-
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。
-
2.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。
-
公开(公告)号：US06288859B1
公开(公告)日：2001-09-11
申请号：US09257082
申请日：1999-02-24
IPC分类号： G11B509
CPC分类号： G11B20/10009 , G11B5/09
摘要： A device for write precompensation of data signals to be recorded on a magnetic medium, has an input for receiving input data signals and an output for supplying the output signals to be recorded, at least a plurality of the signal transitions in these output data signals being delayed with respect to the corresponding signal transitions in the input data signal, the signal path between the input and the output including a series arrangement of a filter circuit and a hysteresis circuit, the hysteresis circuit receiving the output signal of the filter circuit and supplying a binary signal as its output signal. This write precompensation device simply enables allowance to be made for the influence of a large number of preceding symbol values on a transition to be recorded. When the device is combined with a known write compensation device it suffices to use a simple filter.
摘要翻译： 一种要记录在磁介质上的数据信号的预补偿装置，具有用于接收输入数据信号的输入端和用于提供要记录的输出信号的输出端，这些输出数据信号中的至少多个信号转换为 相对于输入数据信号中的相应信号转变而延迟，输入和输出之间的信号路径包括滤波器电路和滞后电路的串联布置，滞环电路接收滤波器电路的输出信号并提供 二进制信号作为其输出信号。 该写入预补偿装置简单地允许对要记录的转换的大量先前符号值的影响进行限制。 当设备与已知的写入补偿设备组合时，就可以使用简单的过滤器。
-
4.发明授权Unreliability detector apparatus and reproduction apparatus provided with the unreliability detector apparatus 失效具有不可靠性检测装置的不可靠性检测装置和再生装置
公开(公告)号：US5974099A
公开(公告)日：1999-10-26
申请号：US135859
申请日：1998-08-18
CPC分类号： H04L25/067 , G11B20/10009
摘要： An unreliability detector apparatus for generating an unreliable decision signal in response to an input signal. An input terminal receives the input signal, a first comparator unit compares the input signal with a first threshold value and a second comparator unit compares the input signal with a second threshold value. A processor is provided for carrying out a function for determining whether a curve in an X-Y plane has at least one point in common with a predetermined line in the X-Y plane. The curve in the X-Y plane is obtained by plotting time equivalent signals values of the first and second comparator output signals along the Y- and X-axis respectively of the X-Y plane, while the predetermined line in the X-Y plane is formed by a first line interconnecting a first fixed point and a second fixed point and in which half plane a third fixed point is located. The three fixed points are obtained by plotting combinations of a first through a fourth signal value along the X- and Y-axis. The processor is adapted to generate the unreliable decision signal upon detecting that the curve has at least one point in common with the predetermined line. An apparatus for reading information from a record carrier may be provided with the unreliability detection apparatus.
摘要翻译： 一种用于响应于输入信号产生不可靠判定信号的不可靠性检测器装置。 输入端子接收输入信号，第一比较器单元将输入信号与第一阈值进行比较，第二比较器单元将输入信号与第二阈值进行比较。 提供处理器，用于执行用于确定X-Y平面中的曲线是否具有与X-Y平面中的预定线相同的至少一个点的功能。 XY平面中的曲线是通过分别沿着XY平面的Y轴和X轴绘制第一和第二比较器输出信号的时间等效信号值，而XY平面中的预定线由第一行 互连第一固定点和第二固定点，并且其中半平面位于第三固定点。 通过沿X轴和Y轴绘制第一至第四信号值的组合来获得三个固定点。 所述处理器适于在检测到所述曲线具有与所述预定线共同的至少一个点时产生所述不可靠判定信号。 用于从记录载体读取信息的装置可以设置有不可靠性检测装置。
-
公开(公告)号：US06381082B1
公开(公告)日：2002-04-30
申请号：US09439201
申请日：1999-11-12
IPC分类号： G11B502
CPC分类号： G11B7/00 , G01R33/09 , G11B5/012 , G11B5/02 , G11B5/09 , G11B20/10009 , G11B20/18 , G11B20/22 , G11B33/14 , G11B2005/0016 , G11B2005/0018
摘要： An arrangement for reading information from a record carrier, such as in a HDD, include a read head (Rmr1), an amplifier (74) for amplifying the signal read by the read head, an equalizer (76) for equalizing the signal read by the read head, and a bit detector (80) for detecting bits in the signal read by the read head. The invention, the arrangement further comprises a DC correction unit (78) for subtracting a correction value from an input signal in response to an error signal so as to obtain a DC corrected output signal. The bit detector (80) detects a sequence of bits based in the DC corrected output signal. Further, an error signal generating unit (82,83,85) is present for generating the error signal in response to the DC corrected output signal and the sequence.
