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Figure 4 | BioMedical Engineering OnLine

Figure 4

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

Figure 4

Comparison of residual coefficients and relevant PSD spectra. (a) The x me n y me r n results from the old method (Δf = 2.0 Hz); (b) Residual part x me n y me n n in Step If = 6.0 Hz); (c) Residual part y me d n in Step IIf = 2.0 Hz); (d) Residual part y me s n in Step IIIf = 2.0 Hz); (e)-(h) show PSD spectra of sequences in (a)-(d), respectively. Spectra of (e)-(h) are calculated by Welch's method [26] at f s  = 500 Hz.

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