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Glossary
16:9 squeeze
An SD video signal with a 16:9
aspect ratio that is squeezed into
a 4:3 aspect ratio.
Auto gain control
A function which uses the
luminance signal's sync level as
a basis for adjusting the
luminance signal to an
appropriate level. Use this when
the luminance signal level is off
by a significant margin.
Black burst signal
A reference signal used to
achieve external
synchronization (GenLock).
Chroma key
A method of creating a
composite picture by deleting
components that contain a
specified color (chroma).
Typically, a subject is captured
in front of a blue background,
commonly referred to as a "blue
screen," and the blue
background is removed, leaving
only to subject for compositing.
Color bars
A test signal which displays
vertical colored stripes on a
monitor. Used to adjust the hue
and saturation of colors on
video cameras and monitors.
Color matte
A color signal generated by this
unit. The hue, saturation, and
luminance of color mattes can
be adjusted.
Compressor
A function which smoothly
limits audio signals exceeding a
certain threshold. Used to even
out audio signals which contain
large differences in amplitude.
304
Glossary
Default gateway
A router or computer on a
network which serves as an
entrance to an outside network.
Other computers in the network
access the outside network via
the default gateway.
Delay
A function which delays audio
to bring it into synchronization
with video, used when video is
input later than the
corresponding audio.
DHCP (Dynamic Host
Configuration Protocol)
A protocol for automatically
assigning IP addresses to clients
when they connect to a network,
and recovering the addresses
when they disconnect.
Dimmer
A function which slightly dims
a picture or slightly lowers
audio levels.
DNS (Domain Name
System)
A system which allows Internet
domain names to be translated
into IP addresses.
Domain name
An identifier assigned to a
group of computers and
networks on the Internet.
Domain names are delimited by
periods (.), and arranged from
the left in the order top level
domain, second level domain,
third level domain, and so forth.
Downstream key (DSK)
A function which allows
pictures to be composed by
taking video to which an effect
has already been applied and
adding further images and text.
It is called downstream key
because this processing is done
at the very end of the processing
stream.
EDL (Edit Decision List)
Data containing edit
instructions that use timecodes
(time clock information
attached to images) to specify
the order of cuts to be taken
from images.
Embedded audio
Audio that is embedded into a
video signal.
EMC (Electro-Magnetic
Compatibility)
The properties of an electrical
device of electromagnetic non-
interference and
electromagnetic immunity.
Electromagnetic non-
interference means that when
the device operates it does not
impair the operation of other
devices, and does not act as a
source of interference over a
certain level that would be
harmful to human health.
Electromagnetic immunity is
the property of electromagnetic
susceptibility such that the
device can operate without
interference from
electromagnetic radiation and
so forth emitted by other
devices.
Encode
To use compression technology
to create streaming files with
appropriate bitrates for different
bandwidths.
Equalizer (EQ)
A function which controls
specific audio frequencies in the
high, mid, and low regions.
Used to strengthen or delete
specific frequencies in order to
improve the audio.
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