Drop-out location detection circuit
US5627846A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 19, 1995 |
| Grant date | May 6, 1997 |
| Priority date | — |
| Expiry date | Apr 19, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1833
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital data reproducing circuit for use with a magnetic or optical data storage for detecting and flagging signal level drop-outs in pulse position modulated (PPM) recorded signal levels. Positive and negative peak amplitudes of a self-clocking PPM coded signal are compared to positive and negative valid information peak detectors to detect the clock and PPM data. Lower peak (in absolute terms) amplitudes that fall from the normal signal levels at the start of a drop-out and/or rise at the end of the drop-out, are detected by positive and negative drop-out peak detectors. The positive and negative drop-out peak detectors are inhibited when valid clock and data peak pulses are detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.