【摘要】 胎儿心率检测是胎儿监护的重要环节,它对于实现优生优育具有重要的意义。首先介绍了医用超声多普勒胎儿心率检测系统的整体结构,然后对伪随机码的距离选通原理作了介绍,并用仿真软件SystemView对系统及其性能进行了仿真,从而说明系统采用伪随机码比使用连续波更具有优点。更多还原

【Abstract】 Fetal heart rate(FHR)examination is an important part of the fetal detection and it is important for keeping pregnant women and foetuses healthy.The whole architecture of the ultrasonic Doppler system used in detecting the rate of heart is introduced.The principle for how to control the depth we want to get the signal from is described.The whole system and its performance are simulated using the SystemView software.It is shown that described using the PN code is better than using the continuous wave.更多还原