Abstract
Jessel's theory of active sound absorption has allowed the design and construction of practical systems. In this paper, two recent tripolar absorbers are described and a few experimental results are presented. Absorption experiments were performed successively on pure tones, narrow band noise and broadband noise, propagating in an air conditioning duct. For these three categories of noises, the attenuations achieved were respectively 45 dB, 15 dB and 10 dB.
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