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2012 Vol.31, Issue 8 Preview Page
Extraction of an Underwater Transient Signal Using Sound Mask-filter

사운드 마스크 필터를 이용한 수중 과도 신호 추출

Tae-Hoon Bok1
,
Juho Kim1
,
Dong-Guk Paeng1
,
Chong Hyun Lee1
,
Jinho Bae1*
,
Seongil Kim2
복 태훈1
,
김 주호1
,
팽 동국1
,
이 종현1
,
배 진호1*
,
김 성일2
1제주대학교 해양시스템공학과
2국방과학연구소 제6기술연구본부
*Corresponding Author
30 November 2012. pp. 532-541
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Abstract

An underwater transient signal is distinguished from an ambient noise. Database for the underwater transient signal is required since the underwater transient signal shows various characteristics depending on acoustic features. In the paper, hence, sound mask-filter was applied to extract the transient signals which exist temporally and locally in the ocean. The standard signal was chosen and cross-correlated with the raw signal. A mask-filter for a transient signal was obtained using the threshold which was decided by the maximum likelihood method in the envelope of the cross-correlated signal. Using the sound mask-filter, the transient signal of a sea catfish {Galeichthys felis (Linnaeus)} was extracted from the underwater ambient noise. Similarly, the man-made signal was added into the noise and it was extracted by the same method. We also have demonstrated the significance of the transient signal through comparing the extracted signals depending on the standard signal. In the results, the proposed method, sound mask-filtering, could be utilized as a database construction of the transient signals in underwater noise. Particularly, this study would be useful to extract the wanted signal from arbitrary signals.

Keywords
Transient signal
Underwater ambient noise
Sound mask-filter
Maximum likelihood

수중 과도 신호는 주변 소음과는 구별된다. 과도 신호는 음향학적 특색에 따라 특징들이 다양하기 때문에 데이터베이스화가 요구된다. 이에 본 논문에서는 해양에서 국지적이고 일시적으로 존재하는 과도 신호를 추출하기 위해 사운드 마스크 필터링 방법을 활용하였다. 표준 신호를 선택하여 원 음원과의 상호상관관계를 구하였다. 상호상관신호의 포락선에서 최대우도법에 의해 결정된 역치를 사용하여 과도 신호를 위한 사운드 마스크 필터를 구하였다. 사운드 마스크 필터를 활용하여, 수중 소음원에서 바다메기의 과도 신호를 추출하였다. 유사하게, 원 음원에 인위적으로 인공 신호를 추가한 신호에서 동일한 방식으로 바다메기와 인공 신호를 과도 신호로서 추출하였다. 또한 표준신호에 따라서 다르게 추출된 과도신호의 비교를 통해 표준신호 선택의 중요함을 제시하였다. 본 논문에서 제안된 사운드 마스크 필터링 방법은 해양 주변 소음원에서 과도 신호의 데이터베이스 구축에 활용될 수 있고, 특히, 임의의 신호에서 원하는 신호를 추출하는 데에 활용 가능성이 있다.

키워드
과도 신호
해양 주변 소음
사운드 마스크 필터
최대우도법
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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 : 31
  • No :8
  • Pages :532-541
  • Received Date : 2012-06-15
  • Revised Date : 2012-08-22
  • Accepted Date : 2012-09-14
  • DOI :https://doi.org/10.7776/ASK.2012.31.8.532
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