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Cross-talk cancellation scheme for rll-based storage systems

a storage system and cross-talk technology, applied in power management, instruments, data recording, etc., can solve the problems of system blockage, inability to communicate with each other,

Inactive Publication Date: 2006-08-17
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019] updating means for updating the coefficients of the adaptive filters by minimizing the mismatch between the actual and the expected run length between two transitions of the main signal,
[0023] A second advantage of the proposed minimization scheme is that it can be implemented in an asynchronous architecture without any additional hardware complexity.

Problems solved by technology

This helps to avoid divergence of the filter coefficients but leads to a ramp-up problem: if the time recovery circuit cannot converge because of strong cross-talk, the cross-talk cancellation scheme will remain inefficient and the system will be stuck.
Another problem of the prior art system is that it is hardly compatible with asynchronous receiver architectures.
This would lead to an increased complexity of the architecture.

Method used

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Examples

Experimental program
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Embodiment Construction

[0031] The invention applies to storage media having tracks each forming a 360° turn of a spiral line. Encoded data are recorded along the tracks. The encoding scheme that is used in optical recording system is a Run Length Limited encoding scheme (RLL). When the data recorded along the tracks are encoded with an RLL encoding scheme, the tracks exhibit marks corresponding to runs of a same value, and the edges of a mark correspond to a transition between two runs. The size of the mark corresponds to the length of the run. It is an integer multiple of a reference unit size mark.

[0032]FIGS. 1 and 2 show block diagrams of a first and a second example of an apparatus for reading such a disc. The apparatus shown in FIG. 1 carries reference number 6-1. The apparatus of FIG. 2 carries reference number 6-2. According to FIGS. 1 and 2, the apparatuses 6-1 and 6-2 comprise an optical unit 8 having three reading elements: a main reading element 12 for reading a main signal associated with a m...

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PUM

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Abstract

The invention relates to Run length Limited-codes storage systems. In modern storage systems, the inter-track spacing is chosen to be relatively small to allow for high storage densities. As a result, when reading a target track, data written on side tracks may appear in the recovered signal. This inter-track interference is called cross-talk. The invention proposes a cross-talk cancellation scheme based on the minimization of the mismatch between the actual (dm+1m) and the expected (exp) run length between two transitions (xm, xm+1) of the (dm+1,m) signal. The proposed solution significantly improves the ramp-up properties of the receiver and allows more efficient hardware implementation.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a cross-talk cancellation method, a computer program for implementing a cross-talk cancellation method, a signal processor comprising cross-talk cancellation means, and an apparatus for reading a signal stored along a track on a storage medium, said apparatus comprising cross-talk cancellation means. [0002] The present invention relates to storage systems in which data are stored along tracks on a storage medium. In modern storage systems, the inter-track spacing is chosen relatively small to allow for high storage densities. As a result, when reading a target track, data written on side tracks may appear in the recovered signal. This inter-track interference is called cross-talk. [0003] The invention is advantageously used in such storage systems to improve the recovered signal by removing the cross-talk. For example, the invention applies to optical storage systems (DVD, Blu-ray Disc, Small Form Factor Optical Disc . ....

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G11B7/00H04B7/005H04W52/26H04W52/28H04W52/32H04W52/34H04W52/52
CPCH04W52/26H04W52/286H04W52/32H04W52/343H04W52/346H04W52/52
Inventor PADIY, ALEXANDERYIN, BIN
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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