公开(公告)号：US5623377A

公开(公告)日：1997-04-22

申请号：US222666

申请日：1994-04-04

Applicant: Richard T. Behrens ,  Neal Glover ,  Trent O. Dudley ,  Alan J. Armstrong ,  Christopher P. Zook ,  William G. Bliss

Inventor： Richard T. Behrens ,  Neal Glover ,  Trent O. Dudley ,  Alan J. Armstrong ,  Christopher P. Zook ,  William G. Bliss

IPC: G11B5/09 ,  G11B20/10 ,  H03H17/02 ,  H03H17/06 ,  H04B3/06 ,  G11B5/035

CPC classification number: H03H17/06 ,  G11B20/10009 ,  G11B5/09 ,  H03H17/02

Abstract: A filter for compensating discrete secondary pulse formations associated with a data stream of discrete main pulses produced from data read from magnetic media. The filter's impulse response comprises a center coefficient with side compensating coefficients for attenuating the secondary pulses when the input signal is convolved with the impulse response. The magnitude and delay of the compensation coefficients are programmable and are adaptively adjusted to optimize the impulse response for a given environment. In a traditional FIR embodiment, two delay lines are used to generate the two programmable delays between the center coefficient and side compensation coefficients. In the preferred embodiment, an IIR filter provides the two programmable delays using only one delay line thereby reducing the size and cost of the circuit. Also in the preferred embodiment, the data stream is interleaved into an even and odd data stream and processed in parallel by two filters in order to double the throughput. Further, the pre-cursor correcting portion of the filter can be disabled in order to avoid delaying the data stream while still canceling the post-cursor secondary pulses. The filter also comprises attenuation and adder means to match the coincident sample values in amplitude and add them to substantially eliminate the effect of the secondary pulses in the discrete data stream.

Abstract translation: 用于补偿与从磁介质读取的数据产生的离散主脉冲的数据流相关联的离散次级脉冲形成的滤波器。 滤波器的脉冲响应包括具有侧补偿系数的中心系数，用于当输入信号与脉冲响应卷积时衰减次级脉冲。 补偿系数的幅度和延迟可编程，并进行自适应调整，以优化给定环境的脉冲响应。 在传统的FIR实施例中，使用两条延迟线来产生中心系数和侧面补偿系数之间的两个可编程延迟。 在优选实施例中，IIR滤波器仅使用一个延迟线提供两个可编程延迟，从而减小电路的尺寸和成本。 同样在优选实施例中，数据流被交织成偶数和奇数数据流，并且由两个滤波器并行处理，以使吞吐量翻倍。 此外，可以禁用滤波器的前光标校正部分，以避免在仍然取消后光标次级脉冲的同时延迟数据流。 滤波器还包括衰减和加法器装置，以使幅度上重合的采样值相匹配，并将它们相加，以基本上消除离散数据流中次级脉冲的影响。

公开(公告)号：US5504778A

公开(公告)日：1996-04-02

申请号：US353437

申请日：1994-05-23

Applicant: Vincent Carriere

Inventor： Vincent Carriere

IPC: H03H11/04 ,  H04B3/06 ,  H04L25/00 ,  H04L25/03 ,  H04B1/38

CPC classification number: H04L25/00

Abstract: So as to be directly connected to the predefined logic circuit PLC to form a baseband modem, the analog circuit BBAC is monolithically integrated in accordance with the CMOS technology, using switched-capacitor filters which are driven by only one clock. The automatic equalizer EGA is likewise designed from switched-capacitor filters, equalization being obtained by variable and symmetrical clipping of the signals. In these conditions the modem can operate automatically in a very wide range of data rates.

Abstract translation: 为了直接连接到预定逻辑电路PLC以形成基带调制解调器，模拟电路BBAC根据CMOS技术单片集成，使用仅由一个时钟驱动的开关电容滤波器。 自动均衡器EGA同样由开关电容滤波器设计，通过信号的可变和对称限幅获得均衡。 在这些情况下，调制解调器可以在非常广泛的数据速率下自动运行。

公开(公告)号：US5500757A

公开(公告)日：1996-03-19

申请号：US251581

申请日：1994-05-31

Applicant: Cornelis M. De Blok

Inventor： Cornelis M. De Blok

IPC: H04B3/06 ,  H03K5/13 ,  H04B10/00 ,  H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/26 ,  H04B10/28 ,  H04L7/00 ,  H04L7/027 ,  H04L7/033

CPC classification number: H04L7/027 ,  H03K5/13 ,  H04L7/0087 ,  H04L7/0041

Abstract: Optical receiving system, incoming unipolar pulses being converted into bipolar pulses having a constant top amplitude (elements 2, 3 and 4) which, on the one hand, are used for generating replicas of the original pulses, but having a constant top amplitude (element 5) and, on the other hand, for eliminating mutual phase differences by means of phase comparison with local clock pulses (elements 7..14). The latter is preferably effected by the bipolar pulses being multiplied (element 7) by the clock pulses, and by using the resulting DC signal to control a controllable delay element (8).

