Meno F, Reddy P S, Bernardi L
Clin Phys Physiol Meas. 1985 May;6(2):123-9. doi: 10.1088/0143-0815/6/2/003.
Simultaneous quantitative recordings of pressure in the aorta near a prosthetic valve and at two locations externally on the chest provide data on certain aspects of sound propagation in the human thorax. On the basis of the different speeds of propagation, it is possible to distinguish between the longitudinal and transverse vibrations contributing to the external phonocardiographic signal. Digital signal processing was employed to derive transfer functions, correlations and power spectra.
同时定量记录人工瓣膜附近主动脉的压力以及胸部外部两个位置的压力，可提供有关声音在人体胸部传播某些方面的数据。根据不同的传播速度，可以区分对外部心音图信号有贡献的纵向振动和横向振动。采用数字信号处理来推导传递函数、相关性和功率谱。
