Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate
2006-10-17
2006-10-17
Pendleton, Brian T. (Department: 2644)
Electrical audio signal processing systems and devices
Directive circuits for microphones
Reexamination Certificate
active
07123727
ABSTRACT:
A method and apparatus for providing a differential microphone with a desired frequency response are disclosed. The desired frequency response is provided by operation of a filter, having an adjustable frequency response, coupled to the microphone. The frequency response of the filter is set by operation of a controller, also coupled to the microphone, based on signals received from the microphone. The desired frequency response may be determined based upon the orientation angle and the distance between the microphone and a source of sound. The frequency response of the filter may comprise the substantial inverse of the frequency response of the microphone to provide a flat response. In a preferred embodiment, the gain of the differential microphone is adjusted so that the output level is effectively independent of microphone position relative to the source. In particular embodiments, the controller may determine, based on the distance from the sound source, whether to operate the differential microphone in a nearfield mode of operation or a farfield mode of operation.
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Elko Gary W.
Teutsch Heinz
Agere Systems Inc.
Pendleton Brian T.
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