| Title |
EMG Signal Elimination Using Enhanced SVD Filter in Multi-Lead ECG |
| Authors |
박광리(Park, Kwang-Li) ; 박세진(Park, Se-Jin) ; 최호선(Choi, Ho-Sun) ; 정기삼(Jeong, Kee-Sam) ; 이경중(Lee, Kyoung-Joung) ; 윤형로(Yoon, Hyoung-Ro) |
| Keywords |
SVD filter ; EMG ; Multi-lead stress ECG ; Signal decomposition |
| Abstract |
SVD(Singular Value Decomposition) filter for the suppression of EMG in multi-lead stress ECG is studied. SVD filter consists of two parts. In the first part, the basis vectors were chosen from the averaged singular vectors obtained from the decomposed noise-free ECG. The singular vector is computed from the stress ECG and is compared itself with basis vectors to know whether the noise exist in stress ECG. In the second part, the existing elimination method is used, when one(or two) channels is(or are) contaminated by noise. But the proposed enhanced SVD filter is used in case of having the noise in the many channels. During signal decomposition and reconstruction, the noise-free channel or the least noisy channel have the weight of 1, the next less noisy channel has the weight of 0.8. In this way, every channel was weighted by decreased of 0.2 in proportion to the amount of the added noise. For the evaluation of the proposed enhanced SVD filter, we compared the SNR computed by the enhanced SVD filter with the standard average filter for the noise-free signal added with artificial noise and the patient data. The proposed SVD filter showed better in the SNR than the standard average filter. In conclusion, we could find that the enhanced SVD filter is more proper in processing multi-lead stress ECG. |