Abstract translation: 光接收系统，输入单极性脉冲被转换为具有恒定顶部振幅（元件2,3和4）的双极脉冲，其一方面用于产生原始脉冲的复制品，但具有恒定的顶部幅度（元件 另一方面，通过与本地时钟脉冲（元件7..14）的相位比较来消除相互相位差。 后者优选地通过双倍脉冲与元件7相乘时钟脉冲，并且通过使用得到的DC信号来控制可控延迟元件（8）来实现。

公开(公告)号：US5378937A

公开(公告)日：1995-01-03

申请号：US905724

申请日：1992-06-29

Applicant: Rolf Heidemann ,  Heinz Krimmel ,  Bernhard Junginger

Inventor： Rolf Heidemann ,  Heinz Krimmel ,  Bernhard Junginger

IPC: H03H7/01 ,  H04B3/04 ,  H04B3/06 ,  H04B10/2507 ,  H04B10/2513 ,  H03K3/26 ,  G06G7/12 ,  H03G11/04 ,  H03H5/00

CPC classification number: H04B10/2507 ,  H04B10/25137

Abstract: To compensate for nonlinear signal distortions in analog optical communication transmission systems, caused by laser chirps and the chromatic dispersion of the optical fiber, an equalizer in the form of an LC component is known, whose capacitance is formed by a variable capacitance diode. However, the known equalizer functions only when the capacitance has the proper polarity, which cannot be predicted because of possible polarity inversion during signal transmission. According to the invention, the variable capacitance diode (C.sub.a) has another variable capacitance diode (C.sub.b), with the opposite polarity, connected in parallel, and is equally biased in the high-resistance direction. By adjusting the bias voltage of both capacitances, it can be achieved that one of the two variable capacitance diodes takes over the equalization function, and the other is practically inoperative. Further developments of this solution concern keeping the frequency response constant during adjustment of the equalization, by means of a capacitance connected in parallel to the variable capacitance diodes (C.sub.a, C.sub.b), and the equalization of large bandwidth signals by an LC chain circuit with LC components according to the invention.

Abstract translation: 为了补偿由激光啁啾引起的模拟光通信传输系统中的非线性信号失真和光纤的色散，已知一种LC分量形式的均衡器，其电容由可变电容二极管形成。 然而，已知的均衡器仅在电容具有适当的极性时起作用，这在信号传输期间由于可能的极性反转而不能被预测。 根据本发明，可变电容二极管（Ca）具有另一个具有相反极性的可变电容二极管（Cb），并联连接，并且在高电阻方向上被均等地偏置。 通过调整两个电容的偏置电压，可以实现两个可变电容二极管中的一个取代均衡功能，另一个实际上不起作用。 该解决方案的进一步发展涉及通过与可变电容二极管（Ca，Cb）并联连接的电容以及通过具有LC的LC链电路来均衡大带宽信号来均衡调节均衡期间保持频率响应恒定 根据本发明的组分。

公开(公告)号：US5345476A

公开(公告)日：1994-09-06

申请号：US45555

申请日：1993-04-09

Applicant: Ichiro Tsujimoto

Inventor： Ichiro Tsujimoto

IPC: H04B1/10 ,  H04B1/12 ,  H04B3/06 ,  H04B15/00 ,  H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC classification number: H04B1/123

Abstract: An adaptive feedforward equalizer (12) has switched (N-1) tap-gain coefficients and a fixed tap-gain coefficient for the reference delay-line tap to operate on an incoming IF or baseband signal according to a first error signal (.epsilon..sub.1) representative of the difference between the input and output of a decision circuit (15). All tap-gain coefficients are active in the absence of an interference from an undesired source to cancel precursor distortion. The (N-1) tap-gain coefficients are nullified when such an interference is detected to reduce its precursor-cancelling capability. A first feedback equalizer (17) operates on the output of the decision circuit according to the first error signal to cancel postcursor distortion. A second feedback equalizer (18) nonlinearly filters the output of the decision circuit according to a second error signal (.epsilon..sub.2) and generates an estimate of a desired component of the output of the feedforward equalizer. The outputs of the second feedback equalizer (18) and the feedforward equalizer (12) are combined to produce the second error signal, or an estimate of an undesired component of the output of the feedforward equalizer. In the presence of the interference, the desired component estimate (.epsilon..sub.2) is combined with the outputs of the feedforward equalizer (12) and the first feedback equalizer (17) to produce an equalized signal for coupling to the decision circuit.

