The sound that represents a character's thoughts without the character speaking aloud is called off-screen sound.
Sounds that come from the world of video and cinema are called diegetic sounds. It can happen either on-screen or off-screen, but always at the same time as the action occurs. A non-diegetic sound is any sound in a film that is not from the world of the film.
Non-diegetic sound. Diegetic sounds are sounds that a character or character speaking can hear on-screen. For example, when one character talks to another character, the voice becomes diegetic. Non-diegetic noise is the noise that is audible to the audience but not to the characters on screen.
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