Synchronizing signal detecting circuit
First Claim
1. A synchronizing signal detecting circuit for digital data reproducing apparatus comprising:
- reproducing means for deriving digital signals from a storage medium;
phase locked loop means connected to said reproducing means for generating clock signals based on said derived digital signals;
synchronizing counter means for generating synchronizing timings by counting said clock signals;
a plurality of synchronizing pattern detecting means connected to said reproducing means for detecting synchronizing patterns included in said digital signals; and
logic circuit means connected to said plurality of synchronizing pattern detecting means for supplying an initialize pulse to said synchronizing counter means upon detecting successive synchronizing patterns in said digital signals at said plurality of synchronizing pattern detecting means.
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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.
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Citations
10 Claims
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1. A synchronizing signal detecting circuit for digital data reproducing apparatus comprising:
- reproducing means for deriving digital signals from a storage medium;
phase locked loop means connected to said reproducing means for generating clock signals based on said derived digital signals;
synchronizing counter means for generating synchronizing timings by counting said clock signals;
a plurality of synchronizing pattern detecting means connected to said reproducing means for detecting synchronizing patterns included in said digital signals; and
logic circuit means connected to said plurality of synchronizing pattern detecting means for supplying an initialize pulse to said synchronizing counter means upon detecting successive synchronizing patterns in said digital signals at said plurality of synchronizing pattern detecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- reproducing means for deriving digital signals from a storage medium;
Specification