【摘要】 阐述了胎儿脐带血流超声Ｄｏｐｐｌｅｒ 频谱分析仪的设计，重点分析了Ｄｏｐｐｌｅｒ频移信号采样和血流频谱参数的算法。由于在ＡＤ 板上不采用ＤＳＰ芯片，大大简化了硬件设计，提高了系统稳定性；在计算血流频谱参数过程中，采用幅度阀值动态更新技术和超时控制避免算法锁死，因此算法自适应强，稳定性好。更多还原

【Abstract】 This paper explains the design of an Ultrasonics Doppler Spectrum Analysis System for fetal umbilical blood flow monitoring. The gist of discussion includes the sampling method of the Doppler signals and the algorithm of the blood flow parameters. Because the DSP chip is not used in the AD cardboard, the hardware design is simplified and the system works steadily. In theprocess of computing the blood flow paramenters, an autochange method of the amplitude threshold and a timeout control technology are used, so the algorithm has good adaptability and works very stable.更多还原