Copyright©2007 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
Only for training and service purposes
6. AV1, AV2, AV3 Audio signal flow chart
*Composite(AV1, 2, 3(S-Video)) Audio signal flowchart
AV1, AV3
(S-Video) Input
AV2 Input
I
2
S
I
2
S
IEC958
IC401
DTV Controller
IC602
Audio Processor
IC601
Audio Switch
Speaker
Stereo(L/R)
IC708
Digital Audio Amp.
P501
SPDIF Output
Connector
P706, P707
Audio Output
Connector
CN105
Wafer
P703
RCA Jack
The left/right audio signal of AV1, AV2 and AV3(S-Video) is received by P703 and CN105, and the AV3 uses the
same audio terminal as S-Video.
One stereo signal among the signals received through the audio switch(IC601) to send to the audio process(IC602).
The Audio switch receives the audio input signal of AV1, AV2, AV3(S-Video) and component1, component2,
PC(DVI) to select and output one stereo signal.
The stereo signal selected this way is converted to I
2
S format in the audio processor to send to DTV controller for
output I
2
S format through audio decoding process.
This signal is converted to stereo signal (L/R) in the digital audio amp(IC708) to send to the internal speaker through
audio output connector(P706, P707).
Also the digital audio data in IC401 is outputted as PCM data in SPDIF format through P501.
