Use of the fast Fourier transform for frequency analysis of the first heart sound in normal man.
D000162:Acoustics; D000293:Adolescent; D000328:Adult; D003201:Computers; D005583:Fourier Analysis; D006326:Heart Auscultation; D006347:Heart Sounds; D006801:Humans; D008297:Male; D010701:Phonocardiography