# US 2020/0288239 A1 · Signal processing device and signal processing method

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- Number: US 2020/0288239 A1
- Document ID: US20200288239A1
- Status: Published application
- Kind: A1
- Application number: 16/806,190
- Filed: 2020-03-02
- Published: 2020-09-10
- Earliest claimed: 2019-03-06
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Shinichi YUZURIHA
- Web page: https://patentgrep.com/patent/US20200288239A1

## CPC

- G10L 21/0216: characterised by the method used for estimating noise
- H04R 3/005: {for combining the signals of two or more microphones (specially adapted for hearing aids H04R25/407)}
- B60R 11/0247: {for microphones or earphones}
- H04R 3/04: for correcting frequency response
- H04R 5/027: Spatial or constructional arrangements of microphones, e.g. in dummy heads
- H04R 5/04: Circuit arrangements, {e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments (combinations of amplifiers H03F3/68; stereophonic systems H04S)}
- G10L 2021/02165: {Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal}
- H04R 2410/05: Noise reduction with a separate noise microphone
- H04R 2499/13: Acoustic transducers and sound field adaptation in vehicles
- G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- 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)
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR

## Abstract

Included are a first obtainer which obtains a first signal output from a first microphone, a second obtainer which obtains a second signal output from a second microphone installed in a position different from a position where first microphone is installed, a delayer which delays the second signal, a mixed sounds estimator which estimates noises mixed in the first signal on the basis of the second signal delayed by the delayer, and an eraser which erases the noises from the first signal, the noises being estimated by the mixed sounds estimator.

## Claims

### Claim 1

A signal processing device, comprising:
a first obtainer which obtains a first signal output from a first microphone;
a second obtainer which obtains a second signal output from a second microphone installed in a position different from a position where the first microphone is installed;
a delayer which delays the second signal;
a mixed sounds estimator which estimates noises mixed in the first signal on a basis of the second signal delayed by the delayer; and
an eraser which erases the noises from the first signal, the noises being estimated by the mixed sounds estimator.

### Claim 2 (depends on 1)

The signal processing device according to claim 1,
wherein the delayer delays the second signal by a time determined on a basis of a positional relation between the first microphone and the second microphone.

### Claim 3 (depends on 1)

The signal processing device according to claim 1,
wherein the delayer delays the second signal on a basis of a frequency component included in the second signal.

### Claim 4

A signal processing method, comprising:
obtaining a first signal output from a first microphone;
obtaining a second signal output from a second microphone installed in a position different from a position where the first microphone is installed;
delaying the second signal;
estimating noises mixed in the first signal on a basis of the second signal delayed by the delaying; and
erasing the noises from the first signal, the noises being estimated in the estimating.