Data checking device and method for high-density CD permanent information and control data area

Abstract

A data detection device and method for the permanent information and control data area of ​​a high-density optical disc, the device includes: identifying the recording mode of the high-frequency modulation groove after bi-phase modulation in a specific area of ​​the optical disc lead-in area, An optical pickup unit that generates signals related to this; an analog / digital converter that samples and quantizes the identified high-frequency modulation signal; a phase shift detector that uses the sign of the sampled value to determine whether there is a phase shift ; A cyclic adder that performs continuous addition processing on the sampled values; detects the length of the groove pattern included in the identified high-frequency modulation signal, and generates a groove length detector for the cyclic value of the cyclic adder; shifts in phase When the detector detects a phase shift, it detects the bit string recorded in the high-frequency modulation groove. The present invention regenerates the high-frequency modulation bit data of the high-density optical disc only by using a simple loop adder.

Description

technical field [0001] The present invention relates to a data detection device and method for a permanent information and control data (PIC: Permanent Information & Control data, hereinafter referred to as PIC) area in a high-density reproduction special optical disk, especially relates to a recording / reproduction system for a high-density optical disk, using high A restoration method of HFM characteristic data in which information is recorded in the PIC area in the lead-in area of ​​a density disc by a high-frequency modulation (HFM) groove method. Background technique [0002] Recently, for a new type of high-density re-recordable optical disc capable of recording and storing high-quality video data and high-quality audio data for a long period of time, see below Figure 1-Figure 5 , the structure of an ordinary optical disc capable of repeated recording will be described. figure 1 It is a structural schematic diagram of an ordinary optical disc (BD-RW) capable of repeat...

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Problems solved by technology

[0012] Although this method of using PLL is very common, since it is necessary to design a frequency corresponding to the HFM groove to be used together with the PLL used to recover the data in the data area, there is a need to additionally use all the resources for common use. Issues with required preprocessing logic

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