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公开(公告)号：US4885737A
公开(公告)日：1989-12-05
申请号：US176961
申请日：1988-04-04
申请人： Loic B. Y. Guidoux
发明人： Loic B. Y. Guidoux
CPC分类号： H04B3/23
摘要： Echo canceler associated with a modem utilizing amplitude and phase modulation of a carrier, the echo canceler comprising adaptive filters (16-1) to (16-p) producing signals which are combined in an adder (15) for forming a synthetic echo signal .epsilon.(n). The coefficients of these filters are adjusted to minimize the mean square value of the residual echo signal e(n)=.epsilon.(n)-.epsilon.(n), where .epsilon.(n) is the echo received. The echo canceler comprises a code conversion circuit (17) which receives a signal D(n) characterizing in each modulation interval the amplitude and phase state of the carrier to be transmitted and which produces distinct configurations of several numbers of values +1, -1 or 0, said distinct configurations corresponding to the distinct possible states of the carrier to be transmitted such that elementary signals D.sub.1 (n) to D.sub.p (n) are formed which are mutually independent in the mean and which are applied to the filters (16-1) to (16-p). These filters can then be realized in a simple way.
摘要翻译： 与调制解调器相关联的回波消除器利用载波的幅度和相位调制，回波消除器包括自适应滤波器（16-1）至（16-p）产生信号，该信号组合在加法器（15）中，用于形成合成回波信号ε （n）。 调整这些滤波器的系数以使残差回波信号e（n）=ε（n）-ε（n）的均方值最小化，其中ε（n）是接收的回波。 回波消除器包括代码转换电路（17），其接收在每个调制间隔中表征要发送的载波的幅度和相位状态的信号D（n），并产生若干数值+1，-1的不同配置 或0，所述不同的配置对应于要发送的载波的不同可能状态，使得形成基本信号D1（n）至Dp（n），其在均值中相互独立，并且被施加到滤波器（16- 1）〜（16-p）。 这些过滤器可以以简单的方式实现。
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2.发明授权Method and apparatus for measuring distant echo delay in an echo cancelling arrangement 失效用于测量回波消除装置中的远程回波延迟的方法和装置
公开(公告)号：US4577309A
公开(公告)日：1986-03-18
申请号：US562612
申请日：1983-12-19
摘要： Method and apparatus for measuring the delay of the distant echo in an echoancelling arrangement comprising a near echo canceller, a delay line and a distant echo canceller using the steps oftransmitting, by modulation of a carrier, a data sequence having a periodic autocorrelation function with sidelobes of negative or zero value, this sequence having a duration at least equal to the maximum value of the delay to be measured and a number of elements determined by the accuracy desired for measurement of the delay;calculating the correlation function between the data of a next transmitted sequence and the data formed by demodulating the received signal and storing calculated samples of the correlation function in a memory; and determining, among the samples stored, the sample corresponding to the maximum of the correlation function and the rank of that sample.
摘要翻译： 一种用于测量包括近回波消除器，延迟线和远距回波消除器的回波消除装置中的远距离回波的延迟的方法和装置，其使用以下步骤：通过调制载波来发送具有周期性自相关函数的数据序列 具有负值或零值的旁瓣，该序列具有至少等于待测量延迟的最大值的持续时间和由测量延迟所需的准确度确定的元素数量; 计算下一发送序列的数据与通过解调接收信号形成的数据之间的相关函数，并将相关函数的计算样本存储在存储器中; 并且在存储的样本中确定与相关函数的最大值和该样本的秩相对应的样本。
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公开(公告)号：US4355406A
公开(公告)日：1982-10-19
申请号：US203161
申请日：1980-11-03
申请人： Loic B. Y. Guidoux
发明人： Loic B. Y. Guidoux
摘要： A carrier detector in a modem provided with an echo canceler comprises a first detection circuit which processes the level of the echo canceler output signal. In addition, the detector comprises a second detection circuit which processes the level of the output signal of an amplitude regulator connected to the output of the echo canceler. This second detection circuit produces an indication of the carrier interruption in the range of the high carrier levels, in which the first circuit is not operative for detecting a carrier interruption.
摘要翻译： 具有回波消除器的调制解调器中的载波检测器包括处理回波消除器输出信号电平的第一检测电路。 此外，检测器包括第二检测电路，其处理连接到回波消除器的输出的幅度调节器的输出信号的电平。 该第二检测电路在高载波电平的范围内产生载波中断的指示，其中第一电路不能用于检测载波中断。
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4.发明授权Arrangement for the automatic resynchronization of a data transmission receiver 失效用于数据传输接收机自动重新同步的装置
公开(公告)号：US4180705A
公开(公告)日：1979-12-25
申请号：US838633
申请日：1977-10-03
CPC分类号： H04L27/2273 , H04L2027/0057 , H04L2027/0073
摘要： A resynchronization arrangement for a data receiver having an auto-adaptive equalizer and a demodulator which utilizes a local carrier phaselocked on the received carrier by means of a control loop comprising an integrating circuit. Starting from a signal indicating a synchronization loss the arrangement generates three command pulses: a first pulse makes the adjustable coefficients of the equalizer and the signal in the memory of the integrating circuit equal to zero; a second pulse is used for making a reduced number of coefficients of the equalizer operative immediately after the first pulse and for reducing the time constant of the integrating circuit; a third pulse is used to make the synchronization loss indication signal equal to zero a given period of time after the end of the second pulse. Resynchronization is obtained without the necessity of a return connection to the transmitter.
