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Crystal microphone is used for picking _______ signals.

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Crystal  microphone is used for picking _______ signals.

(a) cardiac

(b) brain

(c) phono

(d) muscles

This question was posed to me in examination.

My question is based upon Recording System in chapter Foetal Monitoring Instruments of Biomedical Instrumentation

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Best answer
Right choice is (c) phono

To explain I would say: To pick up the heart sounds, it is essential that the transducer is properly placed and its impedance carefully matched. A crystal microphone is used for picking up phono signals. The phono transducer signals are amplified by a low noise preamplifier and fed to a bandpass filter which rejects all frequencies outside the 70 to 110 Hz range.

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