Tektronix 2200 Manual Do Utilizador

3-28

The Preview Module has several functions: 

■

A dedicated preview output for each M/E

■

Preview Router – the Preview Module can route M/E 1 preview, M/E 
2 preview, or any Crosspoint Module input onto the Switched Preview 
Output Bus 

■

Generates color black 

■

Two color background generators (can do a wash between the two 
backgrounds) 

■

Generates eight test patterns (with split screen) 

■

Generates four safe title patterns 

■

Generates clipped mask and delayed mask 

The video outputs are component serial digital video. The preview signals 
are available on the Output Modules. The mask signals are available 
internally. The other signals are available at the Crosspoint Module via the 
Reentry Module. 

The preview router section of the module will send one of the four router 
inputs to the switched preview output bus. Before being sent to the selector 
the signals are processed as follows: 

■

M/E 1 preview and M/E 2 preview inputs are demultiplexed into Y 
and C. 

■

The input from the Crosspoint Module is deserialized and autotimed to 
the other three inputs

Processors used:

■

The Preview Module uses the HOS Processor 

The Mask Mezzanine Board mounts on the Preview Module and provides 
clip, gain, and autotiming for the key masks. 

Inputs: 

■

Mask Bus 

Outputs: 

■

Dedicated Mask Bus Output 

■

Clipped Mask Bus Re-entry