NHK has been working toward HDTV live production of marathon races. At present we do not have enough equipment for HDTV mobile transmission, so the first step is HDTV production using current SDTV technologies. We have been conducting HDTV live production of marathon races in this way since NHK started digital broadcasting via broadcast satellite in December 2000. However, our goal is to achieve complete HDTV production of the marathon race using HDTV mobile transmission system. For this purpose we have just developed an HDTV UHF digital link using QAM-OFDM modulation scheme. We have conducted many HDTV mobile transmission tests and obtained good results. And we made complete HDTV live production of marathon races in 2002.
BS Japan operates the new Emergency Information Broadcast System for the Digital HDTV Broadcasting via the satellite since 12/1/2000. One of the remarkable point of this system is to be able to compose an urgent announcement as a superimposed data on TV screen not only on the TV channel but also on the Data and Radio channel at the same time.
B.S.Japan installed the Data Broadcasting Verification System for the interactive data television. This system works the same way as that the actual broadcasting operates. Therefore, this system can be use to preview or provide the conducted to improve the technical studies for the interactive data television to work smoothly.
HDTV signals have large information. A higher efficient HDTV coding technique is desired to enrich services of digital broadcasting. In the MPEG-2 video standard, overheads, such as motion vectors, prediction types and several control signals, are transmitted, and its ratio becomes larger at lower bitrates. Picture quality degradation is sometimes caused by this reason. In order to improve the picture quality by means to reduce the overheads, frame and field adaptive picture structures are proposed and motion vectors and prediction types are estimated based on the minimum amount of transmitted bits in each macro-block. This paper presents those compression techniques and the effects.
The "iBrowser" technology is the key to swift and smooth browsing of satellite images and other jumbo visuals on normal personal computers. The "News Reporting System" (NRS) of this technology developed by FujiTelevision Network, Inc. for television program application has been in use since April 2001 to introduce newspaper articles on the live news show "Mezamashi TV" ("Wake up TV"). Powered by the combination of the "iBrowser" and large-size touch screen, NRS1 is major evolution from the conventional approach of shooting actual objects with TV camera. The System enables interactive operation by newscasters themselves, and continues to earn high marks from program producers and directors as a versatile new means of expression.