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Record medium, its recorder, its recording method, its reproducing apparatus and method

A recording device and reproducing technology, which are applied in the directions of optical recording/reproducing, magnetic recording, data recording, etc., can solve problems such as difficulty in practical application of high-density optical discs, and achieve the effect of simplifying processing circuits

Inactive Publication Date: 2007-05-16
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is also difficult to make high-density discs practical

Method used

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  • Record medium, its recorder, its recording method, its reproducing apparatus and method
  • Record medium, its recorder, its recording method, its reproducing apparatus and method
  • Record medium, its recorder, its recording method, its reproducing apparatus and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0307] The magneto-optical disk of Embodiment 1 includes a plurality of data areas, and since data of different numbers of data are recorded in one segment in different data areas, the number of data of certain data 408 is different for each data area.

[0308] The data number of the certain data 408 is at least 2 or more, and if the data number of the certain data 408 calculated by the above formula is 0 or one, then one segment is added to the one ECC block. At the head of the added segment, the last coded data 405 of the preceding segment is recorded, and certain data 408 is written thereafter (the continuation of the fixed data 408 recorded in the previous segment).

[0309] As described above, the recording device encodes one ECC block 401, divides it into a plurality of data blocks recorded in each segment, adds one bit (the number of effective data) data at the head of each data block, and writes data on the optical head When 302 passes through the data recording area, ...

Embodiment 2

[0478] In the magneto-optical disk of Embodiment 1, data 406 (0 in Embodiment 1) and 3-bit pre-coded data specified by 1 bit (the number of valid data bits) are recorded at the head of the coded data of one ECC block. (001 or 010).

[0479] In the magneto-optical disk of embodiment 2, the data 406 (for example being 0) and 3 that one (number of digits of valid data) regulation is recorded at the head of the encoded data of an ECC block and 3 are the last 2 bits of pre-encoded data (01 or 10).

[0480] This is because, in order to decode the first coded data of the coded data of one ECC block, only the last 2 bits (01 or 10) of the 3-bit pre-coded data are required.

[0481] The magneto-optical disk of the second embodiment is the same as the magneto-optical disk of the first embodiment except for this point.

Embodiment 3

[0483] On the magneto-optical disk of Embodiment 1, post coded data 408 is also recorded after the last coded data is recorded in the last segment of one ECC block.

[0484] On the magneto-optical disk of Embodiment 3, in the last segment of one ECC block, no data is recorded after the last coded data is recorded.

[0485] In the magneto-optical disk reproducing apparatus of the third embodiment, when decoding the last coded data, the following processing is performed differently from the usual ones.

[0486] In FIG. 10, when the last coded data is decoded, the last 2 bits of the coded data decoded just before are transferred to D flip-flops 1007 and 1008 through D flip-flops 1004 and 1005, and the last 3 bits of coded data are transferred from D flip-flops 1001~1003 are forwarded to D flip-flops 1004~1006, with certain value 001 (being the value of the input data 2 " rear coding data 1 " column of table 6, by (1-7) decoder 806 storage) are input to D flip-flops 1001-1006.

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Abstract

A recording medium which has a high effective recording density and a high error correcting capability, and a recording apparatus and a reproducing apparatus for the same are provided. The recording apparatus comprises an encoding unit, which encodes input data by an encoding scheme including a run length limit encoding scheme to thereby generate encoded data and divide and output one data stream formed by said encoded data into a plurality of data blocks, and a data adding unit which adds data having the same value as the last one bit of encoded data of said precedent data block to the top of at least one of said data blocks. Using the recording apparatus, in each data recording area of a recording medium which comprises pre-pit areas and a plurality of data recording areas which are divided by said pre-pit areas, a data block which contains said added data is recorded.

Description

technical field [0001] The present invention relates to a recording medium for recording digital data, its recording device, its recording method, its reproducing device and its reproducing method. Background technique [0002] In recent years, various recording formats for recording digital data on recording media have been proposed. [0003] Next, the recording format of a conventional optical disc will be described with reference to the drawings. [0004] Fig. 12 shows a magneto-optical disc with a recording format of the generally used (1-7) encoding method. [0005] Fig. 12(a) is a schematic overall structure of a conventional magneto-optical disk. [0006] In FIG. 12( a ), a magneto-optical disk 1201 includes spiral tracks from the inner circumference to the outer circumference of the magneto-optical disk. [0007] The recording track is divided into a plurality of data recording areas 1202 by a pre-pit area (header area) 1203 extending in the radial direction of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/14G11B20/10G11B20/12G11B7/007G11B11/105G11B7/00G11B27/34H03M5/14
CPCG11B20/1217G11B20/10212G11B7/00745G11B20/10009G11B20/1426G11B2020/1287G11B20/1403G11B20/10055G11B2220/2525G11B27/34G11B20/1258H03M5/145G11B7/00G11B2020/1222G11B20/10
Inventor 日野泰守弓田昌平井上貴司橋本清一
Owner PANASONIC CORP
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