Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent
1989-11-03
1992-07-14
Dwyer, James L.
Electrical audio signal processing systems and devices
Sound effects
Reverberators
381 68, 381 684, 330254, H04R 2500, H03F 345
Patent
active
051310465
ABSTRACT:
A high fidelity hearing aid amplifier is operable at a very low battery voltage and includes a single integrated circuit chip which provides a variable gain amplifier and gain control circuitry operative at low signal levels to enhance gain at higher frequencies relative to gain at lower frequencies, such circuitry including a logarithmic rectifier arrangement and a peak detector in a compression ratio control circuit. Operation at a low battery voltage is enhanced through a compression ratio control circuit which provides a level shift between an AC output of the logarithmic rectifier arrangement and the peak detector. Current mirrors are provided to obtained balanced and stable operation, and an arrangement is provided for manual control by a user to obtain an optimum response characteristic.
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Brown, Jr. Clyde M.
Cole William A.
Compton James B.
Iseberg Steven J.
Killion Mead C.
Chan Jason
Dwyer James L.
Etymotic Research Inc.
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