Answer :
Any voice, musical passage, or sound effect presented as originating from a source within the film's world is referred to as diegetic sound in film.
Diegetic sound is sound that originates within the world of a video or film. It can come from on-screen or off-screen, but it always occurs at the same time as the action. Any sound that the character or characters on screen can hear is referred to as diegetic sound. The sound of one character talking to another, for example, would be diegetic. Any sound that the audience can hear but the characters on screen cannot is considered non-diegetic sound. Diegetic sound can be heard in a character's speech, the roar of a speeding car, or the bang of Clint Eastwood's revolver.
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