Trimmable variable compression amplifier for hearing aid

Details Trimmable variable compression amplifier for hearing aid Trimmable variable compression amplifier for hearing aid

1995-10-19

1998-11-17

Le, Huyen

Electrical audio signal processing systems and devices

Hearing aids, electrical

Wideband gain control

381312, 381106, H04R 2500

Patent

active

058388079

ABSTRACT:
An improved analog hearing aid is provided which incorporates a current source transconductance amplifier as an input stage. The gain defining bias current of the input stage transconductance amplifier is adjusted upon the application of battery power to the hearing aid to define a low input signal gain, and is then reduced by two gain regulators to define a compression threshold and compression ratio, and to provide a maximum output ceiling. Also provided is a method of trimming the low signal gain of the hearing aid at the time battery power is applied.

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