Document Type and Number:
Japanese Patent JPS4878793
Kind Code:
A
Abstract:
Biological signals (especially, e.g., fetal QRS complexes) are monitored with signal processing circuitry featuring, in various aspects, in the fetal heart rate monitor, automatic thresholding of maternal and fetal signals; a digital phase lock loop for generating fetal heart rate signals related to the loop frequency, the loop including means for estimating the rate during occurrences of blank spaces caused by removal of signals representing merged maternal and fetal heart beats; counter controlled means for disabling readout; low impedance preamplification of signals received from the body; and a low Q filter with significant useful output energy in the 50-100Hz range, 60Hz noise being removed by a notch filter.
Application Number:
JP453873A
Publication Date:
October 22, 1973
Filing Date:
December 29, 1972
Export Citation:
International Classes:
A61B5/0245; A61B5/344; (IPC1-7): A61B5/04