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Data restoring method and device

A data and numerical technology, applied in the field of data reduction and device, can solve the problem of affecting the long T component, and achieve the effect of improving the accuracy

Inactive Publication Date: 2012-06-06
SUNPLUS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In other words, the asymmetric compensator is used to compensate the offset of the short T, but such a design will still affect the long T component, and the subsequent digital circuit design will also be affected and must be redesigned

Method used

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  • Data restoring method and device
  • Data restoring method and device

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Embodiment Construction

[0046] Please refer to Figure 5 , which is a schematic view of the reading channel in the optical storage system of the present invention. The reading channel includes: an analog-to-digital converter 502 , a time recovery unit 510 , an adaptive re-timing unit 520 and a signal cutting unit 530 . Wherein, the time recovery unit 510 includes: a high-pass filter 504 , a digital equalizer 506 , a zero-crossing reference level generation unit 508 , and a digital phase-locked loop circuit 509 . Wherein, the time recovery signal adjustment unit 520 receives the time recovery output signal ( RTO1 ) output by the time recovery unit 510 , and generates an adjusted time recovery output signal ( RTO2 ) to the subsequent signal cutting unit 530 . The time reply signal adjusting unit 520 can properly adjust the short T component in the radio frequency signal (RF) to have better symmetry.

[0047] Such as Image 6 As shown, the timing recovery signal adjustment unit 520 includes a timing ...

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Abstract

The invention discloses a data restoring method and device. The data restoring method comprises the following steps of: receiving multiple sampling values, and classifying the sampling values into a first group, a second group, a third group and a fourth group; generating a first channel estimated value by utilizing the sampling values in the second group and generating a second channel estimatedvalue by utilizing the sampling values in the third group; judging whether a first sampling value less than the first channel estimated value exists in the first group or judging whether a second sampling value more than the second channel estimated value exists in the fourth group; changing the first sampling value or changing the polarity of the second sampling value when the judging result is yes, and outputting the sampling values; and outputting the sampling values when the judging result is not. By applying the method and device disclosed by the invention, asymmetric short-T components can be adjusted to be symmetric without influencing long-T components in a radio signal, and the correctness of a radio frequency cut signal can be improved.

Description

technical field [0001] The present invention relates to a method and device for restoring data, and in particular to a method and device for restoring radio frequency (RF) data in an optical disc drive. Background technique [0002] In the optical storage system (optical storage system), the light spot (light spot) emitted by the optical pickup head irradiates the light spot (land) and dark spot (pit) on the track of the optical disc, and the light detection The photo detector chip (Photo Detector IC, PDIC) receives the reflected light and generates a radio frequency signal (radio frequency signal, RF). The radio frequency signal (RF) must be processed by the read channel (read channel) in the optical storage system before the sliced ​​RF signal (SLRF) and the channel clock signal (channel clock, PLCK) representing the data on the optical disc can be obtained. ). [0003] Please refer to FIG. 1( a ), which is a schematic diagram of a reading channel in an optical storage s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/09
Inventor 郑晏阡杨永吉陈政雄
Owner SUNPLUS TECH CO LTD
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