03940692 is referenced by 63 patents and cites 2 patents.

A method and apparatus for monitoring recurrent waveforms such as electrocardiogram (e.c.g.) waveforms. The e.c.g. apparatus comprises integrators and stores for storing integrated segments of a normal, reference waveform complex. A timing circuit derives timing signals from the e.c.g. waveform to be monitored. The timing signals represent the time location of particular selected parts of the waveform which are to be compared with the corresponding parts of the stored waveform. The e.c.g. waveform is corrected by subtracting a version of the waveform after it has passed through a low pass filter from a delayed version. Corrected segments of the waveform are integrated and subtracted from the corresponding stored segments of the reference waveform to provide a difference signal and the difference signals are quantitatively summed. An output signal is produced if the total sum of the magnitudes of the difference signals exceeds a predetermined value to indicate an abnormal complex.

Apparatus for monitoring recurrent waveforms
Application Number
Publication Number
Application Date
December 14, 1973
Publication Date
February 24, 1976
James McEwan McIntyre Neilson
Woodhams Blanchard and Flynn
The University of Edinburgh
G01R 23/16
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