HKIE Professional Assessment - Biomedical Discipline Practice Questions - HKIE Professional Assessment - Biomedical Discipline (Hong Kong Institution Of Engineers) Exam

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An electroencephalogram (EEG) signal contains clinical diagnostic spectral components up to 70 Hz (gamma band). According to the Nyquist-Shannon sampling theorem, what is the absolute minimum theoretical sampling rate required, and what practical anti-aliasing cut-off strategy should be employed?

Minimum sampling rate 140 Hz; anti-aliasing low-pass filter set at or below 70 Hz before digitization Minimum sampling rate 70 Hz; anti-aliasing high-pass filter set at 70 Hz before digitization Minimum sampling rate 280 Hz; anti-aliasing bandpass filter set between 70 Hz and 140 Hz Minimum sampling rate 100 Hz; anti-aliasing notch filter centered at 50 Hz power mains frequency

Correct Answer:

Minimum sampling rate 140 Hz; anti-aliasing low-pass filter set at or below 70 Hz before digitization

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