公开(公告)号：US06778671B1

公开(公告)日：2004-08-17

申请号：US09210639

申请日：1998-12-14

申请人： David L. Graumann

发明人： David L. Graumann

IPC分类号： H04B320

CPC分类号： H04B3/23 ,  H04M9/082

摘要： In an echo cancellation system, an echo canceler has an echo channel signal input, a reference channel signal input and a control output, the two inputs being uncorrelated, and a delay buffer has an input for a reference channel signal, an output in communication with reference channel signal input and a control input in communication with the control output from the echo canceler.

摘要翻译： 在回波消除系统中，回波消除器具有回波信道信号输入，参考信道信号输入和控制输出，两个输入不相关，延迟缓冲器具有用于参考信道信号的输入，与 参考通道信号输入和与回波消除器的控制输出通信的控制输入。

公开(公告)号：US06735181B1

公开(公告)日：2004-05-11

申请号：US09603801

申请日：2000-06-26

申请人： Daniel Babitch

发明人： Daniel Babitch

IPC分类号： H04B320

CPC分类号： H04B1/525

摘要： A wireless transceiver featuring a compensating filter circuit with a frequency and optionally an amplitude response which has the same function as the composite of filter effects from the transmit side as well as from the intermediate frequency (IF) stage of the receive side. The compensating filtering approximately duplicates the effects of the phase lock loop on the transmit side and the effects of IF filtering on the receive side, as well as amplitude distortion in the detector, which would delay or distort the audio. Then, the compensated audio is added or subtracted, depending on phase considerations, from the receive signal so that the receive signal is free of filter artifacts.

摘要翻译： 一种无线收发器，其特征在于具有频率和可选的幅度响应的补偿滤波器电路，其具有与来自发送侧以及来自接收侧的中频（IF）级的滤波器效应的复合相同的功能。 补偿滤波近似重复了锁相环对发射侧的影响以及IF滤波对接收侧的影响以及检测器中的幅度失真，这将延迟或扭曲音频。 然后，根据接收信号，根据相位考虑，补偿或补偿补偿音频，使得接收信号没有滤波器伪影。

公开(公告)号：US06683859B1

公开(公告)日：2004-01-27

申请号：US09438619

申请日：1999-11-12

申请人： Peter R. Molnar ,  Takao Inoue ,  Matthew A. Pendleton

发明人： Peter R. Molnar ,  Takao Inoue ,  Matthew A. Pendleton

IPC分类号： H04B320

CPC分类号： H04B3/23 ,  H04L27/2626 ,  H04L27/2647

摘要： An echo canceler (34) includes a summing device (104) that subtracts a correction signal from a received signal, the difference of which represents the far-end signal with an error component. Instead of adapting its coefficients using the output of the summing device (104), the echo canceler (34) uses the difference between the input and output of a decision device (108) as an estimate of the error component alone. The estimate of the error component is then used to adapt the coefficients according to the adaptive least mean squares (LMS) algorithm. In one embodiment, the decision device (108) forms discrete multi-tone symbols based on the equalized output of the summing device. In this embodiment, the echo canceler (34) performs an inverse of the equalization step efficiently by replacing a division operation with a multiply operation and a corresponding power-of-two shift operation.

摘要翻译： 回波消除器（34）包括从接收信号中减去校正信号的求和装置（104），该差值表示具有误差分量的远端信号。 代替使用求和装置（104）的输出来适配其系数，回波消除器（34）使用决策装置（108）的输入和输出之间的差作为单独的误差分量的估计。 然后使用误差分量的估计来根据自适应最小均方（LMS）算法来适应系数。 在一个实施例中，判决设备（108）基于求和设备的均衡输出来形成离散多音调符号。 在本实施例中，回波消除器（34）通过用乘法运算和相应的二次幂移位运算来代替除法运算来有效地执行均衡步骤的逆。

公开(公告)号：US06678254B1

公开(公告)日：2004-01-13

申请号：US09304139

申请日：1999-05-03

申请人： Wei-jei Song

发明人： Wei-jei Song

IPC分类号： H04B320

CPC分类号： H04B3/234

摘要： An echo canceller is described with improved performance. The echo canceller is capable of maintaining audio quality with less consumption of processor cycles by initially segmenting coefficients corresponding to successive audio samples of a delay line into a predetermined number of segments. The coefficients are used in computing an echo estimate. Upon segmenting the coefficients, certain segments are assigned to a first segment group, where the coefficients of that group are updated more frequently than coefficients assigned to one or more of the remaining groups. In one embodiment, this grouping is achieved by periodically computing a cumulative magnitude of the coefficients of each segment for all coefficients of the segments and subsequently placing a lesser number of segments with the highest cumulative coefficient magnitudes into the first segment group. Of course, in lieu of cumulative magnitude calculations, the energy of the coefficients may be computed. In any event, the remainder of the segments may be placed into a second segment group or multiple groups that are updated less frequently than the first segment group.

