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. Author manuscript; available in PMC: 2024 Feb 12.
Published in final edited form as: Comput Biol Med. 2020 Nov 21;129:104136. doi: 10.1016/j.compbiomed.2020.104136

Figure 3. Filter Example.

Figure 3.

(A) Unfiltered VF ECG segment during chest compressions. (B) Compressions are detected in the concurrent transthoracic chest impedance signal. (C) Normalized spectrum of ECG during compressions, with compression fundamental and two harmonics visible. (D) 1–30 Hz bandpass filter. (E) Notch filter series based on estimated compression fundamental frequency fcc. (F) Filtered ECG following bandpass and notch filtering. (G) Spectrum of filtered ECG confirms removal of the majority of compression fundamental and first two harmonics. (ECG = electrocardiogram, VF = ventricular fibrillation.)