Track crossing detector
US4878136A · kind A · utility
2Cited by
5References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1988 |
| Grant date | Oct 31, 1989 |
| Priority date | — |
| Expiry date | Sep 14, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/083
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for accurately detecting the number of tracks crossed by a reading head during motion thereof across a record medium uses a state machine operation to detect track crossing transitions and to suppress the effect of noise. The head produces a signal which assumes one of four unique states in sequence as successive tracks are crossed. The circuit detects a valid track crossing when a generated next state is the correct next state for a present state indicated by the signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.