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Fig. 4 | BioMedical Engineering OnLine

Fig. 4

From: Several insights into the preprocessing of electrograms in atrial fibrillation for dominant frequency analysis

Fig. 4

Effects of different pass band ranges on seeking DF. a The original signal; b the spectrum and DF of the signal after band-pass filtering of 40–250 Hz; c the spectrum and DF of the signal after band-pass filtering of 20–40 Hz; d the spectrum and DF of the signal after band-pass filtering of 20–100 Hz; e the spectrum and DF of the signal after band-pass filtering of 40–100 Hz; f the spectrum and DF of the signal after band-pass filtering of 200–400 Hz. Absolute value and LPF at 20 Hz are taken after band-pass filtering in graph bf and the DF is marked out in these figures

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