Sony Corporation

Tomohiro Ohama

Kenichi Hayashi

Masaki Endo

Junkichi Sugita

Nobuyuki Asai

A frequency control device capable of detecting a frame sync pattern and generating a frequency information accurately even if a reproduction signal is not zero-crossed, and an information reproduction apparatus having the same, which includes an oscillation circuit outputting a clock having a frequency corresponding to a control signal; a converter sampling an input analog signal having a predetermined pattern based on the clock and converting the same to a digital signal; and a frequency detection device detecting an object to be a sync pattern from a changing trend of the digital signal, generating a frequency information for controlling a reproduction clock based on the detected object to be the sync pattern, and outputting the same as the control signal to the oscillation circuit.

Frequency control device and information reproduction apparatus

The present invention relates to a reproducing apparatus which, in a case where a burst error has occurred, corrects an error preceding a synchronization pattern detected thereafter to have less errors. A bit slip judging sectionin a bit slip correcting sectioncalculates a bit slip correction amount and a bit slip correction position on the basis of phase error signals detected by a phase error detecting section, synchronization pattern signals detected by a synchronization detecting section, reproduced clocks and detected data. A FIFO control sectioncontrols a FIFO bufferon the basis of the bit slip correction amount and the bit slip correction position, to perform bit slip correction. As a result, in the case where a burst error has occurred, an error preceding a synchronization pattern detected thereafter is corrected, whereby an error reduction can be implemented. The present invention is applicable to a reproducing apparatus.

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Kanagawa, Japan

Tomohiro Ohama