著者

倉本 和興 老松 建成 桑原 信也 山口 静馬

出版者

特定非営利活動法人 海洋音響学会

雑誌

海洋音響学会誌 (ISSN:09165835)

巻号頁・発行日

vol.31, no.2, pp.81-85, 2004-04-01 (Released:2011-03-02)

参考文献数

9

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In order to examine the effects of air bubble in the ear canal for underwater hearing, detailed measurement of minimum audible field (MAF) in audio frequency (50Hz-8kHz) and comparison of loudness were carried out at two conditions as below, 1) the air bubble remains in the ear canal and 2) the ear canal is filled with water. As the result, in the high frequency region over about 300 Hz, it is highly sensitive to hearing in the case that the air bubble remained in the ear canal. In the low frequency region under 300 Hz, it becomes more sensitive in the case that the ear canal was filled with the water by removing the air bubble.The reverse phenomenon of “hearing” at about 300 Hz is explained by difference between frequency characteristics of the occlusion effect (air conduction) and the effect in which the ear canal was filled with the water (bone conduction).

著者

倉本 和興

出版者

一般社団法人 電子情報通信学会

雑誌

電子情報通信学会 通信ソサイエティマガジン (ISSN:21860661)

巻号頁・発行日

vol.13, no.4, pp.250-251, 2020 (Released:2020-03-01)

参考文献数

3

著者

山口 静馬 倉本 和興 桑原 信也 老松 建成

出版者

特定非営利活動法人 海洋音響学会

雑誌

海洋音響学会誌 (ISSN:09165835)

巻号頁・発行日

vol.18, no.4, pp.209-212, 1991 (Released:2011-03-02)

参考文献数

9

著者

倉本 和興 田中 隆博

出版者

海上保安大学校

雑誌

海上保安大学校研究報告. Part 2, 理工学系 = Report of Japan Coast Guard Academy. 海上保安大学校 編 (ISSN:02872951)

巻号頁・発行日

vol.58, no.1, pp.1-8, 2014

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In the previous report,we proposed a new measuring technique that the number of pulses per unit time was counted by using the general-purpose image processing software after acquiring 16-bit grayscale square image from the temporal acoustic data,as an evaluation method of the number of peculiar cracking noise,whith is called "TEMPURA noise". In addition,we measured the underwater acoustic data with the marine environment at KOJIMA pier of Japan Coast Guard Academy in the every hour for 25 hours in one day of each season and discussed the relationship between the number of pulses and the marine environment value. In this study, the automatic measurement device of the underwater acoustic data and marine environment value was constructed in order to carry out the continuous measurement throughout for a few days. The consecutive measurements for 4 days(for 77 hours)of each season in winter,spring,summer,autumn were carried out in the fixed point at KOJIMA pier,and the relationship between the changes of pulse generation of snapping shrimp and marine environment values is reconsidered.