Figure 1

Procedure to detect ventricular and supraventricular ectopic beat by random projections and RR intervals. DS1 was used as the training set and DS2 as the testing set, both datasets based on inter-patient data partitioning. First, random projection and SVM ensemble were used to discriminate ventricular ectopic beat (VEB) from the preprocessed heartbeats, as shown in the dashed box (The details of this section will be introduced in Figure 2). Then the ratios of RR intervals were compared to a predetermined threshold of 0.8 to detect supraventricular ectopic beat (SVEB) from the remaining heartbeats.