Loudness contour compensated hearing aid having ganged volume, b

Details Loudness contour compensated hearing aid having ganged volume, b Loudness contour compensated hearing aid having ganged volume, b

1977-09-06

1978-10-03

Stellar, George G.

H04R 2500

Patent

active

041186044

ABSTRACT:
A hearing aid apparatus employs a network which varies the frequency response of the aid according to the listening level or the intensity of the audio signal propagating in the environment. A volume controlled amplifier is adjusted by the user via a potentiometer, variation of the potentiometer by the user specifies the center frequency of an active bandpass filter by controlling the impedance of associated FET devices. One FET also serves to vary the compression ratio according to the setting of the potentiometer or volume control to thus enable the user to receive a processed signal which is compensated according to his particular loudness contours.

REFERENCES:
patent: 3764745 (1973-10-01), Bottcher et al.

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