Vitaphone was a sound film system used for feature films and nearly 1,000 short subjects made by Warner Bros. and its sister studio First National from 1926 to 1931. Vitaphone was the last major analog sound-on-disc system and the only one which was widely used and commercially successful. The soundtrack was not printed on the film itself, but iss...
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http://en.wikipedia.org/wiki/Vitaphone
(from the article `motion picture, history of the`) By that time, Western Electric, the manufacturing subsidiary of American Telephone & Telegraph Company, had perfected a sophisticated sound-on-disc ... ...the moving-coil type of speaker, and generally improved the entire electronic amplification system. The Warner Bros. movie stud...
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http://www.britannica.com/eb/a-z/v/30
vitaphone An early process of sound film recording in which the sound track is recorded on discs and played in synchronization with the projection of the film; also, sound films made by this method. It is now no longer used.
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http://www.wordinfo.info/words/index/info/view_unit/2313/5
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