Component Input Block Explanation
(See Pages
19
and 2
0
)
Main Picture (Input 1 or 2 Component 480I 15K, 480P 31K and 720P
45K)
IC3901 is used as the input 1 and 2 main picture selector and if the input is 480I,
480P or 720P the user selected signals pass through IC3901 and enter IC2803. The
Y/CB/CR signals bypass the color demodulator and go directly to the progressive
unit. The sync signals are separated by IC3901 and pass through IC2803 and onto
the progressive unit for processing. 15K sync signals entering the progressive unit
are doubled, 31K pass though and 45K signals are converted to 31K and outputted
to IC4608 for final processing.
Sub Picture (Input 1 or 2 Component 480I or 480P)
Component inputs 1 or 2 can be used for the sub picture (twin picture) function as
long as the signals are 480I or 480P and full mode has not been selected. Note: 720P
cannot be used as a sub picture source. 720P defaults to full screen mode only.
IC3906 is the input user selector switch for the sub picture from component inputs 1
or 2. The selected Y/CB/CR signals along with the separated sync signals go to
IC2806. The Y/CB/CR and separate sync signals pass through IC2806 and go onto
the progressive unit for twin picture and sync processing.
Main Picture (1080I 33K and 480P Full-Mode)
IC3901 (the main picture component output selector) user selects input 1 or 2 and
outputs the Y/CB/CR signals in 1080I or 480P full-mode format and sends the
signals to IC4305 (the full component switch). From IC4305 the signal directly
enters IC4606 for picture, color and RGB processing. The separated 31k or 33K
sync signals from IC3901 also go directly to IC4606 after passing through switch
IC4610 for sync processing. 480P full-mode requires no size conversion from the I/P
converter inside the progressive unit.
