Highpass filters for detecting late potentials

A nonrecursive monotonous binomial highpass filter is suggested for the analysis of the signal averaged electrocardiograms (ECGs). Theoretical background and details of the appropriate design of these filters are given. The application of these digital filters to signal averaged ECGs provides an undistorted detection of late potentials. Time and phase behavior is improved with respect to the recursive Butterworth filter of fourth order, which has been used frequently and successfully to identify late potentials