What does Non-Diegetic Sound mean?
Non-Diegetic Sound refers to sound in a film or television production that does not originate from within the story world — audio that the characters cannot hear, existing only for the audience. The most common examples are the film score or soundtrack music, voiceover narration from outside the story, and sound effects added in post-production to enhance the audience’s emotional experience. Non-diegetic sound is a powerful storytelling tool that directors and composers use to guide the audience’s emotional response without being visible on screen.
Example:As the child actor’s character walked home alone in the rain, the non-diegetic score swelled beneath the scene — music that only the audience could hear, intensifying the emotional weight of her isolation without a single word of dialogue.
Example: The documentary filmmaker used a non-diegetic voiceover narration to provide historical context between interview segments, giving the audience information that existed outside the events being depicted on screen.
Did you know?
The boundary between diegetic and non-diegetic sound is not always fixed — some films deliberately blur the line in creative ways. In Spike Jonze’s film Her, the protagonist falls in love with an AI, and the film’s score was composed by Arcade Fire. At several points, the music seems to exist both within and outside the story world simultaneously, creating an intentional ambiguity that reinforces the film’s themes about the nature of connection.
You can also find “Non-Diegetic Sound” and related terms in this category: Editing and Post-Production.
