Acoustic occupancy sensor
US7777632B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 6, 2006 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Mar 14, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An acoustic occupancy sensor includes and acoustic transmitter, acoustic receiver, variable bandpass filter and a controller. The acoustic transmitter transmits acoustic signals into a defined region and the acoustic receiver receives acoustic signals from the defined region. The received acoustic signal is converted to an electrical signal. A pre-amplifier amplifies the electrical signal and the electrical signal is digitized. The digitized electrical signal is demodulated by a demodulator to remove the carrier signal. The digitized electrical signal is filtered by a bandpass filter that sweeps up along a range of frequencies and down along a range of frequencies. The amplitudes of the filtered signals are averaged and analyzed to determine the presence or absence of an occupant within the defined region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.