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Multi-order recordable CD of run-length limiting and making method thereof

A run-length, optical disc technology, used in magnetic recording, data recording, optical record carriers, etc., can solve problems such as inter-symbol crosstalk affecting sequences, achieve large compatibility, increase storage capacity and data transmission rate, and reduce order. desired effect

Inactive Publication Date: 2005-10-26
TSINGHUA UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The parameter d controls the highest transmission frequency and thus may affect the intersymbol interference when the sequence is transmitted over a band-limited channel

Method used

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  • Multi-order recordable CD of run-length limiting and making method thereof
  • Multi-order recordable CD of run-length limiting and making method thereof
  • Multi-order recordable CD of run-length limiting and making method thereof

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Experimental program
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Embodiment

[0040] Specifically introduce content of the present invention by embodiment, but content of the present invention is not limited to described in embodiment:

[0041] According to the multi-stage recordable optical disc technology with limited run length proposed by the present invention, we have designed a 4-stage RLL recordable optical disc, the schematic diagram of which is shown in the appendix Figure 6 , 7 . First, the binary sequence generated by binary user data is input to the 4th-order RLL modulation encoder to generate a 4th-order (d, k) sequence, here we select (d=2, k=10).

[0042] This sequence generates the write waveform for controlling laser engraving through [a(n-1)+b(n)]mod 4=a(n) operation, where a(n) is the write level of the nth sequence, b (n) is the nth data in the 4-order RLL sequence, and M is the order number of the multi-order optical disc. For example, the level a(4) of the 4th sequence of the written waveform in the figure is 0, while the 5th d...

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Abstract

1A multi-stage record disk with limited travel lengths and its manufacturing method characterizes that the width of the recording symbol on said multi-stage record disk is multi-stage and decided by recorded laser power, at the same time, the travel length is limited, there are d 'o' at the least and k 'o' at the most between two non-o data, parameters d, k decide the smallest and largest travel lengths possibly appearing in the channel series determined by the exposing time for caving and recording lasers. A manufacture method is disclosed including multi-stage addition record disk of dye material or multi-stage duped disk of phase change or magneto-optic material, which obviously increases the storage volume of record disks and data transmission rate.

Description

technical field [0001] A multi-stage recordable optical disc with limited run length and its manufacturing method belong to the technical field of recordable optical discs. Background technique [0002] Existing digital disc products convert information into binary numbers, and correspond the binary data to two different physical states of the record symbols of the storage medium in a certain modulation method to realize data storage. This type of storage method is called binary storage. The current recordable disc storage technology adopts the binary storage method, and judges whether the current corresponding position is "mark" (Mark) or "space" (Space) according to the magnitude of the reflected light intensity. Two state numbers can be recorded on the unit, that is, exactly one bit (bit) of information (1 at the signal transition and 0 at other positions). [0003] Multi-level storage technology is proposed relative to binary storage. If the data stream is modulated i...

Claims

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Application Information

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IPC IPC(8): G11B7/24097G11B20/10
Inventor 徐端颐倪屹潘龙法陈垦熊剑平陆达胡恒马建设裴京张启程胡华宋洁
Owner TSINGHUA UNIV
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