Non-Pitched Atmospheric Sounds

Non-Pitched Atmospheric Sounds

Non-pitched atmospheric sounds are used in film making to create a similar feeling to what the score tries to establish, but in a more subtle fashion. They aren't usually very noticable unless you're looking for them, but will still have the effect regardless of if you're aware of a sound being played.

A brilliant example of the effectiveness of atmospheric sounds is Orin Peli's "Paranormal Activity". Often throughout the film, when there is a silence, an extremely low rumble is used to create subtle suspense and a feeling of uneasiness in the viewer.

Note how the extremely low frequency sound stops as soon as the door slams shut. The sound is used to build suspense, to make the viewer aware that something is going to happen. This is very effective on high end sound systems such as those in cinemas where the subwoofers can produce extremely low sounds. Found footage movies like this generally have no score or non-diegetic sounds, so these techniques are usually relied on to keep it subtle and make it feel more realistic than high-budget blockbuster.

Bernard Hermann

 Bernard Hermann was an American composer noted for his work in motion pictures.

Herrmann's involvement with electronic musical instruments dates back to 1951, when he used the theremin in The Day the Earth Stood Still. Robert B. Sexton has noted that this score involved the use of treble and bass theremin electric strings, bass, prepared piano, and guitar together with various pianos and harps, electronic organs, brass, and percussion, and that Herrmann treated the theremins as a truly orchestral section.

Herrmann was a sound consultant on The Birds, which made extensive use of an electronic instrument called the mixturtrautonium, although the instrument was performed by Oskar Sala on the film’s soundtrack. Herrmann used several electronic instruments on his score of It’s Alive as well.