Sony DVS-7300 User Manual page 128

Keys
Processed key function
The term "processed key" refers to the function whereby a keyer in a
switcher operates in combination with an external DME unit to apply a DME
effect to a key. This function is not available on the downstream keyer.
When the processed key function is enabled, before combination with the
background, the key fill and key source signals produced by the switcher
keyer (with borders, shadows and other processing already effected) are
output to the DME from the switcher auxiliary buses. These signals are
subjected to DME processing to add extra effects, and then returned to the
switcher. Finally the signals returned from the DME undergo further
processing and are then combined with the background.
Since the same keyer is used both for the initial processing and for the
processing of the signals returned from the DME, you can use both keyers on
an M/E bank simultaneously, for greater efficiency.
Key snapshots
You can instantly save all of the key settings, except the M/E bank key on or
off state, in a dedicated register, and recall them as required.
For details of saving and recalling key snapshots, see the section "Key
snapshot operations" (page 4-70).
Key memory function
For each signal selected as a key source on an M/E bank, this function
automatically saves the parameters (Clip, Gain, and Density, Filter, Left Pos,
and Right Pos, or Size, Softness, and Density) in memory. When you select
the same signal again, the parameters are recalled with it. Different sets of
parameters are saved, depending on the combination of key source, keyer,
and key type.
You can use a setup menu (see page 14-38) to toggle the key memory
function on and off.
4-44
Chapter 4 Basic Operations for Image Creation