Patent ID: 8684942

Claim:
A system for heart performance characterization and abnormality detection, comprising: an input processor for receiving, first sampled data representing a first signal portion of a heart electrical activity related signal and second sampled data representing a second signal portion different to said first signal portion of the heart electrical activity related signal; and a signal processor for, determining distribution data associated with degree of similarity between the first and second signal portions by determining a difference between (a) values derived by applying a first function to mean adjusted sampled values of the first signal portion and (b) values derived by applying a second function to mean adjusted sampled values of the second signal portion and in response to the distribution data, initiating generation of a message associated with said degree of similarity between the first and second signal portions; wherein said signal processor derives a regularity value by summing a plurality of values individually comprising a product of a determined distribution data value and a logarithm of said distribution data value.