대한의용생체공학회:의공학회지 (Journal of Biomedical Engineering Research)

  • 제34권4호
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  • Pages.204-211
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  • 2013
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  • 1229-0807(pISSN)
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  • 2288-9396(eISSN)
대한의용생체공학회 (The Korean Society of Medical and Biological Engineering)
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디지털 청진기를 위한 잡음 제거 기술 개발 및 구현

Development and Implementation of Noise-Canceling Technology for Digital Stethoscope

  • 이근상 (연세대학교 컴퓨터정보통신공학부) ;
  • 지유나 (연세대학교 컴퓨터정보통신공학부) ;
  • 전영택 ((주) 시그젠) ;
  • 박영철 (연세대학교 컴퓨터정보통신공학부)
  • 투고 : 2013.09.24
  • 심사 : 2013.11.07
  • 발행 : 2013.12.31
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초록

In this paper, an algorithm for suppressing acoustic noises contained in stethoscope sound is proposed and implemented in real-time using an embedded DSP system. Sound collected by stethoscope is down-sampled and band-pass filtered, and later an NLMS adaptive filter is used to cancel the acoustic noise induced from external noise sources. Also, the unpredictable impulsive noises due to fabric friction and instantaneous tapping are detected using the SD-ROM algorithm, and suppressed using an algorithm approximating the morphology filter. The proposed algorithm was tested using signals collected with a digital stethoscope mockup, and implemented on an ARM920T-based DSP system.

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참고문헌

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