T

Threshold of Audibility (hearing)
The sound pressur elevel below which a normal human being cannot hear.

Threshold of Pain
The sound pressure level at which an average human being experiences physical pain in the ear.

Transmission Loss (TL)
A logarithmic measure of the decrease in sound power during transmission from one point to another (or through a panel, wall, etc.,); a value in decibels equal to 10 times the logarithm to the base 10 of the ratio of transmitted-to-incident sound power.