It helps us to distinguish music and speech from other sounds. Pitch also serves to distinguish among objects. Pitch can also serve more specific purpose in a film. When we call someone's voice nasal or certain musical tone mellow, we are referring to timbre. In everyday life, recognition of familiar sound is largely a matter of various aspects of timbre.
Filmmakers manipulate timbre continually.
Timbre can help articulate portions of the sound track, as when it differentiates musical instruments from another. As fundamental components of film sound, loudness, pitch and timbre interact to define the overall sonic texture of a film. At the most elementary 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. Citizen Kane offers a wide range of sound manipulations.