# US 2010/0166195 A1 · Acoustic apparatus

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- Number: US 2010/0166195 A1
- Document ID: US20100166195A1
- Status: Published application
- Kind: A1
- Application number: 12/663,220
- Filed: 2008-05-28
- Published: 2010-07-01
- Earliest claimed: 2007-06-04
- Assignees: Yamaha Corporation
- Inventors: Satoshi Ukai; Ryo Tanaka; Toshiaki Ishibashi
- Web page: https://patentgrep.com/patent/US20100166195A1

## CPC

- H04R 3/005: {for combining the signals of two or more microphones (specially adapted for hearing aids H04R25/407)}
- H04R 1/406: {microphones}
- H04R 2201/401: 2D or 3D arrays of transducers
- H04R 2201/403: Linear arrays of transducers
- H04R 2430/23: Direction finding using a sum-delay beam-former
- 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

An acoustic apparatus without increasing noise etc. even when plural directional microphones collect sounds from a place of the same distances is provided. Sound signals output from the microphone arrays are subjected to phase shift by phase shift circuits 211A to 211H, and the sound signals are combined by an adder 212, The phase shift circuits 211A to 211H performs phase shifts according to installation positions of the microphone arrays. The phase shift circuit 211A makes the shift 0 degree, the phase shift circuit 211B makes the shift 45 degrees, the phase shift circuit 211C makes the shift 90 degrees, and sequentially to the phase shift circuit 211H, the shifts are made according to rotational angles.

## Claims

### Claim 1

An acoustic apparatus, comprising:
a plurality of sound collection sections arranged on a circumference around one axis, wherein sound collection directions of the sound collection sections are set toward normal directions of the circumference in a plane orthogonal to the axis; and
a sound signal processing section that delays a phase of a sound signal output from each of the sound collection sections by an angle on the circumference at an installation position of each of the sound collection sections and combines the sound signals.

### Claim 2 (depends on 1)

The acoustic apparatus according to claim 1, wherein each of the sound collection sections includes a microphone array in which a plurality of microphone units are arranged, and a delay processing portion which delays and combines sound signals collected by the microphone units to provide directivity for the sound collection section.

### Claim 3 (depends on 1)

The acoustic apparatus according to claim 1, further comprising a speaker in which a sound emission direction is set in an extending direction of the axis.

### Claim 4 (depends on 3)

The acoustic apparatus according to claim 3, further comprising an adaptive echo canceller that subtracts a pseudo feedback signal in which a sound signal input to the speaker is filtered from an output signal of the sound signal processing section to output a signal.