Digital signal (broadcasting)

Digital broadcasting is the practice of using digital signals rather than analogue signals for broadcasting over radio frequency bands. It is widespread as digital television (especially satellite television). Digital audio broadcasting is being adopted more slowly for radio broadcasting where it is mainly used in Satellite radio.

Digital links, thanks to the use of data compression, generally have greater spectral efficiency than analog links. Content providers can provide more services or a higher-quality signal than was previously available.

It is estimated that the share of digital broadcasting increased from 7% of the total amount of broadcast information in 2000, to 25% in 2007. Some countries have completed a Digital television transition.

NB: For more information on the premise of digital broadcasting refer to the 2002 edition of the World Radio TV Handbook.

Digital broadcasting has been helped greatly thanks to the presence of computers. In fact, with the invention of the integrated circuit in the 1960s and the microprocessor in the 1970s, digital broadcasting seems to have taken a footing in the global village that is broadcasting. However, most broadcasters are switching to digital broadcasting mostly because of a lack of frequency space.

Thus, because of these problems, most broadcasters are switching to digital techniques.

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