title: The use of digital filters in enhancing the fetal electrocardiogram.
abstract: The use of a low pass digital filter (implemented as a software routine upon a minicomputer) to enhance repetitive biological signals immersed in low frequency noise is described. The method by which a digital filter can emulate a hardware moving window averaging process is outlined. The results of applying such a filter to the enhancement of the fetal electrocardiogram are presented. The criteria used in setting up the filter are also discussed.
mesh_terms: D003201:Computers; D004562:Electrocardiography; D005260:Female; D005318:Fetal Heart / Q000502:physiology*; D006801:Humans; D008433:Mathematics; D011247:Pregnancy