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In the late 1920s and early 1930s, the Vitaphone sound system used large sixteen-inch 33 + 1 ⁄ 3 rpm records to provide the soundtrack for motion pictures. The record rotated in the usual clockwise direction but the groove was cut and played starting at the inside of the recorded area and proceeding outward.
45 rpm record: Analog often around 4 minutes (EP: 7 minutes) per side, up to 6 per side, in some cases even a few minutes longer. LP record: Analog typically 15–25 minutes per side (30 minutes per side for classical & spoken word), although 45 minutes is possible with tight groove spacing and no spacing between tracks. Audio cassette: Analog
The 45 rpm speed was chosen to allow a 5 + 1 ⁄ 2 minute playing time from the 7-inch disc. [11] The 7-inch 45 rpm record was released March 31, 1949, by RCA Victor as a smaller, more durable and higher-fidelity replacement for the 78 rpm shellac discs. [12] The first 45 rpm records were monaural, with recordings on both sides of the disc. As ...
In the case of large format, 4 x 5 inch films can record approximately 298.7 million pixels, and 1,200 million pixels in the case of 8 x 10 inch film. However, as with a digital system, poor optical quality of lenses will decrease the resolving potential of a film emulsion. [7] [8] [9]
The Blu-ray specification and all currently available players support region coding. As of July 2008 about 66.7% of Blu-ray Disc titles are region-free and 33.3% use region codes. [6] The HD DVD specification had no region coding, so a HD DVD from anywhere in the world will work in any player.
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Vogue records retailed for US$1.05, about fifty percent more than ordinary ten-inch 78 rpm records. The novelty of the colorful discs attracted interest and sales at first, but success proved elusive and Vogue went out of business in 1947 after fewer than 100 catalog items bearing the Vogue logo had been issued. [4]
However, some very early (c. 1928–1931) radio programs were on sets of 12-inch or even 10-inch (25 cm) 78 rpm discs, and some later (circa 1960–1990) syndicated radio programs were distributed on 12-inch 33 + 1 ⁄ 3 rpm microgroove vinyl discs visually indistinguishable from ordinary records except by their label information.