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Signal to noise ratio improvement of in situ absorption measurement using active noise control approach [Elektronski vir]
Šteblaj, Peter ...
It is important to have some information aboutsound absorption coefficient of already installed and appliedmaterials. A new in-situ method is proposed. Presentedmethod utilizes a dipole ...characteristic of the source. If thedipole is placed in vicinity of acoustical obstacle, sound field isdeformed and it depends only on the acoustical properties ofthe obstacle.When using a real dipole source, asymmetry of dipole ispresent, so an active noise control approach was used toreduce this effect. Consequently this led to better measuringresults and improvement of signal to noise ratio.
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