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How are foetal heart sounds picked up from the maternal abdomen?

How are foetal heart sounds picked up from the maternal abdomen? Correct Answer Sensitive Microphone

Foetal heart sounds can be picked up from the maternal abdomen by a sensitive microphone. The heart sounds in the form of mechanical vibrations have to pass through tissue structure and the signals picked up are rather weak because of distance effects and the small size of foetal heart valves.

Related Questions

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The Proper sequence should be:
Which of the following is periodic noise source in the foetal ECG signal from the maternal abdomen?
Foetal ECG signal detected via electrodes placed on mother’s abdomen is complex and requires accertion of maternal signals for obtaining FHR.
Foetal ECG signal detected via electrodes placed on mother’s abdomen is complex and requires attenuation of maternal signals for obtaining FHR.
Three cards are picked from all heart cards in the deck. Find the number of ways to pick if Ace is one of the cards picked and king is not picked.
Which transducer cannot be used in the same place as the foetal heart rate detector, thus the patient must have two transducers on her abdomen?