3-20
Section 3 — Functional Description
Serial video from the Crosspoint Modules:
■
One background video and its key source
■
One key and its video fill
Parallel video from the Keyer Mezzanine Board:
■
A clipped, gained and masked key and a shaped video for the background
■
A clipped, gained and masked key and a shaped video for the key
The incoming video and keys from the Crosspoint Module are first converted from
serial to parallel. Next, there are selectors that select between the Chroma Keyer
and the Crosspoint Module. The selected video and key are then sent to the Keyer
Mezzanine Boards. The parallel video outputs of the Keyer Carrier Module are
sent to the Mixer Interface Module.
On the Keyer Mezzanine Board the video is separated into luminance and chroma.
All videos are timed together and all keys are timed together. The video then goes
through processing for gain and offset and coring for noise reduction. The key is
clipped and gain adjusted, and the video is shaped by its key. Masks are added,
then the signal goes off the Keyer Mezzanine Board and sent back to the Keyer
Carrier Module.
Each Key Carrier Module is identical and thereby interchangeable for
troubleshooting purposes. The functions, inputs, outputs and processor used for
the Key Carrier Modules in the M/Es are outlined below in general terms.
M/E Key 1 Keyer Carrier Module
Function of the module:
This module (along with its submodules) generates key signals for the individual
M/E A Background and Key 1
Inputs:
■
M/E Background A Video and Background A Key source
■
M/E Key 1 Video and Key 1 source
■
Chroma key video and key
Outputs:
■
Shaped M/E Background A Video Fill
■
M/E Background A Key
■
Shaped M/E Key 1 Video Fill
■
M/E Key 1
Processors Used:
■
M/E Processor
Summary of Contents for Grass Valley 4000
Page 3: ...iii Tektronix Grass Valley Products P O Box 1114 Grass Valley CA 95945 916 478 3800 ...
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Page 138: ...2 104 Section 2 Installation ...
Page 196: ...3 58 Section 3 Functional Description ...
Page 286: ...Index 6 Index ...