知搜-全球专利检索

  1. Login
  2. Sign Up

Search Results

149 records (took 0.02 seconds)

    Two-wire full duplex frequency division multiplex modem system having echo cancellation means
    51.
    发明授权
    Two-wire full duplex frequency division multiplex modem system having echo cancellation means 失效
    具有回波消除装置的双线全双工分频多路复用调制解调器系统

    公开(公告)号：US4799214A

    公开(公告)日：1989-01-17

    申请号：US944508

    申请日：1986-12-22

    Applicant: Takashi Kaku

    Inventor： Takashi Kaku

    IPC: H04B1/50 ,  H04B3/23 ,  H04L5/06 ,  H04L5/14 ,  H04B9/00

    CPC classification number: H04L5/06 ,  H04B3/23 ,  H04L5/143 ,  H04B3/235

    Abstract: A two-wire full duplex frequency division multiplex (FDM) modem system having a unit for cancelling a transmission signal, taking into consideration the line distortion characteristics. The FDM modem system includes two modem units connected through the two-wire full duplex transmission line.Each modem unit includes a unit for modulating a transmission data, a unit for synthesizing the modulated transmission signal and a reception signal, a unit for adding the signal from the synthesizing unit and a signal, a unit for demodulating the reception signal, and a unit for generating the signal supplied to the adding unit cancelling a transmission echo signal included in the signal from the synthesizing unit, from the signal modulated at the modulating unit and the signal from the adding unit. The adding unit subtracts the signal generated at the echo cancellation signal generation unit from the signal from the synthesizer unit.The FDM may further include a unit, for receiving the signal from the adder unit, passing a signal having the transmission frequency band, and supplying same to the echo cancellation signal generation unit as a signal for compressing the line characteristics.

    Abstract translation: 考虑到线路失真特性，具有用于消除发送信号的单元的双线全双工频分复用（FDM）调制解调器系统。 FDM调制解调器系统包括通过双线全双工传输线连接的两个调制解调器单元。 每个调制解调器单元包括用于调制发送数据的单元，用于合成调制的发送信号的单元和接收信号，用于将来自合成单元的信号和信号相加的单元，用于解调接收信号的单元和单元 用于产生提供给加法单元的信号，从在调制单元调制的信号和来自加法单元的信号中消除来自合成单元的信号中包括的发送回波信号。 加法单元从来自合成器单元的信号中减去在回波消除信号生成单元处生成的信号。 FDM还可以包括用于从加法器单元接收信号的单元，通过具有发送频带的信号，并将其作为用于压缩线路特性的信号提供给回波消除信号生成单元。

    Method and apparatus for adjusting a digital equalizing filter
    52.
    发明授权
    Method and apparatus for adjusting a digital equalizing filter 失效
    用于调整数字均衡滤波器的方法和装置

    公开(公告)号：US4727543A

    公开(公告)日：1988-02-23

    申请号：US9944

    申请日：1986-12-12

    Applicant: Anders G. Bauer

    Inventor： Anders G. Bauer

    IPC: H04B3/23 ,  H04B20060101 ,  H04B3/06 ,  H04B3/04

    CPC classification number: H04B3/235

    Abstract: In particular, there are provided in accordance with the invention a method and apparatus for adjusting a digital equalizing filter in a hybrid circuit in a telecommunication system for transmitting digital information in duplex on a single line pair with simultaneous adaptive echo elimination and adaptive elimination of noise caused by intersymbol interference, where a first and a second compensation signal (e(t), i(t)), which are respectively dependent on the stored parameters of a digital balance filter and an equalizing filter, are subtracted from a received signal (a(t)+e(t)+i(t)) to form a difference signal (r(t)) which is compensated for noise respectively caused by echoes and intersymbol interference, the balance filter parameters being corrected with the aid of a correction signal (.epsilon.B.sub..kappa.) dependent on the difference signal (r(t)). The equalizing filter parameters are adjusted with the aid of a further correction signal (.epsilon.U.sub..kappa.) formed by the balance filter correction signal (.epsilon.B.sub..kappa.) and the first compensation signal (e(t)) such that the further correction signal (.epsilon.U.sub..kappa.) will substantially agree with the balance filtercorrection signal (.epsilon.B.sub..kappa.), but obtain the value zero when the first compensation signal (e(t)) and the balance filter correction signal (.epsilon.B.sub..kappa.) are both positive simultaneously or negative simultaneously. There is thus prevented the correction sequence of the equalizing filter parameters when the balance filter parameters are changed in a direction such that the absolute value of the estimated echo (e(t)) increases.

