Title:
ADAPTIVE ACOUSTIC SIGNAL FILTERING FOR RESPIRATION MONITORING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2014/076892
Kind Code:
A1
Abstract:
An adaptive acoustic signal filter for a respiration monitoring system includes a filter stage and a cutoff frequency adapter. The filter stage applies a cutoff frequency to an input acoustic signal waveform containing respiration and heart sound components in a filtering operation to produce a filtered acoustic signal waveform from which heart sound components have been removed. The adapter then performs cutoff frequency optimization tests on the filtered signal waveform and determines from the tests whether adjustment of the cutoff frequency is indicated. These tests assess whether the filtering operation struck a proper balance between removing heart sound components and preserving respiration sound components in the filtered signal waveform. If adjustment of the cutoff frequency is indicated, the adapter adjusts the cutoff frequency and the adjusted cutoff frequency is provided to the filter stage for application in a next filtering operation performed on the input signal waveform.
Inventors:
LAI YUNGKAI KYLE
FU YONGJI
FU YONGJI
Application Number:
PCT/JP2013/006322
Publication Date:
May 22, 2014
Filing Date:
October 25, 2013
Export Citation:
Assignee:
SHARP KK (JP)
International Classes:
A61B5/08
Domestic Patent References:
| WO2012133931A1 | 2012-10-04 | |||
| WO2007094298A1 | 2007-08-23 |
Foreign References:
| JP2002125953A | 2002-05-08 | |||
| US20120157857A1 | 2012-06-21 |
Other References:
J.GNITECKI ET AL.: "Recursive Least Squares Adaptive Noise Cancellation Filtering for Heart Sound Reduction in Lung Sounds Recordings", PROCEEDINGS OF THE ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, vol. 3, 2003, pages 2416 - 2419, XP010691308, DOI: doi:10.1109/IEMBS.2003.1280403
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (2-6 Tenjinbashi 2-chome Kita, Kita-ku, Osaka-sh, Osaka 41, JP)
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