Grass Valley Kayak HD v.6.9.3 - Manual (Page 42)

42 Kayak — User Manual
Section 2 — Concepts
Buttons on a control panel can be used to control the switching of cros-
spoints. 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 Kayak system, the terms source button and source bus will be used.
These terms better reflect a system operating philosophy that is source
rather than crosspoint based.
The Kayak 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 Kayak system, a single source button can control crosspoints on dif-
ferent buses simultaneously. For example, during keying, 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 14 below, the video component of source 2 in the
figure has been selected on the key fill bus and becomes the key fill signal
for subsequent 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 14
below shows how the same source (source 4) can be selected for both the
key fill and key cut signals.
Figure 14. Multiple Crosspoint Control
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