    Abstract translation: PCT No.PCT / SE86 / 00162 Sec。 371日期：1986年12月12日 102（e）日期1986年12月12日PCT提交1986年4月8日PCT公布。 出版物WO86 / 06567 特别地，根据本发明，提供了一种用于在电信系统中的混合电路中调整数字均衡滤波器的方法和装置，用于在具有同时自适应的单线对上发送双工的数字信息 由符号间干扰引起的噪声的回波消除和自适应消除，其中分别取决于数字平衡滤波器和均衡滤波器的存储参数的第一和第二补偿信号（e（t），i（t））， 从接收信号（a（t）+ e（t）+ i（t））中减去以形成分别由回波和码间干扰引起的噪声补偿的差分信号（r（t）），平衡滤波器参数 借助于取决于差信号（r（t））的校正信号（εB kappa）进行校正。 借助于由平衡滤波器校正信号（εB kappa）和第一补偿信号（ê（t））形成的另外的校正信号（εU kappa）来调整均衡滤波器参数，使得进一步的校正信号（ε U kappa）将基本上与平衡滤波器校正信号（εB kappa）一致，但是当第一补偿信号（ê（t））和平衡滤波器校正信号（εBkappa）同时为正或负时获得零值 同时。 因此，当平衡滤波器参数在估计回波（ê（t））的绝对值增加的方向上改变时，因此阻止了均衡滤波器参数的校正序列。

    Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission
    53.
    发明授权
    Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission 失效
    联合自适应回波消除器和均衡器，用于双线全双工数据传输

    公开(公告)号：US4074086A

    公开(公告)日：1978-02-14

    申请号：US720999

    申请日：1976-09-07

    Applicant: David D. Falconer ,  Stephen B. Weinstein

    Inventor： David D. Falconer ,  Stephen B. Weinstein

    IPC: H04B3/06 ,  H04B3/20 ,  H04B3/23 ,  H04L5/14 ,  H04B3/24

    CPC classification number: H04B3/235 ,  H04L5/1423

    Abstract: An adaptive equalizer and echo canceller jointly respond to a common error difference between the actual output and the quantized digital output of a data receiver in a two-wire digital data transmission system to achieve simultaneous full-bandwith full-duplex operation. Two-wire transmission channels are typically terminated in hybrid balancing networks which because of their fixed impedances permit "echoes" of the transmitted signal to interfere with reception of the much weaker incoming signal. Both the equalizer and canceller are adaptively adjustable transversal structures.

    Abstract translation: 自适应均衡器和回波消除器联合地响应双线数字数据传输系统中数据接收机的实际输出和量化数字输出之间的共同误差，以实现全频带全双工操作。 两线传输通道通常在混合平衡网络中终止，因为它们的固定阻抗允许发射信号的“回波”干扰接收更弱的输入信号。 均衡器和消除器都是自适应调整的横向结构。

    ADAPTIVE FILTER WITH MANAGEABLE RESOURCE SHARING
    54.
    发明申请
    ADAPTIVE FILTER WITH MANAGEABLE RESOURCE SHARING 审中-公开

    公开(公告)号：US20180145725A1

    公开(公告)日：2018-05-24

    申请号：US15700528

    申请日：2017-09-11

    Applicant: NXP B.V.

    Inventor： Sujan PANDEY

    IPC: H04B3/23 ,  G06F9/38

    CPC classification number: H04B3/232 ,  G06F9/3891 ,  H03H21/0012 ,  H03H2218/08 ,  H04B3/234 ,  H04B3/235

    Abstract: The present application relates to an adaptive filter using manageable resource sharing and a method of operating the adaptive filter. The adaptive filter comprises a cluster controller configured for allocating each of several computational blocks to one of several clusters and a routing controller for configuring the routing of tapped delay signals by a routing logic to the respective cluster in accordance with an allocation of the tapped delay signals to the clusters. Each of computational blocks is configured for adjusting one filter coefficient, ci(n), in one cycle of an iterative procedure according to an adaptive convergence algorithm. The number of computational blocks is less than an order of the adaptive filter.

    Echo canceller used for voice communication
    57.
    发明授权
    Echo canceller used for voice communication 有权
    回声消除器用于语音通信

    公开(公告)号：US08792649B2

    公开(公告)日：2014-07-29

    申请号：US13058212

    申请日：2008-09-24

    Applicant: Atsuyoshi Yano

    Inventor： Atsuyoshi Yano

    IPC: H04B3/20 ,  H04M9/08

    CPC classification number: H04M9/082 ,  H04B3/235

    Abstract: An adaptive filter unit outputs a send-mid signal obtained by eliminating echo from a send-in signal, and a power comparing unit calculates a power ratio between received signal power and send-mid signal power. When a receiver ST detecting unit detects a single talk state at a receiving side, an acoustic coupling amount estimating unit estimates and updates the estimated amount of acoustic coupling from the power ratio. A residual echo power estimating unit estimates estimated residual echo power from the received signal power and the estimated amount of acoustic coupling, and a signal-to-echo ratio estimating unit estimates a ratio between the send-mid signal power and the estimated residual echo power. An amplitude suppression coefficient determining unit determines the amplitude suppression coefficient corresponding to the ratio, and an amplitude suppression unit amplitude suppresses the send-mid signal.

