GRASS VALLEY 1200, Installation And Service

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Section 3 Ñ Functional Description
Wipe Pattern Generator
The Wipe Pattern Generator (Figure 3-9) produces a single wipe pattern
output which is used two places:
■
A 16-bit signal is sent to the Mixer Module for wipe transitions
■
A 10-bit signal which has been Clip and Gain adjusted goes to each of
the Key Processor Submodules to create the Preset Pattern Key
The Wipe Waveform Generator creates digital horizontal and vertical
ramps. From these ramps the Wipe Solid Generator creates the various
wipe patterns by modifying them according to various mathematical
formulas. Counters divide the horizontal and vertical ramps into segments
to produce pattern multiplication. The pattern outputs consist of a full 16-
bit signal which is sent to the Wipe Module to be used for wipe transitions
and a 10-bit version which is sent through a proc amp to the Preset Pattern
Generator on the Keyer Module.
Figure 3-9. Wipe Pattern Generator
Effects Send Output
This circuit converts the effects send signals from the switcherÕs internal
format to standard digital video.
WIPE
WAVEFORM
GENERATOR
WIPE
SOLID
GENERATOR
DELAY
RECLOCK
TRI-CLIP
AND
GAIN
RECLOCK
H_RST
V_RST
CLKBD
CPU Address
and Data
Wipe Pattern
Pattern Old
Pattern New
CLKTX