19
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,
the n T u ne r wi ll b e
demodulating
and
output
standard
video
signal
TV-CVBS
,
and
sound
S
IF
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
be ou tp ut t wo wa ys , one w ay wi ll be
tran sf or m int o digital I 2S sign al
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
be ou tp ut t wo w ay s, one w ay w il l be
tran sf or m into d igit al I2 S s ignal
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 in a l
via
matched
resistance
a n d
sent
to
SPV7101P to
bass
adjust
and
volume
control,
the
sound
signal
will
be ou tp ut t wo w ay s, one w ay w il l be
tran sf or m into d igit al I2 S s ignal
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
be o utput t w o
wa ys , one wa y wi ll be transf or m int o dig ital I2 S signal
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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