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pp.287-290
Published Date 1952/7/20
DOI https://doi.org/10.11477/mf.1492200697

 ONCHI points out that in hearing tests various errors may inevitably enter into them, even when an audiometry is conducted in a sound proof room, unless the test is performed without masking the untested ear. The sourse of error lies chiefly in the differences of the two types of conduction losses namely, aero-cranial and cranial which are, as compared to air conduction threshold of the tested ear, approximately 50 db for the former and 5 db for the latter. The author derives a formula for a measured intensity of the masking noise with the use of which correct values may be obtained in measuremnets of degree of deafness in various clinical cases.


Copyright © 1952, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 印刷版ISSN 0386-9679 医学書院

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