Electronically variable audiometer of the von Bekesy type

Details Electronically variable audiometer of the von Bekesy type Electronically variable audiometer of the von Bekesy type

1973-11-28

1976-02-03

Claffy, Kathleen H.

Electricity: power supply or regulation systems

Remote sensing

323 74, H04R 2900

Patent

active

039366073

ABSTRACT:
The disclosure relates particularly to audiometers, such as used in ascertaining the hearing ability of test subjects. Functionally, the new audiometer is similar to the so-called von Bekesy audiometer. However, the new system incorporates unique and advantageous circuit arrangements which enable controlled variable attenuation of a power signal to be achieved through simple and reliable electronic means. The new system eliminates the costly and fast-wearing electro-mechanical mechanism customarily used and heretofore considered necessary in a von Bekesy audiometer. The new electronic attenuation system includes means, effective in the extremely low power range of audiometer signal generation, to apply a high level, controllably variable signal, and to attenuate that signal across a high ratio voltage divider. In the high power ranges of the audiometer, the generated signals need not be attenuated in the first instance, and the voltage divider is rendered ineffective automatically when the system operates in the higher ranges. A current amplifier supplies the necessary additional current requirements for high level signals.
The new system is unique in its ability to generate an extremely low power adiometer signal by electronic means while effectively obviating the problem of unfavorable noise-to-signal ratios in the low power ranges.

REFERENCES:
patent: 3796945 (1974-03-01), Feldman et al.

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