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US 9,070,376 B2Granted
Method for evaluating information reproduction performance, information reproduction device, and information recording medium
AssigneeHitachi-LG Data Storage, Inc.
InventorsSoichiro Eto, Yoshitaka Morimoto
Life of this patent
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Abstract
A method for evaluating a reproduction performance which reproduces a specific pattern recording signal to measure a reproduced signal noise, and calculates an evaluated value of a reproduction performance on the basis of a frequency characteristic of the measured reproduced signal noise.
Claims12
A method for evaluating an information reproduction performance, comprising:
- reproducing a recording signal of a given pattern by irradiating a recording medium with a light, and measuring a reproduced signal noise;
- calculating a frequency characteristic related to the reproduced signal noise using a value obtained by standardizing the reproduced signal noise by a signal intensity;
- calculating an evaluated value on the basis of the frequency characteristic;
- and
- evaluating reproduction performance using the evaluated value.
2 more elements
A method for evaluating an information reproduction performance, comprising:
- reproducing a recording signal of a given pattern by irradiating a recording medium with a light, and measuring a reproduced signal noise;
- calculating a frequency characteristic related to the reproduced signal noise;
- calculating an evaluated value on the basis of the frequency characteristic, including:
- calculating an amount of i-MLSE generated in respective frequencies by allowing a given filter to act on the frequency characteristic, and
- calculating a square root of a sum of square values of the i-MLSE amount of the respective frequencies;
- and
- evaluating reproduction performance using the evaluated value.
4 more elements
A method for evaluating an information reproduction performance, comprising:
- reproducing a recording signal of a given pattern by irradiating a recording medium with a light, and measuring a reproduced signal noise;
- calculating a frequency characteristic related to the reproduced signal noise;
- calculating an evaluated value on the basis of the frequency characteristic, including:
- calculating the noise of the respective frequencies by allowing a given filter to act on the frequency characteristic, and
- calculating a sum of the intensities of the noise of the respective frequencies;
- and
- evaluating reproduction performance using the evaluated value.
4 more elements
An information reproduction device, comprising:
- an optical pickup unit having an optical system for irradiating a recording medium with a light;
- a signal processing unit that processes a reproduced signal output from the optical pickup unit;
- and
- a control unit including a noise calculation unit that calculates a frequency characteristic related to a reproduced signal noise on the basis of a signal from the signal processing unit, a reproduction performance evaluation unit that calculates an evaluation index on the basis of the frequency characteristic, and a noise filter calculation unit that adds noise of respective frequencies and intensities to the reproduced signal to generate an evaluation signal and calculate a variation of the reproduced signal and the evaluation signal.
1 more element
Dependencies are inferred from the claim text.