SVD-based on-line exercise ECG signal orthogonalization

B. Acar, H. Koymen
1999 IEEE Transactions on Biomedical Engineering  
An orthogonalization method to eliminate unwanted signal components in standard 12-lead exercise electrocardiograms (ECG's) is presented in this work. A singular-valuedecomposition-based algorithm is proposed to decompose the signal into two time-orthogonal subspaces; one containing the ECG and the other containing artifacts like baseline wander and electromyogram. The method makes use of redundancy in 12lead ECG. The same method is also tested for reconstruction of a completely lost channel.
more » ... e online implementation of the method is given. It is observed that the first two decomposed channels with highest energy are sufficient to reconstruct the STsegment and J-point. The dimension of the signal space, on the other hand, does not exceed three. Data from 23 patients, with duration ranging from 9 to 21 min, are used. Index Terms-Electromyogram (EMG) and baseline wander (BW) elimination, exercise electrocardiogram (ECG), online orthogonalization, signal enhancement, singular value decomposition (SVD).
doi:10.1109/10.748984 pmid:10097466 fatcat:zj4q3g3yyna55fx6apegstg45y