Abstract translation: 自适应前馈均衡器（12）具有根据第一误差信号（ε1）对参考延迟线抽头（N-1）抽头增益系数和固定抽头增益系数进行切换以对输入的IF或基带信号进行操作 ）表示决策电路（15）的输入和输出之间的差异。 在不存在来自不期望的源的干扰以消除前导失真的情况下，所有抽头增益系数是有效的。 当检测到这样的干扰以减少其前体消除能力时，（N-1）抽头增益系数被消除。 第一反馈均衡器（17）根据第一误差信号对判决电路的输出进行操作以消除后变形失真。 第二反馈均衡器（18）根据第二误差信号（ε2）非线性地滤波判决电路的输出，并产生前馈均衡器的输出的期望分量的估计。 第二反馈均衡器（18）和前馈均衡器（12）的输出被组合以产生第二误差信号或前馈均衡器的输出的不期望分量的估计。 在存在干扰的情况下，期望的分量估计（ε2）与前馈均衡器（12）和第一反馈均衡器（17）的输出组合以产生用于耦合到判决电路的均衡信号。

公开(公告)号：US5309481A

公开(公告)日：1994-05-03

申请号：US37952

申请日：1993-03-26

Applicant: Jerome J. Viviano ,  Teri C. Raynor

Inventor： Jerome J. Viviano ,  Teri C. Raynor

IPC: H04B3/06 ,  H04L25/03 ,  H04L27/38 ,  H04L27/08

CPC classification number: H04L25/03038 ,  H04L27/3872

Abstract: Apparatus for identifying (78) a signal point of a receive constellation corresponding to an extracted symbol of a train of symbols of a modulated communication signal and for adjusting (88) the signal point to a new position of the receive constellation based on the position of the extracted symbol in relation to the current position of the signal point. The new position of the identified signal point becomes part of the receive constellation for processing at least one subsequently extracted symbol of the communication signal. In addition, apparatus is provided for adjusting (120) equalizing coefficients of an equalizer (76) based on factors including an equalized extracted symbol, the identified signal point, corresponding extracted symbols of the equalizer, and an adaptive gain factor.

Abstract translation: 用于识别（78）与所提取的调制通信信号的符号序列的符号相对应的接收星座的信号点（78）的装置，并且用于基于所述接收星座的位置来调整（88）所述信号点到所述接收星座的新位置 提取的符号相对于信号点的当前位置。 所识别的信号点的新位置成为用于处理通信信号的至少一个随后提取的符号的接收星座的一部分。 此外，提供了用于基于包括均衡提取符号，所识别的信号点，均衡器的对应提取符号和自适应增益因子的因素来调整（120）均衡均衡器（76）的系数的设备。

公开(公告)号：US5305350A

公开(公告)日：1994-04-19

申请号：US535033

申请日：1990-06-08

Applicant: Dan Budin ,  Yoseph Linde ,  Gordon Saussy ,  Robert Snyder ,  Jack W. Lee

Inventor： Dan Budin ,  Yoseph Linde ,  Gordon Saussy ,  Robert Snyder ,  Jack W. Lee

IPC: H04B3/06 ,  H04L25/03

CPC classification number: H04B3/06

Abstract: A system is provided implementing an extremely high speed link allowing selection of either twisted pair (or like media) and fiber media in a single local area network to provide a high speed multimedia local area network. A high speed transmission link for twisted pair, coaxial cable media or the like is provided including a transmitter with a conversion device for receiving fiber optic data interface signals intended to drive a fiber optic data interface and for converting said fiber optic data interface signals into high speed transmission link signals of a form suitable to drive a shielded twisted pair medium. A receiver is provided including reconversion apparatus for regenerating the signal received from the shielded twisted pair medium back to an adequate signal level. The transmitter conversion device includes a buffer cooperating with an equalizer and a filter for forming the high speed transmission link signal. The equalizer provides frequency domain compensation for the characteristics of the shielded twisted pair medium. The filter rejects signals outside a band of data signaling. The receiver reconversion apparatus includes a filter connected to said twisted pair medium to reject signals outside a band of data signaling and to limit radiated emissions and a buffer for regenerating the signal received from the shielded twisted pair and filtration by said filter and regenerating the signal back to an adequate signal level.

