evertz EQT Series, System Manual

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EQT Router User Manual
Revision 1.9.1
Page 5
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 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: 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 equals 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 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 (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.
SMPTE 125M: The SMPTE standard for bit parallel digital interface for component video signals.
SMPTE 125M defines the parameters required to generate and distribute component
video signals on a parallel interface.
SMPTE 259M-C: The SMPTE standard for 525 and 625 line serial digital component and composite
interfaces.