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RCA Photophone was the trade name given to one of four major competing technologies that emerged in the American film industry in the late 1920s for synchronizing electrically recorded audio to a motion picture image. RCA Photophone was an optical sound, "variable-area" film exposure system, in which the modulated area (width) corresponded to ...
The Pallophotophone utilized the entire width of unsprocketed 35-mm Kodak monochrome film to record and replay multiple audio tracks. Unlike Phonofilm, this optical sound technology used a photoelectric process that captured audio waveforms generated by a vibrating mirror galvanometer, and was the first effective multitrack recording system ...
Cinema Digital Sound, an optical format which was the first commercial digital sound format, used between 1990 and 1992; Fantasound. This was a system developed by RCA and Disney Studios with a multi-channel soundtrack recorded on a separate strip of film from the picture. It was used for the initial release of Walt Disney's Fantasia (1940)
The Movietone sound system is an optical sound-on-film method of recording sound for motion pictures, ensuring synchronization between sound and picture. It achieves this by recording the sound as a variable-density optical track on the same strip of film that records the pictures.
S/PDIF is an audio-only format carried over electrical coaxial cable (with RCA jacks) or optical fibre . Note that there are no differences in the signals transmitted over optical or coaxial S/PDIF connectors—both carry exactly the same information. Selection of one over the other rests mainly on the availability of appropriate connectors on ...
Some multitrack recordings were made on optical sound film, which led to new advances used primarily by MGM (as early as 1937) and Twentieth Century Fox Film Corporation (as early as 1941). RCA Victor began recording performances by several orchestras using optical sound around 1941, resulting in higher-fidelity masters for 78-rpm discs.
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