TD, Td, or td may refer to:
Terrestrial television or over-the-air television (OTA) is a type of television broadcasting in which the signal transmission occurs via radio waves from the terrestrial (Earth-based) transmitter of a TV station to a TV receiver having an antenna. The term terrestrial is more common in Europe and Latin America, while in Canada and the United States it is called over-the-air or simply broadcast. This type of TV broadcast is distinguished from newer technologies, such as satellite television, in which the signal is transmitted to the receiver from an overhead satellite; cable television, in which the signal is carried to the receiver through a cable; and Internet Protocol television, in which the signal is received over an Internet stream or on a network utilizing the Internet Protocol. Terrestrial television stations broadcast on television channels with frequencies between about 52 and 600 MHz in the VHF and UHF bands. Since radio waves in these bands travel by line of sight, reception is generally limited by the visual horizon to distances of 64–97 kilometres (40–60 mi), although under better conditions and with tropospheric ducting, signals can sometimes be received hundreds of kilometers distant.
DVB-T, short for Digital Video Broadcasting – Terrestrial, is the DVB European-based consortium standard for the broadcast transmission of digital terrestrial television that was first published in 1997 and first broadcast in Singapore in February, 1998. This system transmits compressed digital audio, digital video and other data in an MPEG transport stream, using coded orthogonal frequency-division multiplexing modulation. It is also the format widely used worldwide for Electronic News Gathering for transmission of video and audio from a mobile newsgathering vehicle to a central receive point. It is also used in the US by Amateur television operators.
Digital radio is the use of digital technology to transmit or receive across the radio spectrum. Digital transmission by radio waves includes digital broadcasting, and especially digital audio radio services.
Digital terrestrial television is a technology for terrestrial television in which land-based (terrestrial) television stations broadcast television content by radio waves to televisions in consumers' residences in a digital format. DTTV is a major technological advance over the previous analog television, and has largely replaced analog which had been in common use since the middle of the 20th century. Test broadcasts began in 1998 with the changeover to DTTV beginning in 2006 and is now complete in many countries. The advantages of digital terrestrial television are similar to those obtained by digitising platforms such as cable TV, satellite, and telecommunications: more efficient use of limited radio spectrum bandwidth, provision of more television channels than analog, better quality images, and potentially lower operating costs for broadcasters.
XHAS-TDT is a television station in Tijuana, Baja California, Mexico, affiliated with LATV. It is owned by a Mexican company in which the largest single investor is Entravision Communications, a U.S.-based operator of radio and television stations with radio and television stations in San Diego, including Univision affiliate KBNT-CD, and a similar interest in Milenio Televisión affiliate XHDTV-TDT. The transmitter is on Mount San Antonio in Tijuana.
XEW-TDT is a television station in Mexico City, Mexico. The station is owned by Grupo Televisa and is the flagship station to the Las Estrellas network. XEW is the second-oldest Televisa station and Mexico City's second-oldest station, founded in 1951.
A pirate television station is a broadcast television station that operates without a broadcast license. Like its counterpart pirate radio, the term pirate TV lacks a specific universal interpretation. It implies a form of broadcasting that is unwelcome by the licensing authorities within the territory where its signals are received, especially when the country of transmission is the same as the country of reception. When the area of transmission is not a country, or when it is a country and the transmissions are not illegal, those same broadcast signals may be deemed illegal in the country of reception. Pirate television stations may also be known as "bootleg TV", or confused with licensed low-power broadcasting (LPTV) or amateur television (ATV) services.
CMM TV, originally known as Castilla-La Mancha Televisión (CMT), is the public regional channel of the autonomous region of Castilla–La Mancha (Spain). It belongs to Castilla-La Mancha Media (CMM), the public broadcasting service in the region.
Television in Spain was introduced in 1956, when the national state-owned public service television broadcaster Televisión Española (TVE) started regular analog free-to-air terrestrial black and white broadcasts. Colour transmissions started in 1972 after two years of test transmissions, with all programming transmitted in color in 1977, and colour commercials starting in 1978. TVE held a monopoly on television broadcasting until regional public channels were launched during the 1980s and commercial television started nationwide in 1990. Digital terrestrial television was launched on 30 November 2005 with analog service discontinued on 3 April 2010. Currently, television is one of the leading mass media of the country, and by 2008 was in 99.7% of households in Spain according to INE statistics.
The digital television transition, also called the digital switchover (DSO), the analogue switch/sign-off (ASO), the digital migration, or the analogue shutdown, is the process in which older analogue television broadcasting technology is converted to and replaced by digital television. Conducted by individual nations on different schedules, this primarily involves the conversion of analogue terrestrial television broadcasting infrastructure to digital terrestrial (DTT), a major benefit being extra frequencies on the radio spectrum and lower broadcasting costs, as well as improved viewing qualities for consumers.
SET Televisión is the statewide public television network of the Mexican state of Puebla, with transmitters in Puebla City and Zacatlán. It is part of the Sistema Estatal de Telecomunicaciones, which also provides public radio service in the state. Covering a little over 40% of the state, it offers educational, cultural and alternative programming, much of which is locally generated content intended to address the needs, expectations and lives of Pueblan society.
Digital terrestrial television in Portugal started on 29 April 2009 with currently 7 free-to-air (FTA) channels. In the Azores and Madeira Islands, the respective regional channels are also available. In June 2010 TDT coverage reached 83% of the population and was expected to reach 100% by the end of 2010. The analog switch-off occurred on 26 April 2012. The already four existing analog FTA channels simulcasted in DVB-T, MPEG-4/H.264 (digital), and PAL (analog).
ABNT NBR 15601 is the technical standard published by ABNT, the Brazilian Association of Technical Standards, that is responsible for addressing the aspects regarding transmission on the Brazilian Digital Terrestrial Television Standards, also known as SBTVD or ISDB-T version B.
GOL PLAY is a Spanish sports television network dedicated fully to football and other sports. The channel, created by Mediapro in September 2008, is distributed through cable operators, Internet television, and from August 2009, through digital terrestrial television.
Canal 12 is the state public television network of the Mexican state of Colima. It is operated by the Instituto Colimense de Radio y Televisión (ICRTV) and broadcasts local and national educational and cultural programs.
The Sistema Público de Radiodifusión del Estado Mexicano until 2014, is an independent Mexican government agency. Its mission is to support the development of public broadcasting in the country and expand its coverage. It carries out this goal through ownership of a nationwide network of transmitters and the management of its own public television channel, Canal Catorce. It also owns four radio transmitters.
Canal 44 is the television network of the Universidad de Guadalajara (UDG), a university in Jalisco, Mexico. The primary station, XHCPCT-TDT, broadcasts to the Guadalajara metropolitan area from a transmitter located on Cerro del Cuatro in Tlaquepaque, with additional transmitters in Ciudad Guzmán, Lagos de Moreno, and Puerto Vallarta. Canal 44 and the UDG's eight-station radio network form the Sistema Universitario de Radio y Televisión.
