Glossary - Sony DME-3000 Product Manual

Glossary

DME-3000/7000 • Product Guide
4:2:2
The ratio between the digital component video sampling frequencies, specified in
CCIR-601, for main digital studio equipment. The frequencies are 13.5 MHz for
Luminance, and 6.75 MHz for each of the two Chrominance signals.
4:2:2:4
A signal which consists of a 4:2:2 signal for Luminance and Chrominance
information plus a key signal sampled at the same rate as the luminance signal.
4:4:4:4
A digital video signal which has identical sampling rates for the luminance,
chrominance, and key signals.
Archive Recorder
Also known as "cache" recorder. Special designation for a recorder in which all
events are recorded sequentially, without overlaps. Used to preserve each layer
during complex multi-layer sequences.
Auxiliary Bus
Also called "Aux" buses, auxiliary buses are extra switching buses that allow video
signals connected to the switcher to be routed to external equipment such as digital
effects systems and VTRs. Some switchers such as the DVS-2000C have multiple
Aux buses as an option.
B-roll
Essentially a copy of a clip or a sequence. Without the availability of pre-read, the
"to" and "from" sources in a transition must be on separate reels. If they are not, a
B-roll must be made in order to perform the transition.
Background
One of the video sources involved in keying. Specifically, the background video is
the signal which has portions of it replaced with the key (or foreground) signal.
Using chroma key as an example in a weathercast, the background is the weather
map and the foreground is the weathercaster. The foreground signal is often
referred to as cutting a "hole" in the background video signal.
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