Grass Valley Karrera Video Production Center v.4.0 - Manual (Page 144)

144 KARRERA — User Manual
Section 4 — Switcher Control
Bus Linking
Overview
You can create single and multiple bus links, referred to as Parallel and Cas-
cading links. Also, you can define and associate one of the 15 new definable
Source Substitution Tables to a bus (each bus link can be associated with
any source table), and save bus links as part of an E-MEM. Bus links are
E-MEMable and their enables are Keyframeable.
Note Bus links created and E-MEMs learned using versions earlier than Karrera 2.0
must be rebuilt after an upgrade.
Bus Link is an E-MEM sub-level in the User Setups, Suite Prefs, E-MEM Prefs
menu and therefore all the features and controls of a Karrera switcher sub-
level apply.
Examples
A typical use of Bus Linking is to have the buses of one ME follow the selec-
tions on another with a few source substitutions. For example, if there's a
special camera only used for the primary customer's feed, a Linked bus
used for a secondary customer’s feed might select a wide shot whenever
that camera was selected on the Controlling bus.
Another example is to prevent feedback when selecting a studio wide shot.
Many modern sets include monitors, and these will typically be fed from
an aux bus of the switcher with program output selected. When the wide
shot camera is selected on PGM-PST A bus, the camera might pick up the
monitor wall and generate video feedback. This can be prevented by asso-
ciating all source selections on PGM-PST A except the wide shot camera to
select PGM-PST A on the aux bus. The wide shot camera source is then
associated to an alternative graphics source on the aux bus appropriate to
the show.
Another possibility is to program the ME 3 A row as an extension of the
PGM-PST A bus for shows that need instant access to more than 32 sources
without pressing the Shift button. In this case ME 3 A is the Controlling bus
and PGM-PST A is the Linked bus. In this scenario, the easiest way to set
this up is to link the buses and map the sources one to one, then set the shift
preference for ME 3 A to Shifted. An alternative method is to map each
source on ME 3 A to a specific alternate source on PGM-PST A. Other ME 3
buses could be linked for additional extended selection. A third alternative
is to map all sources on ME 3 A to select ME 3 A on PGM-PST A.