Sounds get absorbed as they travel through objects such as walls (similar to atmospheric absorption in the case of traveling through a medium). Transmission loss models are needed to realistically simulate sounds outside a window or in the next room.

The decrease of loss in power during transmission of energy from one point or another. Usually expressed in decibels.

Total loss encountered in transmission through a system.

The decrease in signal energy in transmission along a circuit due to resistance or impedance.

Energy losses as the pressure wave, or sound, travels through the water, the associated wavefront diminishes due to the spreading of the sound over an increasingly larger volume and the absorption of some of the energy by seawater.

Electric energy lost due to the transmission of electricity. Much of the loss is thermal in nature due to the electrical resistance of the transmission wire.

The measure of the sound insulating properties of a material or structure, expressed as the number of decibels by which a sound is reduced in passing from one barrier (e.g. a wall or furniture) to another.

The decrease or loss in power during transmission of energy from one point to another. Usually expressed in decibels.

Similar to Noise Reduction but removes influence of size of test sample and amount of sound absorption of test room. TL is reported, in decibels for individual octave or 1/3 octave frequency bands.

Total loss suffered by a lightwave through a system due, for example, to the attenuation created by the fibre, connector, splices etc.