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Phonofilm is an optical sound-on-film system developed by inventors Lee de Forest and Theodore Case in the 1920s. ==Introduction== In 1919 and 1920, Lee De Forest, inventor of the audion tube, filed his first patents on a sound-on-film process, DeForest Phonofilm, which recorded sound directly onto film as parallel lines. These parallel lines photographically recorded electrical waveforms from a microphone, which were translated back into sound waves when the movie was projected. Some sources say that DeForest improved on the work of Finnish inventor Eric Tigerstedt — who was granted German patent 309.536 on 28 July 1914 for his sound-on-film work — and on the Tri-Ergon process, patented in 1919 by German inventors Josef Engl, Hans Vogt, and Joseph Massole.〔(Lee de Forest and Phonofilm at Virtual Broadway website )〕 The Phonofilm system, which recorded synchronized sound directly onto film, was used to record vaudeville acts, musical numbers, political speeches, and opera singers. The quality of Phonofilm was poor at first, improved somewhat in later years, but was never able to match the fidelity of sound-on-disc systems such as Vitaphone, or later sound-on-film systems such as RCA Photophone or Fox Movietone. The films of DeForest were short films made primarily as demonstrations to try to interest major studios in Phonofilm. These films are particularly valuable to entertainment historians, as they include recordings of a wide variety of both well-known and less famous American vaudeville and British music hall acts which would otherwise have been forgotten. Some of the films, such as ''Flying Jenny Airplane'', ''Barking Dog'', and a film of DeForest himself explaining the Phonofilm system (all 1922) were experimental films to test the system. Some of the people filmed included vaudevillians Joe Weber and Lew Fields, Eva Puck and Sammy White, Eddie Cantor, Ben Bernie, Oscar Levant, Phil Baker, Roy Smeck, jazz musicians Noble Sissle and Eubie Blake, "all-girl" bandleader Helen Lewis, harmonicist Borrah Minnevitch, Nikita Balieff's company La Chauve-Souris, opera singers Eva Leoni, Abbie Mitchell, and Marie Rappold, Broadway stars Helen Menken and Fannie Ward, folklorist Charles Ross Taggart, copla singer Concha Piquer (first Spanish sound film), and politicians Calvin Coolidge, Robert La Follette, Al Smith, and Franklin D. Roosevelt. Smith and Roosevelt were filmed during the 1924 Democratic National Convention, held June 24 to July 9 at Madison Square Garden in New York City. Coolidge became the first U. S. President to appear in a sound motion picture when DeForest filmed him at the White House on 11 August 1924. In November 1922, De Forest founded the De Forest Phonofilm Corporation with studios at 314 East 48th Street in New York City, and offices at 220 West 42nd Street in the Candler Building. However, DeForest was unable to interest any of the major Hollywood movie studios in his invention.〔(''The Educational Screen'' (January 1944), Chapter 12, "Now They Must Talk" by Arthur Edwin Krows )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Phonofilm」の詳細全文を読む スポンサード リンク
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