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Apparatus, method and computer program product for determining respiratory condition

  • US 7,981,045 B2
  • Filed: 07/05/2006
  • Issued: 07/19/2011
  • Est. Priority Date: 07/06/2005
  • Status: Expired due to Fees
First Claim
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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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