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-
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-I
---,
INPUT
DATA
I
I
DE·
emphasis
AUTO
INPUT
Balance
Adaptive
MATRIX
L
_________________
_
Q603
DRAM
64kx4bit
R
C
s
C
( Block diagram of the surrour
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
TC9215P
OFF
13
SOURCE L
OUTPUT
SOURCE R
OUTPUT
Fig. 1-2
(2) Dolby pro logic
0601 ( 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
B-type decoder
0601
where noise reduction pro-
cessing is performed.
(3) 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.
Cl
With
use c
NOi
WII
PH.
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