Digital TV is an important optional function in car DVD player nowadays. Digital TV include ATSC-
MH,DVB-T ,I-SDB-T and Germany TV.Then how much do you know about this? Next we will introduce Digital
Video Broadcasting(DVB) to you.
Digital Video Broadcasting (DVB) is a suite of internationally accepted open standards for digital
television. DVB standards are maintained by the DVB Project, an international industry consortium with
more than 270 members, and they are published by a Joint Technical Committee (JTC) of European
Telecommunications Standards Institute (ETSI), European Committee for Electrotechnical Standardization
(CENELEC) and European Broadcasting Union (EBU). The interaction of the DVB sub-standards is described in
the DVB Cookbook.Many aspects of DVB are patented, including elements of the MPEG video coding and audio
coding.
DVB systems distribute data using a variety of approaches, including:
satellite: DVB-S, DVB-S2 and DVB-SH
DVB-SMATV for distribution via SMATV
terrestrial television: DVB-T, DVB-T2
digital terrestrial television for handhelds: DVB-H, DVB-SH
microwave: using DTT (DVB-MT), the MMDS (DVB-MC), and/or MVDS standards (DVB-MS)
cable: DVB-C, DVB-C2
These standards define the physical layer and data link layer of the distribution system. Devices
interact with the physical layer via a synchronous parallel interface (SPI), synchronous serial interface
(SSI), or asynchronous serial interface (ASI). All data is transmitted in MPEG transport streams with some
additional constraints (DVB-MPEG). A standard for temporally-compressed distribution to mobile devices
(DVB-H) was published in November 2004.These distribution systems differ mainly in the modulation schemes
used and error correcting codes used, due to the different technical constraints. DVB-S (SHF) uses QPSK,
8PSK or 16-QAM. DVB-S2 uses QPSK, 8PSK, 16APSK or 32APSK, at the broadcasters decision. QPSK and 8PSK are
the only versions regularly used. DVB-C (VHF/UHF) uses QAM: 16-QAM, 32-QAM, 64-QAM, 128-QAM or 256-QAM.
Lastly, DVB-T (VHF/UHF) uses 16-QAM or 64-QAM (or QPSK) in combination with COFDM and can support
hierarchical modulation.
The DVB-T2 specification was approved by the DVB Steering Board in June 2008 and sent to ETSI for
adoption as a formal standard. ETSI adopted the standard on September 9, 2009.The DVB-T2 standard gives
more robust TV reception and increases the possible bit rate by over 30% for single transmitters (as in
the UK) and should increase the max. bit rate by over 50% in large single-frequency networks (as in
Germany, Sweden).
DVB has established a 3D TV group (CM-3DTV) to identify “what kind of 3D-TV solution does the
market want and need, and how can DVB play an active part in the creation of that solution?”. The CM-3DTV
group held a DVB 3D-TV Kick-off Workshop in Geneva on January 25, 2010, followed by the first CM-3DTV
meeting the next day.Besides audio and video transmission, DVB also defines data connections (DVB-DATA –
EN 301 192) with return channels (DVB-RC) for several media (DECT, GSM, PSTN/ISDN, satellite etc.) and
protocols (DVB-IPTV: Internet Protocol; DVB-NPI: network protocol independent).
Older technologies such as teletext (DVB-TXT) and vertical blanking interval data (DVB-VBI) are
also supported by the standards to ease conversion. However, for many applications more advanced
alternatives like DVB-SUB for subtitling are available.
So you can clearly know the Digital Video Broadcasting of a car dvd player. And then decide wheter
need to buy the optioanl function of DVB when buy a car dvd player gps navigation sydtem