|
Radio In Paris
Radio transmission in Paris began in 1921, and today there are many Amplitude modulation, AM and Frequency modulation, FM radio stations available to listeners in Paris and the Île-de-France region. History The first radio broadcast in Paris aimed at the general public took place on 22 December 1921. The next year, the French government allowed the establishment of the first private radio station in Paris: Radiola (radio station), Radiola. After the Second World War, Parisian radio was nationalized, and it was not until 1981, following the election of François Mitterrand that private companies were able easily to broadcast in the Paris area. Mitterrand was attempting to permit the growth of radio stations through privatization and fewer regulations, following the Italy, Italian example (in 1977, the Italian government permitted the establishment of private stations, leading to a boom in the number of stations). In the early 1980s, there were more than 200 radio stations in Paris. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amplitude Modulation
Amplitude modulation (AM) is a signal modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the instantaneous amplitude of the wave is varied in proportion to that of the message signal, such as an audio signal. This technique contrasts with angle modulation, in which either the frequency of the carrier wave is varied, as in frequency modulation, or its Phase (waves), phase, as in phase modulation. AM was the earliest modulation method used for transmitting audio in radio broadcasting. It was developed during the first quarter of the 20th century beginning with Roberto Landell de Moura and Reginald Fessenden's radiotelephone experiments in 1900. This original form of AM is sometimes called double-sideband amplitude modulation (DSBAM), because the standard method produces sidebands on either side of the carrier frequency. Single-sideband modulation uses bandpass filters to eliminate one of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
