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Figure 3 | BioMedical Engineering OnLine

Figure 3

From: A hybrid approach to the simultaneous eliminating of power-line interference and associated ringing artifacts in electrocardiograms

Figure 3

Schematic diagram of the two-sided filtration technique. (a) The output y me r n of the notch filter H i (z) when applied to the signal in Figure 2(d); (b) First half of dy me [n]; (c) Another half of dy me [n]; (d) First half of d y me ' n ; (e) Second half of d y me ' n ; (f) First half of ls me [n]; (g) Second half of ls me [n]; (h) Segment of js me [n]; (i) Residues x me n y me n n ; (j) The ultimate output y me n n of the signal in Figure 2(d) processed by the present method. (c), (e) and (g) show results at relevant positions of the first halves. To this example, it is implemented at f s  = 500 Hz with f0 = 50 Hz, and Δf = 3.0 Hz.

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