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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 ...
(The first stereo recordings, on disks, had been made in the 1930s, but were never issued commercially.) Stereo (either true, two-microphone stereo or multi mixed) quickly became the norm for commercial classical recordings and radio broadcasts, although many pop music and jazz recordings continued to be issued in monophonic sound until the mid ...
A major breakthrough in practical stereo sound was made by Bell Laboratories, who in 1937 demonstrated a practical system of two-channel stereo, using dual optical sound tracks on film. [28] Major movie studios quickly developed three-track and four-track sound systems, and the first stereo sound recording for a commercial film was made by Judy ...
The history of modern multitrack audio recording using magnetic tape began in 1943 with the invention of stereo tape recording, which divided the recording head into two tracks. In 1948, Chicago's Armour Research Foundation announced that its staffer, physicist Marvin Camras, had produced a three-channel machine with "three parallel magnetic ...
By the beginning of the 1970s systems were starting to be made of plastic and other materials rather than wood. [ 2 ] With the evolution of technology and the emergence of diverse home audio formats, younger audiences shifted from integrated systems and opted for expansive modular units or "component systems" comprising amplifiers, speakers ...
The LP (from long playing [2] or long play) is an analog sound storage medium, specifically a phonograph record format characterized by: a speed of 33 + 1 ⁄ 3 rpm; a 12- or 10-inch (30- or 25-cm) diameter; use of the "microgroove" groove specification; and a vinyl (a copolymer of vinyl chloride acetate) composition disk.
The Encyclopedia of Recorded Sound is a reference work that, among other things, describes the history of sound recordings, from November 1877 when Edison developed the first model of a cylinder phonograph, and earlier, in 1857, when Léon Scott de Martinville invented the phonautograph. [1]
In 1929 a new screen grid tube called UY-224 was introduced, an amplifier designed to operate directly on alternating current. [57] A problem with the early radios was fading stations and fluctuating volume. The invention of the superheterodyne receiver solved this problem, and the first radios with a heterodyne radio receiver went for sale in ...