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    • 82. 发明授权
    • Data coding for enforcing constraints on ones and zeros in a communications channel
    • 数据编码,用于在通信信道中对1和0执行约束
    • US07269778B1
    • 2007-09-11
    • US10423552
    • 2003-04-25
    • Weishi FengPantas Sutardja
    • Weishi FengPantas Sutardja
    • H03M13/00
    • H03M5/145
    • A communications channel such as a data storage system removes unwanted bit patterns from user data without using run length limited coding on the user data. A buffer receives the user data. A data dependent scrambler communicates with the buffer and selects one of a plurality of scrambling sequences based the user data stored in the buffer or generates a scrambling sequence based on the user data stored in the buffer. A scrambling device communicates with the data dependent scrambler and scrambles the user data stored in the buffer with the selected scrambling sequence from the data dependent scrambler.
    • 诸如数据存储系统的通信信道从用户数据中去除不想要的比特模式,而不对用户数据使用游程长度限制编码。 缓冲区接收用户数据。 数据相关扰频器与缓冲器通信,并且基于存储在缓冲器中的用户数据选择多个加扰序列中的一个,或者基于存储在缓冲器中的用户数据产生加扰序列。 加扰设备与数据相关的加扰器进行通信,并且从存储在数据的扰频器中选择的加扰序列加扰存储在缓冲器中的用户数据。
    • 86. 发明授权
    • Precompensation circuit for magnetic recording
    • 磁记录预补偿电路
    • US07184231B1
    • 2007-02-27
    • US11250373
    • 2005-10-17
    • Pantas SutardjaChi Fung Cheng
    • Pantas SutardjaChi Fung Cheng
    • G11B5/09
    • G11B20/10009G11B5/09H03L7/06
    • In a precompensation circuit for magnetic recording of data signals, a clock produces clock signals at a predetermined rate to clock the recording of the data signals. A clock delay generator generates clock delay data relative to the generated clock signals for successive data signals to be recorded. The clock delay data for each data signal is formed according to the states of a set of adjacent data signals. n>1 programmable clock delay units operate sequentially to control the recording times of the successive data signals. Each clock delay unit receives the clock delay data for one data signal in each sequence of n successive data signals and determines recording time of the one data signal according to the clock delay data for the one data signal in the sequence.
    • 在用于数据信号的磁记录的预补偿电路中,时钟以预定速率产生时钟信号以对数据信号的记录进行时钟。 时钟延迟发生器相对于所记录的连续数据信号产生的时钟信号产生时钟延迟数据。 根据一组相邻数据信号的状态,形成每个数据信号的时钟延迟数据。 n> 1个可编程时钟延迟单元依次操作以控制连续数据信号的记录时间。 每个时钟延迟单元在n个连续数据信号的每个序列中接收一个数据信号的时钟延迟数据,并根据序列中的一个数据信号的时钟延迟数据确定一个数据信号的记录时间。
    • 87. 发明授权
    • Electrostatic discharge protection circuit for magneto-resistive read elements
    • 用于磁阻读取元件的静电放电保护电路
    • US07167331B1
    • 2007-01-23
    • US10877033
    • 2004-06-25
    • Pantas Sutardja
    • Pantas Sutardja
    • G11B5/02G11B5/127G11B5/09
    • G11B5/40
    • A magnetic storage system includes a read element including a tunneling giant magneto-resistive (TGMR) sensor. A shunting device includes a control terminal and first and second terminals that communicate with respective first and second terminals of the read element. The shunting device shorts said first and second terminals when said control terminal is not powered to protect the read element from electrostatic discharge. A first voltage limiting circuit limits voltage that is input to first terminals of said shunting device and said read element. Said first voltage limiting circuit includes first and second diodes. An anode of said first diode and a cathode of said second diode communicate with said first terminal of said read element and said first terminal of said shunting device and a cathode of said first diode and an anode of said second diode communicate.
