| Title |
A Study on Stethoscope Signal Analysis for Normal and Heart-diseased Children |
| DOI |
https://doi.org/10.5370/KIEE.2017.66.4.715 |
| Keywords |
Stethoscope signal ; Heart-diseased children ; AR spectra ; Formant frequency ; 1st and 2nd derivatives |
| Abstract |
This study tries to analyze morphology and formant frequencies of linear prediction spectra of stethoscope sounds for heart diseased children. For this object, heart diseased stethoscope sounds were collected in the pediatrics of an university hospital. The collected signals were preprocessed and analyzed by the Burg algorithm, a kind of linear prediction analysis. The linear prediction spectra and the formant frequencies of the spectra for the stethoscope sounds for the normal and the diseased children are estimated and compared. The spectra showed outstanding differences in morphology and formant frequencies between the normal and the diseased children. Normal children showed relatively low frequency of F1(the first formant) and small negative slope from F1. VSD children revealed stiff slope change around F1 to F3. Spectra of ASD children is similar with the normal case, but have negative values of F3. F1-F2 difference of the functional murmur children were relatively large. |