A Fetal ECG Signal Monitoring System Using Digital Signal Processor

디지털 신호처리기를 사용한 태아심전도 신호 추출 시스템

  • 박영철 (연세대학교 전자공학과) ;
  • 조병모 (연세대학교 전자공학과) ;
  • 김남현 (연세대학교 의용공학과) ;
  • 김원기 (연세대학교 의용공학과) ;
  • 박상휘 (연세대학교 전기공학과) ;
  • 연대희 (연세대학교 전자공학과)
  • Published : 1989.09.01

Abstract

This paper describes the implementation of a real time fetal ECG monitoring system in which an adaptive multi-channel noise canceller is realized using the Texas Instruments TMS32020 progrmmmable ditital signal processor. An ECG signal from the electrode placed on the mother's abdomen and three ECGs from those on the chest are applied as the desired signal and the referened inputs, respectively, of the multi-channel filter. The coefficients of the filter are updated using the LMS algorithm such that the output of the multi-channel filter copies the maternal ECG embedded in the abdominal ECG. The enhanced fetal ECG is obtained by subtracting the filter output from the abdominal ECG, and the difference signal is recorded. Both off-line and on-line experimental results are presented to verify the effectiveness of the parameters for the digital signal processing algorithms and the prototype system.

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