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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.
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 frequency response for a conventional LP player might be 20 Hz to 20 kHz, ±3 dB. The low-frequency response of vinyl records is restricted by rumble noise (described above), as well as the physical and electrical characteristics of the entire pickup arm and transducer assembly. The high-frequency response of vinyl depends on the cartridge.
16 2/3rpm vinyl record: A label close-up on a 16rpm vinyl Mechanical analog; lateral groove, horizontal stylus motion - played at half the regular speed of an LP 1951 Minifon P55 Minifon cassette Analog, magnetic wire on reel, 30 cm/s or about 11.8 ips was quickly adopted by many governments as being the ultimate "spy" recorder of its day 1957
The 10-inch and 12-inch LP record (long play), or 33 + 1 ⁄ 3 rpm microgroove vinyl record, is a gramophone record format introduced by Columbia Records in 1948. [15] A single LP record often had the same or similar number of tunes as a typical album of 78s, and it was adopted by the record industry as a standard format for the "album". [7]
Two different ways of marking cut-out records on LP jackets. When LPs were the primary medium for the commercial distribution of sound recordings, manufacturers would cut the corner, punch a hole, or add a notch to the spine of the jacket of unsold records returned from retailers; these "cut-outs" might then be re-sold to record retailers or other sales outlets for sale at a discounted price.
While some multi-LP releases (particularly those issued during the vinyl record's market dormancy from 1988 to 2007) would either package the discs in a simple sleeve or sandwich the records between two cards and shrink wrap, the prominence of gatefold for multi-LP albums led it to become the most common form of packaging for them.
In the vinyl record manufacturing process, a lacquer master disc is cut and electroforming is used to make negative metal molds from it; certain molds are converted into stampers, can be used to press thousands of vinyl copies of the master. Within the vinyl record industry, lacquers, sometimes called 'acetates' or 'refs', are also used for ...