System and method for generating band-limited quasi-sinusoidal signals
US6031218A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1999 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Mar 8, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03549
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for generating quasi-sinusoidal signals includes illuminating an object capable of reflecting light, focusing a portion of the reflected light on a multi-element detector to form an image, and matching the image size to the size of the detector elements. A first weighted sum of signals generated by a first set of elements produces an in-phase signal, and a second weighted sum of signals generated by a second set of elements produces a quadrature signal. Weights are signed quantities selected to exhibit a band-pass behavior in the spatial frequency domain, thereby attenuating noise generated by, for example, non-uniform surface reflectance and non-uniform illumination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.