Matrox RT2000 Installation & User Manual page 275

assemble editing Recording new video
and audio material sequentially onto tape.
Because all the signals are recorded (video,
audio, and control track), the new material
completely replaces any previously recorded
material on the tape. See also insert editing.
attenuation A decrease in an electrical
signal's amplitude.
AVI Audio Video Interleaved. A video file
format designed for the Microsoft Windows
environment. See also codec.
A/V drive A hard drive capable of storing
high-bandwidth audio/video data.
B
B-frame (Bi-directional frame) A frame
created during the MPEG or MPEG-2 IBP
compression process. A B-frame is generated
by forwards and backwards referencing of the
P-frames and I-frames respectively, which
allows it to have the highest compression ratio
of the three frame types. B-frames contain
only predictive data (that is, not enough data
to make up an entire picture), and therefore
cannot be edited independently. See also I-
frame (Intra-frame) and P-frame (Predicted
frame).
BIOS Basic Input/Output System settings
for system components, peripherals, etc. This
information is stored in a special battery-
powered memory and is usually accessible for
changes at computer start-up.
bitmap A graphics image in which a set of
values defines each pixel's relative brightness
and color.
blackburst A composite video signal that
combines the sync information of a basic
video signal with a pure black signal. Used as
a reference in synchronizing the different
video sources in a system. Also called color
black.
Blue Book standard See DV.
burnt-in time code Time code that's
superimposed onto each frame of video,
generally created using the overlay feature of
a VTR. Used for rough-cut and edit-list
processing. Also called burn in.
bus A shared set of hardware lines that lets
different parts of your computer transfer
information between one another. A card
inserted into an expansion slot of your
computer makes an electrical connection to
the bus and effectively becomes part of your
computer system.
C
capture The process of digitizing video or
audio material, usually from a VTR, and
storing it in a file on a hard disk.
character generator A device or computer
program used to create text that can be
overlaid onto video.
chroma key An effect that makes portions
of a foreground image fully or partially
transparent based on the color of that image
(or another source), so that an underlying
image can show through. See also key source,
self-key, and filled key.
chrominance The color portion of a video
signal that carries the hue and saturation
information. See also luminance.
codec Compressor/decompressor. A
processor that compresses video to reduce its
file size by eliminating redundancies in
information. It also decompresses files to play
them back.
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RT2000 Glossary