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1.发明授权
公开(公告)号：US5790336A
公开(公告)日：1998-08-04
申请号：US893928
申请日：1997-07-15
CPC分类号： G11B5/09 , G11B5/02 , H03F3/45085 , H03F3/72 , G11B19/04
摘要： A recording apparatus including a magnetic write head and a write amplifier with capacitive current compensation. The write amplifier is made up of four current mirrors which are turned on two at a time by two switchable floating current sources connected between the input terminals of the current mirrors in order to produce a write current of alternating polarity through the write head. The parasitic capacitances across the write head and/or the parasitic capacitances of the write amplifier at the write terminals are neutralized by means of neutralizing capacitors. The high impedance at the terminals of the write head enables the common-mode voltage across the write head to be fixed at any desired voltage value by means of a common-mode circuit.
摘要翻译： 一种包括磁写头和具有电容电流补偿的写放大器的记录装置。 写放大器由四个电流镜组成，两个电流反射镜由连接在电流镜的输入端之间的两个可切换的浮动电流一次打开，以通过写头产生交替极性的写入电流。 写入端子上的写入放大器的写入头和/或寄生电容之间的寄生电容通过中和电容器被中和。 在写入头的端子处的高阻抗使得能够通过共模电路将写入头两端的共模电压固定在任何所需的电压值。
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2.发明授权Magnetic head write amplifier including current mirrors and switchable current sources 失效磁头写放大器，包括电流镜和可切换电流源
公开(公告)号：US5668676A
公开(公告)日：1997-09-16
申请号：US489191
申请日：1995-06-09
CPC分类号： G11B5/022 , G11B5/02 , H03K17/663
摘要： An apparatus for recording on a magnetic record carrier includes a write amplifier comprising four current mirrors which are turned on two at a time by two switchable floating current sources connected between the input terminals of the current mirrors in order to produce a write current of alternating polarity through a write head. The high impedance at the terminals of the write head enables the common-mode voltage across the write head to be fixed at any desired voltage value by means of a common-mode circuit. The symmetrical structure further enables the parasitic capacitances at the write terminals to be neutralized by means of neutralizing capacitors.
摘要翻译： 用于在磁记录载体上记录的装置包括写入放大器，其包括四个电流镜，每个电流镜由连接在电流镜的输入端之间的两个可切换的浮动电流源一次打开，以产生交替极性的写入电流 通过写头。 在写入头的端子处的高阻抗使得能够通过共模电路将写入头两端的共模电压固定在任何所需的电压值。 对称结构进一步使得写入端子处的寄生电容能够通过中和电容中和。
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3.发明授权Fast acquisition method for obtaining data from a transmission channel and a data receiver for carrying out this method 失效用于从传输信道获得数据的快速获取方法和用于执行该方法的数据接收机
公开(公告)号：US6118833A
公开(公告)日：2000-09-12
申请号：US919051
申请日：1997-08-27
CPC分类号： G11B20/10055 , G11B20/10009 , G11B20/1403 , G11B27/3027 , H04L7/041 , H04L7/10 , H04L7/0004 , H04L7/0062
摘要： A fast acquisition method is described that combines timing, gain and, if required, equalizer acquisition in one go with word synchronization. At the heart of the method is a preamble that begins with a repetition of identical words P whose length matches the code-word length. Preferably the method ends with a frame-sync word based on the bit-by-bit inverse of P. Main attractions of the technique are simplicity, speed, and robustness.
摘要翻译： 描述了一种快速捕获方法，其将时序，增益以及如果需要的话，均衡器采集与字同步结合在一起。 该方法的核心是以长度与码字长度匹配的相同字P的重复开始的前导码。 优选地，该方法基于P的逐位倒数以帧同步字结束。该技术的主要吸引力是简单性，速度和鲁棒性。
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公开(公告)号：US5557638A
公开(公告)日：1996-09-17
申请号：US212669
申请日：1994-03-10
申请人： Kevin D. Fisher , Ho W. Wong-Lam , Johannes W. M. Bergmans , Frits A. Steenhof , Johannes O. Voorman
发明人： Kevin D. Fisher , Ho W. Wong-Lam , Johannes W. M. Bergmans , Frits A. Steenhof , Johannes O. Voorman
IPC分类号： H04L25/03 , H03K5/08 , H03M13/23 , H04L25/06 , H04L25/12 , H04L25/30 , H04L25/34 , H04L25/49
CPC分类号： H03K5/088 , H04L25/061 , H04L25/12
摘要： In a digital transmission system including a transmitter (2) coupled via a channel (4) to a receiver (6) a detection signal r.sub.k is compared with a number of reference values to determine the destination symbols a.sub.k. Since the size of the received signal r.sub.k is not known in advance, the ratio between the detection signal and the reference values is to be determined by an adapting circuit (16) on the basis of the received signal and the decisions made. The problem may then occur that as a result of an initially erroneous value of the ratio between detection signal and reference values not a correct adaptation is made. By recognizing such a situation because specific values of the symbols a.sub.k are lacking, in such a situation said ratio can be brought to such a value by the correction circuit (18) that all the values of a.sub.k again occur.