    Abstract translation: 自适应滤波器单元输出通过从发送信号消除回波而获得的发送中间信号，功率比较单元计算接收信号功率和发送中间信号功率之间的功率比。 当接收机ST检测单元在接收侧检测到单个通话状态时，声耦合量估计单元从功率比估计和更新估计的声耦合量。 残余回波功率估计单元根据接收信号功率和估计的声耦合量估计估计的残余回波功率，并且信号与回波比估计单元估计发送中间信号功率与估计的残余回波功率之间的比率 。 幅度抑制系数确定单元确定对应于该比率的振幅抑制系数，振幅抑制单元振幅抑制发送中间信号。

    Method and apparatus for networked modems
    58.
    发明授权
    Method and apparatus for networked modems 失效
    网络调制解调器的方法和装置

    公开(公告)号：US08711741B1

    公开(公告)日：2014-04-29

    申请号：US11807006

    申请日：2007-05-24

    Applicant: Sam Heidari ,  Hossein Dehghan ,  Sigurd Schelstraete

    Inventor： Sam Heidari ,  Hossein Dehghan ,  Sigurd Schelstraete

    IPC: H04J1/12 ,  H04J1/16 ,  H04B3/20 ,  H04J4/00 ,  H04L5/16

    CPC classification number: H04B3/20 ,  H04B3/235 ,  H04B3/54 ,  H04L5/0007 ,  H04L5/0044 ,  H04L5/0064 ,  H04L5/143 ,  H04L5/1461 ,  H04L27/265

    Abstract: Networked modems configurable to establish a communication system on a wired communication medium. Each modem includes: a network module, transmit and receive path modules and a frequency domain echo canceller. The network module is configured to communicate with network modules of remaining ones of the at least three modems to allocate bandwidth of the shared communications medium for at least two discrete point-to-point communication links between corresponding pairs of the at least three modems. The transmit and receive path modules are configured for multi-tone modulation and demodulation of communications on the wired communication medium and are responsive to the bandwidth allocation of the network module to concurrently process at least a first discrete point-to-point communication link with a first modem among remaining ones of the at least three modems and at least a second discrete point-to-point communication link with a second among remaining ones of the at least three modems. The frequency domain echo canceller is configured to substantially cancel leakage of the communications transmitted on the transmit path into the receive path and to enable each point-to-point communication link to support full duplex communications.

    Abstract translation: 网络调制解调器可配置为在有线通信介质上建立通信系统。 每个调制解调器包括：网络模块，发射和接收路径模块和频域回波消除器。 所述网络模块被配置为与所述至少三个调制解调器中的剩余调制解调器的网络模块通信，以为所述至少三个调制解调器的相应对之间的至少两个离散点对点通信链路分配共享通信介质的带宽。 发送和接收路径模块被配置用于有线通信介质上的通信的多频调制和解调，并且响应于网络模块的带宽分配来同时处理至少第一离散点对点通信链路 所述至少三个调制解调器的剩余的调制解调器中的第一调制解调器和至少三个调制解调器的剩余的调制解调器中的至少一个的至少第二离散点对点通信链路中的第二调制解调器。 频域回波消除器被配置为基本上消除在发送路径上发送的通信到接收路径的泄漏，并且使得每个点对点通信链路能够支持全双工通信。

    METHOD FOR ACOUSTIC ECHO CANCELLATION AND SYSTEM THEREOF
    60.
    发明申请
    METHOD FOR ACOUSTIC ECHO CANCELLATION AND SYSTEM THEREOF 有权
    声音消除的方法及其系统

    公开(公告)号：US20130322638A1

    公开(公告)日：2013-12-05

    申请号：US13487198

    申请日：2012-06-02

    Applicant: JUNGHSI LEE ,  HSU-CHANG HUANG

    Inventor： JUNGHSI LEE ,  HSU-CHANG HUANG

    IPC: H04B3/20 ,  H04L27/01

    CPC classification number: H04B3/235 ,  H04B3/238 ,  H04L25/0212 ,  H04L25/0224 ,  H04L25/03038

    Abstract: The spirit of the present invention is to vary the step size parameter in accordance with the error signal and the output acoustic signal, wherein the filter is easy to implement, nonparametric VSS-NLMS algorithm which employs the mean-square error and the estimated system noise power to control the step-size update. The new nonparametric VSS-NLMS algorithm has been shown to perform with fast convergence rate, good tracking, and low mis-adjustment. In comparison with existing VSS-NLMS algorithms, the proposed algorithm has demonstrated consistently superior performance both in convergence and for final error level relative to published algorithms in application on both simulated data and real speech data.

    Abstract translation: 本发明的精神是根据误差信号和输出声信号改变步长参数，其中滤波器易于实现，采用均方误差和估计的系统噪声的非参数VSS-NLMS算法 控制步长更新的权力。 新的非参数VSS-NLMS算法已经显示出具有快速收敛速度，良好跟踪和低误差调整的功能。 与现有的VSS-NLMS算法相比，所提出的算法在仿真数据和实际语音数据应用中相比于已发布的算法，在收敛和最终误差水平方面表现出一贯优异的性能。

Patent Agency Ranking