公开(公告)号：US4577309A

公开(公告)日：1986-03-18

申请号：US562612

申请日：1983-12-19

申请人： Bahman Barazeche ,  Roger P. J. Alexis ,  Loic B. Y. Guidoux

发明人： Bahman Barazeche ,  Roger P. J. Alexis ,  Loic B. Y. Guidoux

IPC分类号： G04F10/00 ,  H04B3/23 ,  H04J15/00 ,  H04B3/20

CPC分类号： H04B3/237 ,  H04B3/238

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。

公开(公告)号：US4645884A

公开(公告)日：1987-02-24

申请号：US574805

申请日：1984-01-30

申请人： Bahman Barazeche ,  Roger P. J. Alexis ,  Loic B. Y. Guidoux

发明人： Bahman Barazeche ,  Roger P. J. Alexis ,  Loic B. Y. Guidoux

IPC分类号： H04B3/23 ,  H04B3/20

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。