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Method and apparatus for encoding data bits

A data bit and encoding technology, applied in the field of rewritable optical media

Inactive Publication Date: 2005-06-15
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the proposed method is limited to certain optical recording media, and in order to reproduce data stored on such optical recording media, auxiliary devices are required in the reproduction equipment

Method used

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  • Method and apparatus for encoding data bits
  • Method and apparatus for encoding data bits
  • Method and apparatus for encoding data bits

Examples

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Embodiment Construction

[0018] figure 1 A simplified block diagram is shown of an apparatus for encoding according to the invention, preferably for encoding data bits to be encoded and stored on a rewritable CD or DVD. The user data words output by some circuits not shown in the figure (such as an analog-to-digital converter) are encoded by the encoder 1 and provided with error correction performance. Examples of such coders are CIRC (Interleaved Reed-Solomon Code) or RSPC (Reed-Solomon Product Code). The obtained data stream is then input into modulator 2, which is an EFM (8 to 14 modulation) modulator for CD and an EFM plus modulator for DVD, where the data words are mapped onto channel bits .

[0019] In order to realize the (d, k) constraints required in relation to the minimum and maximum operating periods, means 21 for calculating and controlling the numbers and values ​​are provided. In the CD system, data words are mapped onto channel bits by using a conversion table 22 . In the DVD syste...

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Abstract

The present invention relates to a method and a device for encoding data bits of a data bit stream into channel bits of a channel bit stream to be recorded on a rewritable optical medium, wherein the above-mentioned channel bit stream numbers and values (digital sum value: DSV) is controlled. In order to provide encoding methods and devices and optical recording media which do not require any changes in the electronics or software of the reproducing device, it is proposed according to the invention that if a new channel bitstream part is started to be recorded on the recording medium or if an old The channel bitstream part starts to be overwritten in the same memory location on the recording medium, the numbers and values ​​of the above channel bitstream are changed. The method according to the invention is thus also applicable to any existing rewritable optical media.

Description

technical field [0001] The present invention relates to a method and apparatus for encoding data bits of a data bit stream into channel bits of a channel bit stream to be recorded on a rewritable optical medium, wherein the digital sum of the above channel bit stream The value (digital sum value: DSV) is controlled. The invention also relates to a rewritable optical medium storing a channel bitstream encoded according to this method. Background technique [0002] It is well known that rewritable optical media like CD-RW, DVD+RW show aging of the recorded phase change material after repeated write / erase cycles. The number of direct overwrite cycles (DOW) of recording materials used in CD-RW / DVD+RW / DVD-RW has been theoretically estimated and experimentally proved to exceed 1000. [0003] When exactly the same channel bit pattern is written into exactly the same memory location on the recording medium, the performance of DOW suddenly drops. In this case, for example, if info...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/00G11B20/14H03M5/14H03M7/46
CPCG11B20/1426G11B2020/1457H03M5/145H03M7/46G11B20/10
Inventor G·S·斯坦
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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