Synchronizing signal detecting circuit
US4719523A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1986 |
| Grant date | Jan 12, 1988 |
| Priority date | — |
| Expiry date | Apr 30, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/935
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A synchronizing signal detecting circuit for a digital data reproducing apparatus has a reproducing device connected to a magnetic head which scans a recording medium for deriving digital signals, a phase locked loop circuit connected to the reproducing device for generating a clock signal based on the derived digital signals, a synchronizing counter for generating synchronizing timings by counting the clock signal, a plurality of synchronizing pattern detecting circuits connected to the reproducing device for detecting synchronizing patterns included in the digital signals, and a logic circuit connected to the plurality of synchronizing pattern detecting circuits for supplying an initialize pulse to the synchronizing counter upon detecting successive synchronizing patterns in the digital signals by the plurality of synchronizing pattern detecting circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.