Phase delay of pulmonary acoustic transmission from trachea to chest wall

The frequency-dependent propagation time, or phase delay tau (f), of sonic noise transmission from the trachea to the chest wall was estimated over the 100-600 Hz frequency range using a phase estimation technique from measurements performed on eight healthy subjects. Since tau (f) can be greater th...

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Bibliographic Details
Published in:IEEE transactions on biomedical engineering 1992-10, Vol.39 (10), p.1053-1059
Main Authors: Wodicka, G.R., Aguirre, A., DeFrain, P.D., Shannon, D.C.
Format: Article
Language:English
Subjects:
Acoustic measurements
Acoustic noise
Acoustic propagation
Acoustics
Biological and medical sciences
Delay effects
Delay estimation
Frequency estimation
Frequency measurement
Humans
Investigative techniques, diagnostic techniques (general aspects)
Lung - physiology
Medical sciences
Phase estimation
Phase noise
Propagation delay
Radiodiagnosis. Nmr imagery. Nmr spectrometry
Thorax - physiology
Trachea - physiology
Urinary system
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Summary:The frequency-dependent propagation time, or phase delay tau (f), of sonic noise transmission from the trachea to the chest wall was estimated over the 100-600 Hz frequency range using a phase estimation technique from measurements performed on eight healthy subjects. Since tau (f) can be greater than one period of the input signal at frequencies greater than 100 Hz, the unambiguous phase estimate at 100 Hz was used as a starting point to determine the phase not
ISSN:0018-9294
1558-2531
DOI:10.1109/10.161337