Interface between threshold processing digitizer for bar code reader
US6082621A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1994 |
| Grant date | Jul 4, 2000 |
| Priority date | — |
| Expiry date | Nov 9, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10851
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A multi-bit digitizer (30) for a barcode reader detects the presence of edges of a scanned barcode symbol, and also measures the strength of each detected edge. A polarity or edge direction signal (8) indicates the direction of each detected edge, and a timing signal (6) is representative of the timing and also, by means of a variable pulse width, the strength of each edge. A gating signal (200) indicates that the data are unreliable and invalid if the measured voltage applied to the scanner motor of the barcode reader is higher or lower than defined limit values. Any scans made at a speed which were too high or too low are rejected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.