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Electronics & Communication Engineering Journal

Issue 1 • Date Feb 1997

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Displaying Results 1 - 11 of 11
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  • The DVB project: philosophy and core system

    Page(s): 5 - 10
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (644 KB)  

    The DVB (Digital Video Broadcasting) project was established to develop comprehensive specifications for digital television broadcasting. In three years it has completed work on a range of specifications covering broadcast delivery by all currently used means. The systems are founded on the MPEG-2 coding and multiplex specifications. Additional elements have been added to meet specific broadcasting requirements. The first DVB services in Europe, and in other parts of the world using the systems, will be of conventional quality, but the DVB systems can be used for transporting any data content, or image and sound formats, required by the programme service provider, including HDTV View full abstract»

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  • DVB-T: the COFDM-based system for terrestrial television

    Page(s): 28 - 32
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (752 KB)  

    In early 1996, the European DVB (Digital Video Broadcasting) Project finalised what is now called the `common 2k/8k specification' for terrestrial television transmission. This specification is an important cornerstone of digital video broadcasting in Europe and numerous other countries in the world. Called DVB-T, it is based on the channel-coding algorithms the DVB Project had earlier devised for digital television on cable and satellite. The modulation scheme that is used for DVB-T is OFDM (orthogonal frequency division multiplexing), which when used in conjunction with channel coding is known as COFDM. Two variants are described, one employing 1705 individual carriers in an 8 MHz channel (`2k variant'), the other employing 6817 carriers (`8k variant'). Each individual carrier can be modulated either by QPSK, 16-QAM, 64-QAM or hierarchical modulation View full abstract»

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  • Digital Video Broadcasting

    Page(s): 2 - 4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (624 KB)  

    First Page of the Article
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  • DVB specifications for broadcast-related interactive TV services

    Page(s): 38 - 42
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (608 KB)  

    Following on from the early success of the Digital Video Broadcasting (DVB) Project, the next step is to enable DVB-compliant receivers to support an attractive range of interactive services. Various types of interactive services are described. The implications for standards are then listed and the specifications summarised. The specifications include a set of network-independent protocols, as well as specifications for the most popular types of networks for the interaction channel. These cover the public switched telephone network (PSTN) and its digital equivalent (ISDN), as well as cable TV networks. The opportunity exists to enhance the consumer experience by adding interactivity to digital broadcasting. DVB is putting in place some of the enablers to make this a reality View full abstract»

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  • DVB channel coding standards for broadcasting compressed video services

    Page(s): 11 - 20
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (980 KB)  

    Video compression has been of interest to broadcasters for many years. Professional applications based on ITU-R standards are already in use in the contribution and distribution chain. The goal of transmitting digitally compressed video to the home was also approached but with reduced success until the development of video compression standards, such as MPEG, which permit the low bit rates needed to support consumer services. Following the agreement on source coding processes the emphasis turned to digital transmission techniques suitable for broadcast media such as satellite, cable, terrestrial and multichannel multipoint distribution systems (MMDS). Whereas in some parts of the world proprietary schemes have emerged, in Europe the Digital Video Broadcasting Project was convened to develop such transmission standards as would be complementary to MPEG. A number of different solutions have been necessary and these are described together with an overview of practical development of systems and hardware View full abstract»

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  • DAVIC: striving to achieve the benefits of openness

    Page(s): 43 - 45
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (516 KB)  

    The convergence of computing, communications and consumer electronics brings enormous opportunity for industrial growth, for efficiency generally in the management of complexity, and for creativity in social and entertainment pursuits. It also beings confusion, uncertainty and ambiguity, which can be debilitating for users and expensive in waste and in the churn of obsolescent products. The Digital Audio-Visual Council (DAVIC) is one of few global and cross-industrial organisations which is succeeding in managing convergence. DAVIC is about to publish the second (backwards compatible) revision to its Specifications, DAVIC 1.2. The Specifications were created to reduce uncertainty, to reduce the costs of technology and to support the interoperability of high-quality, real-time interactive multimedia services around the world View full abstract»

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  • Multimedia services and data broadcasting via satellite

    Page(s): 33 - 37
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (576 KB)  

    Since 1995 EUTELSAT, as well as other service providers (in Europe and worldwide), in collaboration with industrial partners and research institutions have been developing digital platforms for providing multimedia services as well as data broadcasting via satellite services. These digital platforms are based on the same technologies as those used for the emerging digital television and radio services, namely Digital Video Broadcasting (DVB) and MPEG-2. These platforms will greatly improve the speed of multimedia services to the end user (e.g. up to 2 Mbit/s per session on an Internet connection) and will provide the possibility of downloading very large files in a very short time (e.g. downloading speeds of up to 40 Mbit/s per transponder) to a very large number of customers. By using the same technology as for digital television and radio, large economies of scale are foreseen, thus making these digital platforms very affordable on both the unlink side and the receiver side (e.g. less than $300 for the DVB-PC card kit) View full abstract»

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  • A tutorial on the Digital Audio-Visual Council (DAVIC) standardisation activity

    Page(s): 46 - 56
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    International compatibility for the distribution of video and multimedia content through communication networks is something which has thus far not been achieved. New digital systems provide an opportunity for global compatibility between audio and video transmission and full multimedia communications incorporating text, data, audio, still and moving video in an interactive environment. It is with this commercial opportunity in mind that the Digital Audio-Visual Council (DAVIC) has been created and its first standards, DAVIC1.0 and 1.1, have been released. In Europe the European Commission is actively supporting the development of DAVIC through its Advanced Communications Technologies and Services (ACTS) initiative but DAVIC has widespread international support View full abstract»

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  • DVB conditional access

    Page(s): 21 - 27
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    The DVB (Digital Video Broadcasting) Project's development of common elements of conditional-access technology for digital TV is described, including the common scrambling system, Simulcrypt and the common interface. The regulation of conditional-access activity in Europe through an European Directive built on a DVB consensus position is outlined and the initial market development is described View full abstract»

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