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Compatible Discrete 4, also known as Quadradisc or CD-4 (not to be confused with compact disc) was a discrete four-channel quadraphonic system for phonograph records. The system was created by JVC and RCA in 1971 [1] and introduced in May 1972. Hundreds of recordings using this technology were released on LP during the 1970s. [2]
Three vinyl records of different formats, from left to right: a 12 inch LP, a 10 inch LP, a 7 inch single. A phonograph record (also known as a gramophone record, especially in British English) or a vinyl record (for later varieties only) is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove.
The Cylinder Audio Archive is a free digital collection maintained by the University of California, Santa Barbara Library with streaming and downloadable versions of over 10,000 phonograph cylinders manufactured between 1893 and the mid-1920s. The Archive began in November 2003 as the successor of the earlier Cylinder Preservation and ...
The Sentinel Chromatron recorded on a single side of uncoated aluminum; its records were read with a fibre needle. It was "rather unstable technology" which produced poor sound quality in comparison to shellac records and was rarely used after 1935. [1] RCA Victor introduced home phonograph disk recorders in October 1930.
J. Lawrence Cook (July 14, 1899 – April 2, 1976) was an American pianist. His output has been estimated at between 10,000 and 20,000 different roll recordings. Cook was born in Athens, Tennessee, the son of a preacher.
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.
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Charles Sumner Tainter (April 25, 1854 – April 20, 1940) was an American scientific instrument maker, engineer and inventor, best known for his collaborations with Alexander Graham Bell, Chichester Bell, Alexander's father-in-law Gardiner Hubbard, and for his significant improvements to Thomas Edison's phonograph, resulting in the Graphophone, one version of which was the first Dictaphone.