Patent ID: 7981045
Filing Date: 2011-07-19
Classification: A61B

Abstract:
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.