Time sequence recovery device and method with protection function

Abstract

The timing resuming device and method with protecting function uses for one CD (Compact Disc) reading system. When the timing character is good, it counts by frequency estimator and store proper frequency estimated value as scheduled frequency estimated value and detect whether the CD reading system read the CD area with vice by vice detector. If it finds vice, store the scheduled frequency estimated value as basement of frequency locked and phase locked to produce referenced timing. When it gets right, restart natural frequency locked mechanism to lock input signal in shorter time. It can greatly reduce the dropping of readable data for frequency doffed and break the action about normally tracking frequency of frequency locked mechanism.

Description

Technical field [0001] The present invention relates to a timing recovery (timing recovery) device, in particular to a timing recovery device and method applied to a compact disk (CD) reading system. Background technique [0002] Optical storage media such as optical discs, digital video disks (DVD) and high-definition DVDs (high-definition DVD) often have scratches or contamination defects, even fingerprints on the disc, Abnormal optical disc production and burning may also affect the frequency and phase of the read input signal (radio frequency signal), causing the frequency of the reference timing generated by the timing recovery device to be unstable, which makes the optical drive The decoding device may miss a lot of readable data. [0003] In 1993, Gardner ("Interpolation in Digital Modems-Part I: Fundamentals", IEEE Trans.on Communications, vol.41, no.3, March 1993) proposed a timing recovery device that uses a feedback loop Operation, the frequency and phase of the input ...

AI Technical Summary

Problems solved by technology

The above problems make the digital PLL unstable and inefficient

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