vibration isolation
10.67 vibration isolation. Reduction achieved in the ability of a system to vibrate in response to a mechanical oscillation through the use of a resilient coupling. Annotation See also 4.24.
shielding
10.66 shielding. Phenomenon whereby sound reduction is provided by interposing a wall or partition between a sound source and a receiver.
insertion loss
10.65 insertion loss. Of a silencer or other sound-reducing element in a specified frequency band, the decrease in sound pressure level measured at the location of the receiver when a sound insulator is inserted in the transmission path between the sound source and the receiver. Unit, decibel (dB). Annotation See also 6.71.
duct lining
10.64 duct lining. Layer of porous material placed on the inner surface of a duct to attenuate sound that propagates through the duct.
critical frequency
10.63 critical frequency. Of a panel or partition, the lowest frequency at which the coincidence effect occurs. Unit, hertz (Hz).