发明名称 |
Frequency selection circuit for hearing aids |
摘要 |
A signal processing circuit for hearing aids includes a broadband peak detector for generating a control voltage based upon the sound pressure level of an incoming acoustical signal over its entire frequency spectrum. The control signal is used to determine the cut-off frequency of a voltage controlled adaptive high-pass filter. An amplified electrical signal, corresponding to the acoustical signal, also is provided to the high-pass filter. In setting the cut-off frequency, the control voltage causes the high-pass filter to selectively suppress the low frequency portion of the signal, generating a modified signal in which the noise component is reduced.
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申请公布号 |
US4790018(A) |
申请公布日期 |
1988.12.06 |
申请号 |
US19870013376 |
申请日期 |
1987.02.11 |
申请人 |
ARGOSY ELECTRONICS |
发明人 |
PREVES, DAVID A.;JOHNSON, WILLIAM A. |
分类号 |
H04R3/04;H04R25/00;(IPC1-7):H04R25/00;H04R3/00;H03G3/00;H03G5/00 |
主分类号 |
H04R3/04 |
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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