摘要翻译： 回声消除器被描述为具有改进的性能。 回波消除器能够通过将对应于延迟线的连续音频样本的系数初始分割成预定数量的片段，从而以较少的处理器周期消耗来维持音频质量。 系数用于计算回波估计。 在对系数进行分段时，将某些段分配给第一段组，其中该组的系数比分配给一个或多个剩余组的系数更频繁地更新。 在一个实施例中，通过周期性地计算段的所有系数的每个段的系数的累积幅度并且随后将具有最高累积系数幅度的较少数量的段放置到第一段组中来实现该分组。 当然，代替累积幅度计算，可以计算系数的能量。 在任何情况下，其余的段可以被放置在第二段组或多个被更新的频率比第一段组更多的组。

公开(公告)号：US06674729B1

公开(公告)日：2004-01-06

申请号：US09546785

申请日：2000-04-11

申请人： Albert Daniel DuRee

发明人： Albert Daniel DuRee

IPC分类号： H04B320

CPC分类号： H04L49/3081 ,  H04L2012/563 ,  H04L2012/5653 ,  H04L2012/5671 ,  H04Q11/0478

摘要： A method and system provides connections to an ATM system and includes selective echo cancellation. The invention includes two interworking units, an echo canceller, and a signaling processor. The signaling processor receives and processes signaling to provide connection control instructions to the interworking units. The first interworking unit will accept a connection, and if the connection does not require echo cancellation, interwork the incoming connection with an ATM connection to the ATM system. If the incoming connection requires echo cancellation, the first interworking unit will interwork the incoming connection with an ATM connection to the second interworking unit. The second interworking unit will interwork the ATM connection with another connection to echo cancellation. After echo cancellation, the second interworking unit will interwork the connection from echo cancellation with another ATM connection to the ATM system.

摘要翻译： 方法和系统提供到ATM系统的连接并且包括选择性回波消除。 本发明包括两个互通单元，回波消除器和信令处理器。 信令处理器接收并处理信令以向交互单元提供连接控制指令。 第一个互通单元将接受连接，如果连接不需要回音消除，则将进入的连接与ATM连接连接到ATM系统。 如果进入连接需要回波消除，则第一互通单元将使进入的连接与第二互通单元的ATM连接互通。 第二个互通单元将ATM连接与另一个连接互通回声消除。 在回波消除之后，第二互通单元将使来自回声消除的连接与另一ATM连接到ATM系统互通。

公开(公告)号：US06611601B2

公开(公告)日：2003-08-26

申请号：US10047657

申请日：2002-01-15

申请人： Yasuhiro Terada ,  Minoru Matsui

发明人： Yasuhiro Terada ,  Minoru Matsui

IPC分类号： H04B320

CPC分类号： H04M9/082

摘要： An echo sound signal suppressing apparatus for suppressing an echo sound signal to ensure speech communication between a far-end speaker and a near-end speaker, comprising: first power value calculating means for calculating the power value of the second sound signal; second power value calculating means for calculating the power value of the echo replica sound signal produced by the echo replica sound signal producing means; echo sound suppressing means for suppressing the echo sound difference signal component outputted from the difference signal producing means to a minimum level with the power value of the second sound signal calculated by the first power value calculating means and the power value of the echo replica sound signal calculated by second power value calculating means with the near-end speaker sound signal component being allowed to pass therethrough, the echo sound suppressing means having an output terminal to the communication line to output the near-end speaker sound signal component under the condition that the echo sound signal component is reduced to its smallest level.

公开(公告)号：US06603743B2

公开(公告)日：2003-08-05

申请号：US10266408

申请日：2002-10-08

申请人： Fatih M. Ozluturk ,  Nadir Sezgin

发明人： Fatih M. Ozluturk ,  Nadir Sezgin

IPC分类号： H04B320

CPC分类号： H04B1/7103 ,  H04B1/7097 ,  H04B1/7107 ,  H04B1/71075 ,  H04B2201/70701

摘要： A global pilot and unwanted traffic signal canceler for a spread spectrum communication system receiver that reduces their contributive noise effects. The present invention effectively cancels the global pilot and unwanted, active traffic signals prior to decoding a desired traffic signal at the receiver. The system and method decreases the bit error rate (BER) yielding an increased signal-to-noise ratio.

公开(公告)号：US06263077B1

公开(公告)日：2001-07-17

申请号：US09028141

申请日：1998-02-23

申请人： Edward S. Zuranski ,  Kenneth D. Ko ,  Jamal Haque ,  Shrenik P. Patravali ,  Manuel I. Rodriguez ,  Keith A. Souders ,  Anthony A. Tzouris

发明人： Edward S. Zuranski ,  Kenneth D. Ko ,  Jamal Haque ,  Shrenik P. Patravali ,  Manuel I. Rodriguez ,  Keith A. Souders ,  Anthony A. Tzouris

IPC分类号： H04B320

CPC分类号： H04L1/0057 ,  H04L1/0002 ,  H04L1/0021 ,  H04L7/048 ,  H04L7/10 ,  H04L27/0002 ,  H04L47/10 ,  H04M11/062 ,  Y02D50/10

