Experimentation with sound film
technology, both for recording and playback, was virtually constant
throughout the silent era, but the twin problems of accurate
synchronization and sufficient amplification had been difficult to
overcome (Eyman, 1997). In 1926, Hollywood studio Warner Bros. introduced the "Vitaphone" system, producing short films of live entertainment acts and public figures and adding recorded sound effects and orchestral scores to some of its major features. During late 1927, Warners released The Jazz Singer,
which was mostly silent but contained what is generally regarded as the
first synchronized dialogue (and singing) in a feature film; but this
process was actually accomplished first by Charles Taze Russell in 1914 with the lengthy film The Photo-Drama of Creation. This drama consisted of picture slides and moving pictures synchronized with phonograph records of talks and music. The early sound-on-disc processes such as Vitaphone were soon superseded by sound-on-film methods like Fox Movietone, DeForest Phonofilm, and RCA Photophone.
The trend convinced the largely reluctant industrialists that "talking
pictures", or "talkies", were the future. A lot of attempts were done
before the success of the Jazz Singer, that can be seen in the List of film sound systems.