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See Latest ArticlesMeet the challenge of high-pass filter and ST-segment requirements with a DC-coupled digital electrocardiogram amplifier
Journal of Electrocardiology, 10/29/09
Abächerli R et al. – An AC–coupled ECG amplifier based on a first–order analogue HPF must have a maximum cutoff frequency of 0.05 Hz or requires a phase equalizer causing a delay of the acquired ECG. Because the desired delay during online acquisition should be short, the solution is practical but could be improved. Not the frequency cutoff of the HPF but the phase distortion of such a filter should be discussed. The DC–coupled ECG amplifier is as safe as the AC–coupled ECG amplifier; but it provides a higher degree of freedom for future filter designs certainly improving the ECG signal quality, while the safety can be guaranteed.
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