Probing of human lungs using pulse compression techniques in the low-frequency range of 80–1000 Hz established the fact of preferential sound conduction of longitudinal rather than shear waves to the chest surface via lung parenchyma at propagation velocities from 100 to 15 m/s. Probing via the mouth for the first two to three arrivals revealed a significant difference in the effective angles of incidence of the probe signal wave front onto the chest surface, confirming previously formulated ideas about air-structural and structural mechanisms of sound transmission from the bronchial tree lumen to the chest wall. When probing from the surface of the body from the supraclavicular region, two low-velocity arrivals (15–50 m/s) are observed, the effective vertical angles of incidence of which indicate structural sound conduction from a point source formed by the stamp of a vibrator. Probing with a vibrator from the chest surface in the high-frequency range of 10–19 kHz revealed low-velocity arrivals propagating at 50–150 m/s, interpreted as resulting from the propagation of a longitudinal sound wave through lung parenchyma, and high-velocity arrivals propagating at 150–1000 m/s, related to propagation of a longitudinal wave through dense thoracic tissues. The dependence of the amplitude ratio of the peaks of low- and high-velocity arrivals on air filling the parenchyma was revealed. The low-velocity propagation of longitudinal sound waves in both frequency ranges is hypothetically explained with a model of an “effective” waterlike medium with air microbubbles.

在80-1000 Hz的低频范围内，使用脉冲压缩技术探测人的肺部，建立了这样的事实，即在传播速度为100至15 m / s的情况下，纵波而不是横波通过肺实质进入胸腔。头两到三个到达口的探测表明，探测信号波前到胸腔表面的有效入射角存在显着差异，这证实了先前关于支气管树声音传输的空气结构和结构机制的构想腔至胸壁。从锁骨上区域从身体表面探查时，观察到两个低速到达（15-50 m / s），有效的垂直入射角表示从由振子的压模形成的点源发出的结构声传导。用振动器从胸部表面以10–19 kHz的高频范围进行探测，发现低速传播以50–150 m / s的速度传播，这被解释为是由于纵向声波通过肺实质产生的，速度以150-1000 m / s的速度传播，与纵向波通过密集的胸腔组织的传播有关。揭示了低速和高速到达的峰值的振幅比对填充薄壁组织的空气的依赖性。假设使用带有空气微泡的“有效”水样介质模型来解释纵向声波在两个频率范围内的低速传播。