Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate
2000-03-02
2008-12-02
Mei, Xu (Department: 2615)
Electrical audio signal processing systems and devices
Directive circuits for microphones
C381S091000, C381S122000
Reexamination Certificate
active
07460677
ABSTRACT:
A directional microphone array system generally for hearing aid applications is disclosed. The system may employ a broadside or an endfire array of microphones. In either case, the signals generated by the microphone are added using a plurality of summation points that are connected together via a single signal wire or channel. In the case of the endfire array, all but one of the signals is delayed so that the summation of the signals are in phase. The summation of the signals is then used to generate an output signal for a speaker of a hearing aid or the like.
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“Improvement of Speech Intelligibility in Noise: Development and Evaluation of a New Directional Hearing Instrument Based on Array Technology” Ph.D. Thesis, Delft University of Technology, Delft, The Netherlands, 1990.
“Etymotic Research—D-MIC 2NDOrder Directional Progress: As of Apr. 27, 1994”.
Horsten Roland
Matzen Norman P.
Schulein Robert B.
Soede Willem
Etymotic Research Inc.
McAndrews Held & Malloy Ltd.
Mei Xu
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