Method of detecting defects in read out signals, and apparatus for implementing the same
US4017895A · kind A · utility
6Cited by
9References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1975 |
| Grant date | Apr 12, 1977 |
| Priority date | — |
| Expiry date | Jul 21, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method and apparatus for detecting defects in signals produced by the read-out of information recorded upon a data carrier. The defects correspond either to an abnormally high frequency or to an abnormally low frequency. Detection is achieved by means of one, two or three monostable switching circuits supplied with trigger pulses originating from squared read-out signals. The signal produced by the last monostable switching circuit is used for controlling a defect correcting circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.