METHOD FOR EXTRACTING THE FEATURE OF AN ABDOMINAL BREATHING AND A SYSTEM USING THE SAME
First Claim
1. A method for extracting the feature of an abdominal breathing, comprising the following steps of:
- receiving an abdominal breathing signal;
executing an empirical mode decomposition process on the abdominal breathing signal, for computing a plurality of intrinsic mode functions;
basing on the plurality of intrinsic mode functions and the results obtained after the execution of a Hilbert transform on the plurality of intrinsic mode functions, computing an Euler angle function of each of the plurality of intrinsic mode functions;
taking the partial derivative of the Euler angle function of each of the plurality of intrinsic mode functions, with respect to time, for computing an instantaneous frequency function of each of the plurality of intrinsic mode functions, and extracting a plurality of maximum values of each of the plurality of instantaneous frequency functions; and
according to a pre-determined sequence, comparing the plurality of maximum values of each of the plurality of instantaneous frequency functions with a zero-point threshold region, respectively, and when a result that all of the plurality of maximum values of one of the plurality of instantaneous frequency functions falling into the zero-point threshold region is obtained, the instantaneous frequency function having the plurality of maximum values is defined as an abdominal breathing feature function.
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Abstract
A method for extracting the feature of an abdominal breathing is disclosed, capable of extracting the feature of an abdominal breathing, without the requirement of a standard model of an abdominal breathing and the execution of a learning process being executed prior to the method for extracting the feature of an abdominal breathing. By means of computing a plurality of intrinsic mode functions corresponding to the abdominal breathing signal received, an Euler angle function and an instantaneous frequency function of each of the plurality of intrinsic mode functions, and comparing the plurality of instantaneous frequency function with a pre-determined zero-point threshold region, the method for extracting the feature of an abdominal breathing defines one of the plurality of instantaneous frequency function as an abdominal breathing feature function, which contains the feature of the abdominal breathing. In this way, the feature of an abdominal breathing is extracted.
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Citations
16 Claims
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1. A method for extracting the feature of an abdominal breathing, comprising the following steps of:
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receiving an abdominal breathing signal; executing an empirical mode decomposition process on the abdominal breathing signal, for computing a plurality of intrinsic mode functions; basing on the plurality of intrinsic mode functions and the results obtained after the execution of a Hilbert transform on the plurality of intrinsic mode functions, computing an Euler angle function of each of the plurality of intrinsic mode functions; taking the partial derivative of the Euler angle function of each of the plurality of intrinsic mode functions, with respect to time, for computing an instantaneous frequency function of each of the plurality of intrinsic mode functions, and extracting a plurality of maximum values of each of the plurality of instantaneous frequency functions; and according to a pre-determined sequence, comparing the plurality of maximum values of each of the plurality of instantaneous frequency functions with a zero-point threshold region, respectively, and when a result that all of the plurality of maximum values of one of the plurality of instantaneous frequency functions falling into the zero-point threshold region is obtained, the instantaneous frequency function having the plurality of maximum values is defined as an abdominal breathing feature function. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An abdominal breathing feature extracting system, comprising:
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a sensing module, for sensing an abdominal breathing signal; a computing module, coupled with the sensing module, for extracting an abdominal breathing feature function; and an abdominal breathing feature output module, coupled with the computing module, for outputting the abdominal breathing feature function; wherein, the computing module extracts the abdominal breathing feature function from the abdominal breathing signal by means of executing an abdominal breathing feature extracting method, and the abdominal breathing feature extracting method comprises the following steps of; receiving the abdominal breathing signal; executing an empirical mode decomposition process on the abdominal breathing signal, for computing a plurality of intrinsic mode functions; basing on the plurality of intrinsic mode functions and the results obtained after the execution of a Hilbert transform on the plurality of intrinsic mode functions, computing an Euler angle function of each of the plurality of intrinsic mode functions; taking the partial derivative of the Euler angle function of each of the plurality of intrinsic mode functions, with respect to time, for computing an instantaneous frequency function of each of the plurality of intrinsic mode functions, and extracting a plurality of maximum values of each of the plurality of instantaneous frequency functions; and according to a pre-determined sequence, comparing the plurality of maximum values of each of the plurality of instantaneous frequency functions with a zero-point threshold region, respectively, and when a result that all of the plurality of maximum values of one of the plurality of instantaneous frequency functions falling into the zero-point threshold region is obtained, the instantaneous frequency function having the plurality of maximum values is defined as the abdominal breathing feature function. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification