Patent · US Expired

Reactive sound absorber

US6385321B1 · kind B1 · utility

7Cited by

3References

11Claims

0Family size

Assignee

FRAUNHOFER-GESELSCHAFT · DE

Inventors

Jan Krueger · Stuttgart, DE
Philip Leistner · Renningen, DE
Helmut Fuchs · Hall in Tirol, AT
Roland Lippold · Dresden, DE

Key dates

Filing date	Sep 2, 1999
Grant date	May 7, 2002
Priority date	—
Expiry date	Sep 2, 2019

Classification

Technology area (CPC G)Physics
CPC primaryG10K2210/32271
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

A reactive sound attenuator which includes a sensor for detecting a sound parameter in a space, e.g. a duct, consists of a signal amplifier that is used to amplify a detected signal, an electroacoustic transducer and a cavity with at least one membrane. The membrane, which is capable of moving in a vibratory manner, is part of a wall of a space, e.g. a duct wall. A sensor, which is disposed in the immediate vicinity of, in or on the membrane, detects the vibrations of the membrane. The sensor's signal, which is amplified and inverted by the amplifier, controls the membrane vibration via the electroacoustic transducer.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.