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  • Fetal heart detectors that can detect and measure the fetal heartbeat using acoustic methods similar to phonocardiographs. A sensitive microphone is placed on the maternal abdomen, and the signal picked up by the microphone is filtered to increase the signal-to-noise ratio and amplified to make it audible. The filtered signal is delivered to an audio system (e.g., speaker, headphone) and/or to a cardiotachometer (that may be either external or an integral part of the detector) to measure the instantaneous fetal heart rate.
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