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pallophotophone
The pallophotophone, later known as the RCA Photophone sound-on-film system, was an audio recording device developed by General Electric researcher Charles A. Hoxie circa 1922. Hoxie took the name of the device from the Greek words for "shaking light sound".
==History==
The pallophotophone was a optical sound system which could record and replay multiple audio tracks on unsprocketed 35mm Kodak monochrome film using a photoelectric process that captured audio wave forms generated by a vibrating mirror. Hoxie's system is thought to be the world's first effective multitrack recording system, predating magnetic tape multitrack recording by at least 20 years.
In the 1920s and early 1930s, GE experimented with the system by recording many early radio broadcasts from its Schenectady, New York radio station WGY. In the mid-1920s, GE developed a variable-area sound-on-film motion-picture sound system based on Hoxie's work which was subsequently marketed as a commercial product by RCA (then a GE subsidiary) as RCA Photophone. In 1929, RKO Radio Pictures became the first movie studio to use Photophone exclusively. Western Electric would later take over the Photophone trademark.
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