噪音對人體聽覺影響之實驗研究

dc.contributor.author王老得zh_tw
dc.date.accessioned2014-10-27T15:25:37Z
dc.date.available2014-10-27T15:25:37Z
dc.date.issued1983-06-??zh_TW
dc.description.abstractAn experimental study on the noise-induced hearing loss or noise-induced temporary threshold shift (NITTS) of the normal hearing college students (30 male and 30 female) was performed with three kinds of narrow band noise, including 250Hz, 1 KHz and 4KHz octave bands, and six different sound pressure levels of broad band noise, which were used white noise at sound pressure levels of 65, 70, 75, 80, 85 and 90 dB as stimulating tones.The mean age of this study subjects was 21.28 years in male group and 21.8 years in female group. First of all, all subject were measured with their hearing levels by using Rion AA39 audiometer, and then the persons with less 15 dB in average hearing level of speech range (500Hz, 1KHz, and 2KHz) were selected as the normal hearing subjects. The actual mean values were 9.55 dB in male group and 9.83 dB in female group.Two minutes after exposure to each stimulating noise ceased, the subject was retested with the hearing levels on 4KHz and 6KHz, and then compared with that of preexposure to the stimulating noise. If the difference of value between pre-and post-exposure hearing level on 4KHz or 6KHz shows 5 dB or greater, it is defined as a positive response of NITTS.The inciaence of positive TTS2 shows 65% among 60 subjects after 50 seconds of exposure to the broad band noise; and 3.3%, 16.7%, 30% after 50 seconds of exposure at 70 dB SPL to the 250Hz, 1KHz, 4KHz octave-band noises respectively.According to Reed-Muench bioassay method, LD50 value shows 80.99 dB SPL for the white noise exposure, In other words, 50% of subjects in this study group reveals positive TTS2 after exposure for 50 seconds to white noise at 80.99 dB sound pressure level.So the 81 dB SPL of the white noise may be referred to as the risk-criterion limit of "Noise Control Administration in Taiwan" for the broad band noise. If the environmental noise contains the 4KHz or higher pure-tone components and/or high octave bands, the risk-criterion limit must be decreased reasoen_US
dc.identifierB00329EF-8269-33C4-368F-660C3FC324D8zh_TW
dc.identifier.urihttp://rportal.lib.ntnu.edu.tw/handle/20.500.12235/17548
dc.language中文zh_TW
dc.publisher國立臺灣師範大學研究發展處zh_tw
dc.publisherOffice of Research and Developmenten_US
dc.relation(28),1-17zh_TW
dc.relation.ispartof師大學報zh_tw
dc.subject.other人體zh_tw
dc.subject.other研究zh_tw
dc.subject.other實驗zh_tw
dc.subject.other影響zh_tw
dc.subject.other噪音zh_tw
dc.subject.other聽覺zh_tw
dc.title噪音對人體聽覺影響之實驗研究zh-tw
dc.title.alternativeAn Experimental Study of Human Auditory Effect of Noisezh_tw

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