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RCA Photophone
This article is for the sound-on-film technology. For the telecommunication device invented by Alexander Graham Bell and Charles Sumner Tainter, see
Photophone
.
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
waveform
of the
audio
signal. The three other major technologies were the
Warner Bros.
Vitaphone
sound-on-disc
system, as well as two "variable-density"
sound-on-film
systems,
Lee De Forest
's
Phonofilm
, and
Fox
-
Case
's
Movietone
.
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