Method for improving accuracy of pulse rate estimation
US9814400B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 2015 |
| Grant date | Nov 14, 2017 |
| Priority date | — |
| Expiry date | Jan 11, 2036 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/681
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Systems and methods are provided for determining the frequency of a cardiovascular pulse based on a photoplethysmographic measurement of blood in a portion of subsurface vasculature. A plurality of samples of the photoplethysmographic signal are obtained and a frequency spectrum determined based on a first set of the plurality of samples. A frequency is determined based on a maximum frequency component of the frequency spectrum. Further, a confidence level of the determined frequency of the maximum frequency component is determined based on the magnitude of the maximum frequency component and the overall energy in the frequency spectrum. A pulse rate is then determined by updating a predicted pulse rate of a second, earlier set of the plurality of samples based on the frequency of the maximum frequency component and the determined confidence level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.