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2-3. Operation at Y/Pb/Pr Signal and
HDTV Signal Input
Y/Cb/Cr signal (DVD player output) or HDTV signal
enters from PB001 and reaches the A/D converter
(QD100) for Y/Cb/Cr (Y/Pb/Pr) signal after passing
through the low pass circuit. The A/D converter develops
16 bit signal of 8bit Y signal + 8bit Cb/Cr (Pb/Pr) and
enters the scaller IC through the selector for the signal
and that from the video decoder inside QD405. The
process following to the scaller IC is the same as that of
the video signal process.
The process relating to the sync process at Y/Cb/Cr signal
(DVD player output) input (clock generation) is carried
out by the video decoder and the clock generation at
HDTV signal input is by the A/D+PLL (QD300).
2-4. Camera Input Operation
A camera input enters the A/D converter for Y/Cb/Cr (Y/
Pb/Pr) signal through an exclusive connector and is
processed as a Y/Cb/Cr signal input. The camera signal is
a Y/Cb/Cr signal of fh=11.8 kHz and fv=15 Hz.
The clock generation is carried out in the A/D+PLL
(QD300).
2-5. Camera Overlay Signal
The camera overlay signal usually enters the A/D
converter for Y/Cb/Cr signal (Y/Pb/Pr) through an
exclusive connector in the same way as that of camera
input.
The A/D converter output enters QD405 and the red and
blue components of the signal are extracted by the level
slice circuit. Thus processed signal is converted into the
signal synchronizing with the LCD panel output timing
by using a memory (QD46). Then the signal is over-
lapped with the on-screen signal and the signal over-
lapped is fed to the on-screen signal input of the scaller
IC, and overlapped with the main video output signal. At
this time, the clock generation for overlay signal input
system is carried out by the PLL circuit exclusive for the
overlay.
As described above, the A/D converter for Y/Cb/Cr (Y/Pb/
Pr) signal is used for the overlay signal input, so the
signal which is usually processed by the A/D converter
for Y/Cb/Cr (Y/Pb/Pr) signal, that is, Y/Cb/Cr signal (DVD
player output), cannot be overlaid at the HDTV signal
input.
2-5
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