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FM broadcasting is a method of radio broadcasting that uses frequency modulation (FM) of the radio broadcast carrier wave. Invented in 1933 by American engineer Edwin Armstrong , wide-band FM is used worldwide to transmit high-fidelity sound over broadcast radio . [ 1 ]
With modern equipment, this is widely understood to be unnecessary, and in many countries shorter spacings are used. (See FM broadcast band.) Other spacing restrictions relate to mixing products with nearby television, air-traffic control, and two-way radio systems as well as other FM broadcast stations.
The FM broadcast band is a range of radio frequencies used for FM broadcasting by radio ... the system was developed by the American electrical engineer Edwin Howard ...
These FM systems are unusual, in that they have a ratio of carrier to maximum modulation frequency of less than two; contrast this with FM audio broadcasting, where the ratio is around 10,000. Consider, for example, a 6-MHz carrier modulated at a 3.5-MHz rate; by Bessel analysis, the first sidebands are on 9.5 and 2.5 MHz and the second ...
Radio broadcasting means transmission of audio (sound) to radio receivers belonging to a public audience. Analog audio is the earliest form of radio broadcast. AM broadcasting began around 1920. FM broadcasting was introduced in the late 1930s with improved fidelity. A broadcast radio receiver is called a radio. Most radios can receive both AM ...
With the reform of the broadcasting system in 1950, NHK became an independent company supported by the licence fee paid by listeners, and at the same time the market for commercial broadcasting was liberalised. Thus the first private networks such as Japan Radio Network, National Radio Network, Japan FM Network and Japan FM League were born.
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