摘要翻译： 用于从诸如HDD中的记录载体读取信息的装置包括读取头（Rmr1），用于放大读取头读取的信号的放大器（74），均衡器（76），用于对由 读头和用于检测由读头读取的信号中的位的位检测器（80）。 本发明还包括一个直流校正单元（78），用于响应误差信号从输入信号中减去一个校正值，以获得一个直流校正的输出信号。 位检测器（80）基于DC校正的输出信号检测位序列。 此外，存在用于响应于DC校正的输出信号和序列而产生误差信号的误差信号生成单元（82,83,85）。
-
6.发明授权Method and device utilizing erasure information as a reliability indicator in an information medium 失效在信息介质中使用擦除信息作为可靠性指示符的方法和装置
公开(公告)号：US6134065A
公开(公告)日：2000-10-17
申请号：US709500
申请日：1996-09-06
CPC分类号： G11B20/182 , G11B27/36
摘要： A method and a device in which information is written on a medium and is read out, and which establishes whether the information read is sufficiently reliable, and in which so-called erasure information is used to establish the influence of media defects and other imperfections on the occurrence of errors in a transmission system. The medium is, for example, a hard disk containing one or more bad spots whose location can be accurately detected. The implementation of the method makes accurate and fast computation of the bit error rate possible.
摘要翻译： 一种方法和装置，其中信息被写在介质上并被读出，并确定读取的信息是否足够可靠，并且使用所谓的擦除信息来建立媒体缺陷和其他缺陷的影响 在传输系统中发生错误。 该介质例如是包含一个或多个可以准确检测位置的不良点的硬盘。 该方法的实现使得误码率的准确和快速计算成为可能。
-
公开(公告)号：US6091558A
公开(公告)日：2000-07-18
申请号：US909919
申请日：1997-08-12
CPC分类号： G11B20/10212
摘要： A device for write precompensation of data signals to be recorded on a magnetic medium, which device has an input for receiving input data signals and an output for supplying output signals to be recorded, an integrator/limiter circuit which receives the input data signals and which supplies an output signal which is in synchronism with the data signal and whose amplitude varies substantially linearly as a function of time at positions where a signal transition appears in the data signal, which amplitude is limited within a data symbol interval; an adjustable filter which receives the input signals and supplies an output signal whose instantaneous values depend on the pattern of preceding and future signal transitions in the data signal; and a comparator circuit which through comparison of the output signal of the integrator/limiter circuit and the output signal of the filter produces the output signal in which at least some signal transitions of the input data signal can be shifted in time. An important aspect of the present invention is that with the output signal dt an arbitrary number of desired time shifts can be obtained rather than that, as in the prior art, only a choice can be made from a limited number of delay values.
摘要翻译： 一种用于写入预记录在磁介质上的数据信号的装置，该装置具有用于接收输入数据信号的输入端和用于提供要记录的输出信号的输出端，接收输入数据信号的积分器/限幅电路，以及哪个 提供与数据信号同步的输出信号，其幅度随着数据信号中出现信号转变的位置处的时间的函数而基本线性变化，该幅度被限制在数据符号间隔内; 可调滤波器，其接收输入信号并提供其瞬时值取决于数据信号中的先前和未来信号转换的模式的输出信号; 并且通过比较积分器/限幅器电路的输出信号和滤波器的输出信号的比较器电路产生其中输入数据信号的至少一些信号转换可以及时移位的输出信号。 本发明的一个重要方面是，通过输出信号dt，可以获得任意数量的期望时间偏移，而不是象现有技术那样，只能从有限数量的延迟值中进行选择。
-
8.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。
-
9.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。
-
10.发明授权Electronic circuit comprising complementary transconductors for filters and oscillators 失效电子电路包括用于滤波器和振荡器的互补跨导体
公开(公告)号：US5859566A
公开(公告)日：1999-01-12
申请号：US891821
申请日：1997-07-14
申请人： Johannes O. Voorman , Hugo Veenstra
发明人： Johannes O. Voorman , Hugo Veenstra
CPC分类号： H03H11/0422 , H03F3/343 , H03F3/45139 , H03F3/45542 , H03F2200/453 , H03F2203/45562
摘要： An electronic circuit comprises coupled transconductors (TR1 and TR2). The transconductors comprise two complementary differential pairs whose outputs are connected directly to two output terminals. Two diodes (P3, N3) are arranged in series between the common terminals of the differential pairs. The common-mode voltage of the differential pairs is available on the node between the two diodes. The common-mode voltage of the one transconductor (TR2) is used to control one of the bias current sources of the other transconductor (TR1) and, if desired, also that of the one transconductor (TR2). In this way the common-mode voltage on the output terminals of the other transconductor (TR1) is fixed.
摘要翻译： 电子电路包括耦合的跨导体（TR1和TR2）。 跨导体包括两个互补的差分对，其输出直接连接到两个输出端子。 两个二极管（P3，N3）串联布置在差分对的公共端子之间。 差分对的共模电压在两个二极管之间的节点上可用。 一个跨导体（TR2）的共模电压用于控制另一个跨导体（TR1）的偏置电流源之一，如果需要也可以控制一个跨导体（TR2）的偏置电流源。 以这种方式，另一个跨导体（TR1）的输出端上的共模电压是固定的。
-
-
-
-
-
-
-
-
-
搜索结果
52 条记录 (耗时 0.026 秒)
