Method and system for reliable inspiration-to-expiration ratio extraction from acoustic physiological signal
First Claim
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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Abstract
A method and system for reliably estimating inspiration-to-expiration ratio from an acoustic physiological signal. A background sound level is set to an energy level whereat a predetermined share of data points on an energy envelope is below the energy level, after which respiration phase start and end times are determined at energy crossings above the background sound level, enabling more reliable determination of respiration phases. Moreover, reliably determined respiration phase start and end times, in addition to being used to estimate inspiration-to-expiration ratio, are applied to other purposes, such as estimating respiration period, validating an independently computed respiration period and/or adjusting a sampling window of the acoustic physiological signal, reducing system complexity and conserving computational resources.
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Citations
19 Claims
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1. A physiological monitoring system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A physiological monitoring method, comprising the steps of:
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capturing by a physiological monitoring system an acoustic physiological signal; extracting by the system an energy envelope of the acoustic physiological signal; setting by the system a background sound level to an energy level whereat a predetermined share of data points on the energy envelope is below the energy level; identifying by the system respiration phase start and end times based at least in part on crossings of the energy envelope above the background sound level; computing by the system an inspiration-to-expiration ratio using the respiration phase start and end times; and outputting by the system the inspiration-to-expiration ratio. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification