Synchronous sound refers to sound which is matched to the images and movement within a scene, such as a character opening a door. Toward the end of the 1920s, the definition of a silent feature becomes more problematic. Films were released with synchronised scores of music and effects, and then with talking sequences. ‘The conversion of sound cinema is commonly characterised as a homogenising process that quickly and significantly reduced the cinema’s diversity of film styles and practices’
Two categories of sound diegetic and non-diegetic. Diegetic refers to sound which is heard within the world of the film itself, such as characters dialogue and