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Two-dimensional run length constrained codec with protected words and its usage method

A two-dimensional run length and codec technology, applied in the field of data storage, to achieve the effect of simple structure

Inactive Publication Date: 2011-12-28
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, for the aforementioned improved frequency modulation code (MFM), the internal constraints between the data will change accordingly due to the change of the spatial scale from one-dimensional to two-dimensional. The constraints that were originally satisfied under the one-dimensional condition are limited to the two-dimensional situation. no longer valid

Method used

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  • Two-dimensional run length constrained codec with protected words and its usage method
  • Two-dimensional run length constrained codec with protected words and its usage method
  • Two-dimensional run length constrained codec with protected words and its usage method

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Embodiment 1

[0104] Figure 10 The specific encoding process is given. The one-dimensional data stream is first divided into several data packets of equal length. The length of the data packet is determined according to the size of the two-dimensional array. In this embodiment, because the size of the two-dimensional array is equal to 8×8, the data of each group includes 16 bits. into 8 words, that is, each group of data includes 8 2-bit words. Then these 8 one-dimensional data words are encoded according to the encoding rules in Fig. 6(a). The coding rules are as follows: After the above-mentioned 8 one-dimensional data words are encoded into eight 2×2 two-dimensional constraint code words, they are written into the two-dimensional array line by line along the odd-numbered lines of the two-dimensional word unit page through the two-dimensional array writing module. The entered two-dimensional array is as follows:

[0105]

[0106] When the writing of the two-dimensional con...

Embodiment 2

[0109] Figure 11 The specific decoding process is given. A two-dimensional data array is first read from a two-dimensional recording device. In this embodiment, the 8×8 two-dimensional data array is as follows:

[0110] 0 1 0 1 0 0 0 1 0 0 1 0 0 0 1 0 0 1 0 1 0 1 ...

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Abstract

The invention provides a codec with a protection word and a limited and restrained two dimension run length and an application method thereof. The codec comprises: an encoder and a decoder. The encoder comprises: a data buffer and packet module, a two dimension code word generation module, a two dimension word unit page structure module, a two-dimension code-word write-in array module and a protection word filling module. The above five modules are successively connected and are output to a two dimension data recording apparatus through the protection word filling module. The decoder comprises: a two dimension data buffer module, the two dimension word unit page structure module, a one-dimensional data word decoding module and a one-dimensional data flow assembly module. The above five modules are successively connected and are output through the one-dimensional data flow assembly module. By using the encoding and decoding method and the apparatus of the invention, two dimension (1, 3) RLL technology problem that the two dimension data array formed by 0 and 1 satisfies a (1, 3) RLL constraint in two directions can be solved.

Description

technical field [0001] The invention belongs to the fields of data storage and communication. Specifically, when storing binary data on a plane composed of rectangular grids, whether in the horizontal direction or in the vertical direction, between continuous data "1", the run length of data "0" is at least equal to 1, and at most not More than 3 codecs and how to use them. Background technique [0002] In modern storage technology and communication technology, due to the inherent physical characteristics of the channel, there will be some form of constraints on the signal passing through the channel. In order to reduce the impact of the channel on the signal and improve the reliability of the storage system and communication system, one of the ways to solve this problem is to use constraint coding technology, which is also called modulation coding. The (d,k) run-length-limited constraint (RLL) is a typical representative of this type of constraint. Here d represents the ...

Claims

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Application Information

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IPC IPC(8): G11B27/031
CPCG11B27/031H03M7/46H03M5/145
Inventor 刘继斌
Owner WUHAN TEXTILE UNIV
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