Bandpass filter used in foetal phonocardiogram rejects all frequencies outside the ________ Hz range.(a) 0-40(b) 40-80(c) 70-110(d) 110-150This question was posed to me in exam.This interesting question is from Recording System in division Foetal Monitoring Instruments of Biomedical Instrumentation

Bandpass filter used in foetal phonocardiogram rejects all frequencies

1.	Bandpass filter used in foetal phonocardiogram rejects all frequencies outside the ________ Hz range.(a) 0-40(b) 40-80(c) 70-110(d) 110-150This question was posed to me in exam.This interesting question is from Recording System in division Foetal Monitoring Instruments of Biomedical Instrumentation
Answer» Right option is (c) 70-110 The explanation: To pick up the heart sounds, it is essential that the transducer be 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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