There are many types of electronic amplifiers, commonly used in radio and television transmitters and receivers, high-fidelity (" hi-fi ") stereo equipment, microcomputers and other electronic digital equipment, and guitar and other instrument amplifiers.

country code-267 ; international calls are made via satellite, using international direct dialing ; 2 international exchanges ; digital microwave radio relay links to Namibia, Zambia, Zimbabwe, and South Africa ; satellite earth station-1 Intelsat ( Indian Ocean ) ( 2007 )

* Domestic: a fairly modern digital cable trunk line now connects switching centers in most of the regions ; the others are connected by digital microwave radio relay

Bluetooth technology provides a way to exchange information between wireless devices such as personal digital assistants ( PDAs ), mobile phones, laptops, computers, printers and digital cameras via a secure, low-cost, globally available short-range radio frequency band.

Bandwidth in hertz is a central concept in many fields, including electronics, information theory, digital communications, radio communications, signal processing, and spectroscopy.

86 % of exchanges now digital ; existing copper subscriber systems now being improved with Asymmetric Digital Subscriber Line ( ADSL ) equipment to accommodate Internet and other digital signals ; trunk systems include fibre-optic cable and microwave radio relay

The first electronic programmable digital computer, the ENIAC, using thousands of octal-base radio vacuum tubes, could perform simple calculations involving 20 numbers of ten decimal digits which were held in the vacuum tube accumulators.

Cable television is a system of distributing television programs to subscribers via radio frequency ( RF ) signals transmitted through coaxial cables or digital light pulses through hybrid fibre coaxial ( HFC ) networks.

In addition to the direct applications ( mp3 players or computers ), digitally compressed audio streams are used in most video DVDs ; digital television ; streaming media on the internet ; satellite and cable radio ; and increasingly in terrestrial radio broadcasts.

Many countries are replacing broadcast analog television with digital television to allow other uses of the television radio spectrum.

A broadcaster may opt to use a standard-definition ( SDTV ) digital signal instead of an HDTV signal, because current convention allows the bandwidth of a DTV channel ( or " multiplex ") to be subdivided into multiple digital subchannels, ( similar to what most FM radio stations offer with HD Radio ), providing multiple feeds of entirely different television programming on the same channel.

Radio DJs or radio personalities introduce and play music that is broadcast on AM, FM, shortwave, digital, or internet radio stations.

Other technology methods used in the delivery of distance education include interactive radio instruction ( IRI ), interactive audio instruction ( IAI ), online three-dimensional ( 3D ) virtual worlds, immersive environments, digital games, webinars, web casts etc.

DAB digital radio is broadcast over two local multiplexes.

There are many types of electronic amplifiers, commonly used in radio and television transmitters and receivers, high-fidelity (" hi-fi ") stereo equipment, microcomputers and other electronic digital equipment, and guitar and other instrument amplifiers.

His work, as important as it was in its own right, was a part of a continuum of progress in communications and electronics that since his time has brought forward color television, the personal computer, the Internet, cable and satellite radio and TV, personal mobile phones, audio, video and computing, digital stereo radio on both the medium wave and VHF-FM bands, and digital high definition television on VHF, UHF, cable and satellite.

All stations commenced digital broadcasting during 2003, and in December 2003, a fifth station, TDT, began broadcasting.

The islands were wired with 13 outgoing and 10 incoming commercial telephone lines, a 60-channel submarine cable, 22 DSN circuits by satellite, an Autodin with standard remote terminal, a digital telephone switch, the Military Affiliated Radio System ( MARS station ), a UHF / VHF air-ground radio, and a link to the Pacific Consolidated Telecommunications Network ( PCTN ) satellite.

* KSL-TV, a television station ( digital UHF 38, virtual 5 ) licensed to serve Salt Lake City, Utah

They are regularly repeated on the digital speech station BBC Radio 4 Extra and are available on audio CD.

The requirement for Amateur Radio operators in the United States to identify their station callsign at the beginning and the end of each digital transmission and at ten minute intervals using International Morse Code was finally lifted by the FCC on June 15, 1983.

In 2009, British digital radio station BBC Radio 7 broadcast Planet B, a science-fiction drama set in a virtual world.

* Core ( radio station ), a defunct digital radio station in the United Kingdom

The CHU shortwave radio station in Ottawa, Canada broadcasts an exclusive digital time signal encoded using AFSK modulation.

In some cases, including both of these markets, these stations also have digital signals on the digital subchannel of a sister television station in the same market.

