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A laser turntable (or optical turntable) is a phonograph that plays standard LP records (and other gramophone records) using laser beams as the pickup instead of using a stylus as in conventional turntables. Although these turntables use laser pickups, the same as Compact Disc players, the signal remains in the analog realm and is never digitized.
The most common diameter sizes for gramophone records are 12-inch, 10-inch, and 7-inch (300 mm, 250 mm, and 180 mm). [1] Early American shellac records were all 7-inch until 1901, when 10-inch records were introduced. 12-inch records joined them in 1903. [2] By 1910, other sizes were retired and nearly all discs were either 10-inch or 12-inch ...
LP record. The LP (from long playing [1] or long play) is an analog sound storage medium, specifically a phonograph record format characterized by: a speed of 33⁄ 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 dynamic range of a direct-cut vinyl record may surpass 70 dB. Analog studio master tapes can have a dynamic range of up to 77 dB. [5] An LP made out of perfect diamond has an atomic feature size of about 0.5 nanometer, which, with a groove size of 8 micron, yields a theoretical dynamic range of 110 dB.
RIAA equalization is a specification for the recording and playback of phonograph records, established by the Recording Industry Association of America (RIAA). The purposes of the equalization are to permit greater recording times (by decreasing the mean width of each groove), to improve sound quality, and to reduce the groove damage that would ...
A special section of a record store devoted to such items was known as the "cut-out bin" or bargain bin. [1][2] As tapes and CDs supplanted LPs, the mechanisms for indicating a cut-out changed. On cassettes, a hole tended to be punched or burned through the case and through its printed insert. On CDs (a practice that continues today), a section ...
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Laser cutting. Laser cutting is a technology that uses a laser to vaporize materials, resulting in a cut edge. While typically used for industrial manufacturing applications, it is now used by schools, small businesses, architecture, and hobbyists. Laser cutting works by directing the output of a high-power laser most commonly through optics.
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