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Method and apparatus for evaluating recording information and information recording medium thereof

A technology for recording information and evaluation methods, which is applied in the directions of recording information storage, optical recording/reproduction/erasing methods, recording signal processing, etc., and can solve problems such as difficulties

Inactive Publication Date: 2007-07-25
TOSHIBA SAMSUNG STORAGE TECH KOREA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to prepare the correct address information, one needs to know which part of the disc is currently being read from using some method; however, this is very difficult

Method used

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  • Method and apparatus for evaluating recording information and information recording medium thereof
  • Method and apparatus for evaluating recording information and information recording medium thereof
  • Method and apparatus for evaluating recording information and information recording medium thereof

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Embodiment Construction

[0042] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0043] [Basic description of optical disc devices]

[0044] The optical disc device of the present invention performs recording or reproduction of information by focusing laser light emitted from a pickup head (PUH) 12 onto an information recording layer of an optical disc 11 . The configuration of an optical disc device is illustrated in FIG. 1 . Light reflected from the optical disc 11 passes through the optical system of the PUH 12, and enters a photodetector (PD) unit 13, where it is detected as an electrical signal.

[0045] PD 13 is divided into two or more parts. A signal generated by adding voltage values ​​output from the respective sections is called a sum signal. The signal resulting from the difference between the voltage values ​​is called a difference signal. In particular, a signal to which a radio frequency signal such as user informa...

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Abstract

From an optical disc on which physical address information is recorded in the form of phase modulation of a groove wobble, a wobble signal is optically obtained which is affected by the groove wobble. The wobble signal is phase detected by a phase detector (32) and then fed into a low-pass filter (34). In a jitter calculator (51) the value of / T is calculated from the standard deviation of a jitter distribution obtained from the output of the low-pass filter and the period (T) of a symbol clock for the phase modulation to evaluate the recorded physical address information.

Description

technical field [0001] The present invention relates to a method and apparatus for evaluating a recording medium and an information recording medium thereof. The present invention is useful in evaluating information recorded on optical discs such as digital versatile discs (DVD). Background technique [0002] As is well known, an optical disc having a single-layer capacity of 4.7 GB on one side and allowing high-density recording of information has come into practical use in recent years. Such discs include DVD-ROM as a playback-only disc and DVD-RAM, DVD-RW and DVD+RW as rewritable discs. [0003] With these optical discs, recording and reproduction of information is performed by focusing laser light on an information recording layer formed on a transparent plate. The information recording layer of the optical disc has guide grooves. Recording or reproduction of information is performed along the guide groove. In order to identify a spatial location where information is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B7/005G11B7/004G11B7/007G11B20/10G11B20/14G11B27/19G11B27/24G11B27/36
CPCG11B20/1403G11B2220/2575G11B27/24G11B20/10009G11B7/007G11B2220/2562G11B27/36G11B7/24082G11B2220/216B60H1/00028B60H2001/006B60Y2306/09
Inventor 长井裕士小川昭人能弹长作
Owner TOSHIBA SAMSUNG STORAGE TECH KOREA CORP
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