Working principle analysis of the unit
Signal Flow
1、 PAL signal flow
Send PAL analog RF signal received from antenna to TUNER FT2119 which is controlled by main
chip MSD209GL through I
2
C BUS; after frequency conversion by Tuner, analog IF output signal is
pre-amplified and then filtered by both picture and sound SAW, then it is sent out to demodulator IC
MSB1210; CVBS video signal and SIF audio differential signal will be outputted after demodulation;
CVBS video signal is sent into main chip MSD209GL to be processed by modules of video decoding,
deinterlacing, video processing and zoom, then LVDS signal will be outputted to drive display panel;
SIF audio differential signal is sent into main chip MSD209GL to be demodulated to analog audio
signal, then it is sent to earphone amplifier BH3547F to be amplified after the processes of
preamplification, acoustic effect processing and volume control, and then it is divided into two, one is
sent to earphone jack, the other is sent to digital audio power amplifier R2A15112 to be amplified and
then drive speakers.
2、 DVB-T signal flow
Send DVB-T digital RF signal received from antenna to TUNER FT2119 which is controlled by main
chip MSD209GL through I
2
C BUS; after down frequency conversion, differential IF signal will be
inputted to demodulator IC MSB1210 to be demodulated; then it will be sent to main chip
MSD209GL with the standard format of serial TS stream for demultiplexing and decoding;
Video route: digital video signal is sent into main chip MSD209GL for decoding and video processing
after demultiplexing, then LVDS signal will be outputted to drive display panel;
Audio route: digital audio signal will be sent into main chip MSD209GL for decoding and audio
processing after demultiplexing, then dual-sound-track analog audio signal (stereo) is sent to
earphone amplifier BH3547F to be amplified after the processes of preamplification, acoustic effect
processing and volume control by main chip MSD209GL, then one is sent to earphone jack, the
other is sent to digital audio power amplifier R2A15112 to be amplified and then drive speakers.
3、 AV input signal flow
AV video signal is sent into main chip MSD209GL to be processed by modules of video decoding,
deinterlacing, video processing and zoom, then LVDS signal will be outputted to drive display panel;
AV audio signal is sent into main chip MSD209GL for acoustic effect processing and volume control
after the processing of voltage division, impendence matching and AC coupling, then it is sent to
earphone amplifier BH3547F to be amplified, one is sent to earphone jack, the other is sent to digital
audio power amplifier R2A15112 to be amplified and then drive speakers.
4、 D-SUB/YPbPr input signal flow
D-SUB/YPbPr video signal is sent into main chip MSD209GL to be processed by modules of A/D
conversion, video decoding, deinterlacing, video processing and zoom, then LVDS signal will be
outputted to drive display panel;
D-SUB/YPbPr audio signal is sent into main chip MSD209GL for acoustic effect processing and
volume control after the processing of voltage division, impendence matching and AC coupling, then
it is sent to earphone amplifier BH3547F to be amplified, one is sent to earphone jack, the other is
sent to digital audio power amplifier R2A15112 to be amplified and then drive speakers.
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