Stagg J, Gennser G
J Med Eng Technol. 1978 Sep;2(5):246-8. doi: 10.3109/03091907809161810.
Measurement of foetal breathing movements is becoming more common as a means of monitoring processes occurring in the human foetus. Conventional time-period analysis of breathing movements is prone to error owing to their complexity, and it is laborious to decipher any frequency pattern. The described apparatus has been designed to give an on-line visual indication of the instantaneous frequency of foetal breathing movements when measured by a time-distance recorder connected to an echoscope. It is affected insignificantly by spurious signals, and can be build cheaply with easily-available components. Practical trials suggest that frequency analysis by this device can be of value for examining episodes of continuous breathing movements in the foetus.
测量胎儿呼吸运动作为监测人类胎儿所发生过程的一种手段正变得越来越普遍。由于呼吸运动的复杂性，对其进行传统的时间段分析容易出错，而且解读任何频率模式都很费力。所描述的仪器旨在当通过连接到超声示波器的时间-距离记录器进行测量时，对胎儿呼吸运动的瞬时频率给出在线视觉指示。它受虚假信号的影响很小，并且可以用容易获得的部件廉价地制造。实际试验表明，该设备进行的频率分析对于检查胎儿连续呼吸运动的发作可能有价值。
