Poster
# 60
Poster |
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6th Internet World Congress for Biomedical Sciences |
Marcelino Martinez_Sober(1), EMILIO SORIA OLIVAS(2), Antonio J. Serrano López(3), Alfredo Rosado(4), José David Martín Guerrero(5)
(1)Universidad de Valencia - Burjassot. Spain
(2)DPTO INGENIERÍA ELECTRONICA. FACULTAD DE FISICAS - BURJASSOT/VALENCIA. Spain
(3)Dpto. Electrónica. Universidad de Valencia - Burjasot. Spain
(4)Departamento de Electrónica. Universidad de Valencia - Burjassot. Spain
(5)G.P.D.S. Departament d´Enginyeria Electrònica. Universitat de València - Burjassot. Spain
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[New Technology] |
[Cardiolovascular Diseases] |
[Obstetrics & Gynecology] |
The proposed algorithm has been tested for the extraction of the foetal ECG (FECG), by removing the interference of the dominant maternal ECG component. This is a typical application of adaptive filtering as the spectra of both signals, desired and noise, are overlapped and a frequency selective filtering would distort the desired signal, i.e. the FECG. The scheme of an adaptive noise canceller is in fig. 2
Signals are supposed to vary from ±1 so, before applying the algorithm, be must normalise them by the maximum value and removing their mean value. The first fetal signals used in this test have been obtained with a simulator (5). fig. 3 shows the original fetal signal and an abdominal maternal electrocardiogram. In figure 4 fig. 4 we show the outcome of applying a basic LMS with an adaptation constant of 0.2 and the proposed algorithm, clearly noting a minor distortion in the signal obtained by the new method.
Results of the second group of simulations, where we use real foetal registers are shown in figure 5 fig. 5 and figure 6 fig. 6.
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[New Technology] |
[Cardiolovascular Diseases] |
[Obstetrics & Gynecology] |
