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TV channel
The signal is inputted to TUNER and then to IF from RF. IF signal is inputted
to main chip to be demodulated by NTSC ， ATSC and BTSC sections
respectively, all of demodulation are completed within main chip.
HDMI，AV，SV，YPBPR and VGA signals are inputted to main chip directly
without any outside switch and EEPROM.
FM radio channel
FM signal is inputted from external antenna, then analog audio signal
processed by chip Si4702 is outputted to main chip.
USB channel
Only used to upgrade software without other functions developed
Sound
Both analog audio signals are outputted from main chip, signal of channel 1 is
outputted to speakers after amplified by power amplifier, signal of channel 2 is
outputted to Audio Out after amplified by earphones amplifier.
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