# US 2025/0095668 A1 · Input selection for wind noise reduction on wearable devices

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- Number: US 2025/0095668 A1
- Document ID: US20250095668A1
- Status: Published application
- Kind: A1
- Application number: 18/970,409
- Filed: 2024-12-05
- Published: 2025-03-20
- Earliest claimed: 2022-08-30
- Assignees: Bose Corporation
- Applicants: Bose Corporation
- Inventors: Douglas George Morton; Olivia Montana Canavan; Yang Liu
- Web page: https://patentgrep.com/patent/US20250095668A1

## CPC

- G10L 21/0232: Processing in the frequency domain
- G10K 11/17823: {Reference signals, e.g. ambient acoustic environment}
- G10K 11/17837: {by retaining part of the ambient acoustic environment, e.g. speech or alarm signals that the user needs to hear}
- G10K 11/17857: {Geometric disposition, e.g. placement of microphones}
- G10K 11/17873: {using a reference signal without an error signal, e.g. pure feedforward}
- G10L 21/0208: Noise filtering
- H04R 1/1016: {Earpieces of the intra-aural type}
- H04R 1/1083: {Reduction of ambient noise (active noise reduction per se G10K11/175; protective devices for the ear, e.g. providing acoustic protection A61F11/06)}
- H04R 1/406: {microphones}
- H04R 3/005: {for combining the signals of two or more microphones (specially adapted for hearing aids H04R25/407)}
- G10K 2210/1081: Earphones, e.g. for telephones, ear protectors or headsets
- G10K 2210/3027: Feedforward
- G10K 2210/3215: Arrays, e.g. for beamforming
- G10L 2021/02166: {Microphone arrays; Beamforming}
- H04R 1/1075: {Mountings of transducers in earphones or headphones}
- H04R 3/04: for correcting frequency response
- H04R 2201/107: Monophonic and stereophonic headphones with microphone for two-way hands free communication
- H04R 2410/01: Noise reduction using microphones having different directional characteristics
- H04R 2410/05: Noise reduction with a separate noise microphone
- H04R 2410/07: Mechanical or electrical reduction of wind noise generated by wind passing a microphone
- H04R 2420/01: Input selection or mixing for amplifiers or loudspeakers
- H04R 2420/07: Applications of wireless loudspeakers or wireless microphones
- H04R 2430/03: Synergistic effects of band splitting and sub-band processing
- H04R 2460/01: Hearing devices using active noise cancellation
- G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)

## Abstract

A wind noise reduction system including a beamformer, a comparator, and a voice mixer is provided. The beamformer may be an MVDR beamformer, and generates a beamformed signal based on a first microphone signal and a second microphone signal. The comparator generates a comparison signal based on the beamformed signal and a wind microphone signal. The comparison signal may be further based on a beamformed energy level of the beamformed signal and a wind energy level of the wind microphone signal. The voice mixer generates an output voice signal based on the beamformed signal, the wind microphone signal, and the comparison signal. The wind noise reduction system may further include a wind microphone corresponding to the wind microphone signal. The wind microphone may be arranged on a portion of a wearable audio device configured to be seated in a concha of a wearer.

## Claims

### Claim 1

A wind noise reduction system comprising:
a minimum variance distortionless response (MVDR) beamformer configured to generate a beamformed signal based on a first microphone signal and a second microphone signal;
a comparator configured to generate a comparison signal based on the beamformed signal and a wind microphone signal; and
a dynamic voice mixer configured to generate an output voice signal based on the beamformed signal, the wind microphone signal, and the comparison signal.

### Claim 2 (depends on 1)

The wind noise reduction system of claim 1, wherein the comparison signal is further based on a beamformed energy level of the beamformed signal and a wind energy level of the wind microphone signal.

### Claim 3 (depends on 1)

The wind noise reduction system of claim 1, wherein the output voice signal is a blend of the beamformed signal and the wind microphone signal.

### Claim 4 (depends on 3)

The wind noise reduction system of claim 3, wherein a ratio of the wind microphone signal to the beamformed signal in the output voice signal corresponds to the comparison signal.

### Claim 5 (depends on 4)

The wind noise reduction system of claim 4, wherein the ratio of the wind microphone signal to the beamformed signal in the output voice signal is frequency dependent.

### Claim 6 (depends on 1)

The wind noise reduction system of claim 1, wherein the output voice signal corresponds to the wind microphone signal at a frequency range of 200 Hz to 2 kHz.

### Claim 7 (depends on 1)

The wind noise reduction system of claim 1, further comprising:
a first microphone corresponding to the first microphone signal;
a second microphone corresponding to the second microphone signal; and
a wind microphone corresponding to the wind microphone signal.

### Claim 8 (depends on 1)

The wind noise reduction system of claim 1, wherein the first microphone signal, the second microphone signal, and the wind microphone signal are frequency domain signals.

### Claim 9 (depends on 1)

The wind noise reduction system of claim 1, wherein the first microphone signal, the second microphone signal, and the wind microphone signal are time domain signals.

### Claim 10 (depends on 1)

The wind noise reduction system of claim 1, further comprising an equalizer configured to filter the beamformed signal prior to the beamformed signal being received by the comparator and the dynamic voice mixer.

### Claim 11 (depends on 1)

The wind noise reduction system of claim 1, further comprising a high pass filter configured to filter the beamformed signal prior to the beamformed signal being received by the dynamic voice mixer.

### Claim 12 (depends on 1)

The wind noise reduction system of claim 1, further comprising a feedforward noise cancellation controller for performing feedforward noise cancellation, wherein the feedforward noise cancellation controller receives an input corresponding to the wind microphone signal.

### Claim 13

A method for reducing wind noise, comprising:
generating, via a minimum variance distortionless response (MVDR), a beamformed signal based on a first microphone signal and a second microphone signal;
generating, via a comparator, a comparison signal based on the beamformed signal and a wind microphone signal; and
generating, via a dynamic voice mixer, an output voice signal based on the beamformed signal, the wind microphone signal, and the comparison signal.

### Claim 14 (depends on 13)

The method of claim 13, further comprising:
generating, via a first microphone, the first microphone signal;
generating, via a second microphone, the second microphone signal; and
generating, via a wind microphone, the wind microphone signal.

### Claim 15 (depends on 13)

The method of claim 13, wherein the comparison signal is further based on a beamformed energy level of the beamformed signal and a wind energy level of the wind microphone signal.

### Claim 16 (depends on 13)

The method of claim 13, wherein the output voice signal is a blend of the beamformed signal and the wind microphone signal.

### Claim 17 (depends on 16)

The method of claim 16, wherein a ratio of the wind microphone signal to the beamformed signal in the output voice signal corresponds to the comparison signal.

### Claim 18 (depends on 17)

The method of claim 17, wherein the ratio of the wind microphone signal to the beamformed signal in the output voice signal is frequency dependent.

### Claim 19 (depends on 13)

The method of claim 13, wherein the output voice signal corresponds to the wind microphone signal at a frequency range of 200 Hz to 2 kHz.

### Claim 20 (depends on 13)

The method of claim 13, wherein the beamformed signal is filtered by a high pass filter prior to the beamformed signal being received by the dynamic voice mixer.