- published: 08 Oct 2013
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The National Broadcasting Company (NBC) is an American commercial broadcasting television network and former radio network headquartered in the GE Building in New York City's Rockefeller Center with additional major offices near Los Angeles and in Chicago. NBC is sometimes referred to as the "Peacock Network," due to its stylized peacock logo, created originally for color broadcasts.
Formed in 1926 by the Radio Corporation of America (RCA), NBC was the first major broadcast network in the United States. In 1986, control of NBC passed to General Electric (GE), with GE's $6.4 billion purchase of RCA. GE had previously owned RCA and NBC until 1930, when it had been forced to sell the company as a result of antitrust charges.
After the 1986 acquisition, the chief executive of NBC was Bob Wright, until he retired, giving his job to Jeff Zucker. The network is currently part of the media company NBCUniversal, which is a joint venture of Comcast and General Electric since 2011 (and before that, jointly owned by GE and current Universal Music Group parent Vivendi). As a result of the merger, Zucker left NBC and was replaced by Comcast executive Steve Burke.
Radio is the transmission of signals through free space by electromagnetic waves with frequencies significantly below visible light, in the radio frequency range, from about 3 kHz to 300 GHz. These waves are called radio waves. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space.
Information, such as sound, is carried by systematically changing (modulating) some property of the radiated waves, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.
The etymology of "radio" or "radiotelegraphy" reveals that it was called "wireless telegraphy," which was shortened to "wireless" in Britain. The prefix radio- in the sense of wireless transmission, was first recorded in the word radioconductor, a description provided by the French physicist Édouard Branly in 1897. It is based on the verb to radiate (in Latin "radius" means "spoke of a wheel, beam of light, ray").
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