7700 Multiframe Manual
7725DSK-LG / 7725DSK-LG-HD HD/SD Logo Inserter & Media Keyer
Page 1-4 Revision 1.4 OVERVIEW
D2: A composite digital video recording format that uses data conforming to SMPTE 244M.
Records on 19 mm magnetic tape. (Often used incorrectly to refer to composite digital
video.)
D3: A composite digital video recording format that uses data conforming to SMPTE 244M.
Records on 1/2" magnetic tape.
D5: A component digital video recording format that uses data conforming to the ITU-R601
standard. Records on 1/2" magnetic tape.
Drop frame: In NTSC systems, where the frame rate is 29.97002618 frames per second, the drop
frame mode permits time of day indexing of the frame numbers by dropping certain frame
numbers. Specifically frames 0, and 1 at the beginning of each minute except minutes
0,10,20,30,40, & 50, are omitted, to compensate for an approximate timing error of 108
frames (3 seconds 18 frames) per hour. A flag bit is set in the time code to signal when the
drop frame mode is in effect.
EBU (European Broadcasting Union): An organisation of European broadcasters that among
other activities provides technical recommendations for the 625/50 line television systems.
Embedded audio: Digital audio is multiplexed onto a serial digital video data stream.
ITU: The United Nations regulatory body governing all forms of communications. ITU-R
(previously CCIR) regulates the radio frequency spectrum, while ITU-T (previously CCITT)
deals with the telecommunications standards.
ITU-R601: An international standard for standard definition component digital television from which was
derived SMPTE 125M and EBU 3246-E standards. ITU-R601 defines the sampling
systems, matrix values and filter characteristics for Y, B-Y, R-Y and RGB component digital
television signals.
Letterbox: Placing a wide screen image on a conventional TV by placing black bands at the top and
bottom of the screen.
Linear time code: (Also known as Longitudinal Time Code) A digital code used for timing and
control purposes on videotape and associated audio tape machines. It is recorded on a
linear track with audio characteristics and is referred to as LTC. Each 80 bit code word is
associated with one television frame, and consists of 26 time bits, 6 flag bits, 32 user bits
and 16 sync bits. This time code may run at 24, 25 or 30 frames per second depending on
the video format. See also SMPTE 12M
LTC: See Linear Time Code
NTSC: National Television Standards Committee established the television and video standard in
use in the United States, Canada, Japan and several other countries. NTSC video consists
of 525 horizontal lines at a field rate of approximately 60 fields per second. (Two fields equal
one complete Frame). Only 487 of these lines are used for picture. The rest are used for
sync or extra information such as VITC and Closed Captioning.
PAL: Phase Alternating Line. The television and video standard in use in most of Europe.
Consists of 625 horizontal lines at a field rate of 50 fields per second. (Two fields equal one
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