- The Diegetic sound is anything that is part of the story that you can see is being made on screen. So for example a tiger thumping its paws on the ground would be diegetic. Also people speaking would be diegetic, and even someone playing an instrument would be diegetic. In short it is anything that is part of the story.
- External Diegetic sound is a sound that comes from a physical source within the story that we assume the other characters can hear. For example there could be a generator humming that has little to do with the scene but the characters can hear it.
- Internal Diegetic sound is a sound that comes from the mind of the character that only that one character can hear. Take the original Carrie film for example, towards the end of the film the main character "Carrie" has pig blood dumped on her as a prank. And in her rage she can only hear the dripping of said blood on the floor and hears none of the others laughter, or screams as they are killed.
- Non-Diegetic sound Sound whose source is neither visible on the screen nor has been implied to be present in the action. For example narrator's commentary, sound effects which is added for the dramatic effect and mood sound.
Jaws
Take the film Jaws for example. We all know the soundtrack for this film, we all know the "Budum, budum," it makes and adds the tension to the scene with the shark, you could watch the first few scenes in the film where it does not show the shark but know it is near just because of this soundtrack, and you keep watching, letting your tension build until the scene arrives where you finally see that blood thirsty shark and it delivers an impact on you that wouldn't be nearly as effective without the soundtrack. Just imagine watching the film where the only sounds are that which are caught on camera, this being dialogue, waves and some background noise. Imagine just seeing the underwater shots where there is barely anything to hear. It would build little to no tension and would be pretty boring to watch.Sounds used in Jaws are the waves and open sea sounds of the ocean. The underwater sounds of the shark swimming. Screams of its victims (Especially in the beach scene). And a lot more. This all sets the scene of the film perfectly. The open sea sounds work as a big tension builder, this is due to the fact that when you are so far out to sea where all you can hear is ocean sounds then there will be no one around to hear you scream. There is a big use of Foley sounds in this film with the shark scenes. The sound footage caught was of little to no use in the film as when editing the sound jumped. This lead to a Foley sound team to record ocean sounds. Bring in people to scream in terror to a microphone for the beach scene and record underwater sounds.
Catfish
A very successful documentary where a small group of guy start off making it about a talented little girl only to discover that she doesn't exist and it is a fake persona put on by a lonely couple in another part of the country. Watching the documentary you do not notice the soundtrack much until the end. And the soundtrack changes your whole opinion of the couple who lied about who they were. When they are talking about why they did it the soundtrack adds to it by making you feel sorry for them and understand why they did it to a certain extent.
To summarise, in visual media the soundtrack is highly important in creating a mood. It works the viewers emotions and can make or break the finished production in terms of viewer-ship and discussion of the project. Without soundtrack there is a whole new mood and it isn't nearly as effective on the audience as it is with the soundtrack.
Sources
http://answers.yahoo.com/question/index?qid=20101022132839AAxll4z
Accessed on 30/10/2013
http://filmsound.org/terminology/diegetic.htm
Accessed on 30/10/2013
http://english2.mnsu.edu/sewelm/glossary/glossary_sound_internal.htm
Accessed on 04/11/2013
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