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A cross-spectral method for determining the longitudinal velocity of sound in the tissues of a human chest in vivo is proposed and substantiated. The method is based on the detection of a percussion stroke by two acoustic sensors positioned over opposite parts of a lung. Statistical estimates are obtained for the longitudinal velocity of sound in chest tissues (the middle part of the right lung) from a group of three men (40–47 years old) without any evident lung disorders in the frequency ranges of 80–130, 170–290, and 350–500 Hz. The adequacy of the double-resonance acoustic model of the human respiratory tract, which combines the resonance of the air volume in the human chest and the wave resonances of the bronchial tree as a narrow pipe, is experimentally verified.
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Коренбаум et al. (2005) studied this question.
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