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What is used to detect heart frequency in foetal phonocardiograph?(a) 230 ms one shot(b) 400 ms one shot(c) 20 ms one shot(d) 440 ms one shotThe question was asked in an interview for job.This interesting question is from Recording System topic in section Foetal Monitoring Instruments of Biomedical Instrumentation

Answer»

Correct option is (b) 400 ms ONE shot

Best EXPLANATION: To DETECT the heart frequency, the 400 ms one-shot is used. If the period DURATION is greater than 400 ms, the one-shot will deliver a pulse. The negative slope of this pulse is used to trigger the 20 ms one-shot. These 20 ms pulses are integrated by the integrator and the OUTPUT of this integrator is compared with a fixed voltage -V.



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