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    • 1. 发明授权
    • Method and apparatus for generating block-based low-density parity check matrix and recording medium having recorded thereon code for implementing the method
    • 用于生成基于块的低密度奇偶校验矩阵的方法和装置以及在其上记录了用于实现该方法的代码的记录介质
    • US07480845B2
    • 2009-01-20
    • US11298825
    • 2005-12-12
    • Hyun-jung KimJoo-ho KimKyung-geun Lee
    • Hyun-jung KimJoo-ho KimKyung-geun Lee
    • H03M13/00
    • H03M13/116H03M13/118H03M13/1185
    • A method of and an apparatus for generating a block-based low density parity check (LDPC) matrix, where calculation of an inverse matrix is not necessary and back-substitution is possible over the entire matrix area, and a recording medium having recorded thereon code for implementing the method. An area of the LDPC matrix is vertically divided based on respective lengths of first and second parity bit vectors and, a block-based matrix is generated such that a double diagonal matrix is arranged in an upper portion of an area corresponding to the second parity bit vector among areas into which the LDPC matrix is vertically divided., The area of the LDPC matrix is horizontally divided based on a position of the double diagonal matrix, and block-based matrices are generated in the divided areas of the LDPC matrix, to satisfy a condition that column weights (Wc) are uniform.
    • 一种用于生成基于块的低密度奇偶校验(LDPC)矩阵的方法和装置,其中不需要计算逆矩阵,并且在整个矩阵区域上可以进行背替换,并且其上记录有代码 用于实现该方法。 基于第一和第二奇偶校验位向量的相应长度,LDPC矩阵的区域被垂直分割,并且生成基于块的矩阵,使得双对角矩阵被布置在对应于第二奇偶校验位的区域的上部 LDPC矩阵垂直分割的区域之间的向量,基于双对角矩阵的位置水平划分LDPC矩阵的区域,并且在LDPC矩阵的划分区域中生成基于块的矩阵,以满足 列权重(Wc)均匀的条件。
    • 5. 发明申请
    • Method and apparatus for reproducing information recorded on a super resolution information storage medium
    • 用于再现记录在超分辨率信息存储介质上的信息的方法和装置
    • US20050190670A1
    • 2005-09-01
    • US11051515
    • 2005-02-07
    • Joo-ho KimIn-oh HwangHyun-ki KimDu-seop Yoon
    • Joo-ho KimIn-oh HwangHyun-ki KimDu-seop Yoon
    • G11B7/005G11B5/09G11B7/00G11B7/125
    • G11B7/1267
    • A method of and apparatus for reproducing information recorded in a super resolution information storage medium (SRISM) using an appropriate actual reproduction power, which is actually appropriate for reproduction, by actively detecting a threshold region that varies according to the reflectivity of the SRISM are provided. The method of reproducing information from an SRISM includes: radiating a light beam onto the SRISM, while varying a reproduction power of the laser beam, receiving the light beam reflected by the SRISM, and detecting a change in the level of a reproduction signal from the received light beam; calculating, based the change in the level of the reproduction signal, a reference reproduction power at which the gradient of a graph of the levels of the reproduction signal with respect to the reproduction power changes; and setting the actual reproduction power based on the reference reproduction power. The apparatus for reproducing information from an SRISM includes: an optical pickup unit including a light source which radiates a light beam having a range of power onto the SRISM, and a photodetector which receives the light beam reflected from the SRISM and detects a reproduction signal from the received light beam; and a signal processing unit which detects a change in the level of the reproduction signal according to a change in the reproduction power of the light beam radiated onto the SRISM by the light source and sets the actual reproduction power of the light beam emitted from the light source based on a reference reproduction power at which the gradient of a graph of the levels of the reproduction signal with respect to the reproduction power changes.
    • 提供一种用于通过主动地检测根据SRISM的反射率而变化的阈值区域,使用实际适合于再现的适当实际再现功率再现记录在超分辨率信息存储介质(SRISM)中的信息的方法和装置 。 从SRISM再现信息的方法包括:在SRISM上照射光束,同时改变激光束的再现功率,接收由SRISM反射的光束,以及检测来自该信号的再现信号的电平变化 接收光束; 基于再现信号的电平的变化来计算再现信号的电平相对于再现功率的电平的曲线变化的参考再现功率; 以及基于所述参考再现功率设置所述实际再现功率。 用于从SRISM再现信息的设备包括:光学拾取单元,包括将具有功率范围的光束辐射到SRISM上的光源;以及光电检测器,其接收从SRISM反射的光束并检测来自 接收光束; 以及信号处理单元,其根据由光源辐射到SRISM上的光束的再现功率的变化来检测再现信号的电平的变化,并设置从光发射的光束的实际再现功率 基于再现功率的电平的曲线的梯度相对于再现功率的参考再现功率发生变化。