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Thermal mapping and road-weather information systems for highway engineers
Published in A.H. Perry, L.J. Symons, Highway Meteorology, 1991
Information from sensors and weather offices has to be combined and distributed to the engineer, other emergency services and the general public if required. Several countries have experimented with some form of teletext service to distribute the information as widely as possible. As yet teletext graphics and communications are slow but no doubt improvements will prove this to be a popular solution. Teletext systems normally allow information to be displayed only, and not manipulated, unless the information is downloaded onto a computer. This has meant the development of dedicated computer systems and networks for road weather, leading to a proliferation of terminals on an engineer's desk, unless existing computer equipment has been
Data Broadcasting — WavePhore
Published in S. Merrill Weiss, Issues in Advanced Television Technology, 1996
The idea of broadcasting data along with normal NTSC transmissions has been around for a long time. Back in the late 1970’s and early 1980’s, a system called teletext was developed. It did not catch on in North America, but it has been in service in Europe ever since. There were three main reasons it didn’t work here: (1) it didn’t produce acceptable data recovery in enough locations, (2) there wasn’t a single standard that could be fully developed by the industry, and (3) the program offering was not one that either the public or advertizers were willing to support financially.
10 The future: brave new world or just more of the same?
Published in Chris Forrester, The Business of Digital Television, 2013
Teletext is the brand name of a UK news/information and advertising television service that uses the analogue vertical blanking interval of a TV picture. Other broadcasters use the technology for similar text services. A matching, and visually improved, system exists in the digital world usually incorporating graphics-rich information, pictures of holiday destinations, houses or cars for sale, clothing for sale, etc.
Accessibility of services in digital television for hearing impaired consumers
Published in Assistive Technology, 2022
Subtitles for the hearing impaired persons consist of the written dialogs, written lyrics, and sound effects on-screen at the same time when the sound is being emitted. Subtitling is important for the people with hearing impairments as a way to supplement the audio signal (Matamala & Orero, 2010). The European standard for digital television offers two types of subtitles: Digital Video Broadcasting (DVB) subtitles and teletext. Some broadcasting operators use both types (for example, the BBC in the UK or CRTVE in Spain), others use one of them (Slater et al., 2010b). The DVB Project (a consortium of more than 300 companies dealing with broadcasting) specified the way how one or more subtitle streams can be monitored and can respond to all video services within the multiplex. This specification is known as DVB subtitling or ETSI (European Telecommunications Standard Institute) 300743 DVB subtitling. It provides two methods of subtitle transmission: “the bitmap” and “code-based.” The DVB subtitling is based on the suitable solutions on both ends of the transmission chain. Both processes, coding and decoding, must comply with the DVB subtitling (Tanton & Weitzel, 1999).