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    Echo canceller for a baseband data signal
    81.
    发明授权
    Echo canceller for a baseband data signal 失效
    回波消除器用于基带数据信号

    公开(公告)号：US4571465A

    公开(公告)日：1986-02-18

    申请号：US539584

    申请日：1983-10-06

    Applicant: Richard Brie ,  Loic B. Y. Guidoux

    Inventor： Richard Brie ,  Loic B. Y. Guidoux

    IPC: H04B3/23 ,  H04B3/20

    CPC classification number: H04B3/235 ,  H04B3/238

    Abstract: An echo canceller used in a data transmission modem for cancelling in the baseband signal of the receive path an echo signal .epsilon.(t) produced by the data signal from the transmit path. The echo canceller comprises a difference circuit for forming the difference between the signal from the receive path s(t)+.epsilon.(t) and a synthetic echo copy signal .epsilon.(t). The echo copy signal is formed by at least one transversal filter which operates at a sampling frequency equal to the frequency of the data and whose coefficients are adjusted to minimize the mean-square value of an error signal. This error signal e(n) at an actual sampling instant n of the filter is determined by forming the difference between the value of the output signal of the difference circuit at the instant n and the value of this signal at the preceding sampling instant (n-1), which has been multiplied by the ratio between the value of the data recovered at the instant n and the value of the data recovered at the instant (n-1). Also provided is a circuit for providing an error signal for controlling the filter coefficients as a function of the sign of the difference circuit out signals for the actual and previous sampling instants.

    Abstract translation: 一种在数据传输调制解调器中使用的回波消除器，用于在接收路径的基带信号中消除由来自发送路径的数据信号产生的回波信号ε（t）。 回波消除器包括用于形成来自接收路径s（t）+ε（t）的信号与合成回波复制信号ε（t）之间的差的差分电路。 回波复制信号由至少一个横向滤波器形成，该滤波器以等于数据频率的采样频率工作，并且其系数被调整以最小化误差信号的均方值。 滤波器的实际采样时刻n处的该误差信号e（n）通过形成时刻n的差分电路的输出信号的值与前一采样时刻（n -1），其乘以在时刻n恢复的数据的值与在时刻（n-1）恢复的数据的值之间的比率。 还提供了一种电路，用于提供用于控制滤波器系数的误差信号，作为实际和先前采样时刻的差分电路输出信号的符号的函数。

    COMMUNICATION DEVICE AND ECHO CANCELLATION METHOD THEREOF
    82.
    发明申请
    COMMUNICATION DEVICE AND ECHO CANCELLATION METHOD THEREOF 审中-公开

    公开(公告)号：US20190245673A1

    公开(公告)日：2019-08-08

    申请号：US16034165

    申请日：2018-07-12

    Applicant: ALi Corporation

    Inventor： Wei-Jian Lin ,  Zhi-Ming Zeng

    IPC: H04L5/14 ,  H04B3/23

    CPC classification number: H04L5/1461 ,  H04B3/235

    Abstract: A communication device and an echo cancellation method are provided. A digital echo canceller is coupled to a transmitting circuit and a receiving circuit to generate an echo energy indicator according to a digital output signal and a digital input signal. A transceiving front-end circuit receives the analog output signal and generates a hybrid interface signal. A hybrid fine-tune circuit generates a first and a second capacitance calibration signals according to the echo energy indicator. An analog echo cancellation circuit receives the first and second capacitance calibration signals, and includes a first and a second variable capacitors controlled by the first capacitance calibration signal and a third and a fourth variable capacitors controlled by the second capacitance calibration signal. The analog echo cancellation circuit receives the analog output signal and the hybrid interface signal, and generates the analog input signal according to the first and second capacitance calibration signals.

    Channel quality indicator for wireline channel degradation detection
    85.
    发明授权
    Channel quality indicator for wireline channel degradation detection 有权

    公开(公告)号：US09882747B2

    公开(公告)日：2018-01-30

    申请号：US15380965

    申请日：2016-12-15

    Applicant: Marvell World Trade Ltd.

