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  • Title: [The design of an ultrasonics Doppler spectrum analysis system for fetal umbilical blood flow monitoring].
    Author: Du H, Yang Q, Bian Z.
    Journal: Sheng Wu Yi Xue Gong Cheng Xue Za Zhi; 1999 Mar; 16(1):120-3. PubMed ID: 12553292.
    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 the process 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.
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