives
IC611
directly,
and
passes
through
IC607
and
{C609
before
driving
IC613.
This
results
in
the
timing
of
the
signal
to
pin
7
of
IC611
being
ahead
of
the
signal
to
pin
7
of
IC613.
In
the
same
way,
the
timing
of
the
signal
to
pin
7
of
IC612
is
ahead
of
the
signal
to
pin
7
of
IC614.
1C611, 1C612,
1C613
and
|C614
are
18
bit
linear
D/A
converters
operating
on
the
R-2
R,
or
Resistor
Ladder,
Principle.
The
signals
from
pin
10
of
IC611,
1C612,
C613
and
1C614
are
sent
to
the
Comparator/Integrator
and
Summing
Amplifier
(as
shown
by
Fig.
9).
THE
RLS
SYSTEM
(BLOCK
DIAGRAM)
ig.
9
Advanced
Signal
18-Bit
D/A
Converter
foes
AUDIO
Phd
Inverter
CIRCUIT
18-Bit
D/A
Delayed
Signal
Converter
5.
AUDIO
CIRCUIT
5-1,
Comparator/integrator
and
Summing
Amplifier.
Dual-Differential
circuits
comprising
of
Q301, Q303, Q305, Q307,
Q309
and
Q311
with
capacitor
C309
,smoothes
out
the
time
difference
between
1C611
and
IC613.
The
signal
is
then
fed
through
R329
to
the
final
buffer
circuit,
Q313
and
Q315
(for
the
left
channel). Also
Dual-Differential
circuits
comprising
of
Q302,
Q304, Q306, Q308,
Q310
,and
Q312
with
capacitor
C310,
smoothes
out
the
time
differance
between
IC612
and
IC614.
The
signal
is
then
fed
through
R330
to
the
final
buffer
circuit,Q314
and
Q316
(for
the
right
channel).
5-2.0utput
Amplifier
The
fixed
left
output
jacks
are
driven
by
an
amplifier
comprised
of
Q317
and
Q319.
The
variable
left
output
jacks
are
driven
by
an
amplifier
comprised
of
Q321
and
Q323.
Also
Muting
is
provided
by
Q331,
Q332,
Q333
and
Q334.
The
fixed
right
output
jacks
are
driven
by
an
amplifier
comprised
of
Q318
and
Q320.
The
variable
right
output
jacks
are
driven
by
an
amplifier
comprised
of
Q322
and
Q324,
Also
Muting
is
provided
by
Q335,
Q336,
Q337
and
Q338
(as
shown
by
Fig. 10).
FROM
RLS
MODULE
Integrator
and
Summing
Amp
Q313,
Q315
Q317,
Q319
Fig.
10
22

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