Device, system and process for audio signal processing

US11107454B2 · kind B2 · utility

Assignee

• DRÄGER SAFETY AG & CO. KGAA · DE

Inventors

• Achim Volmer · Wulfen, DE
• Michael BRODERSEN · Lübeck, DE
• Jens Reermann · Achim, DE

Key dates

• Filing date: Mar 16, 2020
• Grant date: Aug 31, 2021
• Expiry date: Mar 16, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04R2460/01
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

An audio processing device (100) includes a correction microphone (110), a reference microphone (120), a classification unit (130), an active noise cancellation (ANC) unit (140), and a speaker (150). The correction microphone is arranged in an area adjacent to an ear of a user of the device and picks up acoustic signals in the area and outputs same as a correction signal. The reference microphone picks up surrounding noises (124) from a surrounding area of the user and outputs same as a reference signal. The classification unit receives the reference signal and splits the reference signal corresponding to a spectrum and amplitude thereof into signal components of two or more classes and outputs a classified signal. The ANC unit receives and processes the correction signal based on the classified signal and outputs a corresponding audio signal. The speaker receives the audio signal and provides a corresponding acoustic signal output.