Hearing aid with adjustable frequency response

Details Hearing aid with adjustable frequency response Hearing aid with adjustable frequency response

1977-12-02

1978-10-10

Stellar, George G.

H04R 2500

Patent

active

041198140

ABSTRACT:
In the illustrated embodiments, a transistor amplifier stage has filter components in its input circuit providing a 12 dB/octave rise in response above a selected frequency. A bridging circuit of variable resistance may be provided for introducing a desired degree of low frequency response. A continuously controlled or switched transistor circuit may modify the resistance values in a base-emitter circuit and in a base-collector circuit of the filter network simultaneously to increase the cut-off frequency while retaining the 12 dB/octave rate of rise in response. Both the low frequency response in the attenuation range and the cut-off for the high frequency response range may be adjustable in the same amplifier stage, or a quantized selection of successive cut-off frequencies is feasible using e.g. a plurality of amplifier stages in cascade.

REFERENCES:
patent: 3015704 (1962-01-01), Behymer

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