TECHNICAL COMMITTEE MEETING
Workshops Underline New Opportunities in Digital Broadcasting Visual Radio & KBS KONG Service
Deok-Un Jang of KBS shared KBS-Korea’s experience in visual radio and the ‘KBS KONG’ service. The main purpose of Visual Radio was to offer new radio programmes suitable for the era of media convergence and to increase participation by radio audiences. KONG (KBS On-Air No Gravity) was a digital web radio service that KBS created using advanced technology. This Internet service could be easily downloaded and installs a multi-functional web service on a personal computer. With only a single click the user, via the Internet, is able to enjoy crystal-clear sound on all KBS radio channels.
Development of Super High-Vision Cameras and Recording Systems
Mayumi Abe, NHK, highlighted the advanced technical features and parameters of the 8K SHV system compared with the 4K U-HDTV systems. The SHV system has a screen resolution 16 times higher than that of the current HDTV system. The SHV camera uses an 8.9 megapixel CMOS sensor and 60fps progressive scanning. The captured images are stored on a specially developed digital recorder system using the AVC-Intra 100 compression system. The recorder uses 16 parallel flash memory banks with a dual configuration to give a combined storage of 2.1TB which can record up to 139 minutes of SHV footage.
Mobile Multimedia Broadcasting in China
In this presentation Yao Yunghui, RTPRC stated that a joint project with China Mobile to promote the standard, a nationwide commercial network of 300+ sites had been established. Looking at CMMB implementation in China, he mentioned that, until June 2010 320, cities in 22 provinces had launched CMMB services with 108 cities completing in-depth coverage of over 800 million people via 15 million terminals. The current implementation of CMMB service provides radio and TV channels, data broadcasting and interactive services. The system also supports an emergency warning broadcasting system and distribution of disaster information and response method.
The First White Space Trial for 3DTV and Mobile TV
In this presentation Shuji Inaba of TBS-Japan briefly described the present status of terrestrial DTV and Mobile DTV in Japan. “White Space” is described as the radio frequencies previously allocated for broadcast but currently unused due to geographical and other factors. Only permitted operators can get licenses to use Area Full-Seg Channels in “Special White Space Zones”. One of the interesting features of operating in the TV band is that white space devices must query a channel database before transmitting (Cognitive radio), just to make sure they do not accidentally transmit over a frequency currently being used by a TV station or wireless microphone.
DVB-T2 – Flexible Terrestrial Broadcasting System
Gerard Faria, Teamcast/DVB, looked at the new advanced features of the DVB-T2 system compared with the first generation DVB-T system. He cited some of the major improvements in the second generation system, such as the improved bit rate for the same payload, increased coverage area, use of less spectrum and flexibility to configure multiple services in the same channel. He also referred to the use of advanced techniques like Bit Interleaved Coded Modulation (BICM) for improved error correction, higher capacity and the ability to use bit, time and frequency interleaving for more signal diversity and protection. Also the use of Cyclic Prefix OFDM (CP-OFDM) for improved transmission capacity, improved range and guard interval and reduction in overheads.
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