Figure 4

Comparison of residual coefficients and relevant PSD spectra. (a) The $x_{\mathit{me}}\left[n\right]-y_{\mathit{me}}^r\left[n\right]$ results from the old method (Δf = 2.0 Hz); (b) Residual part $x_{\mathit{me}}\left[n\right]-y_{\mathit{me}}^n\left[n\right]$ in Step I (Δf = 6.0 Hz); (c) Residual part $y_{\mathit{me}}^d\left[n\right]$ in Step II (Δf = 2.0 Hz); (d) Residual part $y_{\mathit{me}}^s\left[n\right]$ in Step III (Δf = 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.