Transmission loss

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Sound measurements
Characteristic
Symbols
 Sound pressure p, SPL,LPA
 Particle velocity v, SVL
 Particle displacement δ
 Sound intensity I, SIL
 Sound power P, SWL, LWA
 Sound energy W
 Sound energy density w
 Sound exposure E, SEL
 Acoustic impedance Z
 Speed of sound c
 Audio frequency AF
 Transmission loss TL

Transmission loss (TL) in general describes the accumulated decrease in intensity of a waveform energy as a wave propagates outwards from a source, or as it propagates through a certain area or through a certain type of structure.

It is a terminology frequently used in optics and acoustics. Measures of TL are very important in the industry of acoustic devices such as mufflers and sonars.

Definition[edit]

Measurement of transmission loss can be in terms of decibels.

Mathematically, transmission loss is measured in dB scale and in general it can be defined using the following formula:

TL = dB

where:

  • is the power of incident wave coming towards a defined area (or structure);
  • is the power of transmitted wave going away from the defined area (or structure).

Applications[edit]

Transmission loss may refer to a more specific concept in one of the field below.

Electrical engineering[edit]

Duct Acoustics[edit]

Room Acoustics[edit]

Underwater Acoustics[edit]

References[edit]

  1. ^ ISO 18405:2017 Underwater acoustics - Terminology (International Organization for Standardization, Geneva, 2017)