Abstract
The acoutical effect is meaured by subjective as well as objective method.In the former, .the minimal audible thresholds of the subjects are meaured respectively by controlling the intensities of various pure tone sources, while they are turned around the subjects from front to side.In the latter, the variation of the sound pressure in the entrance of the external auditory canal are meas- ured by a probe tube microphone for various frequencies.The both results coincide well each other. In addition, the frequency characteristic of the external auditory canal is analyzed by measuring the ratio of sound pressure on the tympanic membrane to the sound pressure at the entrance of the external auditory canal and the ratio of sound pressure in the entrance of the external auditory canal to the sound pressure in the free-field.A new method of measurement of hearing acuity can be found from the results of the above mentioned experiments and it is also proved by additional several acoustical measurements to be more reasonable than any other method has been used.
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