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- Sound transmission loss (TL) of a material or
building partition is a measure of sound isolation ability. Expressed in
decibels, it is 10 times the logarithm to the base 10 of the reciprocal
of the sound transmission coefficient of the partition. Mathematically,
this is represented as
TL = 10 log 1/t
Unless otherwise specified, the sound fields on both
sides of the partition are assumed to be diffuse
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Of a partition, in a specified frequency band, ten times the common logarithm of
the ratio of the airborne sound power incident on the partition to the sound
power transmitted by the partition and radiated on the other side. The quantity
so obtained is expressed in decibels. The reduction in sound level when sound
passes through a partition or ceiling system.
Source:
http://www.owenscorning.com/around/sound/glossary.asp
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