The core of the digital terrestrial broadcasting, as well as satellite digital which started in December, 2000, is Hi-Vision. An HDTV image has five times more visual information than a conventional television picture, and 1,125 scanning lines in HDTV system give pictures their detailed realism. Also, a wide-screen format with a 16:9 aspect ratio provides a powerful viewing experience. HDTV also provides CD-quality sound and 5.1 surround sound broadcasting, which is capable of reproducing sounds with a realistic feeling of depth that gives listeners a heightened sense of involvement by using six-channel speaker system. NHK has delivered spectacular images from the Space Shuttle, the depth of the ocean, and the Antarctica. Almost 90% of NHK’s main channel (Digital General TV) is broadcast in HDTV.
Data broadcasting
Data broadcasting gives viewers access to information whenever they need it by simply pressing a remote control button. Viewers can request and withdraw detailed information in such emergency situations as earthquakes and severe storms, as well as program related data, local weather forecasts, and sports results. This function will enhance detailed information services.
Interactive services
Interactive functions allow viewers to actively participate in TV programs from their living room. One can join a quiz show as a competitor and join a contest as a juror by submitting the answers and opinions through the television screen. NHK’s most popular music program, “Red & White Year-end Song Festival” (to be aired on 31 December) will invite audience to screen the songs as the jurors.
Multi-channel services
Digital broadcasting has the bandwidth capacity to broadcast up to three different standard-definition programs on one single channel. For example, it is possible to air a children’s animation program, a language learning program, and a cooking program all at the same time on NHK Educational TV channel.
Download pdf Digital Terrestrial Broadcasting in HDTV
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