摘要翻译： 一种用于具有自适应均衡器和解调器的数据接收机的再同步装置，其利用通过包括积分电路的控制回路锁相在接收载波上的本地载波。 从指示同步损失的信号开始，该装置产生三个指令脉冲：第一脉冲使得均衡器的可调系数和积分电路的存储器中的信号等于零; 第二脉冲用于使紧邻第一脉冲之后的均衡器的系数减少，并减小积分电路的时间常数; 在第二脉冲结束之后的给定时间段，使用第三脉冲使同步丢失指示信号等于零。 获得重新同步，而不需要与发射机进行返回连接。
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5.发明授权Method of reducing the convergence time of an echo canceller and apparatus for carrying out said method 失效减少回波消除器的收敛时间的方法以及用于执行所述方法的装置
公开(公告)号：US4621173A
公开(公告)日：1986-11-04
申请号：US504200
申请日：1983-06-14
申请人： Loic B. Y. Guidoux
发明人： Loic B. Y. Guidoux
摘要： A method of reducing the convergence time of an echo canceller including a transversal filter having N coefficients comprises at least the following steps:transmission of a training data signal D(n) constituted by data transmitted at instants nT, T being the data interval, and being periodically reproduced after a duration LT at least equal to NT and having the property: ##EQU1## where d and d.sup.x are the value of the data signal D(n) and its complex conjugate value, respectively;calculation of the coefficients of the transversal filter carried out after the instant of appearance of the echo signal produced in response to said training signal in accordance with the expression: ##EQU2## where C and C.sub.o are the vectors of the N coefficients of the transversal filter at the beginning and at the end of the period of calculating the coefficients, respectively,e(n) is the difference signal,D.sup.x (n) is the vector of the complex conjugate values of the N data stored in the transversal filter, and.sigma..sup.2 is a constant term representative of the power of each of the transmitted data.Said method applied to a linear echo canceller permits of initializing the coefficients of the transversal filter of said echo canceller within a time 2NT, where NT is the duration of the echo.
摘要翻译： 减少包括具有N个系数的横向滤波器的回波消除器的收敛时间的方法至少包括以下步骤：通过在时刻nT，T作为数据间隔传输的数据构成的训练数据信号D（n）的发送，以及 在持续时间LT至少等于NT并且具有以下性质之后周期性地再现：其中d和dx分别是数据信号D（n）的值及其复共轭值; 在根据以下表达式响应于所述训练信号产生的回波信号出现之后执行的横向滤波器的系数的计算：其中C和Co是横向滤波器的N个系数的向量 在计算系数的周期的开始和结束时，e（n）分别是差分信号，Dx（n）是存储在横向滤波器中的N个数据的复共轭值的向量，sigma 2是表示每个发送数据的功率的常数项。 应用于线性回波消除器的所述方法允许在时间2NT内初始化所述回波消除器的横向滤波器的系数，其中NT是回波的持续时间。
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公开(公告)号：US4571465A
公开(公告)日：1986-02-18
申请号：US539584
申请日：1983-10-06
申请人： Richard Brie , Loic B. Y. Guidoux
发明人： Richard Brie , Loic B. Y. Guidoux
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US4549049A
公开(公告)日：1985-10-22
申请号：US514540
申请日：1983-07-18
申请人： Loic B. Y. Guidoux
发明人： Loic B. Y. Guidoux
摘要： The test arrangement is intended to test, for example, a modem whose transmitter and receiver are coupled to the transmission line by means of a hybrid junction and comprises an echo canceller. The test consists of comparing a test signal applied to the transmitter with the signal restituted by the receiver when the modem is fedback from the line side. The test arrangement comprises an adder one input of which receives the error signal coming from the echo canceller, the other input receiving, during the test the feedback signal, its output being connected to the receiver. Means have been provided to make the signal restituted by the receiver different from the test sequence, when the error signal of the echo canceller exceeds a threshold.
