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By comparison, the rival DigiCipher 2 based ATSC system will not have this issue until 2048 due in part to 32 bits being used. The dating system used with this metadata suffers from a year 2038 problem in which due to the limited 16 bits and modified Julian day offset used will cause an overflow issue similar to the year 2000 problem. ĭVB transports include metadata called Service Information (DVB-SI, ETSI EN 300 468, ETSI TR 101 211) that links the various elementary streams into coherent programs and provides human-readable descriptions for electronic program guides as well as for automatic searching and filtering. DVB-CPCM has been the source of much controversy in the popular press and it is said that CPCM is the DVB's answer to the failed American Broadcast Flag. Multiple simultaneous CA systems can be assigned to a scrambled DVB program stream providing operational and commercial flexibility for the service provider.ĭVB is also developing a Content Protection and Copy Management system for protecting content after it has been received ( DVB-CPCM), which is intended to allow flexible use of recorded content on a home network or beyond, while preventing unconstrained sharing on the Internet. DVB-CA providers develop their wholly proprietary conditional access systems with reference to these specifications. The conditional access system (DVB-CA) defines a Common Scrambling Algorithm (DVB-CSA) and a physical Common Interface ( DVB-CI) for accessing scrambled content. However, for many applications more advanced alternatives like DVB-SUB for subtitling are available. Older technologies such as teletext (DVB-TXT) and vertical blanking interval data (DVB-VBI) are also supported by the standards to ease conversion. Digital audio content is encoded using modified discrete cosine transform (MDCT) based audio coding standards, such as Advanced Audio Coding (AAC), Dolby Digital (AC-3) and MP3.īesides digital audio and digital 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). Single carrier, PSK or APSK, multiple streamsġ/4, 19/256, 1/8, 19/128, 1/16, 1/32, 1/128ĭigital video content is encoded using discrete cosine transform (DCT) based video coding standards, such as the H.26x and MPEG formats. Variable coding & modulation and adaptive coding & modulation Multiple transport stream and generic stream encapsulation (GSE) Modes and features of latest DVB-x2 system standards in comparison: DVB now defines a new standard for 3D video broadcast: DVB 3D-TV.
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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 will increase the maximum bit rate by over 50% in large single-frequency networks (as in Germany and Sweden).ĭVB 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 25 January 2010, followed by the first CM-3DTV meeting the next day. ETSI adopted the standard on 9 September 2009. The DVB-T2 specification was approved by the DVB Steering Board in June 2008 and sent to ETSI for adoption as a formal standard. Lastly, DVB-T (VHF/UHF) uses 16-QAM or 64-QAM (or QPSK) in combination with (C)OFDM and can support hierarchical modulation. QPSK and 8-PSK are the only versions regularly used. DVB-S2 uses QPSK, 8-PSK, 16-APSK or 32-APSK, at the broadcasters decision. DVB-S ( SHF) uses QPSK, 8-PSK or 16- QAM. These distribution systems differ mainly in the modulation schemes used and error correcting codes used, due to the different technical constraints. A standard for temporally-compressed distribution to mobile devices (DVB-H) was published in November 2004. All data is transmitted in MPEG transport streams with some additional constraints (DVB-MPEG).
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Devices interact with the physical layer via a synchronous parallel interface (SPI), synchronous serial interface (SSI) or asynchronous serial interface (ASI). These standards define the physical layer and data link layer of the distribution system. Microwave: using DTT ( DVB-MT), the MMDS ( DVB-MC), and/or MVDS standards ( DVB-MS).
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