US 8,462,602 B2Granted

Data recovery device and method

AssigneeSunplus Technology Co., Ltd.

InventorsShih-Hsien Liu, Zhieng-Chung Chen

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Abstract

A data recovery device including an analog to digital converter (ADC), a filtering-equalizing unit, a zero crossing detector, a data phase locked loop, a data mapping unit and an estimation unit is provided. The ADC converts a radio frequency signal to a plurality of sampling data points. The sampling data points are converted to a plurality of retiming data points and a clock signal by the filtering-equalizing unit, the zero crossing detector and the data phase locked loop. The data mapping unit selects a plurality of maximum data points and minimum data points from the returning data points, and determines whether to map the maximum data points and the minimum data points to other levels for partially reconstructing the retiming data points. The estimation unit recovers the reconstructed retiming data points to a modulation signal.

Claims15

Dependent claims

A data recovery device, used for recovering a radio frequency signal in an optical storage system to a clock signal and a modulation signal, the data recovery device comprising:

an analog to digital converter, for converting the radio frequency signal into a plurality of sampling data points;
a filtering-equalizing unit, for compensating gain values of the sampling data points, and filtering noises of the sampling data points;
a zero crossing detector, separating numbers of the sampling data points above and below a comparison level;
a data phase locked loop, for obtaining a plurality of retiming data points among the sampling data points and the clock signal;
a data mapping unit, for selecting a plurality of regional maximum data points and minimum data points from the retiming data points, and determining whether or not to respectively map the maximum data points and the minimum data points to a first level and a second level for partially reconstructing the retiming data points, wherein the first level and the second level are respectively greater than and less than a reference level;
and
an estimation unit, for recovering the reconstructed retiming data points to the modulation signal according to a partial response maximum likelihood method.

4 more elements

A data recovery method, for recovering a radio frequency signal in an optical storage system to a clock signal and a modulation signal, the data recovery method comprising:

converting the radio frequency signal into a plurality of sampling data points;
compensating gain values of the sampling data points, and filtering noises of the sampling data points;
separating numbers of the sampling data points above and below a comparison level;
obtaining a plurality of retiming data points among the sampling data points and the clock signal;
selecting a plurality of regional maximum data points and minimum data points from the retiming data points, and determining whether or not to respectively map the maximum data points and the minimum data points to a first level and a second level for partially reconstructing the retiming data points, wherein the first level and the second level are respectively greater than and less than a reference level;
and
recovering the reconstructed retiming data points to the modulation signal according to a partial response maximum likelihood method.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/040,272Filed 4 Mar 2011
Priority: TW 99132633 A27 Sep 2010
Published: US 2012/0075976 A129 Mar 2012
Granted: 11 Jun 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G11B 20/10055
Filtering or equalising, e.g. setting the tap weights of an FIR filter: using partial response filtering when writing the signal to the medium or…
G11B 20/1025
Wherein a phase-locked loop [PLL] is used: the PLL being discrete time or digital PLL
G11B 20/10277
Bit detection or demodulation methods: the demodulation process being specifically adapted to partial response channels, e.g. PRML decoding
G11B 20/10314
Signal quality assessment: amplitude of the recorded or reproduced signal