Data collecting device and method

Abstract

The invention relates to a data collecting device and method. The data collecting device comprises a signal processing unit, a frequency locking circuit and a matching circuit. The signal processing unit converts a radio frequency signal into a return-to-zero signal. The frequency locking circuit estimates the minimum interval length according to the return-to-zero signal in multiple detection periods, and generates an enable signal according to the minimum interval length and the return-to-zero signal. The frequency locking circuit confirms whether to correct the enable signal or not according to distribution of multiple enable pulses in the enable signal, and accordingly generates a sampled signal. The matching circuit samples the return-to-zero signal according to the sampled signal, and generates a synchronous signal according to a sampling result. Besides, the matching circuit generates a composite synchronous signal through a virtual signal and the synchronous signal. Multiple row data are collected from the return-to-zero signal through the composite synchronous signal.

Description

technical field [0001] The present invention relates to a data collection device and its method, and in particular to a data collection device and its method for collecting row data in a group cut area. Background technique [0002] Since piracy of digital versatile discs (Digital Versatile Disc, referred to as DVD) is very prevalent, copying will be restricted in discs with a content protection for recordable media (Content Protection for Recordable Media, referred to as CPRM) mechanism, To prevent unlicensed videos and content from being copied. Generally speaking, a burst cutting area (BCA) on an optical disc is an area where copyright-related information is recorded, and it records necessary information for decoding the content of the optical disc. [0003] for example, figure 1 It is a schematic diagram corresponding to the structure of the group cut area in the specification of the optical disc. Such as figure 1 As shown, each row has 5 groups of bytes, and the fir...

AI Technical Summary

Problems solved by technology

However, when the four sync bodies whose sync identification code is 0001 or all are damaged or scratched by stains, although the row data in the group cut area is not damaged or scratched, this method will still fall into recursion Difficulties in searching for synchronous ontologies indefinitely, so that the decoding process cannot be started

In addition, when the synchronization body whose synchronization identification code is 1111 is damaged or scratched, this method will not end the decoding process

That is to say, when the synchronization bodies whose synchronization identification codes are 0000 and 0001 are damaged or scratched by stains, this method will not be able to carry out the decoding process smoothly

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