11
3. Working
principle
analysis
of
the
unit
1.
NTSC
signals
flow:
Antenna signal
will
be
send
to
tuner ENV56U05D8F,
then Tuner will be
demodulating
and
output
standard
video
signal
TV-CVBS
,
and
sound
S
IF
signal
.
TV-CVBS
will
send
to
the
master
control
IC
ZR39748 to
video
decode,
de-interlace
and
scaler,
then
output
LVDS
level
drive
for
panel
display.
The
sound
IF
(SIF)
will
be
fed
into
ZR39748,
after
demodulating,
pre-amplifying,
bass
adjusting
and
volume
control,
the
sound
signal
will be transform into digital I2S signal
and
sent
to
digital
amplifier
TAS5707L
.
2.
Composite/Component
signal
flow
Composite signal and Component
signal
will
be
fed
to
ZR39748
to
perform
video
decode,
de-
interlace
and
scaler,
then output
LVDS
drive
level
for
panel
display.
Audio
signal
from
Composite/Component
terminal
via
matched
resistance
is
fed
to
ZR39748
to
bass
adjust
and
volume
control,
the
sound
signal
will
be transform into digital I2S signal
and
sent
to
digital
amplifier
TAS5707L
.
3.
PC
signal
flow
PC
signal
via
terminal
socket
sent
to
ZR39748 A/D,
PC
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
terminal
via
matched
resistance
and
sent
to
ZR39748 to
bass adjust
and
volume
control,
the
sound
signal
will
be transform into digital I2S signal
and
sent
to
digital
amplifier
TAS5707L
.
4.
HDMI
signal
flow
Two
HDMI
video
signals
are
directly
fed
to
the
master
control
IC
ZR39748
to digital
decode,
image
scale,
then
output
LVDS
drive
level
for
panel
display. HDMI
audio
signal
via
decoder
built-in
ZR39748
to bass
adjust
and
volume control, the
sound
signal
will
be transform into digital I2S signal
and
sent
to
digital
amplifier
TAS5707L
.
5.
USB
signal
flow
USB
signal via USB connector sent
to
ZR39748 and its
A/D
conversion to
YPbPr
output
for
ZR39748, then 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
USB
signal
via
matched
resistance
and
sent
to
ZR39748 to
bass adjust
and
volume
control,
the
sound
signal
will
be transform into digital I2S signal
and
sent
to
digital
amplifier
TAS5707L
.
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