摘要翻译： 测试装置旨在测试例如其发射机和接收机通过混合结点耦合到传输线的调制解调器，并且包括回声消除器。 测试包括将应用于发射机的测试信号与当从线路侧反馈调制解调器时接收器恢复的信号进行比较。 测试装置包括一个加法器，一个输入端接收来自回波消除器的误差信号，另一个输入端在测试期间接收反馈信号，其输出端连接到接收器。 当回波消除器的误差信号超过阈值时，已经提供了使接收机不同于测试序列的信号恢复的装置。
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公开(公告)号：US4862450A
公开(公告)日：1989-08-29
申请号：US717476
申请日：1985-03-28
申请人： Loic B. Y. Guidoux
发明人： Loic B. Y. Guidoux
IPC分类号： H04B3/23
摘要： An arrangement for cancelling the composite echo signal formed by, for example, a linear component and a variable-phase component, comprises a linear echo canceller and a variable phase echo canceller, the difference circuits of these echo cancellers being arranged in cascade. The adjustable signal processing arrangements of each echo canceller are controlled for minimizing a predetermined function (mean square value or time average of this means square value), either of a residual echo signal appearing at the output of the difference circuit of this echo canceller itself or of a residual echo signal appearing at the output of the cascade arrangement of the difference circuits. In all cases the signal at the output of the linear echo canceller contains only a residual variable-phase signal which can be compensated for by the variable-phase echo canceller.
摘要翻译： 用于消除例如线性分量和可变相分量形成的复合回波信号的装置包括线性回波消除器和可变相位回波消除器，这些回波消除器的差分电路被级联布置。 控制每个回声消除器的可调信号处理装置，用于将出现在该回波消除器本身的差分电路的输出端的残差回波信号中的任何一个减小预定功能（均方值的平均值或平均值） 出现在差分电路的级联布置的输出处的残余回波信号。 在所有情况下，线性回波消除器的输出处的信号仅包含可由可变相回波消除器补偿的残余可变相位信号。
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9.发明授权Method and apparatus for initializing filter coefficients in an echo canceller 失效在回波消除器中初始化滤波器系数的方法和装置
公开(公告)号：US4645884A
公开(公告)日：1987-02-24
申请号：US574805
申请日：1984-01-30
CPC分类号： H04B3/238
摘要： The filter coefficients of an echo cancelling arrangement having a near echo canceller and a distant echo canceller are initialized in accordance with a method and apparatus wherein the following steps are performed:transmission of at least two training sequences each comprising a pair of complementary S and C sequences having autocorrelation functions such that, if added, their sidelobes cancel, each S and C sequence being followed by a variable time interval .DELTA., determined as a function of the measured distant echo delay .tau. so that a distant echo produced in response to a training sequence occurs immediately after the near echo produced in response to by a following training sequence;after the first training sequence transmitted, calculation of correlation signals giving the correlation between the received signal and reference signals derived from an S sequence and a C sequence respectively during the first half and the second half of a training sequence of a duration T;application of a delay T/2 to the correlation signal formed on the basis of the S sequence;production of a sum signal of said delayed correlation signal and the correlation signal formed on the basis of the C sequence; andon the basis of said sum signal, extraction of the coefficients of the echo cancellers during determined time windows.
摘要翻译： 根据其中执行以下步骤的方法和装置初始化具有近回波消除器和远程回波消除器的回波消除装置的滤波器系数：至少两个训练序列的传输，每个训练序列包括一对互补的S和C 具有自相关函数的序列，使得如果添加它们的旁瓣取消，则每个S和C序列之后是可变时间间隔DELTA，其被确定为测量的远程回波延迟τ的函数，使得响应于训练产生的远程回波 响应于以下训练序列产生的近似回波之后立即出现序列; 在发送的第一训练序列之后，计算在持续时间T的训练序列的前半部分和后半期分别给出从S序列和C序列导出的接收信号和参考信号之间的相关性的相关信号; 对基于S序列形成的相关信号应用延迟T / 2; 产生所述延迟相关信号的和信号和基于C序列形成的相关信号; 并且基于所述和信号，在确定的时间窗口期间提取回声消除器的系数。
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公开(公告)号：US4229825A
公开(公告)日：1980-10-21
申请号：US960369
申请日：1978-11-13
申请人： Loic B. Y. Guidoux
发明人： Loic B. Y. Guidoux
摘要： A circuit for the synchronization of the operating cycles of a digital arrangement with an external clock signal which arrangement includes a calculating unit and a circulating store which must produce a sequence of coefficients in a predetermined order at each cycle. The circuit has switching means for circulating the coefficients in the store either in series or word-by-word, means for producing a word clock, means for forming operating cycles synchronous with the word clock and for starting each operating cycle at each characteristic transition of the external clock signal appearing after the end of each cycle. The switching means are controlled to have the sequence of coefficients circulate in series once in each cycle and for having the coefficients circulate word-by-word for the remaining period of time.
摘要翻译： 一种用于使数字装置的操作周期与外部时钟信号同步的电路，该装置包括计算单元和循环存储器，其必须在每个周期以预定顺序产生系数序列。 该电路具有用于使存储器中的系数串联或逐字循环的切换装置，用于产生字时钟的装置，用于形成与字时钟同步的操作周期的装置，以及用于在每个特征转换处开始每个操作周期 外部时钟信号在每个周期结束后出现。 控制切换装置使系列序列在每个周期中串联一次，并且使得系数在剩余时间段内逐字循环。
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