GRASS VALLEY zodiak, User Manual

Page: 36 / 458

36 Zodiak User Manual
Section 2 — Concepts
Buttons on a control panel can be used to control the switching of cross-
points. The buttons are usually arranged horizontally, making it easy to
imagine the available signals coming in from the top, and the single bus
output signal going out the right side.
In earlier generation switchers, the terms crosspoint button and crosspoint bus
have been used in reference to control panel source selection. For a Zodiak
system, the terms source button and source bus will be used. These terms
better reflect a system operating philosophy that is source rather than cros-
spoint based. The Zodiak system does not directly associate a source select
button with a physical crosspoint. The association goes first through source
to button mapping, then through source definition to find the physical
inputs.
On the Zodiak system, a single source button can control crosspoints on
different buses simultaneously. For example, during keying on an M/E,
both the video and key signals of a source can be selected with a single
button press. In this case two different crosspoints on separate buses (key
fill bus and key cut bus) are actually switched when the button is pressed.
In the upper part of Figure 11 , the video component of source 2 in the figure
has been selected on the key fill bus and becomes the key fill signal for sub-
sequent keying. The key component of source 2 selected on the key cut bus
becomes the key cut signal for keying. The lower part of
Figure 11 shows
how the same source (source 4) can be selected for both the key fill and key
cut signals.
Figure 11. Multiple Crosspoint Control
Source Signal Inputs
Key
1 2 3 4 5
Key Video Key Video Video Only Video Only Video
0618_00_21_r1
Key 1 Fill Bus
2 1 3 4 5
Key 1 Cut Bus
Single Button Controls Both Crosspoints
Single Button Sends Same Signal to Both Buses
Key 2 Fill Bus
2 1 3 4 5
Key 2 Cut Bus