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Circuit Description
Figure 1 is a block diagram of the LD100 showing
signal flow and the location of front panel controls
and switches. Composite Video and Y/C (S-VHS)
inputs are connected to the units decoder with AGC
control and converted to Y, R-Y and B-Y signals.
The Y, (Luminance) output from the decoder enters
the input switcher while the R-Y and B-Y signal
enter the Chroma Enhancement block where the
Tint phase can be adjusted when selected in the
manual mode. The RGB input signals are trans-
coded to Y, R-Y, and B-Y signals and fed to the
input switcher. Component signals are fed directly
to the input switcher.
The input switcher then selects the correct function
and outputs the Y signal to the Luminance Line
Doubler block. The Luminance Line Doubler block
contains the Brightness, Contrast and Freeze con-
trols while the R-Y and B-Y signals enter the
Chroma Line Doubling block where the color level
can be controlled along with the Freeze controls.
The Line Doubled Luminance signal now enters the
Luminance Detail and Noise Reduction block where
the functions of Noise Reduction and Detail Level
are controlled.
The Luminance signal from the Luminance Detail
and Noise Reduction block along with the R-Y and
B-Y signals from the Chroma Line Doubling block
feed the output transcoder and are converted to
RGB signals. These RGB signals are buffered and
then sent to the rear panel outputs to both the BNC
and VGA interface connectors.
When using the RGB or Component inputs, Sync is
derived from the G or Y input signals unless sync is
provided to the Composite Sync input. The
Composite Sync input will override the sync from
the G or Y inputs. The sync signal then feeds the
LD100 systems clock generator and is used as a
reference to generate Horizontal Sync, Vertical
Sync, Composite Sync.
Inventory List
1 LD100 Digital Scan Converter
1 Installation/Operation Manual
1Warranty Card
1 Power Cord
2 Rack Mount Ears
1 Rack Mount Screw Kit
5
SYSTEM DESCRIPTION
Caution Notes
Do not connect the LD100 to a Monitor/
Projector not capable of the correct scan
rates. (31.5KHz)
High Voltages are present inside. Opening
the unit will void all warranties.
No user serviceable parts inside.