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Working principle analysis of the unit
1. PAL/SECAM and NTSC signals flow:
Antenna reception, B/G, I, D/K, signal will be send to tuner M40CPT-2PNB-E, t h e n T u n e r w i l l b e
demodulating and output standard video signal TV-CVBS, and sound SIF signal.
TV-CVBS will send to the master control IC SPV7101P to video decode, de-interlace and scaler, then
output LVDS level drive for panel display.
The sound IF (SIF) will be fed into SPV7101P, after demodulating, pre-amplifying, bass adjusting
and volume control, the sound signal will b e o u t p u t t wo w a y s , o n e w a y w i l l b e
t r a n s f o r m i n t o d i g i t a l I 2 S s i g n a l and sent to digital amplifier STA335BW, then sent to
speaker, another will be sent analog sound signal to earphone amplifier TPA6132.
2. Composite/S-Video signal flow
Composite signal and S-Video signal path AV signal switch by menu "Setup"->"Video1 Input" via
terminal socket to Video switch IC NC7SB3157, then signal and the Video2 path AV signal will be
fed to SPV7101P to perform video decode, de-interlace and scaler, then output LVDS drive level for
panel display.
Audio signal from Composite/S-Video terminal via matched resistance is fed to SPV7101P to bass
adjust and volume control, the sound signal will b e o u t p u t t wo w a y s , o n e w a y w i l l b e
t r a n s f o r m i n t o d i g i t a l I 2 S s i g n a l and sent to digital amplifier STA335BW, then sent to
speaker, another will be sent analog sound signal to earphone amplifier TPA6132.
3. PC/Video3 signal flow
PC and the Video3 path Composite/YPbPr signal switch by menu"SET UP"->"Video3 Input"
via terminal socket sent to SPV7101P A/D conversion(YPbPr), PC/YPbPr output R/G/B of 24 bit
to back end module to Video decode, de-interlace and image scale, then send to LVDS level
drive for panel display.
Sound signal of PC/YPrPb t e r m i n a l via matched resistance a n d sent to SPV7101P to bass
adjust and volume control, the sound signal will b e o u t p u t t wo w a y s , o n e w a y w i l l b e
t r a n s f o r m i n t o d i g i t a l I 2 S s i g n a l and sent to digital amplifier STA335BW, then sent to
speaker, another will be sent analog sound signal to earphone amplifier TPA6132.
4. HDMI signal flow
Three HDMI video signals via switcher IT6633P are directly fed to the master control IC SPV7101P to
digital decode, image scale, then output LVDS drive level for panel display. HDMI audio signal via
decoder built-in SPV7101P to bass adjust and volume control, the sound signal will b e o u t p u t t w o
w a y s , o n e w a y w i l l b e t r a n s f o r m i n t o d i g i t a l I 2 S s i g n a l and sent to digital amplifier
STA335BW, then sent to speaker, another will be sent analog sound signal to earphone amplifier
TPA6132.
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