High-Bandpass Filters in Electrocardiography: Source of Error in the Interpretation of the ST Segment
Figure 8
Reproduction of the ECG signal with summation of the successive harmonics. (a) In the lower part are shown the first two harmonics of the frequency spectrum in which the signal was decomposed. In the upper part, superimposed on the digitized ECG signal, the curve in red colour represents the point-by-point sum of the harmonics indicated. (b, c) Likewise, a representation of the sum of the first 5 and 10 harmonics, respectively.
