Digital high-pass filter for a displacement detection device of a portable apparatus
US7783449B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2007 |
| Grant date | Aug 24, 2010 |
| Priority date | — |
| Expiry date | Aug 5, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P15/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A digital high-pass filter has an input, an output, and a subtractor stage, having a first input terminal, a second input terminal and an output terminal. The first input terminal of the subtractor stage is connected to the input of the digital high-pass filter and the output terminal is connected to the output of the digital high-pass filter. A recursive circuit branch is connected between the output of the digital high-pass filter and the second input terminal of the subtractor stage. Within the recursive circuit branch are cascaded an accumulation stage, constituted by an integrator circuit, and a divider stage. The cutoff frequency of the digital high-pass filter is variable according to a dividing factor of the divider stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.