Frequency bandwidth limitations in the signal-averaged ECG by the maximum coherence matching technique

OJ Escalona, RH Mitchell

Research output: Contribution to journalArticle

Abstract

Signal averaging of the ECG is a non-invasive technique that can disclose information about the pathological state of the heart. However, the averaging process can impose serious limitations on the spectral range of the signal output. In particular, the averaging process that achieves beat alignment by means of maximum coherence matching with a template beat has a frequency response that is susceptible to different factors, such as the noise level in the recorded ECG and the configuration of the template beat. An assessment of the extent that these factors affect the bandwidth of the averaging process was carried out by means of computer simulation methods. The results show that 50 Hz noise has a dominant effect over EMG noise, and they suggest that this technique of beat alignment may perform irregularly when analysing high-frequency ECG signals above 500 Hz.
Original languageEnglish
Pages (from-to)177-186
JournalAutomedica
Volume13
Issue number2 and
Publication statusPublished - 15 Mar 1991

Keywords

  • Signal-averaged ECG
  • SAECG
  • late potential
  • maximum coherence matching
  • computer simulation
  • correlation coefficient
  • matched filter
  • low-pass filter effects.

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