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Concept
Simulcast
Résumé
Simulcast (a portmanteau of simultaneous broadcast) is the broadcasting of programmes/programs or events across more than one , bitrate or medium, or more than one service on the same medium, at exactly the same time (that is, simultaneously). For example, Absolute Radio is simulcast on both AM and on satellite radio. Likewise, the BBC's Prom concerts were formerly simulcast on both BBC Radio 3 and BBC Television. Another application is the transmission of the original-language soundtrack of movies or TV series over local or Internet radio, with the television broadcast having been dubbed into a local language.
Before launching stereo radio, experiments were conducted by transmitting left and right channels on different radio channels. The earliest record found was a broadcast by the BBC in 1926 of a Halle Orchestra concert from Manchester, using the wavelengths of the regional stations and Daventry.
In its earliest days, the BBC often transmitted the same programme on the "National Service" and the "Regional Network".
An early use of the word "simulcast" is from 1925.
Between 1990 and 1994 the BBC broadcast a channel of entertainment (Radio 5) which offered a wide range of simulcasts, taking programmes from the BBC World Service and Radio 1, 2, 3 and 4 for simultaneous broadcast.
Before stereo TV sound transmission was possible, simulcasting on TV and radio was a method of effectively transmitting "stereo" sound to music TV broadcasts. Typically, an FM frequency in the broadcast area for viewers to tune their stereo systems to would be displayed on the screen. The band Grateful Dead and their concert "Great Canadian Train Ride" in 1970 was the first TV broadcast of a live concert with FM simulcast. In the 1970s WPXI in Pittsburgh broadcast a live Boz Scaggs performance which had the audio simultaneously broadcast on two FM radio stations to create a quadrophonic sound, the first of its kind. The first such transmission in the United Kingdom was on 14 November 1972, when the BBC broadcast a live classical concert from the Royal Albert Hall on both BBC2 and Radio 3.
Source officielle
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