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___________ amplifier circulatory is employed to reduce the hum noise generated by the power supply in the ECG circuit.

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___________ amplifier circulatory is employed to reduce the hum noise generated by the power supply in the ECG circuit.

(a) low pass filters

(b) high pass filters

(c) band pass filters

(d) notch filters

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I need to ask this question from Measurement of Hearing topic in section Audiometry of Biomedical Instrumentation

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Right answer is (d) notch filters

Best explanation: CMRR of the order of 100–120 dB with 5 kW unbalance in the leads is a desirable feature of ECG machines. A notch filter is employed to suppress the hum noise generated by the power supply in the ECG circuit.The instability of the baseline, originating from the changes of the contact impedance, demands the application of the automatic baseline stabilizing circuit.

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