16
Working principle analysis of the unit
1. NTSC/ATSC signal flow:
Antenna reception NTSC/ATSC signal will be send to tuner U25,
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 IF signal (SIF).
TV-CVBS will send to the master control IC U9 to video decode, de-interlace and scaler, then output
LVDS level drive for panel display.
The sound IF (SIF) will be fed into U9, after demodulating, pre-amplifying, bass adjusting and
volume control, the sound signal will
b e t ra n s fo r m i n t o dig i t al I2 S s ig n al b y
scaler
I C
and sent to digital amplifier U24 amplifying,
then output to speaker
.
2. AV/SV signal flow
SV signal and the Video1 path AV signal switch
by menu “Setup”->“AV Connecting”->”Video1
input”
via terminal socket, the signal and the Video2 path AV signal will be fed to U9 to perform
video decode, de-interlace and scaler, then output LVDS drive level for panel display.
Audio signal from AV/SV
terminal
via matched resistance is fed to U9 to bass adjust and volume
control, the sound signal will be
transform into digital I2S signal by scaler IC
and sent to digital
amplifier U24 amplifying,
output to speaker
.
3. PC/YPrPb signal flow
PC and the Video3 path YPbPr signal are via terminal sent to U9 A/D conversion, output R/G/B of
24 bit to back end module to digital decode, 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 U9 to bass adjust and
volume control, the sound signal will be transform into digital I2S signal by scaler IC and sent to digital
amplifier U24 amplifying,
then output to speaker
.
4. HDMI signal flow
Three HDMI video signals via terminal sent to
U9
to digital decode, image scale, then output LVDS
drive level for panel display. HDMI audio signal via decoder built-in terminal sent to
U9
is fed to back
end to bass adjust and volume control, the sound signal will
be
transform into digital I2S signal by
scaler IC and sent to digital amplifier
U24
amplifying,
then output to speaker
.
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