FM radio, with wider audio bandwidth and less susceptibility to signal interference and fading than AM radio.Classical music fans, who were opinion leaders in the audio market, quickly adopted LPs because, unlike with older records, most classical works would fit on a single LP. The advent of the 33⅓ rpm Long Play (LP) microgroove vinyl record, with lower surface noise and quantitatively specified equalization curves as well as noise-reduction and dynamic range systems.Reel-to-reel audio tape recording, based on technology taken from Germany after WWII, helped musical artists such as Bing Crosby make and distribute recordings with better fidelity.īeginning in 1948, several innovations created the conditions that made major improvements of home-audio quality possible: The results proved that listeners preferred high-fidelity reproduction, once the noise and distortion introduced by early sound equipment was removed. Olson conducted an experiment whereby test subjects listened to a live orchestra through a hidden variable acoustic filter. He wanted to make a radio that would sound like he was listening to a live orchestra-that would achieve high fidelity to the original sound. During the 1930s, Avery Fisher, an amateur violinist, began experimenting with audio design and acoustics. RCA Victor began recording performances by several orchestras using optical sound around 1941, resulting in higher-fidelity masters for 78-rpm discs. Some multitrack recordings were made on optical sound film, which led to new advances used primarily by MGM (as early as 1937) and Twentieth Century Fox Film Corporation (as early as 1941). Performances by Leopold Stokowski and the Philadelphia Orchestra were recorded in 19 using telephone lines between the Academy of Music in Philadelphia and the Bell labs in New Jersey. Bell Laboratories began experimenting with a range of recording techniques in the early 1930s.
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