Dual core
Physically, the Processor dual core is very similar to a standard processor, except that it is topped by two dies instead of one. The die is sometimes covered with a protective plate, it is not always possible to distinguish at first glance a dual core processor classic.
However, it is impossible to use a dual core processor on a motherboard present, even if the socket is identical. We need the Chipset motherboard is equipped to handle the dual core.
Duplex
Transmission of information in both directions simultaneously.
DVB
Abbreviation Digital Video Broadcasting. This technology includes an additional letter to define the type of disseminationC (DVB-C cable), T (DVB-T Terrestrial or more commonly known TNT), S (DVB-S satellite), H (DVB-H handled) and recent HS (DVB-SH : Satellite services for mobile devices). The DVB is a system of dissemination of digital video.
DVB-H
The DVB-H (Digital Video Broadcasting - Handeld) is a technology standardized by theETSI 2004 (EN 302 304). Major competitor systems DMBIt is primarily an evolution of DVB-T (Digital Video Broadcasting - Terrestrial) standard to serve media content to fixed terminals.
New compared to DVB-T
In response to a use in a mobile situation, three new marks a change from the latter:
• The data stream is transmitted by time-division form of gusts which allows the receiver reduce energy consumption (a factor of 10 by some estimates) by switching to standby mode;
• She sees introduce coding of error MPE-FEC (redundancy bits of information and data protection type RS) To ensure a good reception quality even at high speeds or when handover ;
• New game modulations Q-PSK, 16-QAM and 64QAM.
Hence a particularly strong signal, which improves the reception quality at breast height
Compression and bands
The video compression standard by cons is not specified but may be of type MPEG-4, MPEG-2 or VC-1. In terms of bands frequencies, Bands UHF (IV and V) allow a height ofantenna integrated into mobile phones. Tests are also conducted in L-Band in the USA. The DVB-H promises flow of about 11 Mbps.
A very important advantage of DVB-H is very close proximity with the DVB-T: the same modulators / transmitters / antennas can be used, synergies can be developed for the production of receptors and growth of the coverage area one of two standards will accompany the other to facilitate its deployment.
The DVB-H also works hand in hand with the " IP Datacast Forum, whose goal is to promote IP technology for broadcast by broadcasting any content on IP-layer DVB-H, which would facilitate the interconnection of networks and digital convergence.
Testing and deployment
The direction in Europe is clearly towards the DVB-H, which would receive more channels than its counterpart DMB (thirty cons ten). The receivers are also less greedy (consumption three times lower).
Many experiments are taking place all over the world: Germany, Italy, Australia, South Africa, USA ... In Italy a commercial service was launched during the World Cup but success remains uncertain, according to some analysts. The coverage would be about 65% of the population. There is also the case of England with a commercial service to approximately 16 video channels.
In France, tests were conducted by mobile operators with a consortium led by SFR and Canal + in 2005. And the recent passage of the bill (enacted March 7) on the modernization of the dissemination audiovisual and television of the future confirms the popularity DVB-H. The government's timetable is clear: Bill, the CSA consulted for spectrum allocation, allocation and deployment of the network to be operational for the World Cup Rugby in September 2007. The spread is based on the UHF band (see complementarity DVB-T and DVB-H). |
