Patent · US Active

Active noise reduction system

US8903101B2 · kind B2 · utility

11Cited by

3References

19Claims

0Family size

Assignee

HARMAN BECKER AUTOMOTIVE SYSTEMS GMBH · DE

Inventors

Markus Christoph · Straubing, DE
Michael G. Wurm · Waukesha, US
Michael Perkmann · Wien, AT

Key dates

Filing date	Feb 25, 2011
Grant date	Dec 2, 2014
Priority date	—
Expiry date	Jan 14, 2033

Classification

Technology area (CPC G)Physics
CPC primaryG10K2210/3055
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

A system for actively reducing noise at a listening point, includes an earphone housing, a transmitting transducer, a receiving transducer and a controller. The transmitting transducer converts a first electric signal into a first acoustic signal, and radiates the first acoustic signal along a first acoustic path having a first transfer characteristic and along a second acoustic path having a second transfer characteristic. The receiving transducer converts the first acoustic signal and ambient noise into a second electrical signal. The controller compensates for the ambient noise by providing a noise reducing electrical signal to the transmitting transducer. The noise reducing electrical signal is derived from a filtered electrical signal that is provided by filtering the second electrical signal with a third transfer characteristic. The second and the third transfer characteristics together model the first transfer characteristic.

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