# US 2014/0192998 A1 · Advanced speech encoding dual microphone configuration (dmc)

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- Number: US 2014/0192998 A1
- Document ID: US20140192998A1
- Status: Published application
- Kind: A1
- Application number: 14/149,805
- Filed: 2014-01-07
- Published: 2014-07-10
- Earliest claimed: 2007-05-23
- Assignees: AliphCom
- Inventors: Gregory C. Burnett
- Web page: https://patentgrep.com/patent/US20140192998A1

## CPC

- H04R 3/005: {for combining the signals of two or more microphones (specially adapted for hearing aids H04R25/407)}
- G10L 21/0208: Noise filtering
- 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: 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)
- G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING

## Abstract

A microphone array is described for use in ultra-high acoustical noise environments. The microphone array includes two directional close-talk microphones. The two microphones are separated by a short distance so that one microphone picks up more speech than the other. The microphone array can be used along with an adaptive noise removal program to remove a significant portion of noise from a speech signal of interest.

## Claims

### Claim 1

A device comprising:
a boom having two receptacles that define an axis;
a first directional microphone, the first directional microphone having a first vector normal to a first front of the first directional microphone, the first vector approximately parallel with the axis, and a first of the two receptacles configured to receive and hold the first directional microphone;
a second directional microphone positioned on the axis a first distance from the first directional micro, the second directional microphone having a second vector normal to a second front of the second directional microphone, and a second of the two receptacles configured to receive and hold the second directional microphone, wherein the second vector forms an angle relative to the first vector;
a vent positioned in proximity to the first directional microphone, the second directional microphone, or both, the vent having a first diameter that is less than a diameter of the first and second directional microphones; and
logic configured to determine whether the first directional microphone or the second directional microphone is closer to a source of speech.