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KMID : 1137820130340040204
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의공학회지
2013 Volume.34 No. 4 p.204 ~ p.211
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Development and Implementation of Noise-Canceling Technology for Digital Stethoscope
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Lee Keun-Sang
Ji You-Na
Jeon Young-Taek
Park Young-Chool
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Abstract
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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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KEYWORD
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Digital Stethoscope, Noise Cancellation, Adaptive Filter, Impulsive Noise Detection, Impulsive Noise Cancellation, Real-Time System
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