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December 1976

Input-Voltage Method of Bone-Conduction Calibration

Author Affiliations

From the George A. Zeller Mental Health Center, Peoria, Ill (Dr Meissner), and the Department of Communication Disorders, Northern Illinois University, DeKalb (Dr Lankford).

Arch Otolaryngol. 1976;102(12):735-736. doi:10.1001/archotol.1976.00780170053007

• Several methods have been proposed for calibrating the bone-conduction section of an audiometer. Because of its low cost and ease of implementation, the input-voltage method is attractive. Only one previous investigation has assessed this calibration method and found it to be lacking. With the availability of updated "required voltages," a reexamination of this calibration method was warranted.

Audiometric corrections were determined for 21 combinations of audiometers and bone vibrators at five test frequencies with an artificial-mastoid system. These corrections were compared with those determined with the input-voltage method. The latter yielded corrections that agreed directly with or deviated no more than 5 dB from artificial-mastoid corrections 93.4% of the time and deviated by 10 dB only 6.6% of the time. The use of the input-voltage method for clinical calibration is advocated in the absence of an artificial mastoid.

(Arch Otolaryngol 102:735-736, 1976)

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