Nondiegetic sound is the same as synchronous sound.

Name: Nondiegetic sound is the same as synchronous sound.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Nondiegetic sound refers to any sound that comes from a source outside of the story world, such as background music or a narrator's voiceover. Synchronous sound refers to sound that is synchronized with the action on screen. While synchronous sound can be nondiegetic (e.g. a character's thoughts heard as a voiceover), not all nondiegetic sound is synchronous.

Nondiegetic Sound Is the Same as Synchronous Sound