Abstract translation: 提供了一种实现极高速链路的系统，允许在单个局域网中选择双绞线（或类似介质）和光纤介质，以提供高速多媒体局域网。 提供了用于双绞线，同轴电缆介质等的高速传输链路，包括具有用于接收光纤数据接口信号的转换装置的发射机，用于驱动光纤数据接口并将所述光纤数据接口信号转换成高 速度传输链路信号，适合于驱动屏蔽双绞线介质。 提供了一种接收机，包括用于将从屏蔽双绞线介质接收的信号再生回到足够的信号电平的再转换装置。 发射机转换装置包括与均衡器协作的缓冲器和用于形成高速传输链路信号的滤波器。 均衡器为屏蔽双绞线介质的特性提供频域补偿。 滤波器拒绝数据信号频带外的信号。 接收机再转换装置包括连接到所述双绞线介质的滤波器，以拒绝数据信号频带外的信号并限制辐射发射，以及用于再生从屏蔽双绞线接收的信号并由所述滤波器过滤并再生信号的缓冲器 达到足够的信号水平。

公开(公告)号：US5251237A

公开(公告)日：1993-10-05

申请号：US828531

申请日：1992-01-24

Applicant: Alfred Baier

Inventor： Alfred Baier

IPC: H03H15/00 ,  H03H17/00 ,  H03H21/00 ,  H04B3/06 ,  H04B7/26 ,  H04L1/20 ,  H04L13/18 ,  H04L25/02 ,  H04L25/03 ,  H04L25/04 ,  H04L27/00 ,  H03D1/04 ,  H03H7/30 ,  H04L27/14

CPC classification number: H04L25/03038 ,  H04L1/206 ,  H04L25/0216 ,  H04L2025/03407 ,  H04L2025/03585

Abstract: A digital data receiver is enabled to operate with good error correction of signals subject to high multi-path distortion, and to operate with lower power consumption as the incoming signal dispersion becomes less. A signal analyzer measures the quality of the received signal. The amount of error correction is then adjusted in accordance with the quality factor. An equalizer may be used having an adjustable number of filter stages, or a state model of the transmission channel may be used with controllable numbers of states, channel coefficients, data paths, or register lengths for storing path data.

Abstract translation: 数字数据接收器能够对遭受高多径失真的信号进行良好的纠错操作，并且随着输入信号色散变小而在较低的功耗下工作。 信号分析仪测量接收信号的质量。 然后根据品质因素调整纠错量。 可以使用具有可调数量的滤波器级的均衡器，或者可以使用传输信道的状态模型与可控数量的状态，信道系数，数据路径或用于存储路径数据的寄存器长度。

公开(公告)号：US5233635A

公开(公告)日：1993-08-03

申请号：US705569

申请日：1991-05-24

Applicant: Jukka A. Henriksson ,  Kimmo J. Raivio

Inventor： Jukka A. Henriksson ,  Kimmo J. Raivio

IPC: H04B3/06 ,  H04L25/03 ,  H04L27/01 ,  H04L27/38

CPC classification number: H04L27/38 ,  H04L2025/0342 ,  H04L2025/03477 ,  H04L2025/03611

Abstract: The invention relates to an adaptive receiving method and a receiver comprising an adaptive equalizing device for processing a received signal. The receiver further comprises an adaptive detector utilizing the self-organizing map principle and operationally connected after the adaptive equalizer. The adaptive equalizer is controlled on the basis of an error between a processed signal and a detected signal.

Abstract translation: 本发明涉及一种自适应接收方法和接收机，包括用于处理接收信号的自适应均衡装置（1）。 接收机还包括利用自组织映射原理并在自适应均衡器（1）之后可操作地连接的自适应检测器（2,3）。 基于处理信号（y（n））和检测信号（y'（n））之间的误差来控制自适应均衡器（1）。

公开(公告)号：US5164962A

公开(公告)日：1992-11-17

申请号：US697701

申请日：1991-05-09

Applicant: Toshihisa Nakai ,  Noriaki Kondoh

Inventor： Toshihisa Nakai ,  Noriaki Kondoh

IPC: H03H21/00 ,  H04B3/06 ,  H04L25/03

CPC classification number: H04L25/03038

Abstract: An adaptive equalizer in a digital receiver filters differentially encoded data bursts containing known data preceded and followed by user data. A storage means saves and restores filter coefficients and other values so that the known data can be filtered repeatedly. As the known data are repeatedly filtered, a known-data generating means generates different differential encodings of the known data as desired data which are compared with the filtered values to obtain error values for use in updating the filter coefficients. A comparator means selects the encoding that produces the smallest cumulative error. The known data are then filtered once more, using the selected encoding as desired data, after which adaptive filtering of user data continues.

Abstract translation: 数字接收机中的自适应均衡器对包含用户数据之前和之后的已知数据的差分编码数据脉冲串进行滤波。 存储装置保存和恢复滤波器系数和其他值，使得可以重复地过滤已知数据。 当已知数据被重复滤波时，已知数据产生装置将已知数据的不同差分编码生成作为与滤波值进行比较的所需数据，以获得用于更新滤波器系数的误差值。 比较器意味着选择产生最小累积误差的编码。 然后将已知数据再次过滤，使用所选择的编码作为所需数据，之后继续对用户数据进行自适应过滤。