Fig. 8
From: Fast time-varying linear filters for suppression of baseline drift in electrocardiographic signals
Input signal No. MA1_065_12 (lead V2) x(n) and output signal y(n) are visually identical in standard scale (upper panel) for the time-varying HP filter with −0.5 dB at f c = f ECG . Vertical detail of x(n) (light grey line) and y(n) (black line) (middle panel). Error signal e(n) = x(n) − y(n) (lower panel)