# US 2019/0172440 A1 · Noise-Canceling Headphone

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- Number: US 2019/0172440 A1
- Document ID: US20190172440A1
- Status: Published application
- Kind: A1
- Application number: 16/306,258
- Filed: 2016-06-01
- Published: 2019-06-06
- Earliest claimed: 2016-06-01
- Assignees: Foster Electric Company, Limited
- Applicants: Foster Electric Company, Limited
- Inventors: Shinya Ashizawa
- Web page: https://patentgrep.com/patent/US20190172440A1

## CPC

- G10K 11/17857: {Geometric disposition, e.g. placement of microphones}
- G10K 11/178: by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K 11/17813: {characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms}
- G10K 11/17873: {using a reference signal without an error signal, e.g. pure feedforward}
- H04R 1/02: Casings; Cabinets {; Supports therefor;} Mountings therein (H04R1/28 takes precedence {; attachments for microphones H04R1/08; mounting of transducers in earpieces H04R1/1075})
- 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 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 2210/3026: Feedback
- G10K 2210/3027: Feedforward
- H04R 2410/05: Noise reduction with a separate noise microphone
- H04R 2460/01: Hearing devices using active noise cancellation
- 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

The noise-canceling headphone includes a housing including a microphone collecting external noise and a speaker emitting a sound toward an opening of an external auditory canal of a user. The noise-canceling headphone generates a noise-canceling signal from a noise signal collected by the microphone, drives the speaker with the noise-canceling signal, and emits a noise-canceling sound having a phase opposite to that of the external noise. One microphone is provided outside a back cavity that is an acoustic space behind a diaphragm of the speaker in a housing, and a guide guiding the external noise to the microphone is provided in the housing.

## Claims

### Claim 1

A noise-canceling headphone comprising
a housing including a microphone collecting external noise and a speaker emitting a sound toward an opening of an external auditory canal of a user, the noise-canceling headphone generating a noise-canceling signal from a noise signal collected by the microphone, driving the speaker with the noise-canceling signal, and emitting a noise-canceling sound having a phase opposite to that of the external noise, wherein
one microphone is provided outside a back cavity that is an acoustic space behind a diaphragm of the speaker in the housing, and
a guide guiding the external noise to the microphone is provided in the housing.

### Claim 2 (depends on 1)

The noise-canceling headphone of claim 1, wherein
the guide is a slit circumferentially formed on a side surface of the housing extending along a traveling direction of the sound that is emitted from the speaker.

### Claim 3 (depends on 1)

The noise-canceling headphone of claim 1, wherein
the guide includes:
a plurality of noise collection holes formed in a side surface of the housing extending along a traveling direction of the sound that is emitted from the speaker; and
tubes guiding external noise from the respective sound collection holes to the microphone.

### Claim 4 (depends on 1)

The noise-canceling headphone of claim 1, wherein
the microphone is provided in a central portion of a cross section of the housing in a direction orthogonal to a traveling direction of the sound that is emitted from the speaker.

### Claim 5 (depends on 1)

The noise-canceling headphone of claim 1, wherein
the microphone is provided at a position offset, by 2.5 mm or less, from a central portion of a cross section of the housing in a direction orthogonal to a traveling direction of the sound that is emitted from the speaker.