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Half-speed Mastered
Half-speed mastering is a technique occasionally used when cutting the acetate lacquers from which phonograph records are produced. The cutting machine platter is run at half of the usual speed (16 rpm for 33 rpm records) while the signal to be recorded is fed to the cutting head at half of its regular playback speed. The reasons for using this technique vary, but it is generally used for improving the high-frequency response of the finished record. By halving the speed during cutting, very high frequencies that are difficult to cut become much easier to cut since they are now mid-range frequencies. Mobile Fidelity Sound Lab Mobile Fidelity Sound Lab (MFSL or MoFi) is a record label that specialized in the production of audiophile issues. The company produces reissued vinyl LP records, compact discs, and Super Audio CDs and other formats. History Recording engine ... used half-speed mastering for its Original Master Recording LP's. References Audio storage {{So ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phonograph Records
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 groove usually starts near the outside edge and ends near the center of the disc. The stored sound information is made audible by playing the record on a phonograph (or "gramophone", "turntable", or "record player"). Records have been produced in different formats with playing times ranging from a few minutes to around 30 minutes per side. For about half a century, the discs were commonly made from shellac and these records typically ran at a rotational speed of 78 rpm, giving it the nickname "78s" ("seventy-eights"). After the 1940s, "vinyl" records made from polyvinyl chloride (PVC) became standard replacing the old 78s and remain so to this day; they have since been produced in various sizes and speeds, most commonly 7-inch discs playe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Production Of Phonograph Records
In the production of phonograph records – discs that were commonly made of shellac, and later, vinyl – sound was recorded directly onto a master disc (also called the matrix, sometimes just the master) at the recording studio. From about 1950 on (earlier for some large record companies, later for some small ones) it became usual to have the performance first recorded on audio tape, which could then be processed and/or edited, and then dubbed on to the master disc. Background The grooves are engraved into the master disc on a mastering lathe. Early versions of these master discs were soft wax, and later a harder lacquer was used. The mastering process was originally something of an art as the operator had to manually allow for the changes in sound which affected how wide the space for the groove needed to be on each rotation. Sometimes the engineer would sign his work, or leave humorous or cryptic comments in the lead-out groove area, where it was normal to scratch or sta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Revolutions Per Minute
Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min−1) is a unit of rotational speed (or rotational frequency) for rotating machines. One revolution per minute is equivalent to hertz. Standards ISO 80000-3:2019 defines a physical quantity called ''rotation'' (or ''number of revolutions''), dimensionless, whose instantaneous rate of change is called ''rotational frequency'' (or ''rate of rotation''), with units of reciprocal seconds (s−1). A related but distinct quantity for describing rotation is ''angular frequency'' (or ''angular speed'', the magnitude of angular velocity), for which the SI unit is the radian per second (rad/s). Although they have the same dimensions (reciprocal time) and base unit (s−1), the hertz (Hz) and radians per second (rad/s) are special names used to express two different but proportional ISQ quantities: frequency and angular frequency, respectively. The conversions between a frequency and an angular frequency ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LP Record
The LP (from long playing or long play) is an Analog recording, analog sound storage medium, specifically a phonograph record format characterized by: a speed of revolutions per minute, 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. Introduced by Columbia Records in 1948, it was soon adopted as a new standard by the entire US record industry and, apart from a few relatively minor refinements and the important later addition of stereophonic sound in 1957, it remained the standard format for record albums during a period in popular music known as the album era. LP was originally a trademark of Columbia and competed against the smaller 7-inch sized Single (music), "45" or "single" format by RCA Victor, eventually ending up on top. Today in the vinyl revival era, a large majority of records are based on the LP format and hence the LP name continues to be in use ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mobile Fidelity Sound Lab
Mobile Fidelity Sound Lab (MFSL or MoFi) is a record label that specialized in the production of audiophile issues. The company produces reissued vinyl LP records, compact discs, and Super Audio CDs and other formats. History Recording engineer Brad Miller (1939–1998) released the first recordings on the Mobile Fidelity label in March 1958, a recording of a Southern Pacific steam locomotive. Later LPs included other steam trains, environmental sounds and orchestral music, and a few pop and orchestral recordings. In 1977 Mobile Fidelity Sound Labs was founded and began releasing Original Master Recording LPs, using a half-speed mastering process. From 1985-1992, MoFi sourced recordings from the Soviet Union’s Melodiya Records archives. In November 1999, Mobile Fidelity Sound Lab shut down after the bankruptcy of M. S. Distributing. In 2001 MFSL's assets were acquired by Jim Davis of Music Direct. Products LPs In 1977, Mobile Fidelity began to produce a line of recor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
