Sound can be seen as 50% of the entire film. It is used to establish tone, atmosphere, and to help convey different clues about the plot to the audience, as well as portray details about different characters and to, in general, identify the genre of the film. It allows the audience to engage with what is happening with the film, as it is able to add depth to the picture. It can make the film seem 3 dimensional, as it creates realism for the audience, which then encapsulates the viewers attention.
In films, there are multiple sound terms used. Some of these terms consist of:
Ambient Sound - Background sounds presented in a scene.
Diegetic - Sound that is visible in the film.
Non-diegetic - Sound not visible in the film, which is added in post production.
Dubbing - Adding musical sounds in the background.
Foley - Making sound effects in post-production to add realism to the film.
Sound bridge - Sound that carries over a transition.
Diegetic sound within the scene is able to create a sense of naturalism, however it is unable to fully reflect feeling or tone. The use of non-diegetic sound, however, is able to help the viewer what different characters are feeling, and can relay to the audience what they should be feeling regarding the sequence.
If there is only diegetic sound, the scene lacks tension and, despite being more realistic, can feel extremely awkward. However, if there is just non-diegetic audio, the sequence can seem lacklustre and, despite setting tension, seems confusing as we don't understand the characters. Furthermore, it makes it seem 2D. This is why the use of layering of sound to combine diegetic and non-diegetic sound is important as it can show the true value of tension.
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