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Information reproducing apparatus and information reproducing method

A technology for information reproduction and equipment, applied in information storage, recorded information storage, digital recording/reproduction, etc., and can solve problems such as increasing bit errors

Inactive Publication Date: 2005-01-26
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This increases the possibility of bit errors in the subsequent decoding process through the maximum likelihood decoder

Method used

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  • Information reproducing apparatus and information reproducing method
  • Information reproducing apparatus and information reproducing method
  • Information reproducing apparatus and information reproducing method

Examples

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no. 1 example

[0026] A first embodiment of the present invention provides an information reproducing apparatus and an information reproducing method that reduce decoding errors thereby correcting an equalized signal generated from an equalizer so as to correspond to a reference level of Viterbi decoding. For example, to achieve this, correction processing is performed so that the value of each equalized signal waveform at the reference levels LV0 and LV6 reaches the difference value LVd between the respective reference levels of the Viterbi decoder.

[0027] (Configuration of Optical Disc Apparatus of the Invention (First Embodiment))

[0028] FIG. 1 is a block diagram showing an example of main components of an optical disc device according to the present invention (first embodiment).

[0029] Referring to FIG. 2, an optical disc apparatus A of the present invention (first embodiment) records data on an optical disc D and reproduces data from the optical disc D. Referring to FIG. The stru...

no. 2 example

[0091] The second embodiment of the present invention is to provide an information reproducing apparatus and an information reproducing method in which bit errors are reduced by applying correction processing so that the peak levels (LP2 and LP4) of the equalized signal sent from the equalizer within the shortest pulse interval correspond to The potential of the Viterbi decoding reference levels (LV2 and LV4) within the shortest pulse interval. Fig. 10 is a block diagram showing an example of the parameter control section 15 of the optical disc device according to the second embodiment of the present invention. Figure 11 is a histogram of an example of the equalized signal which has been corrected by the variable gain amplifier and the reference level of the Viterbi decoder of the optical disc apparatus.

[0092] As shown in FIG. 10, by using the corrected equalization signal Eqg(T), the decoded signal D(T), and the reproduced signal Rf(T) output from the preamplifier 12, the...

no. 3 example

[0102] A third embodiment of the present invention provides an information reproducing apparatus and an information reproducing method in which bit errors are reduced by applying correction processing so that a one-further-outside equalized signal from an equalizer within the shortest pulse interval The peak levels (LP2 and LP4) correspond to the potentials of the Viterbi decoding reference levels (LV1 and LV5) within the shortest pulse interval. Fig. 12 is a block diagram showing an example of the parameter control section 15 of the optical disc apparatus according to the third embodiment of the present invention. Figure 13 is a histogram of an example of the equalized signal which has been corrected by the variable gain amplifier and the reference level of the Viterbi decoder of the optical disc apparatus.

[0103] Unlike the case of the second embodiment, in the third embodiment, correction processing is applied so that the peak levels (LP1 and LP5) of the equalized signal...

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Abstract

An information reproducing apparatus has an equalizing filter which performs partial response equalization of a detection signal detected by a detecting section and which outputs an equalized signal, a variable gain amplifier which corrects the potential of the equalized signal in accordance with a correction amount determined in accordance with a plurality of reference levels that are used for maximum-likelihood decoding and a plurality of peak levels in a histogram of equalized signals corresponding to the plurality of reference levels, and a maximum-likelihood decoder which performs the maximum-likelihood decoding by referencing the reference levels, in accordance with the equalized signal that has been corrected. The apparatus controls the signal amplitude of the equalized signal to an appropriate value, thereby implementing high-reliable decoding processing.

Description

technical field [0001] The present invention relates generally to an information reproducing apparatus, and more particularly, to an information reproducing apparatus and an information reproducing method that perform decoding using a PRML (Partial Response and Maximum Likelihood) technique. Background technique [0002] In recent years, an information recording / reproducing apparatus that performs recording / reproduction using a recording medium such as an optical disc such as a DVD (Digital Versatile Disc) has very wide public use. This involves a growing demand for higher recording densities achieved by using different technologies. In response to these demands, for example, PRML technology is applied as an information recording / reproducing technology of a recording medium such as an optical disk. [0003] In PRML signal communication technology, corresponding to the optical disc containing information, the reproduced information detected by the read / write head is equalize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/10G11B20/18
CPCG11B20/10055G11B20/10009G11B20/10296
Inventor 竹原慎太郎
Owner KK TOSHIBA