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1920s: Radio was first used to transmit pictures visible as television. 1926: Official Egyptian decree to regulate radio transmission stations and radio receivers. [40] Early 1930s: Single sideband (SSB) and frequency modulation (FM) were invented by amateur radio operators. By 1940, they were established commercial modes.
The first car radio was introduced in 1922, but it was so large that it took up too much space in the car. [70] The first commercial car radio that could easily be installed in most cars went for sale in 1930. [71] [72]
The station was ultimately relicensed as WWJ, and while observing its 25th anniversary in 1945 the News claimed for it the titles of "the world's first station" and where "commercial radio broadcasting began". [85] After the war the American Radio and Research Company (AMRAD) in Medford Hillside, Massachusetts reactivated 1XE. Although there is ...
From then until about 1975, when Dolby Stereo was used for the first time in films, most motion pictures – even some from which stereophonic soundtrack albums were made, such as Zeffirelli's Romeo and Juliet – were still released in monaural sound, [22] stereo being reserved almost exclusively for expensive musicals such as West Side Story ...
First movie encoder make it possible not to send the TV live, but to rely on recordings. 1938 The improved AEG tape-recorder "Magnetophon K4" is first used in radio studios. The belt speed is 77 cm / s, which at 1000 m length of tape has a playing time of 22 minutes.
Released in 1901, the British film Attack on a China Mission was one of the first films to show a continuity of action across multiple scenes. [33] The use of the intertitle to explain actions and dialogue on screen began in the early 1900s. Filmed intertitles were first used in Robert W. Paul's film, Scrooge, or Marley's Ghost. [54]
Milestones in radio: the first half century (1895–1945). The UNESCO courier (February 1997), p. 16–21; Radio Review/Radio Listeners Guide (1925–1929), Broadcasting Yearbook (1935–2010), World Radio TV Handbook (1947–) Berg, Jerome S. The early shortwave stations: a broadcasting history through 1945 (2013) radioheritage.net
In 1978 his 47-year career in radio was hailed as the longest in world history. [68] Naomi ("Joan") Melwit and Norman Banks at the 3KZ microphone, in the late 1930s. The transistor radio first appeared on the market in 1954. In particular, it made portable radios even more transportable.