Tektronix 2200 Manual Do Utilizador

3-25

The Analog Chroma Key input Module allows up to two component 
analog inputs to be used as chroma keys. The inputs are converted to full 
bandwidth digital video and are sent to both of the chroma keyers. The 
analog input formats that are supported are: 

■

RGB 

■

SIMPTE 

■

BETA 

■

MII 

■

EBU 

A Mix/Wipe Module is provided for each of the two M/Es, (two total). The 
Mix/Wipe Module uses the video signals, key signals and the wipe control 
signals to create a video output with all the requested elements. The Mix/
Wipe Module accomplishes the following: 

■

Combines video signals, key signals, and the wipe solid signal to create 
the program video 

■

Interfaces to the Wipe Mezzanine Modules (one standard, one 
optional)

■

Does preview processing for that M/E 

■

Converts output video from parallel to serial 

The Mix/Wipe circuit board has connectors for two Wipe Mezzanine 
Modules and one Preview Module. 

The Mix/Wipe Module has its own microprocessor, program memory 
(flash PROM), and dual port memory. The system processor sends 
information to the dual port memory indicating what is to be done during 
the next field. The Mix/Wipe processor reads this information and does the 
calculations necessary to accomplish the operations and sends the 
information to the rest of the module and the mezzanine modules. 

The Mix/Wipe Module routes the output of each Wipe Mezzanine into the 
other Wipe Mezzanine. This allows the mezzanine modules to do a mix or 
a NAM (Non Additive Mix) between the outputs of the two mezzanine 
modules. See