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Method and system for reliable inspiration-to-expiration ratio extraction from acoustic physiological signal

  • US 20110295138A1
  • Filed: 05/26/2010
  • Published: 12/01/2011
  • Est. Priority Date: 05/26/2010
  • Status: Abandoned Application
First Claim
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1. A physiological monitoring system, comprising:

  • an acoustic physiological signal capture system;

    an acoustic physiological signal processing system communicatively coupled with the capture system; and

    an output interface, wherein the processing system extracts an energy envelope from an acoustic physiological signal captured by the capture system, sets a background sound level to an energy level whereat a predetermined share of data points on the energy envelope is below the energy level, identifies respiration phase start and end times based at least in part on crossings of the energy envelope above the background sound level and computes an inspiration-to-expiration ratio using the respiration phase start and end times, wherein the inspiration-to-expiration ratio is outputted on the output interface.

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