Title :
Phase delay of pulmonary acoustic transmission from trachea to chest wall
Author :
Wodicka, George R. ; Aguirre, Andres ; DeFrain, Paul D. ; Shannon, Daniel C.
Author_Institution :
Sch. of Electr. Eng., Purdue Univ., West Lafayette, IN, USA
Abstract :
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\n\n\t\t
Keywords :
acoustic wave propagation; acoustic wave transmission; bioacoustics; lung; 100 to 600 Hz; airways; branching airway structure; chest wall; frequency-dependent propagation time; healthy subjects; parenchyma; phase delay; phase estimation technique; pulmonary acoustic transmission; regional lung structures; sonic energy; sonic noise transmission; sound propagation; spatial dependence; trachea; Acoustic measurements; Acoustic noise; Acoustic propagation; Delay effects; Delay estimation; Frequency estimation; Frequency measurement; Phase estimation; Phase noise; Propagation delay; Acoustics; Humans; Lung; Thorax; Trachea;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
