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Section 4— Switcher Operations
Transitions - Mix/Effects Bus Operations
A transition is a change from one combination of picture elements
to another combination. This change can take the form of a cut, a
mix, or a wipe and can be used to switch background scenes or
insert or remove a key. We will use a Mix/Effects bus to
demonstrate basic transitions.
Set up the switcher crosspoint buses as follows for this Transitions
subsection:
1. Select M/E 1 as the source on the PGM bus (this directs M/E
1 outputs to the PGM monitor output), or select M/E 1 on the
A bus of M/E 2 (this directs M/E 1 outputs to the PGM
monitor output).
2. Using the Preview buttons, select M/E 1 (in order to see the
preview or “off-air” source on the Preview monitor).
(Requires the Look-Ahead Preview option.)
Background Cut
A cut is an instantaneous switch from one picture to another. To
cut between M/E 1 bus A (Program) and bus B (Preset)
Background bus sources, do the following:
1. Select M/E 1 on the E-MEM Subpanel. Press CWB twice.
2. Select Source 1 on the A bus background crosspoint row.
Source 1’s video should now be seen on the PGM monitor.
3. Select Source 2 on the B bus background crosspoint row. If
you have the Look Ahead Preview option set up for Look
Ahead mode, Source 2 should now appear on the Preview
monitor.
Preview buttons (typical; 2200
and 4000-3 slightly different)
M/E
2
PVW
DSK
PVW
M/E
1
PVW