9 Grammatical Pitfalls

optical sound

noun, Movies.
sound recorded on and subsequently played back from an optical or photographic soundtrack, as opposed to a magnetic soundtrack.
Origin of optical sound
1930-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for optical sound
  • At the same time the nitrate optical sound track is rerecorded on magnetic tape and a safety optical negative produced.
British Dictionary definitions for optical sound

optical sound

sound recorded in the form of a photographic image on cinematograph films
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Difficulty index for optical sound

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