    Inventor： Shaoan Dai ,  Zhenzhong Gu ,  Kok-Wui Cheong

    IPC: H03H7/40 ,  H04L25/03 ,  H04B3/493 ,  H04B3/23 ,  H04B17/309

    CPC classification number: H04L25/03057 ,  H04B3/23 ,  H04B3/235 ,  H04B3/237 ,  H04B3/493 ,  H04B17/309 ,  H04L25/03146 ,  H04L25/03885 ,  H04L2025/03802

    Abstract: Systems and techniques relating to channel degradation detection for communication systems are described. A described system includes an interface to transmit signals and receive signals via a channel that includes a cable; an echo canceller coupled with the interface, the echo canceller to perform echo cancellation based on echo tap values to remove portions of the transmitted signals that appear as echoes within the received signals; an equalizer coupled with the interface, the equalizer to perform signal equalization based on equalizer tap values, the equalizer tap values being determined based on at least a portion of the received signals to adjust an impulse response of the channel and reduce inter-symbol interference within the received signals; and circuitry configured to determine a return loss channel quality indicator of the channel based on the echo tap values, determine an insertion loss channel quality indicator of the channel based on the equalizer tap values, or both.

    Echo canceller for VOIP networks
    87.
    发明授权
    Echo canceller for VOIP networks 有权
    VOIP网络的回声消除器

    公开(公告)号：US09420114B2

    公开(公告)日：2016-08-16

    申请号：US13959991

    申请日：2013-08-06

    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)

    Inventor： Rafi Rabipour ,  Dominic Ho

    IPC: H04M9/08 ,  H04B3/23

    CPC classification number: H04M9/082 ,  H04B3/235

    Abstract: An echo canceller for an IP network includes an adaptive filter that models the echo path and generates an estimate of the echo signal from a receiving input signal. The echo canceller subtracts the estimate of the echo signal from a sending input signal to generate a sending output signal with reduced echo. Variation in the echo delay is detected. A delay circuit compensates for the changes in the echo delay to provide proper time-alignment between the estimate of the echo signal and the sending input signal so that the echo signal will be more effectively cancelled.

    Abstract translation: 用于IP网络的回声消除器包括自适应滤波器，其对回波路径建模并从接收输入信号产生回波信号的估计。 回波消除器从发送输入信号中减去回波信号的估计，以产生具有减少回波的发送输出信号。 检测回波延迟的变化。 延迟电路补偿回波延迟的变化，以在回波信号的估计和发送输入信号之间提供适当的时间对准，使得回波信号将被更有效地消除。

    Low-amplitude echo estimation for a received communication signal
    88.
    发明授权
    Low-amplitude echo estimation for a received communication signal 有权
    接收到的通信信号的低振幅回波估计

    公开(公告)号：US09008216B2

    公开(公告)日：2015-04-14

    申请号：US14150956

    申请日：2014-01-09

    Applicant: Coherent Logix, Incorporated

    Inventor： Jan D. Garmany

    IPC: H04L25/34 ,  H04B3/23 ,  H04L25/02 ,  H04L25/03 ,  H04L27/06 ,  H04B3/46 ,  H04L27/26

    CPC classification number: H04B3/235 ,  H04B3/493 ,  H04L25/022 ,  H04L25/0228 ,  H04L25/03159 ,  H04L25/03828 ,  H04L27/06 ,  H04L27/2613 ,  H04L27/2662 ,  H04L27/2695 ,  H04L2025/03414

    Abstract: A system and method for identifying minor echoes present in an input signal in the situation where a set of major echoes has already been identified from the input signal. The method includes: computing a spectrum F corresponding to a sum of the major echoes; computing a weighted power spectrum SM of the spectrum F; subtracting the weighted power spectrum SM from a weighted power spectrum PIN of the input signal to obtain a difference spectrum; performing a stabilized division of the difference spectrum by a conjugate of the spectrum F to obtain an intermediate spectrum; computing an inverse transform of the intermediate spectrum to obtain a time-domain signal; and estimating parameters one or more of the minor echoes from the time-domain signal. The echo parameters are usable to remove at least a portion of the one or more estimated minor echoes from the input signal.

