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transmission of sound or images to a large number of receivers by radio or television. In the United States the first regularly scheduled radio broadcasts began in 1920 at 8XK (later KDKA) in Pittsburgh. The sale of advertisingadvertising,
in general, any openly sponsored offering of goods, services, or ideas through any medium of public communication. At its inception advertising was merely an announcement; for example, entrepreneurs in ancient Egypt used criers to announce ship and cargo arrivals.
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 was started in 1922, establishing commercial broadcasting as an industry. Radio became increasingly attractive as an advertising medium with the coming of network operation. A coast-to-coast hookup was tentatively effected early in 1924, and expansion of both audience and transmission facilities continued rapidly. By 1927 there were two major networks, and the number of stations had so increased that interference became a serious problem. Legislation (see Federal Communications CommissionFederal Communications Commission
(FCC), independent executive agency of the U.S. government established in 1934 to regulate interstate and foreign communications in the public interest.
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) designed to meet this problem was enacted, and the government has since maintained some control over the technical and business activities of the industry. By 2003, 4,804 commercial radio stations were operating in the original AM (amplitude modulation) broadcast band. Commercial broadcasting on the FM (frequency modulation) band began in 1941. The number of FM stations passed the number of AM in 1983; in 1998 there were 6,179 commercial FM stations on the air, and 2,400 noncommercial stations.

Experiments in broadcasting television began in the 1920s but were interrupted by World War II. In 1996 there were 1,340 commercial television stations on the air, and 600 noncommercial stations. There were also more than 2,000 low-power television stations. The Corporation for Public Broadcasting was established in 1968 as a not-for-profit, nongovernmental agency to finance the growth of noncommercial radio and television; by 2003 the network served more than 200 television and nearly 800 radio stations.

New and competing technologies have had a tremendous impact on broadcasting and the ways in which people use it. With the availability of small, high-quality portable and automotive receivers, it has been estimated that less than half of all radio listening takes place in the home. Cable televisioncable television,
the transmission of televised images to viewers by means of coaxial cables. Cable systems receive the television signal, which is sent out over cables to individual subscribers, by a common antenna (CATV) or satellite dish.
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, which reached more than 67% of all U.S. homes by 2003, gave consumers a wider choice of programs from which to choose. The new cable channels, most of them highly specialized in the programming they offer, coupled with the wide availability of videocassettes and then DVDs, reduced the influence of the broadcast networks. Television and radio signals are also now transmitted from satellites direct to household satellite dishes, and television and radio programs as well as motion pictures, music, and the like may now be transmitted or downloaded over the Internet and viewed or heard using a computer, smart phone, or another electronics device with the appropriate software.

See radioradio,
transmission or reception of electromagnetic radiation in the radio frequency range. The term is commonly applied also to the equipment used, especially to the radio receiver.
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; televisiontelevision,
transmission and reception of still or moving images by means of electrical signals, especially by means of electromagnetic radiation using the techniques of radio and by fiberoptic and coaxial cables.
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See E. Barnouw, A History of Broadcasting in the United States (3 vol., 1966–70); J. R. Bittner, Broadcasting and Telecommunication: An Introduction (1985); S. J. Douglas, Inventing American Broadcasting, 1899–1922 (1997); J. R. Walker and D. A. Ferguson, The Broadcast Television Industry (1998).

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Mindspeed's 3G/HD/SD broadcast video family includes the M21250 quad video reclocker, M21424 dual output cable equalizer and M21428 dual output cable driver featuring the industry's lowest total power and footprint solution for the SDI broadcast video application.
The new low-power, dual output cable driver offers broadcast video equipment customers greater flexibility in designing applications such as routing switchers, distribution amplifiers, video tape recorders, post production equipment and cameras as well as other broadcast video applications.
It offers broadcast video equipment customers greater choice and flexibility in designing systems such as routing switchers, distribution amplifiers, and large production switchers as well as other broadcast video equipment.
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Due to its Dual Link 4:4:4 video quality and unique Blackmagic-designed 14 bit analog video outputs, DeckLink HD Pro PCIe is the highest quality broadcast video card available, perfect for the most demanding high-end television and feature film post production.