Phonometric Study of the Second Heart Sound in Normal Man

Carlo LONGHINI; Tiziano TOSELLI; Guido MASOTTI; Enrico BELLOTTI; Lucia ANSANI; Gian Franca MUSACCI; Sandro MICHELINI

doi:10.1536/ihj.24.557

Carlo LONGHINI, Tiziano TOSELLI, Guido MASOTTI, Enrico BELLOTTI, Lucia ANSANI, Gian Franca MUSACCI, Sandro MICHELINI

Author information

Keywords: Second heart sound, Spectral analysis, Fast Fourier transform

JOURNAL FREE ACCESS

1983 Volume 24 Issue 4 Pages 557-561

DOI https://doi.org/10.1536/ihj.24.557

Details

Abstract

The fast Fourier transform (FFT) was employed to analyze the frequency spectra of the second heart sound in 19 healthy subjects. The data obtained show that the second heart sound is mainly composed of low-frequency vibrations, and that the frequency vs. amplitude spectra for the various filters do not exceed 150Hz. The different spectra obtained can represent a useful reference to compare with pathological acoustical findings.

Corresponding author

Register with J-STAGE for free!