Transmission loss (duct acoustics) | StudentB Wikipedia Search

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Sound measurements
Characteristic	Symbols
Sound pressure	$p, SPL, L PA$
Particle velocity	$v, SVL$
Particle displacement	$δ$
Sound intensity	$I, SIL$
Sound power	$P, SWL, L WA$
Sound energy	$W$
Sound energy density	$w$
Sound exposure	$E, SEL$
Acoustic impedance	$Z$
Audio frequency	$AF$
Transmission loss	$TL$

v t e

Transmission loss (TL) in duct acoustics describes the acoustic performances of a muffler-like system. It is frequently used in the industry areas such as muffler manufacturers and NVH (noise, vibration and harshness) department of automobile manufacturers, and in academic studies. Generally the higher transmission loss of a system it has, the better it will perform in terms of noise cancellation.