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Table 3 ECG de-noising performance for various types of noise

From: ECG signal performance de-noising assessment based on threshold tuning of dual-tree wavelet transform

ECG signal corrupted by 5 dB SNR in SNR imp MSE
Flicker noise 5.62309 0.00399
Brownian noise 14.83924 0.00048
Blue noise 13.19360 0.00070
Purple noise 14.65982 0.00050
BW noise 15.24564 0.00044
EM noise 5.65466 0.00397
MA noise 7.21953 0.00277
Combined noise 10.85304 0.00120