Hearing acuity at higher frequency range was investigated by using a tinnitus audiometer.
First, frequency and sound pressure level of the sound generated by the tinnitus audiometer wasmeasured. The measured frequency values were close to those indicated by the tinnitus audiometer.On the other hand, the measured sound pressure values were different from those indicated by thetinnitus audiometer. However, the measured intervals for the sound pressure levels were almost thesame as those for indicated by the tinnitus audiometer.
Secondly, hearing thresholds in 25 normal subjects were assessed. Mean and standard deviationfor subjects' age were 22.0 and 1.5 years, respectively. There was significant gender difference atfrequencies of 250, 9190, and 13929Hz and there was significant left and right difference at frequenciesof 10556, 12126, and 16000Hz. All tests were done from the right ear. In order to evaluatethe possible effect of order, retests were performed from left ear in two subjects at four monthsinterval. However there was no consistent tendency for order. In addition, retests were performedin two subjects from right ear. Mean and standard deviation for the difference between thresholdsfor the first test and the second test were 4.7 and 4.0dBs, respectively.
It is presumably said from our results that the high frequency audiometry above conventionalfrequency ranges is difficult to be evaluated but useful in some cases.
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