Unlock instant, AI-driven research and patent intelligence for your innovation.

Control loop for detecting duty ratio of an optical storage medium and related device

A technology of duty cycle and detection device, applied in the field of optical storage

Inactive Publication Date: 2009-06-03
XUESHAN TECH INC
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when setting the cutting level of the push-pull signal by the wave chopper, difficulties are often encountered.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Control loop for detecting duty ratio of an optical storage medium and related device
  • Control loop for detecting duty ratio of an optical storage medium and related device
  • Control loop for detecting duty ratio of an optical storage medium and related device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0052] Certain terms are used in the description and claims to refer to particular components. It should be understood by those skilled in the art that hardware manufacturers may refer to the same component by different terms. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. The "comprising" mentioned throughout the specification and subsequent claims is an open term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

[0053] Please refer to figure 1 , which ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A pre-pit signal generating device includes: a first slicer for generating a sliced signal corresponding to a push-pull signal based on a first reference level; a duty ratio controller coupled to the first slicer for adjusting the first reference level or the push-pull signal to control a duty ratio of the sliced signal to a predetermined ratio; a reference level generator coupled to the duty ratio controller for generating a second reference level corresponding to the first reference level; and a second slicer coupled to the reference level generator for generating a first pre-pit signal corresponding to the push-pull signal based on the second reference level.

Description

technical field [0001] The present invention relates to optical storage technology, especially to a duty cycle ratio control loop and related devices for detecting pre-pit signals or header areas. Background technique [0002] In some recordable optical storage media such as DVD-R, DVD-RW discs, etc., the physical address (physical address) information is recorded in the flat area of ​​the disc in the form of pre-cut pits (pre-pit) (land portion). These pre-pit holes disposed on the land area are also called land pre-pit (LPP). [0003] When writing data into a DVD-R / RW disc or reading data from a DVD-R / RW disc, it is necessary to obtain the physical address information on the disc by detecting the pre-grooved pits in these flat areas . The method of detecting the pre-pit in the land area in the prior art is as follows: firstly, extract a push-pull signal from the DVD-R / RW disc. Then, a slicer is used to slice the push-pull signal according to a preset cutting level to g...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B7/004G11B7/09G11B20/10
CPCG11B7/0912G11B7/00745
Inventor 谢秉谕陈志清
Owner XUESHAN TECH INC