Arousal-level determining apparatus and arousal-level determining method
US9801579B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2014 |
| Grant date | Oct 31, 2017 |
| Priority date | — |
| Expiry date | Oct 19, 2034 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2503/22
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An arousal-level determining apparatus includes a generating unit, a calculating unit, an identifying unit, and a determining unit. The generating unit generates heartbeat-interval variation data, which indicates changes in heartbeat interval, on the basis of heartbeat signals indicating subject's heartbeats. The calculating unit applies a band-pass filter, which allows passage of a certain range of frequencies, to each frequency band in the heartbeat-interval variation data while changing the frequency band, and calculates spectral density with respect to each frequency band applied with the band-pass filter. The identifying unit identifies a feature point corresponding to a spectral density peak in the calculated spectral densities in the frequency bands. The determining unit determines subject's arousal level on the basis of the identified feature point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.