Matrox DigiSuite LE, Installation Manual, Page: 122 / 140

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Appendix B, DigiSuite Glossary
contrast
The difference in brightness between
the lightest and darkest areas of an image on the
screen.
control track
A continuous, stable, low-
frequency signal recorded onto tape. It is used to
identify frame locations and control the playback
of the video signal.
crawl
Sideways movement of text across a
screen. See also roll (1).
cut
A direct switch from one video and/or audio
source to another.
D
Digital-S
A professional variant of the DV
format developed by JVC that uses a data rate of
50 Mb/sec (6.25 MB/sec), which is double the data
rate of most other DV formats. Video is sampled at
4:2:2 for both NTSC and PAL sources to give
enhanced chroma resolution. It uses a 1/2” metal
particle tape.
digital signal
A signal representing video or
audio information as binary digits that can be
easily regenerated with no noise or distortion. See
also analog signal.
Digital Video
See DV.
digitize
To convert analog information, such as
a video signal from a VTR, into digital
information that can be processed and stored by a
computer.
dissolve
A transition in which one image
smoothly fades to another image. It is
characterized by the gradual ending of one image
occurring simultaneously with the gradual
beginning of another.
DMC
Dynamic Motion Control. The ability to
change the playback speed of video and audio
clips.
drop-frame time code
For NTSC video, time
code is normally produced by a generator that
counts at 30 frames per second. NTSC color
signals, however, actually have a display
frequency rate close to 29.97 frames per second.
Drop-frame time code compensates for this time
difference by dropping two frames from the count
every minute except for every tenth minute so that
the time code matches clock time.
DV
Digital Video. A standard digital bit stream
and compression format used for recording video
and audio onto a digital tape. DV is intra-frame
based, saving each frame separately, and uses a
fixed 5:1 compression ratio to reduce the size of
video files. DV’s data rate is fixed at 25 Mb/sec
(3.13 MB/sec). Video is sampled at 4:1:1 for
NTSC sources or 4:2:0 for PAL sources. See also
DVCAM, DVCPRO, DVCPRO50, and Digital-S.
DVCAM
A professional variant of the DV format
developed by Sony that records a 15 micron track
on a metal evaporated (ME) tape at a data rate of
25 Mb/sec (3.13 MB/sec). Video is sampled at
4:1:1 for NTSC sources or 4:2:0 for PAL sources.
DVCPRO
A professional variant of the DV
format developed by Panasonic that records an 18
micron track on metal particle tape at a data rate of
25 Mb/sec (3.13 MB/sec). Video is sampled at
4:1:1 for both NTSC and PAL sources.
DVCPRO50
A professional variant of the DV
format developed by Panasonic that uses a data
rate of 50 Mb/sec (6.25MB/sec), which is double
the data rate of most other DV formats. Video is
sampled at 4:2:2 for both NTSC and PAL sources
to give enhanced chroma resolution. It uses the
same type of tape as DVCPRO.
DVE
Digital Video Effect. Generally, an effect
that resizes and repositions a picture on the screen.
On DigiSuite, a 2D DVE is referred to as a “video
window.”
DVE move
Making a picture shrink, expand,
tumble, and/or move across the screen.