Attenuation is the reduction in level of a signal when passing through a circuit element, or the reduction in level of vibration energy as it passes through a structure. Attenuation is commonly measured in Decibels, although it may be measured in percent. Attenuation is usually frequency dependent, i.e. the amount of attenuation present varies as a function of frequency. Attenuation of vibration energy in mechanical structures generally increases as frequency rises, but it can be a very complex function of frequency.
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