HYBRID TIME-FREQUENCY ADAPTIVE FILTERING FOR THE RECOVERY OF VENTRICULAR LATE POTENTIALS

Ventricular late potentials are small ECG components that have signifi cant diagnostic importance. Temporal averaging is used to recover thes e signals from high levels of background noise, but is not the optimum approach. A new form of hybrid time-frequency adaptive filtering is i ntroduced that is based on signal division into a series of frequency bands. This technique is able to process the averaged data further and to reduce significantly the noise levels beyond that achieved by simp le averaging. Examples of the processing are shown and its applicabili ty is discussed.