Method of detecting defects in signals corresponding to the read-out of a data carrier and system for implementing such a method
US4006295A · kind A · utility
5Cited by
9References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1975 |
| Grant date | Feb 1, 1977 |
| Priority date | — |
| Expiry date | Jul 21, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/94
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method of detecting defects in the signal furnished by the head used to read-out information recorded upon a data carrier. The read-out signal is converted by two voltage comparators whose thresholds are respectively lower and higher than the mean peak amplitude of the carrier signal in two squarewave signals which, applied to an assembly of monostable switching circuits associated with logic gates, are responsible for the production of a defect signal capable of controlling a defect correcting circuit, which is fed with the read-out signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.