Regularity assessment of high frequency components in magneto/electrocardiograms of healthy subjects and risk patients

Bandlimited high frequency signals can be described by their envelope and phase. Complex binomial bandpass filters are an appropriate tool to generate bandlimited cardiac signals used for analysing envelope and phase. A signal processing method is suggested to evaluate signal changes of envelope and phase from beat to beat. Two parameters relied on variance of envelope and current frequency (derivative of the phase) were derived to assess the regularity of cardiac high frequency components within a frequency range of interest. They can be used to separate cardiac signals of patients suffering from ventricular arrhythmia from cardiac signals of healthy persons.