摘要翻译： 在包括经由信道（4）耦合到接收机（6）的发射机（2）的数字传输系统中，将检测信号rk与多个参考值进行比较，以确定目的地符号+ E，cir a + EE k。 由于接收信号rk的大小预先不知道，所以检测信号与参考值之间的比率将由适配电路（16）根据接收到的信号和作出的决定来确定。 然后可能出现这样的问题，即由于检测信号和参考值之间的比率的最初错误的值不是正确的适应。 通过识别这种情况，因为缺少符号+ E，cir a + EE k的特定值，在这种情况下，可以通过校正电路（18）使所述比值达到这样的值，即所有的+ E， 再次出现cir a + EE k。
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公开(公告)号：US5570396A
公开(公告)日：1996-10-29
申请号：US240041
申请日：1994-05-06
CPC分类号： H04L7/0062
摘要： In a digital symbol receiver it is necessary to generate a clock signal with a correct frequency and phase, so that decisions a.sub.k about the value of transmitted symbols a.sub.k can be made at the right detection instants. A simple method of obtaining the desired clock signal is to adjust a VCO by means of a control signal obtained from the correlation of a detection signal r(t) with the detected symbols a.sub.k filtered by a symbol filter. The symbol filter may comprise a cascade connection of a differentiator and a filter which has a transfer function which is an estimate of the transfer function of a channel which supplies the transmitted symbols.
摘要翻译： 在数字符号接收机中，必须产生具有正确频率和相位的时钟信号，从而可以在正确的检测时刻进行关于发送符号ak的值的判决+ E，cir a + EE k。 获得期望的时钟信号的简单方法是通过从检测信号r（t）与由符号滤波器滤波的检测符号+ E，cir a + EE k的相关性获得的控制信号来调整VCO。 符号滤波器可以包括微分器和滤波器的级联连接，滤波器具有作为提供发送符号的信道的传递函数的估计的传递函数。
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公开(公告)号：US5461644A
公开(公告)日：1995-10-24
申请号：US86814
申请日：1993-07-02
CPC分类号： H03M13/6502 , H03M13/41
摘要： Viterbi detector for a channel having a memory length 1, where no more than two survivors with an associated difference metric are updated. In the prior-art Viterbi detector of this type the new difference metric is from the previous difference metric by use of a saturation function. If the channel parameters differ from the values assumed for the calculation of the difference metric, the performance of the prior-art detector will rapidly degrade. In the detector according to the invention the new difference metric is derived from a combination of the saturation function of the previous difference metric and a correction signal which is a measure for the channel parameter difference.
摘要翻译： 用于具有存储器长度1的通道的维特比检测器，其中不超过具有相关差异度量的两个幸存者被更新。 在这种类型的现有维特比检测器中，新的差异度量是通过使用饱和函数从先前的差值度量。 如果信道参数与计算差值度量的值不同，则现有技术检测器的性能将迅速降低。 在根据本发明的检测器中，新的差异度量是从先前差值度量的饱和函数和作为信道参数差的度量的校正信号的组合导出的。
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公开(公告)号：US5487085A
公开(公告)日：1996-01-23
申请号：US262726
申请日：1994-06-20
CPC分类号： H04L25/03038 , H04L2025/03477 , H04L2025/03617
摘要： In a digital transmission system comprising a transmitter (2) connected to a receiver (6) through a channel (4), this receiver comprises an equalizer (8) which includes an equalization filter (12) with output signals from which a sum weighted with weight factors is determined. The output signal of the equalizer is applied to a detector. According to the inventive idea a correction signal for correcting the coefficients w of the equalizer is derived from w.sub.k =w.sub.k-1 +Ma.sub.k e.sub.k, where a.sub.k is the vector of a plurality of successive detected symbols, and e.sub.k is a difference between the current input signal of the detector and a reconstructed ideal input signal of the detector.
摘要翻译： 在包括通过信道（4）连接到接收机（6）的发射机（2）的数字传输系统中，该接收机包括均衡器（8），该均衡器（8）包括均衡滤波器（12），输出信号与 确定体重因子。 均衡器的输出信号被施加到检测器。 根据本发明，用于校正均衡器的系数w的校正信号从wk = wk-1 +Mâkek导出，其中â是多个连续检测符号的向量，ek是当前输入信号之间的差 的检测器和重建的检测器的理想输入信号。
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