Bit recovery scheme for an asymmetric data channel

A data channel, asymmetrical technology with applications in data logging, modification of read/write signals, signal processing using self-timed codes, etc.

Inactive Publication Date: 2005-02-02
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, some approximations only consider the direction (+ or -) of the error signal ε

Method used

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  • Bit recovery scheme for an asymmetric data channel
  • Bit recovery scheme for an asymmetric data channel
  • Bit recovery scheme for an asymmetric data channel

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Embodiment Construction

[0027] Figure 4 A solution according to the invention is shown, using an equalizer with a single filter but with two sets of coefficients. Instead of an FIR filter, a polynomial filter (Volterra filter) reduced to an additive DC and a multiplier to create quadratic filter states is used. The algorithm representing a nonlinear filter can be expressed by the following Equation 1 (simplified to):

[0028] the y k =h 0 + h 1 (x(k))+h 2 (x(k), x(k)) (1)

[0029] Known means of using FIR filters only consider h 1 (x(k)) this term. The polyphase term h 2 Basically the integration of the incoming signal, it requires additional DC compensation, which takes the factor h 0 substitute.

[0030] Figure 5 to Figure 8 Simulation results obtained according to the solution of the present invention are shown. exist Figure 5 In , the difference between the signal produced by the double equalizer and the Viterbi-decoded data is shown. Image 6 Compare the digital sum of ...

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Abstract

A method for bit recovery in an asymmetric data channel, the method comprising the steps of: providing a non-linear equalization filter with two coefficient sets; using the non-linear equalization filter with a first coefficient set for compensating defects of a first type of transition between different storage states; and using the non-linear equalization filter with a second coefficient set for compensating defects of a second type of transition between different storage states.

Description

technical field [0001] The present invention relates to a method and device for bit recovery in an asymmetric data channel, and also to a device for reading and / or writing from / to a recording medium using such a method or device. Background technique [0002] In current hard disk and optical disk applications, partial response maximum likelihood detectors (PRML, Viterbi) are used to recover data from channel data streams. figure 1 High frequency channel data representing a data stream from an exemplary optical channel signal is shown. Channel data is not distorted by asymmetry. In this case, the data clipping process can easily distinguish between two different signal states (high and low). However, the data pattern recorded on the recording medium may be distorted by the asymmetrical data writing process. For example, on optical recording media, one cause of asymmetry is image blooming, which is caused by non-linear effects during data recording. figure 2 An example of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/14G11B20/02G11B20/10H03H17/02H03M5/14H03M7/46
CPCH03M7/46G11B20/10212G11B20/1426G11B20/10009H03M5/145G11B20/02
Inventor 阿克塞尔·科克黑尔克劳斯·盖德克弗里德里克·蒂默曼奥利弗·泰斯
Owner THOMSON LICENSING SA
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