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1920-1940
sound becoming more sophisticated along with the way it is recorded

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1900-1930

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best film? - citizen kane - 1941
sound to be linked with montage
as complicated to the audience
create illusions emotion expressions

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A silent film is a film with no synchronized recorded sound, especially with no spoken dialogue. The silent film era lasted from 1895 to 1927. In silent films for entertainment, the dialogue is transmitted through muted gestures, mime and title cards with a written indication of the plot or key dialogue. The idea of combining motion pictures with recorded sound is nearly as old as film itself, but because of the technical challenges involved, synchronized dialogue was made practical only in the late 1920s with the perfection of the Audion amplifier tube and the introduction of the Vitaphone system. During silent films, a pianist, theatre organist, or, in large cities, even a small orchestra would often play music to accompany the films. Pianists and organists would either play from sheet music or improvise; an orchestra would play from sheet music.

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http://www.bbc.com/culture/story/20170306-how-sound-effects-are-really-made

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Before films talked they still made themselves heard through intertitles and musical accompaniment. And after the introduction of the microphone, there were still questions about how to use the technology.

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http://www.aes.org/aeshc/docs/audio.history.timeline.html

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Though no trace of a working paleophone was ever found, Cros is remembered as the earliest inventor of a sound recording and reproduction machine. The first practical sound recording and reproduction device was the mechanical phonograph cylinder, invented by Thomas Edison in 1877 and patented in 1878.

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This was based on Fritz Pfleumer's 1928 invention of paper tape with oxide powder lacquered to it. The first practical tape recorder from AEG was the Magnetophon K1, demonstrated in Germany in 1935. Eduard Schüller of AEG built the recorders and developed a ring shaped recording and playback head.

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When was sound first used in film?
What did people do before that?
What has changed?

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The first feature film originally presented as a talkie was The Jazz Singer, released in October 1927. A major hit, it was made with Vitaphone, which was at the time the leading brand of sound-on-disc technology. Sound-on-film, however, would soon become the standard for talking pictures.