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A loudspeaker and a microphone will be mounted on the acoustic duct.
An acoustic duct or plane wave tube is a test facility used in acoustics.
In this case, a plane wave acoustic duct with anechoic termination provides a practical alternative.
Also, we have an acoustic duct with loudspeaker actuators and microphone sensors which can be used for active noise control experiments.
A highly accurate one-dimensional electroacoustic model of an acoustic duct has been developed, which will be used to explore the extent to which noise reduction is possible in this case.
The comparison between an acoustic duct and an electrical transmission line is useful in "lumped-element" modeling of acoustical systems, in which acoustic elements like volumes, tubes, pistons, and screens can be modeled as single elements in a circuit.
Acoustic ducts are most commonly used by National Measurement Institutes that specialise in acoustical measurement (such as the National Physical Laboratory (United Kingdom)), who use them for measurement microphone calibration at low frequencies.
It had open acoustical ducts.
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