Sound Transmission Coefficient
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5. Sound Transmission Coefficient

(a) Sound transmission coefficient (T):

It is the ratio which the sound energy of a given frequency transmitted through a surface to that incident on it.

(b) Sound Reduction Index (SRI):


For composite partitions of n nos. of surface parts, the average transmission coefficient TAV can be found from the following equation:


where Ti = transmission coefficients of the ith part

Ai = area of the ith part

A = total area of partition =