Adjustable filter for differential microphones

Details Adjustable filter for differential microphones Adjustable filter for differential microphones

H - Electricity

04

R

H04R 3/00 (2006.01) H04R 1/38 (2006.01) H04R 3/08 (2006.01)

Patent

CA 2069356

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 distance between the microphone and a source of sound, and may comprise both a relative frequency response and absolute output level. The frequency response of the filter may comprise the substantial inverse of the frequency response of the microphone to provide a flat response. Furthermore, the filter may comprise a Butterworth filter.

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