Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Patent
1982-01-27
1984-06-26
Pitts, Harold I.
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
179107FD, 381 68, 381 69, H04R 2502
Patent
active
044567952
ABSTRACT:
A behind-the-ear type hearing aid which includes a main body adapted to hang on the user's earlobe on the rear side, an opening disposed at the front end of the main body to communicate with a microphone used for normal conversation, and a pair openings disposed on its rear end portion to communicate with a closed talking microphone for use with telephone conversations disposed in the main body. The close talking microphone may be connected to a low-pass filter with a cutoff frequency of about 1,000 hertz. The close talking microphone may also include two pressure type microphones which are substantially identical in sensitivity and are disposed adjacent to each other. One of those microphones has an output connected to that of the other microphone through a phase inverter with or without a gain control connected across the phase inverter.
REFERENCES:
patent: 3458668 (1969-07-01), Hassler
patent: 3491214 (1970-01-01), Rosemond
patent: 3748390 (1974-03-01), Gage
patent: 3749853 (1974-08-01), Ely
patent: 3875349 (1975-04-01), Ruegg
patent: 3946168 (1976-03-01), Preves
patent: 4142072 (1979-02-01), Berland
Wayne J. Staab, "Hearing Aid Handbook", p. 55, published as Tab Books No. 987, in 1978.
"Amplification for the Hearing-Impaired", 2nd ed., pp. 32 and 34, edited by Michael C. Pollack and published in 1980 by Grune & Stratton, Inc., New York, N.Y.
Hallowell Davis and S. Richard Silverman, "Hearing and Deafness", 4th ed., p. 314, published in 1978 by Holt, Rinehart and Winston.
Pitts Harold I.
Rion Kabushiki Kaisha
Schroeder L. C.
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