Film Language; Sound

Sound has been used in the film industry since 1927, and was first used in 'The Jazz Singer'. There are many effective sound techniques that make films more interesting, and can change the feel of a film. 

Catagorising Sounds

On Screen Sound: Sound coming from the screen. EG: If you can see a radio on screen, and the radio is playing.

Off Screen Sound: Sound that can be heard by objects off of the screen. EG: The audience can hear a radio playing, but can't see the radio. 
Diegetic Sound: Sound that the actors can hear a radio playing but can't see the radio.

Non-Diegetic Sound: Sound that the actors can't hear, that isnt part of the film. EG: Music to 'set the scene'. 

Sound Bridges : When a piece of music whether it be diegetic or non-diegetic, continues from one shot to the next.

Parallel: Sound is complimentary to the scene so it makes sense. EG: Children having fun on a beach. You would hear laughter, splashing and happy music.

Contrapuntal sound: Music that doesn't fit the scene. EG: In jaws, there are children splashing in the sea, and the shark starts to approach, there should be scary music, and screams from the children, but there is still laughter, and splashing.