Digital Broadcast Symposium 2013
21 DBS Workshops Building a Reliable DVB-T2 Network
– Theory and Experience This workshop, presented by Nevion, discussed issues related to implementation of DVB-T2 networks. It explained the process of spectrum and coverage planning for DVB-T2 implementations and shared experiences from planning to practical implementation. It outlined that it is essential to identify the state of current infrastructure; costs involved in the setup of the new systems and the importance of using qualified suppliers and system providers. Deploying digital is a complicated process and needs the cooperation of all stakeholders involved, from regulators, infrastructure providers, operators, broadcasters to receiver manufacturers. The session also looked at the advanced features of DVB-T2, which provide whole lot flexibility when it comes to implementing services. Features like SFN, use of multiple PLP and rotated constellation provide added robustness to the signal. The workshop looked at the importance of using a T2 Gateway in an SFN deployment which provides easy insertion of regional content, generates the necessary timing information and other useful features. The session was presented by Alan Turner of Kordia, Ray Sanders of Gencom and Espen Myhre of Nevion.
Digital TV Fundamentals:
MPEG, QAM & C-OFDM The workshop by Rohde&Schwarz explained the fundamentals of Digital TV starting with the different stages in the transmission chain and discussing details of MPEG2 transport streams multiplex, compression standards and its effect on picture quality, video data rates, channel coding, modulation methods and FEC subsystems.
This was followed by discussion of the need for Digital TV trials to compare and demonstrate various standards, check coverage area, compare different modes and fine tune parameters to meet the requirements. Sharing some of the experiences on trials in different countries it also highlighted the advantages of SFN, single and multi PLP networks and advantage of digital networks over analogue in terms of interference. The session was presented by Hock Leong Tan of Rohde&Schwarz.
Maximizing FM Coverage – Advances in
Technology and SFN Network Design Richard Redmond of Harris looked at the limitations of FM coverage and advanced SFN networks as a solution. He introduced the MaxxCasting system that combines radio and cellular technology to enable FM broadcasters using boosters to enhance their signals by reducing multipath interference between the main and booster
transmissions through the use of a cluster of boosters. With the use of Sychrocast frequency and modulation are synchronised with the primary transmitter providing clean coverage in prime areas and moving remaining interference to the unpopulated areas and equalizing the delay on STL paths using GPS satellites. Sharing his experience Mr Redmond stated that new advancements in network design and research have provided such benefits and Harris is able to provide a complete and integrated solution with its advanced transmitter designs and planning tools.
Effective Workflow Innovations
– From Acquisition to Archive Nori Noguchi and Noboru Yanagita of Sony made presentations on effective workflows, XDCAM technologies and archive solutions. They explained the XDCAM technology fundamentals, codecs used, cost-effectiveness and other advantages. They also highlighted the long recording time with the help of MPEG2 Long GOP
and the ultra-high reading speed for ingesting. With media available as disc and memory card flexibility is provided for different applications. Looking at the XDCAM workflow and archiving applications, it was stated that XDCAM provides a complete workflow from acquisition to archive. Also presented were some unique ENG features of XDCAM camcorders, use of Wi-Fi remote control, field viewers, professional disc decks and the use of XDCAM station for archiving of tape onto professional XDCAM disc media.
The World of DTT: Developments, Technology
and the Future of Terrestrial Broadcasting The workshop looked at need for digital terrestrial broadcasting highlighting that broadband delivery is really not a substitute for that. It covered, the continuous need for broadcasting and spectrum in the future and the challenges between broadband and broadcast. Aiming to advance and safeguard the development of digital terrestrial television in Europe and around the world and bringing all stakeholders together involved in the implementation of DTT platforms. DigiTAG, it was said, raises awareness about the importance of terrestrial broadcasting for the future. The session also looked at DTT roll-out and migration to T2, comparing the features and benefits of DVB, ATSC, ISDB and DTMB technologies, pointing to the strong growth of terrestrial delivery compare to satellite and cable broadcasting in Europe and worldwide. It is now sensible to “leapfrog” from analogue to DVB-T2 as has been the case with many countries in Asia and Africa. Also highlighted were some case studies and best practices for roll-out of end-to-end services. The workshop also looked at the importance of receiver conformance testing to safeguard consumers and to providing them with receivers that provide all the benefits of the service being offered.
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