Assessing the sound of cough towards vocality.
The presented research positively evaluates the vocality of the cough sound by estimating the global cough fundamental frequency or pitch. The fundamental frequency was determined by autocorrelation analysis on both the original time-signal and the linear predicted time-signal. The experimental cough database was registered in the free acoustical field on respectively three pathological and nine healthy non-smoking human subjects and on two pathological and two healthy Belgian Landrace piglets. For both species differences between pitch values for cough-sounds originating from subjects suffering from a respiratory infection and healthy subjects are put forward. The retrieved pitch-difference between respectively healthy and infected subjects indicates the existence of acoustically different cough-classes in accordance with a different cause or physical condition of the respiratory system.
Van Hirtum
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A
Department of Agro-Engineering and Economics, K.U. Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium.
Berckmans
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D
D000162:Acoustics; D000208:Acute Disease; D000328:Adult; D000818:Animals; D001996:Bronchopneumonia / Q000150:complications; D002908:Chronic Disease; D019343:Citric Acid; D003139:Common Cold / Q000150:complications; D003371:Cough / Q000139:chemically induced / Q000145:classification / Q000503:physiopathology*; D005583:Fourier Analysis; D006801:Humans; D015203:Reproducibility of Results; D012135:Respiratory Sounds / Q000503:physiopathology*; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D013045:Species Specificity; D013068:Speech Production Measurement / Q000379:methods*; D013223:Statistics as Topic; D013552:Swine
D019343:Citric Acid