Real-time abdominal fetal ECG recording using a hardware correlator

Shimon Abboud*, Alex Alaluf, Shmuel Einav, Dror Sadeh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A real-time fetal ECG monitoring system using abdominal recording is presented. The system is based on an IBM AT compatible personal computer. The computer lacks the performance required for real-time analysis. Therefore, a new design of a fast hardware correlator board was developed to enhance the computer throughput. The technique is based on a cross-correlation procedure. An averaged maternal ECG waveform is derived using the crosscorrelation function for the waveform's alignment. With this procedure a template signal corresponding to one complete maternal ECG is obtained. The averaged maternal ECG is then subtracted from the abdominal signals. Thus, it is possible to detect all the fetal ORS complexes in spite of their coincidence with the maternal ECG. An averaged fetal ECG is then extracted to improve the signal-to-noise ratio, making it possible to recognize fetal P and T waves.

Original languageEnglish
Pages (from-to)325-335
Number of pages11
JournalComputers in Biology and Medicine
Issue number5
StatePublished - Sep 1992


  • Abdominal ECG
  • Fetal monitoring
  • Signal averaging


Dive into the research topics of 'Real-time abdominal fetal ECG recording using a hardware correlator'. Together they form a unique fingerprint.

Cite this