Synchronisation circuit for optical disc playback - has multiple synchronisation signals used together with PLL to provide operation when information is damaged

The playback system for an optical disc using signal contained within sectors on the disc tracks. Each sector contains a number of synchronisation samples that are used in a phase locked loop circuit. The synchronisation circuit has a PLL stage (16) providing a playback clock signal (REP CLK) and us...

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Bibliographic Details
Main Author IWATANI, YASUYUKI, AMAGASAKI, HYOGO, JP
Format Patent
LanguageEnglish
German
Published 23.12.1993
Edition5
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:The playback system for an optical disc using signal contained within sectors on the disc tracks. Each sector contains a number of synchronisation samples that are used in a phase locked loop circuit. The synchronisation circuit has a PLL stage (16) providing a playback clock signal (REP CLK) and uses an input clock (REF CLK) and a digital signal. The circuit responds to a READ GATE signal generated by a circuit consisting of 3 RS latches (17-19), a counter (8) and a processor (23). The counter provides the necessary timing signals for circuit operation. USE/ADVANTAGE - Provides reliable playback of information even when part of synchronising pattern is damaged, e.g. disc is scratched.
Bibliography:Application Number: DE19934319753