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GATE 2024 BM – Question 45

Sensors and Bioinstrumentation · Biopotentials and Electrodes · 2 marks · Multiple choice

To isolate alpha EEG, the diagram cascades ideal high-pass cutoff fh,low-pass cutoff fl,then ADC sampling at fs. Which choice works?

Diagram for GATE 2024 BM question 45
  1. fh=8,fl=12,fs=12 Hz
  2. fh=4,fl=6,fs=24 Hz
  3. fh=6,fl=4,fs=12 Hz
  4. fh=8,fl=12,fs=48 Hz

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Correct answer: (D) fh=8,fl=12,fs=48 Hz

Explanation

The desired band is approximately eight to twelve hertz, so high-pass cutoff eight and low-pass cutoff twelve retain it. Sampling must exceed twice the highest retained frequency, twenty-four hertz. Forty-eight satisfies this while twelve does not. Thus D.

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