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Data detection device, reproduction device, and data detection method

A data detection device and data detection technology are applied in the directions of digital recording/reproduction, digital signal error detection/correction, data recording, etc., and can solve problems such as increased crosstalk between adjacent tracks

Active Publication Date: 2020-04-14
SONY CORP
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  • Abstract
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Problems solved by technology

[0009] Also, if the track pitch is narrowed to increase disc density, the crosstalk from adjacent tracks will increase

Method used

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  • Data detection device, reproduction device, and data detection method
  • Data detection device, reproduction device, and data detection method
  • Data detection device, reproduction device, and data detection method

Examples

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Embodiment Construction

[0041] Embodiments will be described below in the following order.

[0042]

[0043]

[0044]

[0045]

[0046] figure 1 A configuration example of an optical disc playback device (hereinafter referred to as a playback device) of the present embodiment is shown.

[0047] Such as figure 1 As shown, the playback device includes an optical pickup 101 and a spindle motor 102 . The optical pickup 101 records information onto or plays back information from the optical disc 100 serving as an optical recording medium. The spindle motor 102 rotates the optical disc 100 . A screw mechanism (feed motor) 103 is provided to move the optical pickup 101 in the radial direction of the optical disc 100 .

[0048]A high-density optical disc such as BD (Blu-ray Disc (registered trademark)) can be used as the optical disc 100 . The BD is a high-density optical disc having a recording capacity of about 25 GB (gigabytes) on one layer on one side and about 50 GB on two layers on one sid...

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PUM

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Abstract

The object of the present invention is to improve the data detection capability by whitening the crosstalk noise from the equalized signal and performing binary data detection. In the present invention, within the scope of the track including the data detection object track and its adjacent track, the multi-input adaptive equalization process is performed on the optical feedback generated when projecting light on the optical recording medium formed with multiple tracks, by inputting each of a plurality of detection signals generated by using light-receiving signals of a plurality of divided regions of the optical detection unit to a plurality of adaptive equalizers, respectively, and calculating outputs of the plurality of adaptive equalizers, to obtain a balanced signal. Crosstalk noise from adjacent tracks contained in the equalized signal obtained by the multi-input adaptive equalization process is whitened, and further binarized. An equalization error is found from an equalization target obtained based on binary detection results and an equalized signal obtained through a multi-input adaptive equalization process. This equalization error is provided to a plurality of adaptive equalizers as a control signal for adaptive equalization. In addition, whitening coefficient update processing is performed in which the filter coefficients of the whitening filter are adaptively updated.

Description

technical field [0001] The technology relates to a data detection device, a playback device and a data detection method, and in particular to a decoding technology of an equalized signal subjected to crosstalk cancellation and partial response equalization. [0002] [citation list] [0003] patent documents [0004] 【PTL 1】 [0005] JP 2005-302130A [0006] 【PTL 2】 [0007] JP 2012-79385A Background technique [0008] In the case of partial response (PR) equalization on a playback signal from an optical disc or the like as described in PTL 1, attention is also paid to noise. NPML (Noise Prediction Maximum Likelihood) is known to improve detection capability by whitening the noise of interest. [0009] Furthermore, if the track pitch is narrowed to increase disc density, crosstalk from adjacent tracks will increase. For example, PTL 2 describes a crosstalk canceller that supplies respective playback signals of a target track to be played back and tracks on both sides t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/10G11B20/18
CPCG11B20/10009G11B20/10046G11B20/10055G11B20/10277G11B20/10287
Inventor 东野哲
Owner SONY CORP
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