Optical sound is a means of storing sound recordings on transparent film. Originally developed for military purposes, the technology first saw widespread use in the 1920s as a sound-on-film format for motion pictures. Optical sound eventually superseded all other sound film technologies until the advent of digital sound became the standard in cinema projection booths. Optical sound has also been used for multitrack recording and for creating effects in some musical synthesizers. Graphical sound or drawn sound (Fr. son dessiné, Ger. graphische Tonerzeugung,; It. suono disegnato) is a sound recording created from images drawn directly onto film or paper that were then played back using a sound system. There are several different techniques depending on the technology employed, but all are a consequence of the sound-on-film technology and based on the creation of artificial optical polyphonic sound tracks on transparent film.
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