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    • 52. 发明专利
    • Noise shaping circuit and method with feedback steering overload compensation and system using the same
    • 噪声形成电路及其反馈转向过载补偿方法及其使用方法
    • JP2007267434A
    • 2007-10-11
    • JP2007192464
    • 2007-07-24
    • Cirrus Logic Incシーラス ロジック,インコーポレイテッドCirrus Logic,Inc.
    • MELANSON JOHN LAURENCE
    • H03M7/32H03M3/04H03M7/36
    • H03M7/3011H03M7/3026H03M7/3033
    • PROBLEM TO BE SOLVED: To provide a method and a circuit whereby a noise shaper is immune to an input overload.
      SOLUTION: The noise shaper includes a first feedback loop for noise shaping a first feedback signal under normal operating conditions and having a first filter (201) with a first signal transfer function and a second feedback loop that is stable under overload conditions and has a second filter (202) having a second signal transfer function differing from the first signal transfer function. The noise shaper also includes an output circuit block including a quantizer (203) and steering circuitry (204). The quantizer (203) includes an input simultaneously responsive to outputs of the first (201) and second filters (202). The steering circuitry (204) steers a feedback signal from an output of the quantizer (203) to input of the first and second feedback loops.
      COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:提供一种噪声整形器免于输入过载的方法和电路。 解决方案:噪声整形器包括用于在正常操作条件下对第一反馈信号进行噪声整形并具有第一信号传递函数的第一滤波器(201)和在过载条件下稳定的第二反馈环路的第一反馈环路,以及 具有不同于第一信号传递函数的第二信号传递函数的第二滤波器(202)。 噪声整形器还包括包括量化器(203)和转向电路(204)的输出电路块。 量化器(203)包括同时响应于第一(201)和第二滤波器(202)的输出的输入。 转向电路(204)将来自量化器(203)的输出的反馈信号转向第一和第二反馈回路的输入。 版权所有(C)2008,JPO&INPIT
    • 54. 发明专利
    • Sliding mode control of magneto-resistive read head for magnetic recording
    • 用于磁记录的磁阻读取头的滑动模式控制
    • JP2007220301A
    • 2007-08-30
    • JP2007142615
    • 2007-05-29
    • Cirrus Logic Incシーラス ロジック, インコーポレイテッド
    • ROMANO PAUL MSUPINO LOUIS
    • G11B21/08G11B21/10G11B5/00G11B5/55G11B5/596
    • G11B5/59683G11B5/5547G11B2005/0016
    • PROBLEM TO BE SOLVED: To provide a sliding mode controller for controlling the motion of a magneto-resistive (MR) read head.
      SOLUTION: A magnetic disk comprises a plurality of concentric data tracks recorded thereon wherein each data track comprises user data and servo data. The sliding mode controller operates by multiplying a head position error phase state and a head position error velocity phase state by respective switching gains to force the phase states to follow a predetermined phase state trajectory. The phase state trajectory can be defined by a single linear segment, a variable linear segment, multiple linear segments over the entire region of excursion, or optimum parabolic acceleration and deceleration segments. Switching logic, responsive to the phase states and a trajectory segment value σ, switches between positive and negative feedback gains to drive the phase states toward a current trajectory segment.
      COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:提供一种用于控制磁阻(MR)读取头的运动的滑动模式控制器。 解决方案:磁盘包括记录在其上的多个同心数据轨道,其中每个数据轨道包括用户数据和伺服数据。 滑动模式控制器通过将头部位置误差相位状态和头部位置误差速度相位状态乘以相应的切换增益来操作,以迫使相位状态遵循预定的相位状态轨迹。 相位状态轨迹可以由单个线性段,可变线性段,整个移动区域上的多个线性段或最佳抛物线加速和减速段来定义。 响应于相位状态和轨迹段值σ的开关逻辑在正和负反馈增益之间切换以将相位状态驱动到当前轨迹段。 版权所有(C)2007,JPO&INPIT