    • 一种磁存储系统包括一个包含隧道式巨磁阻(TGMR)传感器的读取元件。 分流装置包括控制端子和与读取元件的相应第一和第二端子通信的第一和第二端子。 当所述控制端子未通电时,分流装置将所述第一和第二端子短路以保护所述读取元件免受静电放电。 第一限压电路限制输入到所述分流装置和所述读取元件的第一端子的电压。 所述第一限压电路包括第一和第二二极管。 所述第一二极管的阳极和所述第二二极管的阴极与所述读取元件的所述第一端子和所述分流装置的所述第一端子连通,并且所述第一二极管的阴极和所述第二二极管的阳极连通。
    • 88. 发明授权
    • Up-sampled filtering for servo demodulation
    • 用于伺服解调的上采样滤波
    • US07158333B1
    • 2007-01-02
    • US10682138
    • 2003-10-09
    • Pantas SutardjaMichael Madden
    • Pantas SutardjaMichael Madden
    • G11B5/596G11B5/09
    • G11B5/59622G11B5/556
    • An apparatus, method, and system for providing a fine adjustment for transducing head positioning in a hard disk drive (HDD). The apparatus, method, and system include reading a positioning error field wherein the resulting signal is a substantially sinusoidal position error signal (PES), filtering the PES to remove low frequencies and attenuate high frequencies, sample the filtered PES at a multiple of the channel frequency, filter the higher frequency harmonics, down sample the PES, and provide a signal proportional to the amplitude of the down sampled PES. This signal is the reference signal to the head positioning servo.
    • 一种用于提供用于在硬盘驱动器(HDD)中转换头部定位的微调的装置,方法和系统。 装置,方法和系统包括读取定位误差场,其中所得到的信号是基本上正弦的位置误差信号(PES),对PES进行滤波以去除低频并衰减高频,以频率倍数采样经滤波的PES 频率,滤波较高频率的谐波,向下采样PES,并提供与下采样PES幅度成比例的信号。 该信号是头定位伺服的参考信号。
    • 89. 发明授权
    • Acquistion timing loop for read channel
    • 读取通道的采集定时循环
    • US06594098B1
    • 2003-07-15
    • US09660392
    • 2000-09-12
    • Pantas Sutardja
    • Pantas Sutardja
    • G11B509
    • G11B20/10027G11B5/012G11B5/09G11B20/10009G11B20/1403
    • A signal from a storage medium is processed in a data channel to form digital data. An amplifier and a sampler convert the storage medium signal into a timed sample sequence. A first equalizer and adjuster operates to equalize the timed sample sequence and to adjust the gain of the amplifier and timing of the sampler in a preamble segment of the signal. A second equalizer and adjuster circuit to equalize the timed sample sequence for detection and to adjust the gain of the amplifier and the timing of the sampler operates in a user data segment of the signal. An FIR equalizing filter in the second equalizer and adjuster circuit is controlled by a set of parameters to accurately equalize a large range of waveforms in the user data segment of the signal and an FIR equalizing filter in the first equalizer and adjuster circuit is controlled by a smaller set of related set of parameters adapted to accommodate rapid adjustment during synchronization in the preamble segment of the signal.
    • 来自存储介质的信号在数据信道中被处理以形成数字数据。 放大器和采样器将存储介质信号转换为定时采样序列。 第一均衡器和调节器用于均衡定时采样序列,并调整放大器的增益和信号前导码段中的采样器的定时。 用于均衡用于检测的定时采样序列并调整放大器的增益并且采样器的定时的第二均衡器和调节器电路在信号的用户数据段中操作。 第二均衡器和调节器电路中的FIR均衡滤波器由一组参数控制,以精确地均衡信号的用户数据段中的大范围波形和第一均衡器中的FIR均衡滤波器,并且调节器电路由 较小的相关参数集合适于在信号的前导码段中的同步期间适应快速调整。