Patent ID: 9119597
Filing Date: 2015-09-01
Classification: A61B

Abstract:
1. A method for determining respiration rate, the method comprising: receiving a photoplethysmograph (PPG) signal; processing the PPG signal to generate a plurality of morphology signals, each of the morphology signals being indicative of a respective morphology of the PPG signal; generating, using processing equipment, a plurality of autocorrelation sequences by generating a respective autocorrelation sequence for more than one of the plurality of morphology signals; generating, using the processing equipment, a combined autocorrelation sequence from the plurality of autocorrelation sequences; establishing a threshold associated with the combined autocorrelation sequence; identifying a selected peak of the combined autocorrelation sequence based on the threshold; and determining, using the processing equipment, a respiration rate from the combined autocorrelation sequence based on the selected peak.