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Run length ratio modulating data recording method and system

A run-length, data recording technology, applied in the direction of digital recording/reproduction, electrical components, code conversion, etc., can solve the problems of decreasing signal-to-noise ratio, the resolution of run-length cannot be infinitely improved, etc., to enhance the signal-to-noise ratio, increase the bit rate effect

Active Publication Date: 2014-11-26
TSINGHUA UNIV
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitation of the clock recovery of the readout system, the resolution of the run length cannot be infinitely improved, and due to the limitation of the readout system, the excessively subdivided run length will face the pressure of rapidly decreasing signal-to-noise ratio

Method used

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  • Run length ratio modulating data recording method and system

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Embodiment Construction

[0021] The run length ratio modulation data recording method and system proposed by the present invention will be described in detail with reference to the accompanying drawings and embodiments.

[0022] For better understanding of the present invention, do as follows:

[0023] In order to ensure correct clock recovery of the readout signal, a Phase Locked Loop (Phase Locked Loop, PLL) technology is generally used. In the phase locking process, phase feedback with a fixed multiple is required, and the zero-crossing point of the signal is generally taken, and the zero-crossing point position is an integer multiple of the least common multiple. In the traditional RLL modulation, the change position of the signal ("0" to "1" and "1" to "0") is generally taken as the sampling point of the loop feedback. In the run length ratio (Run-Length-Rate, RLR) modulation of the present invention, only set the position (as " 0 " change " 1 "; Or " 1 " change " 0 " ) as the sampling point of...

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Abstract

The invention discloses run length ratio modulating data recording method and system. The method comprises the following steps of: S1, carrying out run length modulation on a data sequence to be recorded to generate a run length modulating sequence; S2, keeping a run of the run length modulating sequence and carrying out run length ratio modulation on the sequence in the run to generate a run length ratio modulating sequence; S3, synthesizing the sequences generated by the steps S1 and S2, carrying out direct-current control modulation to the sequences and outputting a run sequence; and S4, forming a data recording mark according to the run sequence. According to the method and the system disclosed by the invention, a non-dimensional ratio signal is recorded in a microcosmic region, the signal to noise ratio of the system is enhanced and the recovering of clock signals is not influenced; a subdividing number of the run ratio is increased so that the code ratio of modulation encoding can be increased under the same condition; and the subdividing resolution ratio is only related to a medium property and a read-out signal processing capability.

Description

technical field [0001] The present invention relates to the technical field of digital storage, in particular to a data recording (Run-Length-Rate, RLR) method of an optical disk or a hard disk and a system thereof. Background technique [0002] The modulation codes used in traditional digital storage products (such as optical discs and magnetic disks) are binary run-length-limited (RLL (d, k)) modulation codes. Among them, d and k mean that the number of 0s between two adjacent 1s is at least d, and at most no more than k. For example, a CD uses an RLL (2, 11) eight-to-fourteen modulation (Eight-to-Fourteen Modulation, EFM) code with a code rate of 8 / 17, and a DVD uses an 8 / 16 RLL (2, 11) EFM+ code. In the above digital storage products, user data is represented by changes in the microscopic form of the record. In traditional digital storage products, user data is expressed as a modulated binary data sequence by changing the length of the record. [0003] In the run-leng...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/10H03M7/46
Inventor 徐海峥裴京潘龙法陆达倪屹
Owner TSINGHUA UNIV