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Digital signal decoding device and digital signal decoding method

A technology of digital signal and input signal, which is applied in the field of digital signal decoding equipment and digital signal decoding, and can solve problems such as increased power consumption and increased circuit complexity

Inactive Publication Date: 2007-03-21
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to parallel processes, the circuit complexity is greatly increased, resulting in increased power consumption

Method used

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  • Digital signal decoding device and digital signal decoding method
  • Digital signal decoding device and digital signal decoding method
  • Digital signal decoding device and digital signal decoding method

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Embodiment Construction

[0029] An embodiment of the present invention will be described below with reference to the accompanying drawings.

[0030] First, the Viterbi algorithm for conversion is described. This algorithm converts a trellis graph into a trellis graph modified by moving metric operations associated with sample data at corresponding times outside the metric comparison and routing operations on the trellis graph, and includes (a) by comparing The difference between the metric and the given value regardless of the recursive step to select the next surviving path to reach the corresponding state, and (b) the step of adding a moved branch metric at each node.

[0031]For example, a general Viterbi decoder having an impulse response of channel=(1221) and using a (1,7) RLL code will be described below using FIGS. 5 and 6 . Figure 5 shows a general trellis diagram corresponding to PR(1221). When using (1,7) RLL code in PR(1221), the number of internal states is 6. Let S0, S1, S3, S4, S6, an...

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Abstract

Digital signal decoding device and digital signal decoding method. A digital signal decoding device according to an aspect of the present invention is a digital signal decoding device for generating a binary code sequence by maximum likelihood estimation from a convolutionally encoded input signal sequence, includes an add-compare-select unit configured to compare only two metric values one unit time before the calculation time of a predetermined branch metric value calculated from the input signal sequence at two successive times at each time, to add the predetermined branch metric value to the two metric values independently of the compare process, to select one of the two sums in accordance with the comparison result of the two metric values, and to output the selected value as a metric value to be used at the next time.

Description

technical field [0001] The present invention relates to a digital signal decoding device and a digital signal decoding method applied to a digital signal reproduction device such as an optical disc device, in particular, to a digital signal decoding device and a digital signal decoding device applied to a signal reproduction circuit using PRML technology decoding method. Background technique [0002] As a recording medium that can record and reproduce digital data, an optical disc represented by DVD (Digital Versatile Disc) is well known. As a type of DVD, DVD-RAM includes a signal recording layer. When this recording layer is irradiated with a laser beam having a corresponding energy, its crystal state changes. When the recording layer is again irradiated with a laser beam of corresponding energy, reflected light is obtained in an amount corresponding to the crystal state of the recording layer. By detecting this reflected light, digital data recorded on the recording la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/10H03M13/23H04L25/497G06F11/10G11B20/18H03M13/41
CPCG11B20/18H03M13/6502H03M13/3961H03M13/6343G11B20/10046G11B20/10009H03M13/4107G11B2020/1863
Inventor 山川秀之
Owner KK TOSHIBA