Patent Document ID: 9351665
Application ID: 13144502
Patent Status: 1

Claim One:
1. A method of analyzing a photoplethysmograph signal, comprising: segmenting the photoplethysmograph signal into at least a plurality of temporal segments; extracting from each temporal segment of said plurality of temporal segments a plurality of features including at least respiration parameters, to construct a multidimensional feature space; employing a path selection procedure to said multidimensional feature space to assign a respiration frequency or a range of respiration frequencies separately for each segment of said plurality of temporal segments, thereby determining at least one sequence of respiration frequencies, wherein each respiration frequency or range of respiration frequencies corresponds to a state of said multidimensional feature space and wherein said path selection procedure calculates probabilities of transitions between states; reconstructing a respiratory signal using said sequence; and displaying said reconstructed respiratory signal and adjusting a therapy based on said displayed reconstructed respiratory signal.