Magnetic recording system with pulse qualification and error correction circuitry
US5384790A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1993 |
| Grant date | Jan 24, 1995 |
| Priority date | — |
| Expiry date | Oct 22, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/31
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Special tape drive read circuitry generally qualifies read voltage peaks by establishing a minimum amplitude for valid peaks in the read voltage signal so that noise is not interpreted as peaks, but does not require amplitude qualification during periods of dropout in the read voltage signal. Additional circuitry recognizes two of the data errors most common to GCR, and allows for these errors to be corrected. The first kind of error is the tri-bit error, in which 01110 is misinterpreted as 01000. The other kind of error is the low frequency error, in which 10010 is misinterpreted as 11000. Also, the type of error detected is used to adjust the read drive's hysteresis setting, to reduce future errors of the same type.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.