Binarization device
First Claim
1. A binarization device comprising:
- a binarization unit that binarizes a reproduction signal obtained by reproducing information recorded by mark length recording on a recording medium to obtain high-level signals and low-level signals based on a slice level;
a slice level setting unit that calculates the average value of the high-level signals output from the binarization unit, further calculates the slice level based on the average value, and sets the slice level to the binarization unit; and
a weight adding means of adding a predetermined weight to each signal having a short high-level time among the high-level signals.
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Abstract
The present invention provides a binarization device that realizes reproduction with a low error rate, even where optimum recording conditions such as recording power have not been set in the recording device, or where optimum recording has not been carried out for the reproducing device. The binarization device includes a binarization unit, a slice level setting unit, and a weight adding function. The binarization unit binarizes a reproduction signal obtained by reproducing information recorded by mark length recording on a recording medium to output high-level signals and low-level signals based on a slice level. The slice level setting unit calculates the average value of the high-level signals output from the binarization unit, and determines the slice level from the average value. The determined slice level is set to the binarization unit. Either the binarization unit or the slice level setting unit adds a predetermined weight to each signal having a short high-level time among the high-level signals.
29 Citations
9 Claims
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1. A binarization device comprising:
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a binarization unit that binarizes a reproduction signal obtained by reproducing information recorded by mark length recording on a recording medium to obtain high-level signals and low-level signals based on a slice level;
a slice level setting unit that calculates the average value of the high-level signals output from the binarization unit, further calculates the slice level based on the average value, and sets the slice level to the binarization unit; and
a weight adding means of adding a predetermined weight to each signal having a short high-level time among the high-level signals. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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2. A binarization device comprising:
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a binarization unit that binarizes a reproduction signal obtained by reproducing information recorded by mark length recording on a recording medium to output high-level signals that are above a slice level and low-level signals that are below the slice level, and further binarizes the reproduction signal to output low-level signals that are above the slice level and high-level signals that are below the slice level;
a slice level setting unit that calculates the average value of the former high-level signals and the average value of the latter high-level signals, further calculates the average value of the former high-level signal average value and the latter high-level signal average value, determines the slice level from the last average value, and sets the slice level to the binarization unit; and
a weight adding means of adding a predetermined weight to each signal having a short high-level time among all the high-level signals.
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3. A binarization device comprising:
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a binarization unit that binarizes a reproduction signal obtained by reproducing information recorded by mark length recording on a recording medium to output high-level signals that are above a slice level and low-level signals that are below the slice level, and further binarizes the reproduction signal to output low-level signals that are above the slice level and high-level signals that are below the slice level;
a slice level setting unit that calculates the average value of the former high-level signals and the average value of the latter high-level signals output from the binarization unit, selects one of the two average values based on the condition of the reproduction signal, calculates the slice level from the selected average value, and sets the slice level to the binarization unit; and
a weight adding means of adding a predetermined weight to each signal having a short high-level time among all the high-level signals.
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Specification