Selective sound is used to emphasize key elements, ambient sound creates atmosphere, and sound bridges help transitions flow smoothly. Diegetic sounds belong to the world on screen like voices or doors, while non-diegetic sounds like music have no visible source. Synchronous sounds match the action, asynchronous sounds originate outside the scene, and contrapuntal sounds mismatch the visuals. Voiceovers guide the audience and theme music develops through the film.

1. Sounds
Selective sound is used to emphasise key sounds elements within a sequence.
Ambient sound is used to create atmosphere or a sense of place.
Sound bridges, the use of sound to help transitions between sequences pass more fluidly.
Sound effects are used to create a sense of realismor to create some psychological impact
or effect.
Diegetic sound
Everything that we see on screen belongs to diegetic sound like a door opening or a
keyboard typing. It belongs to the world you have created like voices of characters.
Non diegetic sound
This is background music or other things that you can’t see and you can’t see the source of
the sound. Any narrator and voice over are non-diegetic sounds and when a gun shots are
because the sounds have been amplified just like explosions.
Synchronous sounds, this is when sound effects are matched with the action to reinforce
the effect.
Asynchronous sound this is when the sound originates from the outside of the diegetic
reality of the film.
Contrapuntal sound is when a sound or voice doesn’t match the visuals.
Voiceover this is the voice of a character. This voice often guides or informs the audience.
Theme music is the music that introduces and develops throughout the film.
Musical score used to create atmosphere to link shots or sequences.
Silence this effect is occasionally used to provoke a reaction from the audience.