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Which of the following is periodic noise source in the foetal ECG signal from the maternal abdomen?

Which of the following is periodic noise source in the foetal ECG signal from the maternal abdomen? Correct Answer Maternal ECG

The major sources of noise in the foetal ECG signal recorded from the maternal abdomen are (i) amplifier input noise, (ii) maternal muscle noise (EMG), (iii) fluctuations in electrode polarization potential, and (iv) maternal ECG. For practical purposes, the first three of these sources can be considered as random whereas the maternal ECG is a periodic noise source.

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