Attenuation is the reduction of a physical quantity, the opposite of amplification. Within acoustics and structural dynamics it is normally presented as the logarithm of input divided by output.

The opposite of amplification.


The degree to which an input signal is reduced in amplitude at the output of a circuit or device. Attenuation is typically expressed in dB.


The reduction of the intensity of radiation upon passage through a medium. The attenuation is caused by absorption and scattering.

See also: Attenuator, Decibel.

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Subjects: Physics