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What is used to delay the change in the time constant in foetal phonocardiograph?(a) Preamplifier(b) Notch Filter(c) Integrator(d) Band Pass FilterI have been asked this question during an online exam.The question is from Recording System in chapter Foetal Monitoring Instruments of Biomedical Instrumentation

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Right option is (c) Integrator

To explain: The integrator is USED to DELAY the change in the time CONSTANT and to make sure that a change of on-time takes place only if several (3 to 4) heart beats with the LONGER period DURATION (below 150 bpm) are present.



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