Method and apparatus for position and motion sensing
US6477421B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Feb 24, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/1116
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apparatus for extracting activity information and position information from a composite signal generated by a motion sensor includes an analog to digital converter for converting the composite signal from analog to digital format. A wide-band low pass filter having a frequency response of about zero hertz to about ten hertz and a narrow low pass filter having a frequency response of about zero hertz to about 0.5 hertz filter the digitized composite signal. An adder subtracts the output of the narrow-band low pass filter from the output of the wide-band low pass filter. The resulting difference represents information regarding the activity level of the motion sensor, and the output of the narrow-band low pass filter represents information regarding the position of the sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.