title: [The design of the ultrasonic Doppler spectrum analyze system for the naval blood stream of fetus].
abstract: The design of the Ultrasonic Doppler Specturm Analyze System for the naval blood stream of the fetus is discussed, mainly on the sampling method of the Doppler signals and the algorithm of the blood stream parameters. Because the DSP chip is not used in the AD cardboard, the hardware design is not only simplified, but also works more steady. In the process of the blood stream parameters, an autochange method of the amplitude threshold and a time-out control technology are used, so the algorithm has good adaptation and works very stable.
authors.affiliation: Xi'an Jiao Tong University.
authors.forename: O
authors.initials: O
authors.lastname: Yang
authors.forename: H
authors.initials: H
authors.lastname: Du
authors.forename: D
authors.initials: D
authors.lastname: Zhang
authors.forename: Z
authors.initials: Z
authors.lastname: Bian
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D005260:Female; D005333:Fetus / Q000098:blood supply*; D006801:Humans; D011247:Pregnancy; D012039:Regional Blood Flow; D018608:Ultrasonography, Doppler / Q000295:instrumentation*; D014470:Umbilical Cord / Q000098:blood supply* / Q000000981:diagnostic imaging