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 invention relates to a 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 compact discs, digital video discs (digital video discs, DVDs) and high-definition digital video discs (high-definition DVDs) often have scratches or contamination defects on the surface, and even fingerprints on the discs, Abnormal disc production and burning may also affect the frequency and phase (phase) of the read input signal (radio frequency signal), resulting in unstable frequency of the reference timing generated by the timing recovery device, making the optical drive The decoding device has the potential to 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, using the feedback loop (fee...

AI Technical Summary

Problems solved by technology

The above problems make the digital PLL unstable and inefficient

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