RESEARCH PAPERS: Active Noise Control

An Active Sound Absorber With Porous Plate

[+] Author and Article Information
D. Guicking, E. Lorenz

Drittes Physikalisches Institut, University of Göttingen, Göttingen, Federal Republic of Germany

J. Vib., Acoust., Stress, and Reliab 106(3), 389-392 (Jul 01, 1984) (4 pages) doi:10.1115/1.3269206 History: Received December 13, 1983; Online November 23, 2009


An active equivalent of the λ/4 resonance absorber with a porous plate or foil of flow resistance ρc is described. The porous layer is backed by a loudspeaker driven such that zero sound pressure is maintained in the air gap between foil and speaker. The simultaneous control of magnitude and phase has been achieved in analog technique by a combination of open-loop and closed-loop control, utilizing single sideband modulation of the compensation signal with a weak infrasonic auxiliary signal. The on-off ratio of the reflection coefficient reaches −60 dB for sinusoidal sound, and −20 dB for broadband noise.

Copyright © 1984 by ASME
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In