AUTOMATIC POLARITY ADAPTATION FOR AMBIENT NOISE CANCELLATION

• US 20120148060A1
• Filed: 12/10/2010
• Published: 06/14/2012
• Est. Priority Date: 12/10/2010
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.), Sony Mobile Communications AB (Sony Group Corp.)
• Original Assignee: Sony Ericsson Mobile Communications USA Incorporated (Sony Group Corp.)
• Inventors: ISBERG, Peter
• Granted Patent: US 8,571,226 B2
• Time in Patent Office: Days
• US Class Current: 381/71.1
• CPC Class Codes: G10K 11/17825 Error signals
• CPC Class Codes: G10K 11/1783 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
• CPC Class Codes: G10K 11/17854 the filter being an adaptive filter
• CPC Class Codes: G10K 11/17857 Geometric disposition, e.g. placement of microphones
• CPC Class Codes: G10K 11/17875 using an error signal without a reference signal, e.g. pure feedback
• CPC Class Codes: G10K 11/17885 additionally using a desired external signal, e.g. pass-through audio such as music or speech
• CPC Class Codes: G10K 2210/1081 Earphones, e.g. for telephones, ear protectors or headsets
• CPC Class Codes: G10K 2210/3016 Control strategies, e.g. energy minimization or intensity measurements

Abstract

A sound reproducing device has a loudspeaker arranged to produce sound from an audio signal provided by an audio signal source. A microphone is positioned to pick up ambient noise and generate a microphone signal which comprises the noise. An ambient noise cancellation (ANC) system receives the microphone signal from the microphone and generates anti-noise corresponding to the ambient noise in the microphone signal. An automatic polarity adaptation (AAP) system monitors the ANC system and, when a decision criterion is fulfilled, causes a switch in polarity for the generated anti-noise.

Claims

7-1. A portable communication apparatus, comprising a sound reproducing device as defined in claim 1.

8. An ambient noise cancellation method, involving:

picking up ambient noise to generate a microphone signal;

providing ambient noise cancellation (ANC) to generate anti-noise corresponding to the ambient noise in said microphone signal;

monitoring the ambient noise cancellation;

determining that a decision criterion is fulfilled; and

causing a switch in polarity for the generated anti-noise.