REVERBERATION
The continued existence
of sound in a contained space after the original source has stopped producing
the sound. In other words, echoes producing more echoes. The sound waves are
absorbed by the surroundings but also reflected within that space, gradually decreasing
in amplitude. Each type of venue requires its own specific reverberation time
values (depending on the types of sound, dimensions of the venue and
temperature)
REVERBERATION TIME
(RT)
For a direct sound to
decay 60 dB, the reverberation time is RT60. The reverb value can be measured in
different bands of frequency.
Suggested time for
cinema: 0.8-1.2 seconds
ABSORPTION
The value that indicates
the absorption qualities of material is in between 0 to 1. Where 1 would be an
open window that sound would completely pass through without any reflection. 0
would be a really thick concrete wall.
Why Reverberation is
important:
So that the sounds from
one scene does not linger when another scene is being projected.
How to control it:
Lining the rear wall
with thick material that absorbs the sounds to prevent direct reflection of the
sounds from the speakers into the audience. Lining on the side walls as well.
Without the acoustic paneling, the echoes would interfere with the next set of
sounds from the speakers.
Sources:
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