ENENSYS showcases, during MWC in Barcelona, its eMBMS Gateway/BM-SC server
MobiStream enable Mobile operators to broadcast Mobile TV services over LTE networks in MBSFN area using eMBMS technology
ENENSYS Provides T2 Gateway and Modulator for KBS Ultra-High Definition Project
MultiChoice Malawi launches GOtv services
GOTV, launches pay television service on DVB-T2 technology in Ghana
Audio Visual Global (AVG) selects ENENSYS for Asia’s first DVB-T2 commercial launch
The newest Pay-TV operator AVG of Vietnam, has selected the ENENSYS DVB-T2 solution for the deployment of the first DVB-T2 commercial launch in Asia
GOTV, a pay television service on DVB-T2 technology has come to town in Lagos
Namibia launch DVB-T2
GOtv, Namibia’s newest pay TV service was launched in Windhoek on the 21st June 2012
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Serbia launch DVB-T2
ETV - a national broadcasting agency in Serbia, started broadcasting its services on March 21st 201 using DVB-T2 technology
Enensys participates to the first T2-Lite plugfest
The plugfest is the opportunity to perform interoperability testing of T2Gateway and modulator implementations using advanced DVB-T2-Lite profile.
Kenya launch DVB-T2
Kenya launched GOtv payTV services using DVB-T2 standard
Velister Ltd relies on ENENSYS SFN solution
Velister DTT network operator in Cyprus deployed ENENSYS secured SFN solution
MULTICHOICE selects ENENSYS for the world's largest DVB-T2 roll-out
GOtv launches in Africa on DVB-T2
Gotv, a product of MultiChoice, is a new digital pay television offering using DVB-T2
MediaCorp selects ENENSYS for DVB-T2 trial network
ENENSYS released T2Edge enabling DVB-T2 regional services over SFN networks
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General Overview of DVB-T
DVB-T rationale
DVB-T (which stands for Digital Video Broadcasting — Terrestrial) is the DVB European-based consortium standard for the broadcast transmission of digital terrestrial television.
The specification is designed primarily for fixed reception to roof-top antennas and has frequency spectrum channel characteristics that are compatible with with Geneva 2006 Agreement. DVB-T has been published as an ETSI standard, EN 300 744. It is built on top of MPEG standards for aiudio/video coding and multiplexing, which are used according to the MPEG guidelines technical specification ETSI TS 101 154. Many countries that have adopted DVB-T have published specifications for its implementation. including the D-Book in the UK, the Italian DGTVi, the ETSI E-Book and Scandivia NorDig.
DVB-T has been further developed into newer standards such as DVB-H (Handheld), now in operation, and DVB-T2, which was recently finalised.
DVB-T baseline features
DVB-T transmits compressed digital audio, video and other data in an MPEG transport stream, using COFDM modulation. The transmission mechanism, which is based on data symbols, uses Multiple Carrier Frequencies. OFDM works by splitting the digital data stream into a large number of slower digital streams, each of which digitally modulate a set of closely spaced adjacent carrier frequencies. In the case of DVB-T, there are two choices for the number of carriers known as 2K-mode or 8K-mode. Within each frequency, DVB-T offers three different modulation schemes (QPSK, 16QAM and 64QAM) which choice is made depending on a robustness versus data rate compromise. The Guard Interval is the duration that allows to separate symbols in time in order to allow the receiver to handle a given amount of delay in the transmission path.
One of the main advantages of OFDM is that it allows the receiver to cope with strong multipath situations. DVB-T also allows single frequency networks (SFN) operation within a given geographical area, where two or more transmitters carrying the same data operate on the same frequency. In such cases the signals from each transmitter in the SFN needs to be accurately time-aligned, which is done by sync information in the stream and timing at each transmitter using the GPS timing reference. The Guard Interval length can be chosen according to a trade-off between data rate and SFN capability : the longer the guard interval, the larger the potential SFN area.
DVB-T adoption.
Defined initially as a European norm, DVB-T has been adopted or proposed for digital television broadcasting by many countries throughout the world.
References:
- DVB website : http://www.dvb.org/technology/standards/
- Wikipedia : http://en.wikipedia.org/wiki/DVB-T