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OVERVIEW
8083XDS-AD Analog and SD-SDI XDS Encoder
TRS: Timing reference signals used in composite digital systems. (It is
four words long).
TRS-ID:
Abbreviation for "Timing Reference Signal Identification". A
reference signal used to maintain timing in composite digital systems. (It is
four words long.)
UNIVERSAL COORDINATED TIME
UNIVERSAL TIME, COORDINATED (UTC): Universal Coordinated Time
(UTC) is an international time standard that defines a time that doesn't
depend on where we are on Earth. Universal Time (UTC), Greenwich
Mean Time (GMT), and Zulu Time (Z), are based at the prime meridian (0°
longitude) of Earth and are used to avoid confusion of time zones.
VANC:
Vertical Ancillary data. Data carried in serial digital video
signal (SMPTE 259M or 292M), in accordance with SMPTE 291M, in the
active portion of scan lines that are outside the active picture area.
VBI:
Vertical Blanking Interval. The scan lines that are outside the active
picture area of a standard definition video signal (analog or serial digital).
These can be used for carriage of data, including closed captioning, in
analog video broadcasting.
V-Chip:
Abbreviation for "Viewer Chip" (commonly misread as
"Violence Chip"). V-Chip-enabled television sets extract Program Rating
packets from the XDS data stream in Field 2 captions to determine the
rating of a show. Also see Extended Data Services.
WebTV:
The encoding of URL (Uniform Resource Locators) normally
used on the Internet, into line 21 caption style data. This URL string is
made up with the familiar http:// followed by a target location on the
Internet. The URL must be formatted to match the Electronic Industries
Association specification EIA-746-A.
XDS: See Extended Data Services.
4:2:2 A commonly used term for a component digital video format. The
details of the format are specified in the ITU-R601 standard. The numerals
4:2:2 denote the ratio of the sampling frequencies of the luminance channel
to the two colour difference channels. For every four luminance samples,
there are two samples of each colour difference channel.
4Fsc Four times subcarrier sampling rate used in composite digital
systems. In NTSC this is 14.3 MHz. In PAL this is 17.7 MHz.
Revision 1.0.2
Page 1-11
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