The three aspects of sound we perceive are:
Loudness
Pitch
Timbre
As fundamental components of film sound, loudness, pitch and timbre interact to define the overall sonic texture of a film. At the most basic level, these three acoustic factors enable us to distinguish the various sounds in film. For example, these qualities enable us to recognize different characters' voices.
The rhythm, melody, harmony and instrumentation of the music can strongly affect the viewer’s emotional reactions. Also, a melody, musical phrase or sound effect can be associated with a particular character, setting, situation or idea creating a sound motif.
By reordering and varying sound motifs , the filmmaker can compare scenes, trace patterns of development, and suggest implicit meanings. A musical score can create, develop, and associate motifs that enter into the film’s overall form.
Sound guides the viewer’s attention. Normally, this means clarifying and simplifying the sound track so that important material stands out. Dialogue , the transmitter of story information, is usually recorded and reproduced for maximum clarity.
Important lines should not have to compete with music or background noise. Sound effects are usually less important and supply an overall sense of a realistic environment. However, if they were missing the silence would be distracting. Music is also subordinate to dialogue, noticeable during pauses in dialogue and transitions.
Dialogue does not always rank highest in importance. Sound effects are central to action sequences. Imagine a car chase without squealing tyres. Music can dominate dance scenes, transitions, or very emotional moments with no dialogue.
Lastly, while creating a sound track, the filmmaker must select sounds that will fulfill a particular function. Usually, the filmmaker will provide a clearer, simpler sound world than that of everyday life. This helps the audience to focus on only the sound which is important and not needless background noise.
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