Measures for active noise reduction in interior spaces have been tested by the Hamburg researchers successfully for two different scenarios: Local ANC measures create a limited quiet zone within a room. Incident background noise is absorbed by microphones, evaluated electronically and then the appropriate reverse sound is generated via loudspeakers. In the laboratory test the disturbing noise in the head area of a bed could be reduced by up to 20 dB, which is subjectively experienced as an almost complete disappearance of the disturbance.
As a global measure the Active Sound Blocker works on the other hand directly at the noise source. Here disturbing noise emissions are immediately absorbed by reverse sound. Thus, for example, the noise during testing of equipment and machinery can be reduced effectively. The tested systems can reduce both noise and tonal noise. A market launch lies ahead in the short term.
Project Operation:
Helmut-Schmidt-Universität
Universität der Bundeswehr Hamburg
Institut für Mechanik
Holstenhofweg 85
22043 Hamburg
Telefon 040|6541-2733
sachau@hsu-hh.de
www.hsu-hh.de\mechatronik
Ref. 24483/27381
