Pioneer of the sound film in his country. Schroeder is a Colombian Technician who works in the Master Film A.G. in Europe.
When returning to his native country he is related to the cinematographic industry and innovates the crono-fotófono for the year of 1929, with which the first shorts with sound are filmed. For the year 1931 he perfected his creation with the Cinema Voz Colombia, to adapt to the projectors of the silent cinema and to do dubbing of films.
In 1938, he shot the first full-length film with sound in the city of Colombia.
With the importation of modern and cheaper equipment from the United States, he is displaced and withdraws from the activity, in which he is replaced by his son Guillermo.
The photophone was a device that allowed the transmission of sound by means of an emission of light, invented in 1880 by Alexander Graham Bell in collaboration with Charles Sumner Tainter. The device used light-sensitive cells made with selenium crystal, one of whose properties is that electrical resistance varies inversely with lighting.
The basic objective of the photophone was to modulate a light emission directly to the receiver, manufactured in selenium, which was where a telephone was connected. The modulation was done by a vibrating mirror or by a rotating disk that periodically obscured the light beam.
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