Data detection device, reproduction device, and data detection method
A data detection device and data detection technology, applied in digital recording/reproduction, digital signal error detection/correction, data recording, etc., can solve problems such as increased crosstalk between adjacent tracks
Active Publication Date: 2017-10-13
SONY CORP
View PDF6 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The purpose of the present invention is to improve data detection capabilities by whitening cross-talk noise from an equalized signal and carrying out binary data detection. In the present invention, multi-input adaptive equalization processing is carried out on the optical feedback generated when light is projected, to an optical recording medium on which a plurality of tracks are formed, in a range that includes a data-detection-object track and tracks adjacent thereto, to obtain an equalized signal by inputting each of a plurality of detection signals generated by using the light reception signals of a plurality of divided regions of an optical detection unit to a plurality of adaptive equalizers respectively, and calculating the output of the plurality of adaptive equalizers. The cross-talk noise, from the adjacent tracks, contained in the equalized signal obtained by the multi-input adaptive equalization processing is whitened, and further, binarization is carried out. An equalization error is found from an equalization target obtained on the basis of binary detection results, and the equalized signal obtained by the multi-input adaptive equalization processing. Such equalization error is supplied to the plurality of adaptive equalizers as a control signal for adaptive equalization. In addition, carried out is whitening coefficient update processing in which the filter coefficient of a whitening filter is 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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G11B20/10G11B20/18
CPCG11B20/10009G11B20/10046G11B20/10055G11B20/10277G11B20/10287
Inventor 东野哲
Owner SONY CORP