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What is used to delay the change in the time constant in foetal phonocardiograph?

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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 Filter

I 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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