发明名称 |
Adjustable filter for differential microphones |
摘要 |
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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申请公布号 |
US5303307(A) |
申请公布日期 |
1994.04.12 |
申请号 |
US19930035551 |
申请日期 |
1993.03.23 |
申请人 |
AT&T BELL LABORATORIES |
发明人 |
ELKO, GARY W.;KUBLI, ROBERT A.;MORGAN, DENNIS R.;WEST, JAMES E. |
分类号 |
G01S3/803;H04R1/38;H04R3/00;H04R3/08;(IPC1-7):H04R3/00 |
主分类号 |
G01S3/803 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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