Digital television (DTV) is the transmission of television signals using digital encoding, in contrast to the earlier analog television technology which used analog signals. At the time of its development it was considered an innovative advancement and represented the first significant evolution in television technology since color television in the 1950s. Modern digital television is transmitted in high-definition television (HDTV) with greater resolution than analog TV. It typically uses a widescreen aspect ratio in contrast to the narrower format (4:3) of analog TV. It makes more economical use of scarce radio spectrum space; it can transmit up to seven channels in the same bandwidth as a single analog channel, and provides many new features that analog television cannot. A transition from analog to digital broadcasting began around 2000. Different digital television broadcasting standards have been adopted in different parts of the world; below are the more widely used standards:
Digital Video Broadcasting (DVB) is a set of international open standards for digital television. DVB standards are maintained by the DVB Project, an international industry consortium, and are published by a Joint Technical Committee (JTC) of the European Telecommunications Standards Institute (ETSI), European Committee for Electrotechnical Standardization (CENELEC) and European Broadcasting Union (EBU).
Advanced Television Systems Committee (ATSC) standards are an international set of standards for broadcast and digital television transmission over terrestrial, cable and satellite networks. It is largely a replacement for the analog NTSC standard and, like that standard, is used mostly in the United States, Mexico, Canada, South Korea and Trinidad & Tobago. Several former NTSC users, such as Japan, have not used ATSC during their digital television transition, because they adopted other systems such as ISDB developed by Japan, and DVB developed in Europe, for example.
Television was introduced in Finland in 1955. Color television started in 1969 and was introduced gradually, with most programs in color by the late 1970s. All terrestrial analogue stations stopped broadcasting on 1 September 2007 after the introduction of digital television; cable providers were allowed to continue analog broadcasting in their networks until 1 March 2008.
PALplus is an analogue television broadcasting system aimed to improve and enhance the PAL format by allowing 16:9 aspect ratio broadcasts, while remaining compatible with existing television receivers, defined by International Telecommunication Union (ITU) recommendation BT.1197-1. Introduced in 1993, it followed experiences with the HD-MAC and D2-MAC, hybrid analogue-digital widescreen formats that were incompatible with PAL receivers. It was developed at the University of Dortmund in Germany, in cooperation with German terrestrial broadcasters and European and Japanese manufacturers. The system had some adoption across Europe during the late 1990s and helped introduce widescreen TVs in the market, but never became mainstream.
Free-to-air (FTA) services are television (TV) and radio services broadcast in unencrypted form, allowing any person with the appropriate receiving equipment to receive the signal and view or listen to the content without requiring a subscription, other ongoing cost, or one-off fee. In the traditional sense, this is carried on terrestrial radio signals and received with an antenna.
Digital Video Broadcasting - Satellite - Second Generation (DVB-S2) is a digital television broadcast standard that has been designed as a successor for the popular DVB-S system. It was developed in 2003 by the Digital Video Broadcasting Project, an international industry consortium, and ratified by ETSI in March 2005. The standard is based on, and improves upon DVB-S and the electronic news-gathering system, used by mobile units for sending sounds and images from remote locations worldwide back to their home television stations.
1080p is a set of HDTV high-definition video modes characterized by 1,920 pixels displayed across the screen horizontally and 1,080 pixels down the screen vertically; the p stands for progressive scan, i.e. non-interlaced. The term usually assumes a widescreen aspect ratio of 16:9, implying a resolution of 2.1 megapixels. It is often marketed as Full HD or FHD, to contrast 1080p with 720p resolution screens. Although 1080p is sometimes referred to as 2K resolution, other sources differentiate between 1080p and (true) 2K resolution.
Television in Germany began in Berlin on 22 March 1935, broadcasting for 90 minutes three times a week. It was home to the first regular television service in the world, named Fernsehsender Paul Nipkow.
HD Lite is the re-transmission of a particular HDTV channel at reduced picture quality compared to the original source stream.
NTV Plus is the brand name for the Russian digital satellite television service from NTV, transmitted from Eutelsat's W4 satellite at 36.0°E and from Bonum 1 at 56.0°E. Previously a part of Vladimir Gusinsky's media empire, now it is included in the Gazprom Media holding.
There are four major forms of digital television (DTV) broadcast in the United Kingdom: a direct-to-home satellite service from the Astra 28.2°E satellites provided by Sky UK, a cable television service provided by Virgin Media ; a free-to-air satellite service called Freesat; and a free-to-air digital terrestrial service called Freeview. In addition, an IPTV system known as EE TV is provided by EE. Individual access methods vary throughout the country. 77% of the United Kingdom has access to HDTV via terrestrial digital television. Satellite is the only source of HDTV broadcast available for the remaining 23%.
A free-to-air or FTA Receiver is a satellite television receiver designed to receive unencrypted broadcasts. Modern decoders are typically compliant with the MPEG-4/DVB-S2 standard and formerly the MPEG-2/DVB-S standard, while older FTA receivers relied on analog satellite transmissions which have declined rapidly in recent years.
Television in France was introduced in 1931, when the first experimental broadcasts began. Colour television was introduced in October 1967 on La Deuxième Chaîne.
Television in Belgium was introduced in 1953 and began with one channel each in Dutch and French. The country is heavily cabled, with 93% of households watching television through cable as of 2003.
High-definition television (HDTV) describes a television or video system which provides a substantially higher image resolution than the previous generation of technologies. The term has been used since at least 1933; in more recent times, it refers to the generation following standard-definition television (SDTV). It is the standard video format used in most broadcasts: terrestrial broadcast television, cable television, satellite television.
GS Group is the largest Russian developer and producer of set-top boxes for television. Since 1991 company has been conducting systematic research and development work and producing radio electronic equipment. Company products and technology concepts are used in satellite broadcasting projects NTV-PLUS, Tricolor TV, Platform HD etc. Total number of TV subscribers using set-top boxes produced by the Corporation in Russian Federation exceeds 7 million. In 2007 General Satellite became the main investor of the integral innovation project: "Technopolis GS: scientific and technological development territory", which is implemented in Gusev town, Kaliningrad Region. It was a major contractor for NTV-PLUS company in 90s in Russia.
Eutelsat 5 West A, formerly Atlantic Bird 3 was a communications satellite belonging to the operator Eutelsat. Situated at 5° West, it broadcast satellite television, radio and other digital data. Developed for France Telecom it was transferred soon after its launch to the operator Eutelsat. It entered operational service in early September 2002. Its anticipated working life was 15 years. It was decommissioned in January 2023.
