A software-based low pass digital filter can emulate hardware moving window averaging to effectively enhance fetal electrocardiogram signals.
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May facilitate fetal ECG monitoring; leaves open prospective clinical validation before adoption.
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.
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Sheild et al. (1981) studied this question.
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