Absorbers with Active Components

  • Helmut V. Fuchs


Some of the passive and reactive sound absorbers and silencers discussed in Chaps. 4–7 have a long tradition in noise control and acoustic comfort business. The compound panel resonators of Sect. 5.3, the membrane absorbers of Sect. 6.3 and the tubular silencers of Sect. 7.3 represent new fiberless variants with particularly high, broadband effectiveness at low frequencies. “Active noise abatement” measures, also called “anti-noise”, nevertheless are continuously drawing much more vivid attention in the media. Due to their very complicated electro-acoustic and electronic design, they have, however, found only rather limited use in very special instances, for example in headsets for helicopter pilots. In contrast, the aim in what follows is to present a relatively simple principle for actively improving the performance of reactive absorbers. These have meanwhile proven to be successful as highly effective silencer units for low and medium frequencies especially in compact air-conditioning and heating systems.


Sound Pressure Wave Guide Noise Control Helmholtz Resonator Transfer Impedance 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.BerlinGermany

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