    Abstract translation: 在已经从输入信号识别出一组主要回波的情况下，用于识别存在于输入信号中的次要回波的系统和方法。 该方法包括：计算对应于主要回波和的频谱F; 计算光谱F的加权功率谱SM; 从输入信号的加权功率谱PIN中减去加权功率谱SM以获得差分频谱; 通过光谱F的共轭来执行差分光谱的稳定分割以获得中间光谱; 计算中间频谱的逆变换以获得时域信号; 以及从时域信号估计一个或多个次要回波的参数。 回波参数可用于从输入信号中去除一个或多个估计的次要回波的至少一部分。

    Estimation of Low-Amplitude Echoes in a Received Communication Signal
    89.
    发明申请
    Estimation of Low-Amplitude Echoes in a Received Communication Signal 有权
    接收通信信号中低振幅回波的估计

    公开(公告)号：US20130223504A1

    公开(公告)日：2013-08-29

    申请号：US13860090

    申请日：2013-04-10

    Applicant: Coherent Logix Incorporated

    Inventor： Jan D. Garmany

    IPC: H04L25/03

    CPC classification number: H04B3/235 ,  H04B3/493 ,  H04L25/022 ,  H04L25/0228 ,  H04L25/03159 ,  H04L25/03828 ,  H04L27/06 ,  H04L27/2613 ,  H04L27/2662 ,  H04L27/2695 ,  H04L2025/03414

    Abstract: A system and method for identifying minor echoes present in an input signal in the situation where a set of major echoes has already been identified from the input signal. The method includes: computing a spectrum F corresponding to a sum of the major echoes; computing a weighted power spectrum SM of the spectrum F; subtracting the weighted power spectrum SM from a weighted power spectrum PIN of the input signal to obtain a difference spectrum; performing a stabilized division of the difference spectrum by a conjugate of the spectrum F to obtain an intermediate spectrum; computing an inverse transform of the intermediate spectrum to obtain a time-domain signal; and estimating parameters one or more of the minor echoes from the time-domain signal. The echo parameters are usable to remove at least a portion of the one or more estimated minor echoes from the input signal.

    Abstract translation: 在已经从输入信号识别出一组主要回波的情况下，用于识别存在于输入信号中的次要回波的系统和方法。 该方法包括：计算对应于主要回波和的频谱F; 计算光谱F的加权功率谱SM; 从输入信号的加权功率谱PIN中减去加权功率谱SM以获得差分频谱; 通过光谱F的共轭来执行差分光谱的稳定分割以获得中间光谱; 计算中间频谱的逆变换以获得时域信号; 以及从时域信号估计一个或多个次要回波的参数。 回波参数可用于从输入信号中去除一个或多个估计的次要回波的至少一部分。

    Method for impulse noise mitigation
    90.
    发明授权
    Method for impulse noise mitigation 有权
    脉冲噪声抑制方法

    公开(公告)号：US08385399B2

    公开(公告)日：2013-02-26

    申请号：US12725592

    申请日：2010-03-17

    Applicant: Shu-Fa Yang ,  Min-Chieh Chen ,  Ching-Kae Tzou

    Inventor： Shu-Fa Yang ,  Min-Chieh Chen ,  Ching-Kae Tzou

    IPC: H03H7/30

    CPC classification number: H04L27/2657 ,  H04B3/235 ,  H04J11/0066 ,  H04L25/03019 ,  H04L25/03159 ,  H04L27/2675 ,  H04L2025/03414 ,  H04L2025/03535

    Abstract: A method of noise mitigation in a multi-carrier communication system includes receiving a signal from a decision device, determining whether synchronization symbol update is enabled, updating at least one of frequency-domain equalizer (FEQ) coefficients or digital echo canceller (DEC) coefficients in synchronization symbol periods if the synchronization symbol update is enabled, determining whether data symbol update is performed if the synchronization symbol update is not enabled, determining whether a flag associated with the signal is set if the data symbol update is not performed, and updating at least one of FEQ or DEC coefficients associated with the signal in synchronization symbol periods if the flag is set.

    Abstract translation: 一种多载波通信系统中的噪声抑制方法包括从判决装置接收信号，确定是否启用同步符号更新，更新频域均衡器（FEQ）系数或数字回声消除器（DEC）系数中的至少一个系数 如果同步符号更新被使能，则确定在不启用同步符号更新的情况下是否执行数据符号更新，如果未执行数据符号更新，则确定与该信号相关联的标志是否被设置，并且在 如果标志被设置，则与同步符号周期中的信号相关联的FEQ或DEC系数中的至少一个。

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