Patent
1975-05-15
1977-07-26
Claffy, Kathleen H.
H04R 2900
Patent
active
040384969
ABSTRACT:
A portable precision automatic audiometer for testing hearing of an individual utilizes a voltage programmable oscillator in combination with a preprogrammed logic circuit to generate and transmit sweep frequency tones automatically or fixed frequency tones under manual control into a suitable earphone worn by the individual examinee being tested. A voltage proportional attenuator is controlled by an examinee manually operated switch and enables the examinee being tested to regulate the level of sound pressure to which he is being exposed, while a chart recording instrument simultaneously graphs the audiogram of his test responses. Improvements are provided with respect to noise reduction and ease of calibration. Features of the invention include the elimination of sources of mechanical noise, the employment of a programmed logic controlled voltage source for the oscillator to provide a sweep frequency mode of operation, the employment of a noise source to mask the ear not being tested and a switching arrangement which allows the noise source to be switched from ear-to-ear in correspondence with the test procedure.
REFERENCES:
patent: 2563384 (1951-08-01), Von Bekesy
patent: 3673328 (1972-06-01), Grason et al.
patent: 3793484 (1974-02-01), Feezor et al.
patent: 3808354 (1974-04-01), Feezor
patent: 3809811 (1975-05-01), Delisle et al.
patent: 3905131 (1975-09-01), Feezor et al.
Audiometric Teleprocessing, Inc.
Claffy Kathleen H.
Kemeny E. S.
Olive B. B.
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