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Phase delay of pulmonary acoustic transmission from trachea to chest wall

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4 Author(s)
Wodicka, G.R. ; Sch. of Electr. Eng., Purdue Univ., West Lafayette, IN, USA ; Aguirre, A. ; DeFrain, P.D. ; Shannon, D.C.

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

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Biomedical Engineering, IEEE Transactions on  (Volume:39 ,  Issue: 10 )