RESEARCH PAPERS: Active Noise Control

Active Impedance Control for One-Dimensional Sound

[+] Author and Article Information
D. Guicking, K. Karcher

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

J. Vib., Acoust., Stress, and Reliab 106(3), 393-396 (Jul 01, 1984) (4 pages) doi:10.1115/1.3269207 History: Received December 12, 1983; Online November 23, 2009


Generalizing the concept of active sound absorption, a system for active impedance control has been developed, so far for plane waves at normal incidence. The active reflector is a loudspeaker driven by the incident sound wave. Its feeding signal is derived from a “wave separator” with two microphones splitting up the standing wave field into incident and reflected wave. This system permits easy control of the reflection coefficient and eliminates feedback instability. Arbitrary reflection coefficients between almost 0 and about 1.5 have been realized in the frequency range from below 100 Hz to more than 800 Hz.

Copyright © 1984 by ASME
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