Method of detecting noise in auscultatory sound signals of a coronary-artery-disease detection system
US11045163B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2018 |
| Grant date | Jun 29, 2021 |
| Priority date | — |
| Expiry date | Jul 11, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/0364
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A time-series array of noise data is generated from an inverse frequency transform of the product of the frequency spectrum of an auscultatory sound signal with an associated noise filter generated responsive to a cross-correlation of frequency spectra of auscultatory sound signals from adjacent auscultatory sound-or-vibration sensors on the torso of a test subject. Noise power within at least one range of frequencies of average of frequency spectra from a plurality of windows of the time-series array of noise data is compared with a threshold to determine whether or not the associated auscultatory sound-or-vibration sensor is excessively noisy. In one embodiment, the noise filter is generated by subtracting from unity, a unity-normalized cross-correlation of frequency spectra of the auscultatory sound signals, wherein the resulting values are clipped so as to be no less than an associated noise floor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.