evertz 570DSK-12G-F, User Manual

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570DSK-12G-F
Keyer With Logo Insertion
Page 44
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, and
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: Abbreviation for European Broadcast Union, an organization 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.
NTSC: The 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 (Note – two fields is
equal to 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: Abbreviation for Phase Alternating Line, the television and video
standard in use in most of Europe. It consists of 625 horizontal lines at
a field rate of 50 fields per second (Note – two fields is equal to one
complete frame). Only 576 of these lines are used for picture. The rest
are used for sync or extra information such as VITC and Teletext.
PIXEL: The smallest distinguishable and resolvable area in a video image. A
single point on the screen. In digital video, a single sample of the picture.
Derived from the words
picture element.
SMPTE: Abbreviation for Society of Motion Picture and Television Engineers, a
professional organization that recommends standards for the film and
television industries.
SMPTE 12M: The SMPTE standard for time and address code. SMPTE 12M defines
the parameters required for both linear and vertical interval time codes.