RATE OF AMPLITUDE CHANGE CONTROL FOR AUDIOMETERS OF THE VON BEKESY TYPE

摘要

The rate of amplitude change control disclosed herein is adapted for use in an audiometer of the von Bekesy type in which the subject being tested controls the sense or direction of variation in test-tone amplitude, the amplitude level around which the subject hunts at each test-tone frequency being an accurate indication of the threshold of the subject's hearing at that frequency. The control of the present invention causes the rate of change of amplitude to itself vary from a relatively high rate to a relatively low rate as a test sequence progresses. In this way, a substantial amplitude range can be scanned in a short period until the subject's threshold is first reached and then a slower rate enables the final hunting procedure to proceed gradually and therefore relatively accurately.