evertz hd9084, Инструкция по эксплуатации

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HD9084 HDTV Caption Encoder Manual
Page 7-6 GLOSSARY
VANC: Vertical Ancillary data. Data carried in serial digital video signal (SMPTE 259M-C 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 CEA-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 sub-carrier sampling rate used in composite digital systems. In NTSC this
is 14.3 MHz. In PAL this is 17.7 MHz.
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