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    • 6. 发明申请
    • Scrambler and storage device using the same
    • 扰码器和使用相同的存储设备
    • US20080130868A1
    • 2008-06-05
    • US11897476
    • 2007-08-30
    • Hiroaki Ueno
    • Hiroaki Ueno
    • H04K1/00
    • H04L1/00H04L25/4906
    • A scrambler that facilitates encryption of data to be recorded and a magnetic storage device using this are provided. The scrambler has a shift register of a plurality of stages and an exclusive OR circuit that finds the exclusive OR of the logic of the stages of the shift register that correspond to a single generating polynomial. The output of the exclusive OR circuit is arranged to be fed back to the initial stage of the shift register. At least this single generating polynomial is an arbitrary generating polynomial. The drive number, in binary form, that identifies the storage device, is set as the initial value of the shift register of a plurality of stages.
    • 提供了促进要记录的数据的加密的扰码器和使用该数据的磁存储装置。 加扰器具有多级的移位寄存器和异或电路,该异或电路找到与单个生成多项式相对应的移位寄存器的级的逻辑的异或。 异或电路的输出被布置为反馈到移位寄存器的初始阶段。 至少该单个生成多项式是任意生成多项式。 以二进制形式识别存储设备的驱动器号被设置为多级的移位寄存器的初始值。
    • 9. 发明授权
    • Error propagation detection and control method, and memory device using the same
    • 误差传播检测和控制方法,以及使用其的存储器件
    • US06717986B1
    • 2004-04-06
    • US09442555
    • 1999-11-18
    • Hiroaki Ueno
    • Hiroaki Ueno
    • H03H730
    • H04L25/03057H04L2025/0349
    • An error propagation detection method and apparatus for use in decision feedback equalization type detection is disclosed, with which it is possible to detect error propagation even when a specific code conversion rule is satisfied in an MDFE system. If the input signal of a comparative decider be a binary signal a(k) expressed as ±1, an error signal ev(k) expressed by ev(k)=[y(k)−Ideal y(k)] sign[a(k)] is determined using a(k−1)≠a(k+1) as an error computation condition. The error signal ev(k) thus determined is checked to see whether it exceeds a specific value. If so, the slice level of the comparative decider is controlled to a corresponding offset value.
    • 公开了一种在判决反馈均衡型检测中使​​用的误差传播检测方法和装置,即使在MDFE系统中满足特定代码转换规则的情况下也可以检测误差传播。 如果比较判别器的输入信号为表示为±1的二进制信号a(k),则由ev(k)= [y(k)-Ideal y(k)]表示的误差信号ev(k) (k)]使用(k-1)<> a(k + 1)作为误差计算条件来确定。 检查如此确定的误差信号ev(k)以查看其是否超过特定值。 如果是这样,则比较判定器的限幅电平被控制到相应的偏移值。
    • 10. 发明授权
    • Signal reproducing circuit adapted to head utilizing magneto-resistive
effect
    • 信号再现电路适用于磁头利用磁阻效应
    • US6118611A
    • 2000-09-12
    • US948209
    • 1997-10-09
    • Hidekazu ShibasakiHiroaki UenoKen Yakuwa
    • Hidekazu ShibasakiHiroaki UenoKen Yakuwa
    • G11B5/00G11B5/02G11B19/02G11B5/09
    • G11B5/02G11B19/02G11B2005/0016G11B2005/0018
    • A signal reproducing circuit for a magneto-resistive effect head includes a constant current source for supplying a sense current to an MR head in a read state, first constant current sources for supplying first constant currents to a pair of reproduction transistors in the read state, and a capacitor connected between the emitters of the transistors. Furthermore, second constant current sources for supplying second constant currents are connected in parallel with the first constant current sources. Control is given so that when switching an idle state to the read state is commanded, the second constant current sources remain on for a given period of time. Owing to this circuitry, a transient period during which the idle state is switched to the read state or a transient period during which heads are switched in the read state can be shortened to a great extent. Consequently, superposition of an unwanted offset component on a reproduced signal can be suppressed, and a loss in data-handling capacity can be minimized.
    • 用于磁阻效应头的信号再现电路包括用于在读取状态下向MR磁头提供感测电流的恒流源,用于在读取状态下向一对再现晶体管提供第一恒定电流的第一恒定电流源, 以及连接在晶体管的发射极之间的电容器。 此外,用于提供第二恒定电流的第二恒流源与第一恒定电流源并联连接。 给出控制,使得当将空闲状态切换到读取状态时,第二恒定电流源保持打开一段给定的时间。 由于该电路,可以在很大程度上缩短空闲状态切换到读取状态的过渡时段或读取状态期间磁头切换的过渡时段。 因此,可以抑制再现信号上的不需要的偏移分量的叠加,并且可以最小化数据处理能力的损失。