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本文阐述了胎儿超声Doppler脐带血流频谱分析仪的设计，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板上不使用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，采用幅度阈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。
This article describes the design of fetal ultrasound Doppler umbilical cord blood flow spectrum analyzer, and focuses on the analysis of Doppler frequency shift signal sampling and blood flow spectral parameters. Because the DSP chip is not used on the AD board, the hardware design is greatly simplified and the system stability is improved. In the process of calculating the blood flow spectrum parameters, the dynamic updating of the amplitude threshold and the timeout control to avoid the algorithm lock up, so the algorithm is adaptively strong. Good stability.