An acoustic barrier may be an acoustic wall such as that close to a motorway designed to reduce noise propagation or a partition between two volumes/rooms to reduce noise transmission.
The acoustic performance of barriers come into play in many different systems:
- Exterior walls, windows and doors of buildings to reduce noise from outside.
- Interior walls and ceilings to reduce noise from adjacent rooms.
- Fences along the side of busy roads to reduce noise propagation to nearby dwellings.
There are a number of particular features that control the transmission loss performance of an acoustic partition:
- Mass per unit area
- Single or double layer
- Isolation of multiple layers
- Absorption between layers
- Panel damping
A barrier that reduces the noise on one side, such as the interior of a building. These may be described by a transmission loss or sound transmission class.
A rule for estimating the transmission loss of a barrier in its mass controlled region. The rule states that transmission loss increases/decreases 6 dB for each doubling/halving of either frequency or barrier surface density.
See also: Barrier, Building Acoustics, Coincidence, Decibel, Double Acoustic Barrier, Flanking Sound Transmission, Holes in Acoustic Barriers, Room Acoustics, Single Acoustic Barrier, Sound Transmission Class, Sound Transmission Loss.