The network has no digital on-screen graphic logo in the bottom right-hand corner of the screen on the HD feed, except for a ten-second promotional sweep of a Fox HD acknowledgement ( which before the end of 2010, also featured a sponsor tag for DirecTV ); instead a trigger in Fox's program delivery system at each station displays the affiliate station's logo bug in the 16: 9 right-hand corner of the screen, which disappears during commercial breaks ( during local pre-emptions of Fox programming the logo does remain on display even though the station is not airing the programming ).

In 2008, Fish presented a Friday evening radio show " Fish on Friday " for digital radio station Planet Rock.

In many electrical substation SCADA applications, " distributed RTUs " use information processors or station computers to communicate with digital protective relays, PACs, and other devices for I / O, and communicate with the SCADA master in lieu of a traditional RTU.

There is no comparable British commercial network as Channel 4 abandoned plans to launch its own speech-based digital radio station in October 2008 as part of a £ 100m cost cutting review.

Principal trunk system is coaxial cable ; fiber-optic distribution in Havana and on Isla de la Juventud ; two microwave radio relay installations ( one is old, US-built ; the other newer, Soviet-built ); both analog and digital mobile cellular service established ; one international satellite earth station, Intersputnik ( Atlantic Ocean region ).

New systems incorporated into the station included the Salyut 5B digital flight control computer and gyrodyne flywheels ( taken from Almaz ), Kurs automatic rendezvous system, Luch satellite communications system, Elektron oxygen generators, and Vozdukh carbon dioxide scrubbers.

The audio play was also broadcast on digital radio station BBC 7, on 10 December 2005 ( as a 2-hour omnibus ), and was repeated in six parts as the opening story to the Eighth Doctor's summer season which began on 16 July 2006.

The series was repeated on the digital radio station BBC 7 in early 2007.

The station broadcasts a high-definition digital signal on UHF channel 27 ( virtual channel 4. 1 via PSIP ) from a transmitter near Bosque Estatal de Carite.

WMTY, an evangelical ministry and Public-access television cable TV station, originated in Jasper, Alabama, but began broadcasting in Hamilton in 1995 on TV antenna digital channel 46, and is owned and operated by William E. " Pete " Nichols.

** This station also has a permit to flash-cut to digital on channel 20.

WQWQ is a low-power station whose analog signal was never available over the air in Dahlgren ; however, it is available as ATSC digital channel 12. 2.

One television station, WCBI-TV, the CBS affiliate, is located in the city's historic downtown area ; it broadcasts CW and MyNetworkTV programming on digital subchannels.

BBC Red Button is a branding used for digital interactive television services provided by the BBC, and broadcast in the United Kingdom.

BBC Text originally launched on digital terrestrial services in 1999, and was later introduced on satellite and cable platforms.

A digital text service had been available since the launch of digital terrestrial television in November 1998, but the BBC Text service was not publicly launched until November 1999, due to a lack of availability of compatible set-top boxes.

Although the experimental service was publicly available, there were no digital set-top boxes or receivers available on the market which could decode the signal and the service was only presented to the public via BBC demonstrations using prototype receivers.

From 2008, the BBC gradually began to drop the BBCi name from its digital interactive TV services also, replacing it with the name BBC Red Button.

In November 2008, the BBC celebrated 10 years of the digital interactive TV service.

BBC Red Button is broadcast on all digital television platforms in the UK, including digital cable ( DVB-C ), IPTV ( TalkTalk TV – channel 503, no red button or teletext ), digital satellite ( DVB-S ) ( Sky & Freesat ) and digital terrestrial television ( DVB-T ) ( Freeview ).

The channel launched as BBC News 24 on 9 November 1997 at 17: 30 as part of the BBC's foray into digital domestic television channels, becoming the first competitor to Sky News, which had been running since 1989.

Since then, with several relaunches, an increase in funding and resources from the BBC and improvements in digital television technology, the channel has been able to diversify content, with two minute looped bulletins available to view via BBC Red Button, BBC News Online and the BBC's mobile website, alongside individual weather and sport bulletins.

To this day, it and BBC Parliament remain the only BBC " digital " channels which are made available to analogue cable subscribers.

* Fox News: Until 2004, the CRTC's apparent reluctance to grant a digital licence to Fox News under the same policy which made it difficult for RAI to enter the country-same-genre competition from foreign services-had angered many conservative Canadians, who believed the network was deliberately being kept out due to its perceived conservative bias, particularly given the long-standing availability of services such as CNN and BBC World in Canada.

Since the introduction of digital television, the BBC, ITV, Channel 4 and Channel 5 each introduced a number of digital-only channels.

The BBC World Service is the world's largest international broadcaster, broadcasting news, speech and discussions in 27 languages to many parts of the world on analogue and digital shortwave platforms, internet streaming, podcasting, satellite, FM and MW relays.

The BBC has also begun using their digital channels BBC Three and BBC Four to build a following for off-beat series like The Thick of It.