Tektronix Grass Valley 4000, Installation And Service

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Section 3 — Functional Description
Chroma Keyer Carrier Module (064807)
Each M/E can have a Chroma Keyer option. Each module can create two chroma
keys and key fills (one for each keyer in the M/E) from any primary inputs or
optional external chroma key inputs. The chroma key and key fill are sent to the
Keyer Module where they are selected and handled the same as a luminance key.
The Chroma Keyer:
■
Creates a chroma key and shaped fill for Key 1 of the M/E from any primary
or chroma key video input
■
Does all of the timing and control for the Chroma Keyer Mezzanine
The input signals are serial digital. Signals are converted to parallel on the carrier
module and sent either to the chroma key circuit (Key 1) or the mezzanine board
(Key 2).
The input signals for each Key Carrier Module are:
■
Any of the primary inputs (one key and one fill)
■
Or any of the six chroma key inputs (one key and one fill)
Each of the Chroma Keyer Modules creates:
■
Chroma key
■
Video shaped by the chroma key
The Chroma Keyer outputs are sent to the Keyer Carrier Module and the Keyer
Mezzanine Board. The chroma key uses the linear key on the keyer modules.
The function, inputs, outputs and processor used for each M/E are given below:
M/E Chroma Keyer Module Set
Function of the modules:
Create a chroma key and fill for each M/E.
Inputs:
■
Any of the primary inputs (one key and one fill)
■
Any of the six external chroma key inputs (one key and one fill)
Outputs:
■
Chroma key
■
Video shaped by the chroma key
Processors Used:
■
M/E processor
Chroma Key Mezzanine Board (064831)
The Chroma Key Mezzanine:
■
Creates the chroma key and shaped fill for Key 2 of the M/E