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Optical information reproducing method and device

A technology of optical information and decoding method, which is applied in the direction of optical recording/reproduction, information storage, recording information storage, etc., which can solve problems such as errors and reduce decoding capabilities, and achieve the effect of accurately demodulating data

Inactive Publication Date: 2003-04-30
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, if the combination of 0.00 / 0.25 / 0.75 / 1.0 is used as the reference value of Viterbi decoding, errors will occur even though Viterbi decoding is used, which will significantly reduce the decoding ability

Method used

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  • Optical information reproducing method and device
  • Optical information reproducing method and device
  • Optical information reproducing method and device

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Embodiment Construction

[0042] Referring to the accompanying drawings, preferred embodiments of the digital signal transmission apparatus of the present invention will be described in detail.

[0043] First, a 4-value 4-state Viterbi decoding method embodying the present invention will be described.

[0044] In Viterbi decoding, in order to decode, the probability of transitioning from a given state to the next state is calculated and the route with the greatest probability of state transition is found. In Viterbi decoding, the routing of state transitions is usually called a path, and the probability of passing through a given state is called a metric.

[0045] In the following calculations, the metric representing the probability at state Sx at time point k is denoted L(Sx,k) as a path metric and the sum of the squared differences between the measured value z(k) and the reference value. The path with the smallest path metric is the most likely correct data. In addition, there are computational me...

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Abstract

An optical information reproducing method for demodulating the information recorded on a recording medium by a viterbi decoding method, in which data can be demodulated with high accuracy even if the recording power has undergone variations at the time of recording the information. Data recorded on the recording medium after modulation in which the minimum length between transitions is limited to not less than 2 is decoded using the viterbi decoding method. A specified signal recorded on the recording medium is used for setting the reference value used for viterbi decoding.

Description

technical field [0001] The present invention relates to an optical information playback method and apparatus for demodulating information recorded on a recording medium using a Viterbi decoding method. Background technique [0002] US Patent No. 5,581,581 discloses an "equalizer" of a commonly used Viterbi decoding method, wherein a synchronization signal data detection circuit is used to detect the synchronization signal data portion from the received signal data string, and a transmission line characteristic estimation circuit is used to simulate The impulse response between the transmitter and the receiver, and the transmitted data is decoded using the Viterbi algorithm according to the transmission model obtained from the transmission line characteristic estimation circuit. [0003] In the field of information recording, research on optical recording / reproducing information signal systems has progressed in recent years. Optical recording / reprod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/12G11B7/005G11B20/10G11B20/14G11B20/18G11B27/30H03M13/41
CPCG11B7/005G11B20/10009G11B27/3027H03M13/4107G11B20/10101G11B20/10296G11B20/10046G11B20/10222G11B2220/2537
Inventor 香川正毅
Owner SONY CORP