RECOVERING THE PRECISE HEART RATE FROM SPARSELY SAMPLED ELECTROCARDIOGRAMS

This work deals with a potential possibilities of improvement to the precision of time dependencies (e. g. heart rate) derived from a standard digital Holter record. The sampling frequency of a typical 24-hour ECG record is usually a compromise between signal quality and memory requirements. But even with a sampling interval of about 8 ms, is still possible to maintain the accuracy of 1...2 ms in R-wave delimitation and in consequence – precise heart rate measurement. The proposed method uses quadratic approximation of the ECG signal in 32-ms surroundings of R-wave peak and delivers satisfying results without significant increase of computing time.