25 Removal of the fricative sounds that occur in the electronic stethoscope

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1 25 Removal of the fricative sounds that occur in the electronic stethoscope

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3 Abstract Removal of the fricative sounds that occur in the electronic stethoscope Nobuki ODA Electronic stethoscopes with a sound recording function have come to be used through the digitization of electronic equipment. Unlike the traditional stethoscope, the electronic stethoscope has functions that reduces ambient noise and amplify the frequency components in order to hear easily to the heart sound and the breath sound. However, the electronic stethoscope can not be removed the fricative sound that occurs when the stethoscope and the skin are rubbed. Therefore, auscultatory sound that is recorded fricative sound is difficult to diagnose the fricative sound or the abnormal breath sound. In consequence, the auscultatory sound is necessary to remove the fricative sound, in order to diagnose correctly. In this paper, I have proposed the system that estimate the fricative sound generation position, using the simple perceptron which is one of the pattern recognition. First, the weight vector of the linear discriminant function is calculated using the frequency spectrums of the auscultatory sound that include the fricative sound and the auscultatory sound without the fricative sound. Next, it is judged frequency spectrums of the auscultatory sound whether include the fricative sound using simple perceptron from the calculated weight vector and the frequency spectrum of the auscultatory sound that is recorded by the electronic stethoscope. As a result, I have showed that proposed ii

4 system is able to estimate the fricative sound generation position. Futhermore, the fricative sound is estimated using the proposed system from auscultatory sound that is recorded in the patient s home and including the abnormal breath sound. Additionally, as an application of the proposed system, the abnormal breath sound is estimated from the auscultatory sound that was included the abnormal breath sound. However, the proposed system was not able to estimate the fricative sound and the abnormal breath sound using the auscultatory sound includes the abnormal breath sound. key words Electronic stethoscope, fricative sound, simple perceptron iii

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