Complex binomial bandpass filters for analysing phase and envelope of high frequency components in cardiac signals

A complex binomial bandpass filter is suggested for the analysis of ECG and MCG signals. Theoretical background and details of the appropriate design of these filters are given. Application of these digital filters on ECG/MCG signals provide bandpass signals. Envelope and phase of these signals are used for analysing high frequency components in cardiac signals. Phase variance changes are used to select time intervals dominated by cardiac activity. Mean and variance of the envelope characterize the regularity of the depolarisation process. Two parameters derived from these quantities are used to separate MCGs of patients suffering from ventricular arrhythmia from MCGs of healthy persons