摘要： A digital subscriber line communication system does not require the use of a plain old telephone service (POTS) splitter in the resident's home. Digital signal-processing techniques are utilized to accommodate varying subscriber line conditions coming from POTS telephone equipment. The digital signal-processing techniques eliminate the need for a splitter by reducing susceptibility to distortion resulting from varying subscriber line characteristics. The digital subscriber line modem can utilize quadrature amplitude modulated (QAM) signals and frequency division multiplexing. The digital subscriber line modem includes a control circuit that implements an echo canceler and an analyzer to reduce near-end cross-talk noise. The analyzer performs spectral analysis to preemphasize or to predistort the transmitted signals in accordance with the cross-talk noise.

摘要翻译： 数字用户线路通信系统不需要在居民的家中使用普通老式电话服务（POTS）分离器。 利用数字信号处理技术来适应来自POTS电话设备的不同用户线路状况。 数字信号处理技术通过减少由于不同的用户线路特性导致的失真的敏感性，消除了对分路器的需要。 数字用户线路调制解调器可以利用正交幅度调制（QAM）信号和频分复用。 数字用户线路调制解调器包括实现回波消除器的控制电路和分析器，以减少近端串扰噪声。 分析仪执行频谱分析，以根据串扰噪声预加重或预失真发送的信号。

公开(公告)号：US06236645B1

公开(公告)日：2001-05-22

申请号：US09037328

申请日：1998-03-09

申请人： Oscar E. Agazzi

发明人： Oscar E. Agazzi

IPC分类号： H04B320

CPC分类号： H04B3/23 ,  H04B3/32 ,  H04B3/487

摘要： A communication line having a plurality of twisted wire pairs connects a plurality of transmitters, one transmitter at each end of each twisted wire pair, with a plurality of receivers, one receiver at each end of each twisted wire pair. Each receiver receives a combination signal including a direct signal from the transmitter at the opposite end of the twisted wire pair with which the receiver is associated and a plurality of far-end crosstalk (FEXT) impairment signals, one from each of the remaining transmitters at the opposite end of the communications line. A plurality of FEXT cancellation systems, one associated with each receiver, provides a replica FEXT impairment signal. A device associated with each receiver is responsive to the combination signal received by the receiver and the replica FEXT impairment signal provided by the FEXT cancellation system associated with the receiver for substantially removing the FEXT impairment signals from the combination signal. If necessary, a skew adjuster delays the arrival of the combination signal at the device so that the combination signal and the FEXT impairment signal arrive at the device at substantially the same time. A sequential decoder operates on signals from each of the plurality of wire pairs simultaneously to produce receiver outputs. A plurality of near-end crosstalk (NEXT) cancellation systems and echo cancellers remove NEXT and echo impairment signals from the combination signal.

摘要翻译： 具有多条双绞线的通信线路连接多个发射器，每条双绞线对的每一端的一个发射器与多个接收器，每个双绞线对的每一端连接一个接收器。 每个接收机接收组合信号，该组合信号包括来自发射机的直接信号，该信号位于与接收机相关联的双绞线对的相对端，以及多个远端串扰（FEXT）损伤信号，每个剩余发射机中的一个来自 通信线路的另一端。 与每个接收器相关联的多个FEXT取消系统提供复制FEXT损害信号。 与每个接收机相关联的设备响应于由接收机接收的组合信号和由与接收机相关联的FEXT取消系统提供的副本FEXT损伤信号，以从组合信号基本上去除FEXT损害信号。 如果需要，偏斜调整器将组合信号的到达延迟到设备，使得组合信号和FEXT损伤信号基本上同时到达设备。 顺序解码器对来自多个线对中的每一个的信号同时操作以产生接收器输出。 多个近端串扰（NEXT）消除系统和回波消除器从组合信号中去除NEXT和回波损害信号。

公开(公告)号：US06831900B2

公开(公告)日：2004-12-14

申请号：US09780661

申请日：2001-02-09

申请人： Roy B. Blake

发明人： Roy B. Blake

IPC分类号： H04B320

CPC分类号： H04B3/23

摘要： A filter cell, method of deriving an echo component and an echo canceling system, bit pump and transceiver employing the same. In one embodiment, the filter cell includes a first summing node that receives a first input based on a signal sample that contains an echo component of an echo. The filter cell also includes a second summing node that receives a second input based on the signal sample. The filter cell still further includes a multiplier that employs outputs from the first and second summing nodes and a scaling factor to derive first and second outputs containing a remnant of the echo component.

摘要翻译： 滤波器单元，导出回波分量的方法和回波消除系统，位泵和收发器。 在一个实施例中，滤波器单元包括第一求和节点，其基于包含回波的回波分量的信号样本接收第一输入。 滤波器单元还包括基于信号样本接收第二输入的第二求和节点。 滤波器单元还包括使用来自第一和第二求和节点的输出的乘法器和缩放因子来导出包含回波分量的残余物的第一和第二输出。