Ultrasonic occupant detection and classification system
US6932769B2 · kind B2 · utility
20Cited by
4References
20Claims
0Family size
Assignee
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Key dates
| Filing date | May 28, 2003 |
| Grant date | Aug 23, 2005 |
| Priority date | — |
| Expiry date | Oct 2, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG16H50/20
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An ultrasonic occupant detection and classification system transmits an ultrasonic signal and receives a composite signal containing interference created between the transmitted ultrasonic signal and a reflection of that signal from a moving occupant. A signal component of the received, composite signal is extracted by amplitude demodulation and bandpass filtered to derive a frequency characteristic that is compared to stored frequency data; and the derived and stored data are compared to identify frequencies characteristic of respiration and/or other movements characteristic of living beings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.