![]() These motors were called selsyn (self synchronous) motors. The motors did not have to be close together, and, with appropriate circuitry, did not have to be of the same size or power. The solution was to use a special form of motor which has multiple "windings" in it, and which can be connected to another identical motor in such a way that turning one motor a certain distance will turn the other motor exactly the same distance. When sound recording reached the point where the sound was recorded on a synchronized but separate piece of media (such as 35mm film, audio tape, or other media), a method of keeping the recording media and camera film "in sync" was needed. There are many theories regarding the source of the abbreviation "MOS". In post-production, a MOS take may be combined with miscellaneous sounds recorded on location, the musical soundtrack, voice-overs, or sound effects created by a foley artist. Omitting sound recording from a particular shot can save time and relieve the film crew of certain requirements, such as remaining silent during a take, and thus MOS takes are common on contemporary film shoots, mostly when the subjects of the take are not speaking or otherwise generating useful sound. MOS is a standard filmmaking jargon acronym used in production reports to indicate an associated film segment has no synchronous audio track. JSTOR ( July 2009) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. ![]() Please help improve this article by adding citations to reliable sources. ![]() This article needs additional citations for verification. ![]()
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