Toshiba D-VR3SU Service Manual page 113

7-6 Audio
7-6-1 Input Block
DVD-VR300 has two stereo line input terminals. and internal TV-audio from RF Tuner Block. These three Analog
audio signal source are converted to digital data by Input Block.
Input Block has a Multiplexer (IC801), Input Filter (AIC81, AIC82), and A/D converter (AIC9).
IC203 change it's output by selection control signal from FIC1 (Front Micom).
The output signal of IC801 are filtered by OP-Amp (AIC81, AIC82).
AIC81 (L-ch) have two op-amp in each.
7-6-2 Output Block
DVD-VR300 has two stereo analog line out terminal, and two digital output terminal.
Decoded signal by DIC1 is inputted to AIC1 (D/A Converter), then filtered and amplified by AIC4 (OP-Amp).
And the digital audio signal (IEC-958) is drived by AIC3 inverter and ouputted in Optical/Coaxial (S/PDIF)
terminal.
L1-in
Line Input 1
(Rear)
R1-in
L2-in
Line Input 2
L2-in
(Front)
RF-L
TV Audio
(from MTS
RF-R
block)
FIC1
(micro controller)
Line out 1
(Rear)
Line out 2
(Rear)
Optical
Out
Coaxial
Out
4560 OP-AMP
IC801
SV1274
Multiplexer
4560 OP-AMP
AIC4
4560 OP-AMP
AIC3
74HCU04
(Inverter for
Digital Out)
AIC81
PCM1802
(Audio A/D
Coverter)
AIC82
L-out
AIC1
PCM1742KE
R-out
(Audio D/A
Coverter)
IEC958 DATA
Fig. 7-10
Circuit Operating Descriptions
SCKI
AIC9
BCK
LRCK
DOUT
DMN8602
A/V Processor
(Dolby AC-3
Encoder/Decoder)
SCKI
BCK
LRCK
DOUT
ML
MC
MD
DIC1
7-13