Figure 4.

All plots use arbitrary units. (a) MFMR used to measure the patient’s vital signs and the oscillation frequency of a pendulum. Top: Denoised pendulum signal, A₁₀ (frequencies above 6 Hz cut off). Bottom: Human subject signal A₂₀ filtered to amplify respiration (0.01–0.6 Hz band filter) and cardiac motion (0.6–6 Hz band filter). (b) Radar reflection off the subject’s hand vs pressure belt signal. Coached breathing pattern: five deep breaths at 5 s∕cycle, a 18 s breathhold, six breaths at 3 s∕cycle. The signals derived from the radar and from the respiration monitor belt clearly mirror each other.