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    Measurement of Physiology - Respiration Signal

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    A strap, instrumented to measure stretch, is worn around the chest to detect respiration whilst a subject is at-rest. The resulting signal is contaminated by electrical noise from the mains at 50 Hz with a similar amplitude to the respiration signal. Sketch what the contaminated signal might look like.
    The signal is then sampled into a computer. Explain what the resulting digitised signal will look like (using sketches if required) if it is sampled at:
    1. 50 Hz
    2. 100Hz
    3. 500 Hz
    What processing should be done on the computer to recover the respiration signal?

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    https://brainmass.com/physics/phase-changes/measurement-physiology-respiration-signal-35954

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