Noise reducing sound reproduction system

US9613612B2 · kind B2 · utility

Assignee

• AKG Acoustics GmbH · AT

Inventors

• Michael Perkmann · Wien, AT
• Peter Tiefenthaler · Munich, DE

Key dates

• Filing date: Jul 25, 2012
• Grant date: Apr 4, 2017
• Expiry date: Apr 4, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G10K2210/32272
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A noise reducing sound reproduction system and method is disclosed, in which an input signal is supplied to a loudspeaker by which it is acoustically radiated. The signal radiated by the loudspeaker is received by a microphone that is acoustically coupled to the loudspeaker via a secondary path and that provides a microphone output signal. The microphone output signal may be subtracted from a useful-signal to generate a filter input signal. The filter input signal may be filtered in an active noise reduction filter to generate an error signal. The useful-signal may be subtracted from the error signal to generate the loudspeaker input signal, and the useful-signal may be filtered by one or more low-pass filters prior to subtraction from the microphone output signal.