Analog signal manipulation using charge transfer techniques
US4159432A · kind A · utility
4Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1977 |
| Grant date | Jun 26, 1979 |
| Priority date | — |
| Expiry date | Nov 30, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/28
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Analog voltage levels derived from optically scanning a document or from magnetically scanning a magnetic record, depend upon the variable amplitude of a background signal. The analog voltage levels are processed by a bucket brigade circuit to set a threshold from which a binary decision may be made as to the presence of a black or white indicium in optical recognition or a one (1) or zero (0) bit in magnetic reading.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.