A08 - 25.09.2015
VTQ WMS HD - V/G-Mount TX
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» ETSI
(“European Telecommunications Standards Institute”)
The ETSI is a charitable institute founded to set Europewide standards regarding telecommunication. It was
founded in 1988 on the initiative of the European Committee. It has over 700 members of over 50 countries
inclusive operating companies, service providers, administrations, and producers.
» FBAS
(composite colour picture signal)
The FBAS signal identifys the entire TV signal that is required for the colour – image transmission. It consits of a
colour signal (F), image signal (B), blanking signal (A) and the synchronous signal (S). In English: CVBS
(Colour Video Blanking Signal).
» FEC
(“Forward-Error-Correction”)
This technology is used to reduce the error rate regarding digital data transmission. In the transmitter the
transmission data is coded by the Forward Error Correction so that the receiver is able to recognize and correct
the errors. It is used e.g. on compact discs (CD) or for wireless transmissions.
» Guard Interval (GI)
The guard interval is one of the most important parameters for robustness of the COFDM-signals. It is inserted
between two successive symbols and thereby avoids interference by echoes.
» GoP
(„Group of Picture“)
At this kind of compression pictures for different purposes are compressed at different levels The I-pictures are
compressed regardless of the other pictures. These are the biggest pictures. All other pictures are reduced in
size in regard of other pictures in the video stream. These different kinds of pictures are used in different
frequencies. Typically they appear as so-called GOP (Group of Pictures). One GOP reaches from one I-picture
to the next. Often they have a length of half a second.
» H.264
H.264 (MPEG-4 AVC) is a standard in videocompression. It performs with an approximately 3 times higher
coding efficiency than MPEG2 (h262). This means that with only a third of the data rate compared to MPEG2 a
similar picture quality is achieved. At the same time the computing effort increases by up to the factor 3.
A1. Glossary
Glossary