Digital TV technical terms

[vinboy]

Technical terms:
DVB Digital Video Broadcasting - a family of digital transmission standards covering satellite, cable and terrestrial broadcasting.
DVB-C is an acronym for Digital Video Broadcasting - Cable and means basically the digital TV broadcasting method that's done via digital cable networks.
DVB-S is an acronym for Digital Video Broadcasting - Satellite and means basically the digital TV broadcasting method that's done via satellite.
DVB-T is an acronym for Digital Video Broadcasting - Terrestial and means basically the digital TV broadcasting method that's done via terrestial networks -- normally existing analogue TV antennas are used to receive the transmissions.
Set Top Box Receiver/decoder used to convert digital signals to present television formats. Can provide conditional access control and advanced features such as interactive applications.
UHF Ultra High Frequency - a band of frequencies from 500-800 MHz used for television broadcasting, including Sky terrestrial, Prime, TAB and regional non-commercial broadcasts.Reference Sources:
http://www.afterdawn.com/
http://www.executive.govt.nz/minister/hobbs/digital/glossary.htm

[nickrout]

Wikipedia is a good source of info, but here are a few more terms that often confuse people, and are often used in the wrong context:

6. MPEG-2 is the video standard used on DVD's and for many digital TV services. Both Freeview over DVB-S and Sky TV presently broadcast MPEG-2 streams from the Optus D1 satellite.

7. H.264 is a video standard also known as MPEG-4 Part 10 or AVC (Advanced Video Codec). It is a more advanced codec than MPEG-2 and can provide a better quality per bitrate than MPEG-2. Freeview will be broadcasting their DVB-T streams using the H.264 Codec, and will be capable of High Definition.

8. Codec is a term used for a system to compress and decompress a digital stream such as video or audio.


Typical video codecs are MPEG-2 Part 2 (as found on DVD's), MPEG-4 Part 2 (as often found in digital video files, implementations of this codec include XviD, DivX, 3ivx), H.264 (as found in PSP and Ipod video files, and as will be used for Freeview's DVB-T transmissions) and Theora


Audio codecs include mp2 (as found on DVD's), mp3, AC-3, AAC and vorbis.


Video and audio (and perhaps subtitles and other metainfo) are packed into a container format. Containers are often confused with codecs, it is important to recognise the difference.

9. Container format (or just container or just format). The video and audio is compressed via codecs and then multiplexed or muxed into a container, along with information about timing, and perhaps metadata like title and artists, copyright info and subtitles. Common container formats are AVI, MP4, MOV, MPEG, OGG, RealMedia and are usually distinguished by the file extension.

10. Muxing and demuxing is the process of wrapping different multimedia streams into a container, and unwrapping it again into the constituent streams. An encoding program must mux the streams together to make an easily portable and/or streamable file. A player must demux the streams and then decode them into something playable by a speaker and/or screen. Editing software also needs to demux the streams so that it can work on the audio and video separately, and then will need to mux them back again.

[MrElectricity]

Azimut
This is the dish position in respect to north. It is measured in degrees.

Elevation
This is the satellite signal beam inclination that reaches the dish. It is measured in degrees. To adjust it, you must have a look at the numbers on the rear side of the dish.

Polarisation / LNB Skew
The polarisation is the LNB rotation in respect to floor. It is measured in degrees.

[Injuised]

Azimut
This is the dish position in respect to north. It is measured in degrees.

Elevation
This is the satellite signal beam inclination that reaches the dish. It is measured in degrees. To adjust it, you must have a look at the numbers on the rear side of the dish.

Polarisation / LNB Skew
The polarisation is the LNB rotation in respect to floor. It is measured in degrees.

You might want to adjust your AZIMUTH MrElecricity

[MrElectricity]

You might want to adjust your AZIMUTH MrElecricity

:oPicky picky it's only spelling;)

[MrElectricity]

A geostationary orbit (GEO) is a geosynchronous orbit directly above the Earth's equator (0° latitude), with orbital eccentricity of zero. From the ground, a geostationary object appears motionless in the sky and is therefore the orbit of most interest to operators of artificial satellites (including communication and television satellites). Due to the constant 0° latitude, satellite locations may differ by longitude only.

The idea of a geosynchronous satellite for communication purposes was first published in 1928 by Herman Potočnik. The geostationary orbit was first popularised by science fiction author Arthur C. Clarke in 1945 as a useful orbit for communications satellites. As a result this is sometimes referred to as the Clarke orbit. Similarly, the Clarke Belt is the part of space approximately 35,786 km above mean sea level in the plane of the equator where near-geostationary orbits may be achieved.

Geostationary orbits are useful because they cause a satellite to appear stationary with respect to a fixed point on the rotating Earth. As a result, an antenna can point in a fixed direction and maintain a link with the satellite. The satellite orbits in the direction of the Earth's rotation, at an altitude of approximately 35,786 km (22,240 statute miles) above ground. This altitude is significant because it produces an orbital period equal to the Earth's period of rotation, known as the sidereal day.