10
CIRCUIT DESCRIPTION
1. SURROUND CIRCUIT
This model incorporates a surround processor circuit that provides 6 types of the surround sound. Fig.
1-1
is a block diagram
of the surround processor circuit.
The microprocessor transfers the data to the parameter control ( Serial data, Serial clock, Request Ready ) to operate the
circuits
in
each mode.
L
R
0608
AK5340
0601
(LC83016E)
PROGRAM
ROM
SUB
ROUTINE
,-------.------------------------1
---1
INPUT
DATA
I
DE-
:
emphasis
I
I
AUTO
INPUT
Balance
Adaptive
MATRIX
L
_________________
_
0603
DRAM
64kx
4bit
C
s
I
'O
( Block diagram of the surround proc
Fig.
1-1
(1) Stereo
Set to this mode to listen to ordinary stereo sound.
The rear L/R and center outputs will
be
muted.
0706
LC78213
SOURCE L
OUTPUT
SOURCE R
OUTPUT
Fig. 1-2
(2) THX Cinema
The
IC
0602
(LC83017E)
is
a THX Cinema decoder
IC.
IC Q602 (LC83017E) divides the 4 channel signals
(Left, Right, Center and Surround) sourcing from IC
Q601
(LC83016E) into 6 channel signals (Left, Right,
Center,
Surround
Left,
Surround
Right and Sub
Woofer).
0601
LC83016E
A
C
s
Fig. 1-3
0602
LC83017JE
1------+-R
1------+-C
1---------1-SUBW
1------+s
(3) Dolby pro logic
Q601 (
LC8316E)
is a Dolby pro logic decoder IC.
When an audio signal recorded using the Dolby pro
logic system is sent to this IC, the left, right, center
and surround components are separated. The
surround signal component is delayed
by
the digital
delay circuit by 15-30
mS
and
is
sent to the modified
8-type
decoder Q601 where noise reduction pro-
cessing is performed.
(4) Movie, 3CH Logic Hall, Matrix
The Movie mode provides the feeling of presence
you get from a 35-mm movie
in
a movie theater.
3CH Logic mode is used to improve the sound field
center by applying directivity enhancement provided
by the Dolby Pro Logic Surround decoder.
Hall mode provides a sound-field effect of medium-
sized circular hall with rich reverberations.
Matrix mode is effective for playing sports broad-
casts or outdoor live concerts. It provides a surround
mode with a wide surround effect.
All the connections of the circuits are the same in
these modes.
0601,
controlled by the microproces-
sor, processes the audio signals to produce various
sound effects and creates surround components to
use them as signals to drive the surround channel.
2.
CEl'I
With
'De
use of~
NORP.
WIPE
PHAI
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