Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent
1987-02-11
1988-12-06
Ng, Jin F.
Electrical audio signal processing systems and devices
Sound effects
Reverberators
381 68, 381 684, 381 98, 381101, H04R 2500, H04R 300, H03G 300, H03G 500
Patent
active
047900180
ABSTRACT:
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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Johnson William A.
Preves David A.
Argosy Electronics
Byrd Danita R.
Haugen Orrin M.
Ng Jin F.
Niebuhr Frederick W.
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