Changes in bone conduction thresholds with vibrator contact area

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Abstract
An experimental bone conduction vibrator was used to measure force and acceleration directly at the point of contact, the [human] subject''s forehead. Force and acceleration at threshold were measured for 6 subjects over a frequency range of 250-6000 Hz and over a contact area range of 5-1. Apparently, for any test subject, the variation in force of threshold with contact area is much smaller than the corresponding variation in acceleration at threshold.

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