Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With electrostatic microphone
Patent
1983-07-11
1985-04-02
Brown, Thomas W.
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
With electrostatic microphone
381 68, 381 69, 179107R, 179111E, H04M 103
Patent
active
045091935
ABSTRACT:
A battery-powered miniature acoustical transducer system for a hearing aid, including a microphone and an amplifier, has a combination filter and voltage regulator incorporated in its power supply circuit; the filter/regulator includes a field-effect transistor having its drain and source electrodes interposed in series between one battery terminal and a first power terminal of the amplifier, a resistor connecting the source and gate electrodes of the FET, a transistor having its emitter and collector interposed in series between the other power terminal of the amplifier and the gate electrode of the FET, and a junction diode connected from the FET source electrode to the transistor base, the diode junction and the base-emitter junction of the transistor both having highly non-linear voltage/current characteristics.
REFERENCES:
patent: 3300585 (1967-01-01), Reedyk et al.
patent: 3816671 (1974-06-01), Fraim
patent: 3862367 (1975-01-01), Kono
patent: 3875433 (1975-04-01), Uchikawa
patent: 3942029 (1976-03-01), Kawakami
patent: 4063050 (1977-12-01), Carlson
patent: 4068090 (1978-01-01), Komatsu
patent: 4207442 (1980-06-01), Freeman
Brown Thomas W.
Industrial Research Products, Inc.
Schroeder L. C.
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