Apparatus, method and computer program product for determining respiratory condition
First Claim
1. An apparatus for determining a respiratory condition comprising:
- a breath sound measuring unit measuring a breath sound signal passing through a subject'"'"'s airway by a breathing;
a respiratory synchronous component extracting unit calculating a first frequency spectrum and a second frequency spectrum by performing frequency conversion, the first frequency spectrum being a frequency spectrum of the breath sound corresponding to a maximum value on an envelope curve, the second frequency spectrum being a frequency spectrum of the breath sound corresponding to a minimum value on the envelope curve, the envelope curve being obtained by performing rectifying integration of the breath sound signal and extracting a respiratory synchronous component that is difference between the first frequency spectrum and the second frequency spectrum; and
a respiratory condition determining unit determining a subject'"'"'s respiratory condition worsens when a frequency shift is equal to or greater than a predetermined value, the frequency shift indicating a change between a respiratory synchronous component when the subject is in a normal state and the extracted respiratory synchronous component.
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Accused Products
Abstract
An apparatus for determining a respiratory condition includes a breath sound measuring unit 111 measuring a breath sound passing through a subject'"'"'s airway by a breathing; a frequency converting unit 132 converting a frequency on the breath sound to obtain a frequency spectrum; a respiratory synchronous component extracting unit 134 extracting a respiratory synchronous component, which varies depending on the breathing, from the frequency spectrum; a frequency distribution detecting unit 136 detecting a frequency distribution of the respiratory synchronous component; and a respiratory condition determining unit 138 determining a subject'"'"'s respiratory condition based on the frequency distribution. According to the apparatus, various symptoms, such as airway occlusion, respiratory obstruction and the like in relation to breathing during sleep can be determined.
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Citations
15 Claims
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1. An apparatus for determining a respiratory condition comprising:
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a breath sound measuring unit measuring a breath sound signal passing through a subject'"'"'s airway by a breathing; a respiratory synchronous component extracting unit calculating a first frequency spectrum and a second frequency spectrum by performing frequency conversion, the first frequency spectrum being a frequency spectrum of the breath sound corresponding to a maximum value on an envelope curve, the second frequency spectrum being a frequency spectrum of the breath sound corresponding to a minimum value on the envelope curve, the envelope curve being obtained by performing rectifying integration of the breath sound signal and extracting a respiratory synchronous component that is difference between the first frequency spectrum and the second frequency spectrum; and a respiratory condition determining unit determining a subject'"'"'s respiratory condition worsens when a frequency shift is equal to or greater than a predetermined value, the frequency shift indicating a change between a respiratory synchronous component when the subject is in a normal state and the extracted respiratory synchronous component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A computer program product having a non-transitory computer readable medium including programmed instructions for determining respiratory condition, wherein the instructions, when executed by a computer, cause the computer to perform:
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measuring a breath sound signal passing through a subject'"'"'s airway by a breathing; calculating a first frequency spectrum and a second frequency spectrum by performing frequency conversion, the first frequency spectrum being a frequency spectrum of the breath sound corresponding to a maximum value on an envelope curve, the second frequency spectrum being a frequency spectrum of the breath sound corresponding to a minimum value on the envelope curve, the envelope curve being obtained by performing rectifying integration of the breath sound signal; extracting a respiratory synchronous component that is difference between the first frequency spectrum and the second frequency spectrum; detecting a frequency distribution of the respiratory synchronous component; and determining a subject'"'"'s respiratory condition worsens when a frequency shift is equal to or greater than a predetermined value, the frequency shift indicating a change between a respiratory synchronous component when the subject is in a normal state and the extracted respiratory synchronous component.
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Specification