Variable recovery time circuit for use with wide dynamic range a

Details Variable recovery time circuit for use with wide dynamic range a Variable recovery time circuit for use with wide dynamic range a

1990-03-30

1992-09-01

Dwyer, James L.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

330254, 330284, 381 56, 381 68, 381 682, 381104, H04R 2500, H04R 2900, H03G 300, H03F 345

Patent

active

051446758

ABSTRACT:
A gain control voltage is applied to a control terminal of a variable gain hearing aid amplifier which is logarithmically related to a signal voltage level which is sensed at either an input terminal or an output terminal of the amplifier and which is below a certain threshold value, and an impedance is connected to the control terminal which includes, in parallel a first capacitor, a series combination of a resistor and a second capacitor of larger value than the first, the impedance being operative at signal levels below the threshold value to provide a rapid recovery from short intense sounds and a much slower recovery from prolonged intense sounds.

REFERENCES:
patent: 3229049 (1966-01-01), Goldberg
patent: 3714462 (1973-01-01), Blackmer
patent: 3789143 (1974-01-01), Blackmer
patent: 4088963 (1978-05-01), Machida et al.
patent: 4170720 (1979-10-01), Killion
patent: 4461025 (1984-07-01), Franklin
patent: 4718099 (1988-01-01), Hotvet
patent: 4759071 (1988-07-01), Heide
patent: 4823392 (1989-04-01), Walker
patent: 4882761 (1989-11-01), Waldhauer
patent: 4891837 (1990-01-01), Walker et al.
patent: 4928074 (1990-05-01), Sato et al.
Schilling and Belove, "Electronic Circuits Discrete and Integrated", 1979, Section 8.10-Automatic Gain Control.
Omni Hearing Systems, "Hearing Instrument Specifications", Dec. 1990, Model X312A.

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