Digital Broadcast Symposium 2013
11 Developing System Standards – New and Enhancements
The session looked at the various system standards and highlighted recent enhancements and developments taking place in the industry. UHDTV already made an impact during the Olympics with its large cinematic screens and much higher resolution of 4K & 8K compared to the 1080 lines of HDTV. However, the bitrate required for transmission is high and MPEG 4/H.264 is not efficient enough for the purpose. It was suggested that the answer could possibly found in the new High Efficiency Video Coding (HEVC) standard, which provides a compression efficiency 50% better than H.264. Technical work on better satellite transmission standards DVB-S2 evolution or DVB-S3 is already underway. As for terrestrial transmission, NHK has developed ISDB-Tn, comprising an FEC subsystem with BCH/LDPC codes, Ultra Multilevel OFDM up to 64K FFT, carrier modulation of 4096 QAM and MIMO with a single dual polarised antenna.
An effort to consolidate global TV standards has been made by the Future of Broadcast TV or FOBTV, which was established in 2011. The goals of FOBTV include having a single standard for UHDTV, an opportunity that should not to be missed considering that present HDTV standards do not conform to a single uniform transmission standard.
the-top content (OTT) means on-line delivery of video and audio via the Internet without the ISP/Telco being involved in the control or distribution of the content itself. Contrary to popular myth, Internet piracy can be controlled by putting in place measures that combat copyright infringements and other violations of intellectual property laws. Among these anti-piracy measures are legislation, enforcement, Conditional Access (CA) and Digital Rights Management (DRM). The session was summed up with a presentation on the role of broadcast management systems in enabling efficient content delivery to multiple devices, highlighting the increased operational efficiency, improved revenue management and opportunities provided by such a system.
The session was chaired by Philip Laven of DVB and the panellists were Kanako Takeguchi of NHK, Lieven Vermaele of EBU, Shin Tonooka of MMBI-Japan, Nonie Llanes of Conax and Stephen Kyefulumya of Pilat Media.
New Enhancements in Content Delivery – Towards Higher Capacity
The first presentation looked at the high-capacity, decentralised, purpose-built media transport network implemented by Kordia in New Zealand. A combination of Fibre, digital microwave and satellite links the network provides uncompressed HD and SD video, with multicast capability, transport of Ethernet services and other formats at very high quality. The network provides flexible distribution of signals throughout New Zealand with complete control, monitoring and management capability. Looking at higher
An update from China advised that the Digital Terrestrial Multimedia Broadcast, or DTMB, has been enhanced with 256 APSK and 32k FFT to support higher transmission bitrates. This second generation DTMB is compatible with existing DTMB receivers.
The session was chaired by Lieven Vermaile of EBU and the panellists were John Femin of ATEME, Philip Laven of EBU, Masayuki Takada of NHK STRL, Matthias Stoll of DRM, Lindsay Cornell of BBC, Toni Fielder of Fraunhofer IIS and Dr Li LeiLie of SARFT-China.
capacity UHDTV delivery over satellite it was stated that UHDTV requires 120Mbps delivery via satellite. While the 12GHz band requires a high efficiency modulation method or a wideband transponder, the 21 GHz band is wideband but suffers from rain attenuation, especially in this region. Also presented were results and parameters from a few recent trials.
Looking at new technologies in satellite broadcasting, the session highlighted current challenges, such as limited power and bandwidth of satellites, in-orbit satellites getting closer giving rise to more interference issues which are also a major hurdle in using smaller antennae as well as the need for higher capacity for applications like 3DTV and UHDTV. The results of trials were shared, with newer modulation schemes like 64APSK which can provide up to 209MBps capacity. The presentation on Audio for HDTV looked at the importance of audio especially in high quality HD video, which in many instances is not given due attention. A few case studies were shared and lessons learnt from them.
On the DVB scene, DVB-T2 can be used for UHDTV transmissions and trials are planned or underway in Korea, USA and Spain. DVB-T2 Lite has been developed to allow simpler receiver implementations for lower capacity applications such as mobile broadcasting. This has a
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