 Reverberation time
Reverberation is caused by reflection of sound.
Reverberation time is the time for the sound intensity to
decay to
10-6 the initial intensity or decay by 60 dB.
remember: sound intensity = power/area
Reverberation involves multiple reflected wave that arrive at different times.
Several of the more important acoustical criteria arise from
the reverberation time of a room and the characteristics
of the reverberant sound.
In any room the direct sound from the source arrives first at the
listener, followed shortly thereafter by the reflected sound.
The reflected sound is composed of the original wave reflected
from the four walls, the ceiling and floor, plus the successive
reflections of these waves. Because of the decrease in intensity of the
wave as it propagates (the inverse square law) and the absorption
of some f its energy each time the wave reflects off a surface,
the later and reflected waves a listener receives are lower in
intensity.
Optimal reverberation times for various enclosures defined for
different purposes.
Examples:
Summarizing:
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Reverberation