Patent ID: 9687159
Date: 2017-06-27
CPC Classifications: A61B

Claim:
1. A method for determining respiration rate information from a photoplethysmograph (PPG) signal, the method comprising: receiving, at processing equipment, the PPG signal from a PPG sensor; generating, using the processing equipment, a derivative signal from the PPG signal; establishing, using the processing equipment, a pass band for a band-pass filter, wherein the establishing the pass band for the pass band filter comprises: filtering, using the processing equipment, the derivative signal based at least in part on the band-pass filter to generate a processed PPG signal; calculating, using the processing equipment, a crossing threshold based at least in part on the processed PPG signal; determining, using the processing equipment, a plurality of fiducial points based at least in part on the crossing threshold and based at least in part on at least one of the PPG signal, the derivative signal, a second derivative of the PPG signal, and the processed PPG signal; determining, using the processing equipment, at least one metric based at least in part on the plurality of fiducial points; determining, using the processing equipment, the respiration rate information by analyzing the at least one metric; and displaying, on a display device, an output indicative of the respiration rate information.