System for reliable digital recording on unreliable magnetic media
US4916294A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1988 |
| Grant date | Apr 10, 1990 |
| Priority date | — |
| Expiry date | Jul 25, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K5/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for reliably recording digital data on marginal magnetic recording medium by utilizing a two-track format and testing to locate pairs of record-quality areas of the medium. A magnetic stripe on a document is defined into a pair of recording tracks each with a sequence of bit locations. Associated pairs of bit locations (one from each track) are jointly tested for recording quality. One bit location of poor quality eliminates the pair; however, if both bit locations meet a standard, they are employed cooperatively to record data. Specifically, each bit location initially is recorded with a pulse. Any pair of bit locations which cannot meet the standard is totally cleared (erased), while pairs of bit locations meeting the standard are selectively erased to represent digital data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.