GRASS VALLEY 1200, Installation And Service

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Section 3 Ñ Functional Description
Key Processor SubmoduleÑ
The standard system has a Key Processor
Submodule for Key 1 and the DSK. The Key Processor Submodule uses the
key source and the key fill video to create a key cutter and video fill that are
put over the background video in the mixer.
Program Mixer ModuleÑ
The Mixer Module does the following:
■
Combines the video signals, the key signals, and the wipe solid signal
to create the program video
■
Interfaces to the Depth Processor Submodule option
■
Interfaces to Analog Output (DAC) option
The Program Mixer Module uses the video signals, key signals, and the
wipe control signals from the Keyer Module to create a video with all the
requested elements. A composite key signal is also created and sent to the
output. These signals enter the optional output module for conversion to
either a serial or parallel digital video signal.
Options
Input and Output ModulesÑ
The Input and Output Modules are required to
operate the system but have been made optional to allow the user to select
either the serial or parallel version. These options convert the signal levels
between the ECL levels of the external signal and the TTL signals used
internally in the system. The Serial Input Module also converts the signal
between serial and parallel. The Input modules strip the clock off the input
signal for timing. The Output Modules reassemble the clock and data.
Chroma KeyerÑ The Chroma Keyer option mounts on the Crosspoint
Module. This submodule creates the chroma key and key fill from any
selected Key Bus input. The chroma key and key fill are sent to the Keyer
Module where they are handled the same as any other key. The chroma key
can be sent to any of the three keyers.
Second M/E KeyerÑ
A second M/E keyer is available optionally. It is identical
to the other two keyers and allows a third key to be placed on the video.
BorderlineÑ
A Borderline option can be mounted on each of the Keyer
Modules. The Borderline modifies the timing of the key and inserts a
border or shadow on the key.
Preview MixerÑ The Look Ahead Preview Mixer option operates identically
to the Program Mixer and provides preview video outputs.
Depth SubmoduleÑ The Depth Submodule mounts on the Program or
Preview Mixer and processes depth inputs to create depth keys.
Analog Output Ñ The Analog Output options for the Program and Preview
outputs convert the digital video outputs into a component analog video
signal for driving a monitor.