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Research Article

Identification of frequency determining sound generating organ of cicadas with the Helmholtz resonator structure

헬름홀쯔 공명기 구조 매미 소리의 주파수 결정 발음기관 규명

Ki-sang Yoon1∗
,
Se-hyun Cho1
,
Yoon-sang Jung1
,
Dong-hyun Lee1
윤 기상1∗
,
조 세현1
,
정 윤상1
,
이 동현1
1세종과학예술영재학교
∗Corresponding Author
30 September 2018. pp. 276-283
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Abstract

The purpose of the study is to identify a sound generating organ that has a major influence on the central frequency of the cicadas with the Helmholtz resonator structure for the first time. The sound of cicadas Cryptotympana atrata and Hyalessa fuscata were recorded and analyzed, then the motion of the tymbals was analyzed with a high-speed camera to compare the relationship between the frequency of sound and the motion of the tymbals. As a result, there was little difference in the frequency distribution of calling song and scream for two species. The tymbals of C. atrata oscillated in three vibration modes, while those of H. fuscata oscillated in one mode. There was no difference in the frequency of both tymbals of both cicadas, and three vibration modes of C. atrata generated sound with different frequency bands. The frequency band of tymbals and the central frequency band of calling song were very similar. In conclusion, it is presumed that the frequency of the cicadas with the Helmholtz resonator structure was determined by mode frequency of the tymbals than resonance condition of the abdomen.

Keywords
Helmholtz
Cicada
Frequency
Sound generating organ
High-speed image

이 연구는 헬름홀쯔 공명기 구조를 갖는 매미 소리의 중심주파수에 주요 영향을 주는 발음기관이 무엇인지를 최초로 초고속영상분석을 통해 규명하는 데 목적이 있다. 말매미와 참매미를 대상으로 소리를 녹음 후 분석하였고, 초고속카메라로 촬영한 진동막의 움직임을 분석하여 소리의 주파수와 진동막 운동 사이의 관계를 비교하였다. 연구결과, 말매미와 참매미 모두 유인음과 비명음의 주파수분포에는 차이가 거의 없었으며, 말매미의 진동막은 3개, 참매미의 진동막은 1개 모드로 진동하였다. 두 매미 모두 양쪽 진동막의 진동수에는 차이가 나타나지 않았으며, 말매미의 진동막의 3개 진동 모드는 서로 다른 진동수 대역의 소리가 발생하였다. 두 매미 모두 진동막의 진동수 대역과 유인음의 중심주파수 대역이 매우 유사하였다. 결론적으로, 헬름홀쯔 공명기 구조를 갖는 매미 소리의 주파수는 복부의 공명조건보다는 진동막의 모드별 진동수에 의해 결정되는 것으로 추정된다.

키워드
헬름홀쯔
매미
진동수
발음기관
초고속영상
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 37
  • No :5
  • Pages :276-283
  • Received Date : 2018-06-08
  • Revised Date : 2018-07-03
  • Accepted Date : 2018-09-17
  • DOI :https://doi.org/10.7776/ASK.2018.37.5.276
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