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March 1967

Artificial Mastoid Calibration of Bone Vibrators

Arch Otolaryngol. 1967;85(3):314-318. doi:10.1001/archotol.1967.00760040316014

THE CALIBRATION of the bone conduction system of an audiometer has been a problem to the clinical audiologist for years. The basis for this problem has been the lack of a reliable instrument for measuring the output of the bone vibrator. In lieu of such a device, empirical methods have been proposed for the calibration of the audiometer bone-conduction system. Beranek1 suggested a loudness balance procedure. However, such procedures are fraught with the problem of masking one ear so only the test ear will respond to the bone conducted stimulus and the need to remove the earphone from the test ear in order to avoid the occlusion effect for frequencies of 1,000 cycles per second and lower when the bone vibrator delivers the comparison tone. Furthermore, loudness balancing is not an easy task, particularly if there is a silent interval between the two stimuli to be compared, as would

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