Figure 1.
RR tachogram extraction algorithm overview. Input, xn, is the ECG signal, which is initially bandpass filtered and then processed in the three blocks: R peak detection, artifact detection, and ectopic beat detection. Output from the R peak detection block is used to store variables that contain dynamic information, Rm, and morphological information for each heartbeat, HB segments, Cm, which is used to design a HB template, T. Based on this information, each Cm is firstly evaluated in the artifact detection block, updated, and then evaluated in the ectopic beat block. The final output is the RR tachogram extracted from the updated Rm, fs: samling frequency.