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1908 poster advertising 's sound films. The, designed for large halls, employed compressed air to amplify the recorded sound. A sound film is a motion picture with sound, or sound technologically coupled to image, as opposed to a. The first known public exhibition of projected sound films took place in Paris in 1900, but decades passed before sound motion pictures were made commercially practical.

Reliable synchronization was difficult to achieve with the early systems, and amplification and recording quality were also inadequate. Innovations in led to the first commercial screening of using the technology, which took place in 1923. The primary steps in the commercialization of sound cinema were taken in the mid- to late 1920s. At first, the sound films which included synchronized dialogue, known as 'talking pictures', or ' talkies', were exclusively shorts.

The earliest movies with recorded sound included only music and effects. The first feature film originally presented as a talkie was, released in October 1927. A major hit, it was made with, 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. By the early 1930s, the talkies were a global phenomenon.

In the United States, they helped secure Hollywood's position as one of the world's most powerful cultural/commercial centers of influence (see ). In Europe (and, to a lesser degree, elsewhere), the new development was treated with suspicion by many filmmakers and critics, who worried that a focus on dialogue would subvert the unique aesthetic virtues of soundless cinema. In, where the popular film tradition integrated silent movie and live vocal performance, talking pictures were slow to take root. Conversely, in India, sound was the transformative element that led to the rapid expansion of.

Poster for ' (1926), the first major motion picture to premiere with a full-length synchronized. Audio recording engineer, the first in Hollywood to hold the job, would supervise sound on, 44 years later. In 1925, of, then a small Hollywood studio with big ambitions, saw a demonstration of the Western Electric sound-on-disc system and was sufficiently impressed to persuade his brothers to agree to experiment with using this system at New York's, which they had recently purchased.

The tests were convincing to the Warner Brothers, if not to the executives of some other picture companies who witnessed them. Consequently, in April 1926 the Western Electric Company entered into a contract with Warner Brothers and W. Rich, a financier, giving them an exclusive license for recording and reproducing sound pictures under the Western Electric system. To exploit this license the Vitaphone Corporation was organized with Samuel L. Warner as its president., as this system was now called, was publicly introduced on August 6, 1926, with the premiere of; the first feature-length movie to employ a synchronized sound system of any type throughout, its contained a musical and added, but no recorded dialogue—in other words, it had been staged and shot as a silent film. Accompanying Don Juan, however, were eight shorts of musical performances, mostly classical, as well as a four-minute filmed introduction by, president of the, all with live-recorded sound.

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These were the first true sound films exhibited by a Hollywood studio. Warner Bros.' , technically similar to Don Juan, followed in October. Craft, at left, demonstrating the projection system. A Vitaphone disc had a running time of about 11 minutes, enough to match that of a 1,000-foot (300 m) reel of 35 mm film.

Fidelity electronic recording and amplification [ ] In 1913,, the manufacturing division of AT&T, acquired the rights to the, the forerunner of the triode. Over the next few years they developed it into a predictable and reliable device that made electronic amplification possible for the first time. Western Electric then branched-out into developing uses for the vacuum tube including public address systems and an electrical recording system for the recording industry. Beginning in 1922, the research branch of Western Electric began working intensively on recording technology for both sound-on-disc and sound-on film synchronised sound systems for motion-pictures. The engineers working on the sound-on-disc system were able to draw on expertise that Western Electric already had in electrical disc recording and were thus able to make faster initial progress.