Angle digitizer with enhanced harmonic rejection
US4754259A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1987 |
| Grant date | Jun 28, 1988 |
| Priority date | — |
| Expiry date | Mar 11, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/34
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A device for converting time varying signals which represent sin .theta. and cos .theta. of an angle .theta., where can take on values over a range, to an n bit digital signal. The range is typically 2.pi. radians and is segmented into 2.sup.n+1 -4 segments. The segments are mapped into 2.sup.n -1 amplitudes, and are encoded as the n bit digital signal. The invention is particularly useful as an angle digitizer where .theta. represents the phase difference between an input signal and a reference signal. As an angle digitizer, harmonic rejection is enhanced by the efficient use of the n bits to distinguish amplitude states as opposed to distinguishing merely phase states.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.