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Maximum likelihood decoding device, signal estimating method and reproduction device

一种最大似然解码、最大似然路径的技术，应用在记录信号处理、其他解码技术、数字记录/再现等方向，能够解决错误等问题

Inactive Publication Date: 2006-10-04
SONY CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, an error occurs when the path metric of the maximum likelihood path is greater than the path metric of the second path

Method used

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  • Maximum likelihood decoding device, signal estimating method and reproduction device
  • Maximum likelihood decoding device, signal estimating method and reproduction device
  • Maximum likelihood decoding device, signal estimating method and reproduction device

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Embodiment Construction

[0057] The best mode (hereinafter referred to as embodiment) for carrying out the present invention will be described below.

[0058] figure 1 is a schematic block diagram showing the reproduction apparatus according to the first embodiment of the present invention.

[0059] Such as figure 1 As shown, the reproducing apparatus according to the present embodiment includes: a recording medium 90 in the form of a magnetic disk such as an optical disc; an optical pickup 1 for reproducing bit information from the recording medium 90; The read signal is converted into a reproduced signal (RF signal).

[0060] The reproducing device also includes: an A / D converter 3, which is used to make the reproduced signal RF undergo A / D conversion; an equalizer 4, which is used to adjust the waveform of the reproduced signal RF for PLL (Phase Locked Loop, phase locked loop) processing; And a PLL circuit 5 for reproducing a clock from the reproduction signal RF.

[0061] This reproducing ap...

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PUM

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Abstract

The invention relates to a maximum likelihood decoder, a signal evaluation method and represent device, wherein said device decoder comprises: a Viterbi detector for detecting the bit of represent signal that representing the bit information, to set the reference level used to calculate branch metric; a Oldham's distance calculator for calculating the maximum likelihood path as the result of path selector and the Oldham's distance between it and the second path compared with the maximum likelihood path; a metric difference calculator for based on the represent signal, the maximum likelihood path and the second path, calculating the path metric value of second path and the metric difference between said path metric values; a sample average calculator for sampling said Oldham's distance between the maximum likelihood path and the second path, to calculate the average of Oldham's distance; and a variance calculator for calculating the variance of metric difference.

Description

technical field [0001] The present invention relates to, for example, a maximum likelihood decoding device for performing PRML (Partial Response Maximum Likelihood) decoding processing on a reproduced signal from a recording medium, and a maximum likelihood decoding device having such a maximum likelihood decoding device and reproducing and recording A device for reproducing information on a recording medium. The present invention also relates to a signal estimation method in a maximum likelihood decoding device. Background technique [0002] [Patent Document 1]: Japanese Patent Application Laid-Open No. 10-21651 [0003] [Patent Document 2]: Japanese Unexamined Patent Publication No. 2003-141823 [0004] [Patent Document 3]: Japanese Unexamined Patent Publication No. 2003-151220 [0005] [Patent Document 4]: Japanese Unexamined Patent Publication No. 2003-178537 [0006] For example, as a method for estimating the signal quality of a reproduced signal from an optical di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/00
CPCH03M13/41G11B20/10009G11B20/10296G11B20/10111H03M13/6343G11B2220/2541G11B20/1012
Inventor 白石淳也
Owner SONY CORP
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