Ternary code magnetic recording system
US5621580A · kind A · utility
Inventors
Key dates
| Filing date | Aug 26, 1994 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Aug 26, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10009
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital magnetic recording system comprises an input for a binary-encoded data signal comprising two symbols. The binary signal is converted, using a binary-to-ternary convolutional encoder, to a ternary signal comprising three symbols. The ternary signal is recorded onto a magnetic medium wherein two symbols are recorded using conventional saturation recording and a third symbol is recorded using a nonoriented state. The nonoriented state results from the application to the medium of a high-frequency oscillating magnetic flux. The recorded signal is subsequently reproduced and equalized. A Viterbi algorithm is used to convert the equalized signal back to the original binary signal which is then output from the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.