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OVERVIEW
Models 8084/8084AD/8085 Closed Caption Encoder Manual
TRS:
Timing reference signals used in composite digital systems.
(It is four words long).
TRS-ID:
Abbreviation for "Timing Reference Signal Identification".
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.
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 1.6.6
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