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BSPII-ch3-filtering-time-2008

Blent ylmaz b bme402 biomedical signal processing ii

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Unformatted text preview: n performed • ECG signals – filtered by detecting the QRS complexes and their position to align the waveforms Dr. Bülent Yılmaz Bü BME402: Biomedical Signal Processing-II Processing7 Algorithm • M repetitions -> SNR increase by a factor √M • Obtain a number of realizations • Determine a reference point – Trigger if external stimulation – Repetitive events • QRS complexes in the ECG or S1 and S2 in the PCG • Extract parts corresponding to events and add them • to a buffer Divide the results in the buffer by the # of events added BME402: Biomedical Signal Processing-II Processing- Dr. Bülent Yılmaz Bü 8 4 Example: Visual ERPs Averaging over 10 repetitions Averaging over 20 repetitions Dr. Bülent Yılmaz Bü BME402: Biomedical Signal Processing-II Processing- 9 Example: Noisy ECG signal • Sample QRS complex • Template matching – Normalized crosscrosscorrelation – First beat used as a template (86 ms) • Cross-correlation peaks Cross• (value is 1) at the locations of QRS Choose an appropriate threshold (be careful!) Dr. Bülent Yılmaz Bü BME402: Biomedical Signal Processing-II Processi...
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