Modulation model of photoplethysmography signal for vital sign extraction
US12364439B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 4, 2021 |
| Grant date | Jul 22, 2025 |
| Priority date | — |
| Expiry date | Nov 14, 2043 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/7225
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apparatus for vital sign extraction. The apparatus may receive a vital signal of a subject from a sensing device. The apparatus may also perform a preprocessing procedure on the vital signal via bandpass filtering and normalization to obtain a preprocessed signal. The apparatus may also perform a time-frequency analysis of the preprocessed signal, and estimate a heart rate of the subject from a dominant component of the preprocessed signal by finding location of a maximum spectral energy of the time-frequency analysis. In addition, the apparatus may identify guard components in the preprocessed signal in view of the dominant component, and derive a respiratory rate of the subject from a length of an interval between the dominant component and each of the guard components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.