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Working principle analysis of the unit
PAL/SECAM signal flow
1、
PAL/SECAM analog RF signal from antenna is inputted into TUNER FT2112 which is an
analog-digital-integrative model and controlled by main chip MSD209FG through I
signal is demodulated by the TUNER, then CVBS signal and audio difference IF signal SIF are
outputted.
TV CVBS signal is inputted into main chip MSD209FG directly to be processed by modules
"VIDEO DECODER, DEINTERLACE , VIDEO PROCESS and SCALER", then LVDS signal is
outputted to drive LCD panel.
SIF audio signal is inputted into main chip MSD209FG directly and processed by modules of
demodulation, pre-amplification, acoustic effect processing and volume control, then the audio signal
are divided to two signals, one is inputted into earphone amplifiers BH3547F to be amplified, then is
outputted to earphone jack, the other is inputted into D class audio power amplifier TAS5711 to be
amplified, then is outputted to drive speakers.
DTMB signal flow
2、
DTMB signal from antenna is inputted into TUNER FT2130 to be lower frequency converted,
TUNER FT2130 is an analog-digital-integrative model and controlled by main chip MSD209FG
2
through I
C bus, then different IF signal is outputted to demodulating chip LGS-8G80 to be
demodulated and then be inputted into main chip MSD209FG with standard format of serial or
parallel transport stream for de-multiplexing and decoding.
Video route: de-multiplex digital video signal is decoded and video processed by main chip
MSD209FG and then output LVDS signal to drive display panel.
Audio route: de-multiplex digital audio signal is decoded and audio processed by MSD209FG,
then dual-track (stereo) analog audio signal is outputted and processed by modules of
pre-amplifying, acoustic effect processing and volume control in MSD209FG, then the signal is
divided into two signals, one is sent into earphone amplifier BH3547F to be amplified, then outputted
to earphone jack directly, the other is inputted into class-D audio power amplifier TAS5711 to be
amplified and then outputted to drive speakers.
AV input signal flow
3、
AV video signal is inputted into main chip MSD209FG directly and processed by modules of
"VIDEO DECODER, DEINTERLACE, VIDEO PROCESS and SCALER", then LVDS signal is
outputted to drive LCD panel.
AV audio signal is processed by circuits of "voltage divided, impedance matching and
alternating-current coupling", then inputted into main chip MSD209FG directly for acoustic effect
processing and volume control, now the signal is divided into two signals, one is inputted into
earphone amplifier BH3547F to be amplified, then outputted to earphone jack directly, the other is
inputted into class-D audio power amplifier TAS5711 to be amplified and then outputted to drive
speakers.
D-SUB/YPbPr signal flow
4、
D-SUB, YPbPr video signal is inputted into main chip MSD209FG to be processed by modules
of "A/D TRANSFORM, VIDEO DECODER, DEINTERLACE, VIDEO PROCESS and SCALER", then
2
C bus, the RF
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