Reducing data acquisition, power and processing for hemodynamic signal sampling

A system for reducing the amount of data required to analyze a hemodynamic signal, comprising:

• one or more sensors configured to produce one or more hemodynamic signals, wherein the hemodynamic signals comprise at least a photoplethysmography (PPG) signal;
• a light source and a light detector to produce the PPG signal;
• and
• a computer readable medium comprising computer executable instructions that when executed by a processor cause the processor to:
• (a) in response to detecting a specific event associated with a cyclical body function, continuously sample the one or more hemodynamic signals during a window following the detecting of the specific event, to thereby produce a plurality of samples, wherein the window is shorter than a cycle associated with the cyclical body function and wherein the window includes a minimum and a maximum of the PPG signal produced within the cycle associated with the cyclic body function;
• (b) repeat step (a) a plurality of times such that a plurality of samples is produced for each of a plurality of said windows;
• and
• (c) analyze the one or more hemodynamic signals based on the plurality of samples, wherein said analyzing step comprises averaging the plurality of samples produced for each of the plurality of said windows to thereby produce an average value for each of said windows, wherein the cyclical body function comprises respiration, and wherein the cycle associated with the cyclical body function comprises a respiratory cycle.

A system for reducing the amount of data required to analyze a hemodynamic signal, comprising:

• a sampler configured to continuously sample the hemodynamic signal during a window following a detection of a specific event associated with a cyclical body function, to thereby produce a plurality of samples, wherein the window is shorter than a cycle associated with the cyclical body function and wherein the window includes a minimum and a maximum of the hemodynamic signal produced within the cycle associated with the cyclic body function;
• a processor configured to analyze the hemodynamic signal based on the plurality of samples wherein the processor averages the plurality of samples produced for the window to thereby produce an average value for the window, wherein the hemodynamic signal comprises a photoplethysmography (PPG) signal;
• and
• a light source and a light detector to produce the PPG signal, wherein the cyclical body function comprises respiration, and wherein the cycle associated with the cyclical body function comprises a respiratory cycle.