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Periodic time self-adapting repeat controller used for blue-light high-density optical disk servo-system

A repeating controller and servo system technology, applied in the direction of optical recording/reproduction, instrument, head configuration/installation, etc., can solve the problems that cannot fully meet the servo accuracy requirements of high-density optical disc systems, and achieve improved accuracy Effect

Inactive Publication Date: 2011-09-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the traditional phase correction control method has certain limitations in the coordination of gain and bandwidth, it can no longer fully meet the requirements of high-density optical disc systems for servo accuracy.

Method used

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  • Periodic time self-adapting repeat controller used for blue-light high-density optical disk servo-system
  • Periodic time self-adapting repeat controller used for blue-light high-density optical disk servo-system
  • Periodic time self-adapting repeat controller used for blue-light high-density optical disk servo-system

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Embodiment Construction

[0029] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] figure 1 is a structural diagram of a period adaptive superimposed repetitive controller according to the present invention, which includes the following steps:

[0032] Step 101, the extracted servo error e(s) passes through a repeating compensator link C r (s), the periodic component in the error signal is suppressed, and U(s) is obtained;

[0033] Step 103, U(s) is used as the input signal of the phase correction link C(s), and the signal characteristics meeting the requirements are obtained by adjusting the frequency characteristics;

[0034]...

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Abstract

A period self-adapted repeat controller adapted to various CD servo systems, especially adapted to blue light high-density CD system, is disclosed. A repeat controller is overlaid to a traditional phase correction controller in CD servo system, and the cut-off frequency of a low-pass filter in the repeat controller is reasonably designed to ensure the stability of the system. The link self-adapted CD rotation period can correct the link of delayed period of the repeat controller in real time. The repeat controller can be continuously, stably and effectively used in CD servo system.

Description

technical field [0001] The present invention relates to the field of digital storage and servo control, more specifically, to a novel servo control method for Blu-ray high-density storage devices (such as HD-DVD, Blu-ray and Blu-ray multi-level discs). Background technique [0002] During the working process of the optical disc, the focused light spot should always be scanned along the track of the record on the information recording surface, and the original high-frequency signal can be obtained by detecting the reflected light field modulated by the record, and then after equalization, detection, demodulation and error correction to recover the recorded information. However, the shaking, axial runout, and inclination introduced by the installation of the optical disc when the disc rotates at high speed inevitably make the information recording surface of the disc exceed the focal depth range of the focused beam during the working process, resulting in defocusing, and , di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/09G11B7/095
Inventor 倪屹沈全红潘龙法裴京徐海峥熊剑平
Owner TSINGHUA UNIV