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BLOCK DIAGRAM EXPLANATION
SYSTEM CONTROL AND SIGNAL PROCESSING
MAIN VIDEO FROM SELECTOR
IC:
the signal in one of 4 ways.
At the bottom left hand side is shown the Main Video
Normal: This will display a standard 4X3 picture
from Selector label. This is the NTSC video from the
with black panels on each side of the picture.
selector IC. This is routed to two blocks.
Fill: This will expand the picture to fill the screen.
The top and bottom will be cropped.
3D Y/C:
Full: This will expand the picture side ways and fill
The 3D Y/C separates luminance from the chroma. It
the screen. However the picture will be non-linear.
also add the 3D effect, (if the 3D Y/C is turned on
Smooth Wide: This will keep the center of the pic-
within the menu). Noise is canceled and the two sepa-
ture linear and stretch the outside edges to fill the
rate components are output to the VideoKhroma
De-
screen.
modulator.
With the four choices above, the DM-1 module controls
the signal for 3 of them; Normal, Fill and Full. However,
VIDEOKHROMA
DEMODULATOR:
during Smooth Wide, the deflection circuit is switched to
This IC decodes the signal down to it's Luminance and
perform the stretching of the sides. The slave Microproc-
Cht-oma. components and outputs it as 1HYIQ.
essor outputs SWide during this time.
; DM-1 I/F:
Noise cancellation and level shifting preparing the sig-
nal for the DM-1 module.
1HYIQ:
1HY = Standard NTSC format luminance. (Also
known as 4801).
I and Q = Standard NTSC format, demodulated
chroma components.
SYNC DET.:
Separates the Sync signal from the composite video sig-
nal.
SYNC DET.:
CUT OFF: = Output; labeled as V. Stop, during the Ser-
vice adjustments for Cut Off, (Screen Background con-
trols), the vertical must be collapsed. This output causes
the B+ to the vertical output IC front end to be grounded
and grounds the vertical trigger pulse called V. Saw.
D. SIZE: = Output; labeled as Digicon Size, during
Smooth Wide mode, the Digital Convergence Unit, hear
after called DCU, must know that the set is in the dis-
torted deflection mode. This signal tells the DCU just
that.
MAGIC SW: = Input; when the customer presses the
Magic Focus button on the control panel, the DCU noti-
fies the slave micro. That it is busy performing Magic
Focus. The slave micro. Notifies the DM-1 module and
This block outputs composite sync to the PinP unit which the DM-1 module ignores infrared pulses from the re-
is used for timing for display. This is specifically related
mote control.
to the Demodulator, D/As and Read/Write clock. The
Read/Write clock also is controlled by the frequency of
CLOSED CAP. DATA: = Input; This input receives the
the Subcarrier also called fsc.
composite sync signal and decodes the Closed Caption
The Composite sync is also sent to the DM-I on the line
Data. (Data Slice line 21) and the communicates with the
labeled as 1H Composite Sync. The DM-1 uses this sig-
DM-1 Module. The DM-1 Module actually introduces
nal for OSD positioning, auto channel detection and AFC the Closed Caption Characters into the Video stream.
loop activation.
F, PANEL: = Output will determine the IRE level of the
TV uCOM MICROPROCESSOR:
side panels when 4X3 Normal mode is used. By raising
This is the slave Microprocessor or Sub-Microprocessor.
the side panel IRE levels, the 4X3 picture won't bum in
This IC is in constant communications with the DM-1
the CRT's.
module. The slave Up. Receives or outputs the following
MAIN SYNC DET: = Input; this is used for detecting the
signals;
Closed Caption Data. This information is routed to the
DM-1 module for OSD generation. NOTE: the sub-
HBLK: = Input; this is the Horizontal Blanking signal.
micro. Doesn't produce OSD characters for Closed Cap-
Used for Service OSD signal creation timing.
tion.
PinP SYNC DET: = Input; PinP tuner sync is routed to
S.WIDE: = Output; when the customer watches regular
the sub-micro. And is used during PinP tuner channel
NTSC 4X3 aspect source, they have a choice of viewing
selection to activate AFC.
PAGE
04-08
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