Perfusion Index >= 0.052%
Signal Continuity: Greater than 30sec of continuous RED/IR PPG signal without the 'Low PI, 'Low SNR' and 'Motion' flags set
SNR: PPG signal quality with AC SNR > 35dB (time domain) and pSNR > 10dB (frequency domain) at rest where AC SNR is defined as:
SNR = 20 * Log (PAC / PNoise) where PAC is “peak-to-peak amplitude of PPG pulse” and PNoise is “RMS of AFE noise”.
For Psnr calculation, signal power is defined to be the power of the signal at heartbeat frequency, in addition to its 2nd and 3rd harmonics. The noise power is defined to be the power of all other signal components including motion artifacts.