Hearing-aid with integrated circuit electronics

Electricity: power supply or regulation systems – Remote sensing

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179107E, 323223, H04R 300

Patent

active

045394415

ABSTRACT:
A hearing-aid has an electronic voltage stabilizing circuit (16) to compensate for change in supply voltage due to battery (18) aging and use. The electret microphone (11) is located within a housing, the voltage stabilizing circuit (16) being located within the same microphone housing, thus requiring no additional space or terminal connections. Preferably, an impedance transformer is provided; the electronic components (31-34) are placed on the same semi-conductor chip as the components (35, 36) of the voltage stabilizing circuit.

REFERENCES:
patent: 3939396 (1976-02-01), Larson
patent: 4068090 (1978-01-01), Komatsu
patent: 4117275 (1978-09-01), Miyanaga
patent: 4268725 (1981-05-01), Nakagawa
patent: 4281222 (1981-07-01), Nakagawa
patent: 4385209 (1983-05-01), Greason
"The ELZ Electret Transmitter," Bell System Tech. Journal, vol. 58, No. 7, Sep. 1979.
Bosch Publication No. 6 DRC.

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