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