Microphone apparatus

Details Microphone apparatus Microphone apparatus

2011-08-02

2011-08-02

Faulk, Devona E (Department: 2614)

Electrical audio signal processing systems and devices

Directive circuits for microphones

C381S122000, C381S091000, C381S111000, C704S200000, C704S201000, C704S231000

Reexamination Certificate

active

07991166

ABSTRACT:
A microphone apparatus for processing and outputting an output signal of a microphone array including at least nine microphones includes a directivity function processing circuit that converts the output signal of the microphone array into a unidirectional signal and that outputs the unidirectional signal. The directivity function processing circuit expands a directivity function whose variable is an incident angle of an acoustic wave into a Fourier series up to at least third order. The variable in the expanded expression is produced from output signals of the microphones forming the microphone array.

REFERENCES:
patent: 4653606 (1987-03-01), Flanagan
patent: 5335011 (1994-08-01), Addeo et al.
patent: 2001-231089 (2001-08-01), None
patent: 2001231089 (2001-08-01), None
patent: 2002-271885 (2002-09-01), None
patent: 2002271885 (2002-09-01), None

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