摘要
本文研究了０．１ｍｓ脉冲噪声等能量暴露对豚鼠听力损伤问题。３７只白色雄性豚鼠，皮层听区埋植慢性电极，分为五个暴露组。各组分别暴露１６３ｄＢ１０发１／１０ｓ，１６３ｄＢ１０发１／９０ｓ，１６３ｄＢ１０发１／０．５ｓ，１６６ｄＢ５发１／９０ｓ和１７２ｄＢ１发的脉冲噪声。暴露２４小时、４８小时和８天后，分别测试各组动物皮层反应阈阈移。结果显示：（１）等能量暴露的五组平均阈移不同，有显著性差异。（２）按３ｄＢ法则，不同峰值和发数组合的脉冲噪声并不完全形成等同程度的听力损伤。（３）在等能量暴露中，重复率是影响听力损伤的重要参数，快和慢重复率暴露比中等重复率听力损伤相对较轻。
The validity of the equal energy hypothesis for impulse noise exposure was investigated. 37 albino guinea pigs,implanted with chronic electrodes,were divided into five groups. Each group was exposed to one of following impulse noise conditions, 163 dB SPL 10 impulses at 1/10s, 163 dB SPL 10 impulses at 1/90s, 163 dB SPL 10 impulses at 1/0.5s, 166 dB SPL 5 impulses at 1/90s and 172 dB SPL 1 impulse. The impulse noise had a duration of 0.1 ms. After exposure, threshold shifts were systematically measured at 24, 48h and 8 days respectively. The results were as follows: (1) There were significant differences in threshold shifts among these groups. (2) The 3dB doubling rule was not valid for all combinations of different peak levels and numbers of impulses. (3) The repitition rate was a critical variable which may affect the degree of hearing damage during equal energy exposure to impulse noise.
出处
《声学技术》
CSCD
1992年第3期24-28,共5页
Technical Acoustics
