Copyright©2007 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
Only for training and service purposes
2. Digital RF(ATSC, QAM) Audio signal flow chart
*Tuner(ATSC/QAM) Audio signal flowchart
RF Signal Input
(ATSC/QAM)
I
2
S
TS Data
Unscrambled
TS Data
IEC958
IC401
DTV Controller
IC901
ALTERA FPGA
Speaker
Stereo(L/R)
IC708
Digital Audio Amp.
P501
SPDIF Output
Connector
P706, P707
Audio Output
Connector
IC105
TUNER
The digital RF signal(ATSC/QAM) received in the input terminal of the tuner is converted to the base band signal in
the tuner(IC105) to send out 8 bit transport stream.
This signal includes both the video and audio signal. The audio received by the DTV controller through IC901 is
decoded for Dolby AC3 in the audio decoder and the PCM data is transferred in I
2
S format.
This signal is converted to stereo signal(L/R) from the digital audio amp(IC708) and then sent to the internal speaker
through audio output connector(P706, P707).
Also for the digital audio data in IC401, the PCM or AC3 compressed data by user setting is sent out in SPDIF
format through P501.
