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Digital Television
Published in Cliff Wootton, A Practical Guide to Video and Audio Compression, 2005
Digital terrestrial TV (DTT) broadcasting in the United Kingdom uses a DVB-based packaging technique very similar to the satellite service. A transport stream carries the programs and other data in the same way but deploys interactivity with the MHEG standard. The DTT broadcast uses the same spectrum as analog TV but simply uses some of the channels in a more efficient way.
Types of Broadcasting
Published in Skip Pizzi, Graham A. Jones, A Broadcast Engineering Tutorial for Non-Engineers, 2014
Over-the-air digital television, DTV, is also referred to as Digital Terrestrial Television Broadcasting, or DTTB. At this writing, there are four main DTV systems in the world, with significant technical differences: ATSC, DVB-T, ISDB-T, and DTMB.
The Changing Face of Public Broadcasting in India
Published in IETE Journal of Education, 2023
The digital terrestrial TV (DTT), following (DVB T2) standard [10], is broadcast at UHF carriers and can transmit eight channels in the bandwidth earlier allocated to a single analog TV channel. The digital terrestrial television transmission (DTT) uses coded orthogonal frequency division multiplexing (COFDM) and quadrature amplitude modulation (64QAM), to combat issues pertaining to multipath propagation. An STB, designed for DVB- T/T2, is used to decode digital bitstream, and reconstruct video as well as audio signals. Modern digital receivers manufactured to BIS (Bureau of Indian Standards), can directly receive DTT broadcasts, and also have in-built tuner to interface dish antenna of Ku band to be able to receive free to air (FTA) channels. The DTH transmission, however, is more popular and the DTT has not been able to penetrate the market, for the lack of information as well as the availability of TV receivers compatible with the DVB T2 standard. DD is broadcasting, at present, five sub channels in one digital channel, from transmitters located in major cities [11]. Carrier frequencies are within 470–562 MHz, and a simple UHF Yagi antenna, which may even be kept indoors in a high signal strength area, may be used for reception.
Increasing the autonomy of deafblind individuals through direct access to content broadcasted on digital terrestrial television
Published in Assistive Technology, 2020
Angel García-Crespo, Mariuxi Montes-Chunga, Carlos Alberto Matheus-Chacin, Ines Garcia-Encabo
DTT transmits moving images, sound, and associated information in digital form through a network of terrestrial repeaters, with the advantage of having more efficient spectrum use. Thus, the space formerly used for a single analog television signal is now called a digital multiple channel or multiplex and, in general, can now offer four or more digital programs, depending on the compression ratio. At the same time, the remaining spectrum can be used for other services (Benoit, 2008).