Sound In Film

sound in film

Diegetic sound 

Sound whose source is visible on the screen or whose source is implied to be present by the action of the film: 
  • voices of characters 
  • sounds made by objects in the story 
  • music represented as coming from instruments in the story space ( = source music)
Diegetic sound is any sound presented as originated from source within the film's world 
Digetic sound can be either on screen or off screen depending on whatever its source is within the frame or outside the frame. 
Another term for diegetic sound is actual sound 

definitions:

title music-music played during the credits at the beginning or end of a television programme or film.

https://www.youtube.com/watch?v=sIl-mojldus

score/incidental music-incidental music is often "backgroundmusic, and is intended to add atmosphere to the action.

https://www.youtube.com/watch?v=5R3Xg9GVz78

sound motifs- a motif can help produce other narrative aspects such as theme or mood.

https://www.youtube.com/watch?v=62M2qZixyFI

sound effects-a sound other than speech or music made artificially for use in a play, film, or other broadcast production.

https://www.youtube.com/watch?v=WnozP8OWeik

voice over-a piece of narration in a film or broadcast, not accompanied by an image of the speaker.

https://www.youtube.com/watch?v=gS1qG_haFBk

non-diegetic sound 

Sound whose source is neither visible on the screen nor has been implied to be present in the action: 
  • narrator's commentary
  • sound effects which is added for the dramatic effect
  • mood music
Non-diegetic sound is represented as coming from the a source outside story space. 
The distinction between diegetic or non-diegetic sound depends on our understanding of the conventions of film viewing and listening.  We know of that certain sounds are represented as coming from the story world, while others are  represented as coming from outside the space of the story events.  A play with diegetic and non-diegetic conventions can be used to create ambiguity (horror), or to surprise the audience (comedy). 
Another term for non-diegetic sound is commentary sound. 

definitions:

synchronous sound-existing or occurring at the same time.

https://www.youtube.com/watch?v=cHxLH3WEffE
https://www.youtube.com/watch?v=dkTYpP6eec0

sound effects-a sound other than speech or music made artificially for use in a play, film, or other broadcast production.

https://www.youtube.com/watch?v=WnozP8OWeik

dialogue- a conversation between two or more people as a feature of a book, play, or film.

https://www.youtube.com/watch?v=QWADR55LDDM

ambient sound-relating to the immediate surroundings of something.

https://www.youtube.com/watch?v=cDOOuaHGDgs

non-diegetic vs diegetic --   

https://www.youtube.com/watch?v=jd0kQLD7JS8

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