公开(公告)号：US4577329A

公开(公告)日：1986-03-18

申请号：US539582

申请日：1983-10-06

申请人： Richard Brie ,  Loic B. Y. Guidoux

发明人： Richard Brie ,  Loic B. Y. Guidoux

IPC分类号： H03H21/00 ,  H04B3/04 ,  H04L25/03 ,  H03H7/30 ,  H03K5/159

CPC分类号： H04L25/03057

摘要： A self-adaptive equalizer for use in a data modem for correcting in the baseband a received data signal. The equalizer comprises a difference circuit for determining the difference between a received signal and a correction signal formed at a sampling frequency by a transversal filter having adjustable coefficients, and which produces a corrected signal which is applied to a decision circuit which recovers the data signal. The output of the decision circuit is applied to the transversal filter, the coefficients of which are adjusted so as to minimize the mean-square value of an error signal. The error signal at each actual sampling instant is formed by deriving the algebraic difference between the value of the corrected signal at that sampling instant and the value thereof at a previous sampling instant, the latter value being first multiplied by the ratio between the value of the recovered data signal at the actual sampling instant and the value thereof at the previous sampling instant.

摘要翻译： 一种在数据调制解调器中使用的自适应均衡器，用于在基带中校正接收到的数据信号。 均衡器包括差分电路，用于通过具有可调系数的横向滤波器来确定接收信号和采样频率形成的校正信号之间的差异，并产生校正信号，该校正信号被施加到恢复数据信号的判定电路。 决定电路的输出被应用于横向滤波器，其中的系数被调整以使误差信号的均方值最小化。 在每个实际采样时刻的误差信号是通过导出在该采样时刻的校正信号的值与其在先前采样时刻的值之间的代数差来形成的，后一个值首先乘以 在实际采样时刻恢复数据信号及其在先前采样时刻的值。

公开(公告)号：US4531220A

公开(公告)日：1985-07-23

申请号：US542837

申请日：1983-10-17

申请人： Richard Brie ,  Loic B. Y. Guidoux

发明人： Richard Brie ,  Loic B. Y. Guidoux

IPC分类号： H04B3/06 ,  H03H15/00 ,  H04B3/23 ,  H04L25/03 ,  H04B15/02

CPC分类号： H04B3/235 ,  H04B3/238

摘要： A receiver used in a data transmission modem having a receive path containing a baseband signal and clock signal, and a transmit path. An echo canceller is employed having a transversal filter connected to the transmit path for generating a synthetic echo signal. A self-adaptive equalizer includes a transversal filter connected to receive a data signal from the receive path. Subtracting means subtract the signals from the echo canceller and equalizer from the baseband signal in the receive path. The subtracting means output is sampled at a sampling rate which satisfies the Shannon criteria with respect to a transmit signal in the transmit path. The filter coefficients are controlled in response to the sampled signal. The second and third clocking signals for the echo canceller and transversal filter and self-adaptive equalizer transversal filter are derived from recovered clock signals. Circuit means are connected to the sampling circuit output for deriving first and second error signals for controlling the coefficients of the transversal filters of the echo canceller and self-adaptive equalizer.

摘要翻译： 在具有包含基带信号和时钟信号的接收路径的数据传输调制解调器中使用的接收机和发送路径。 使用具有连接到发射路径的横向滤波器以产生合成回波信号的回波消除器。 自适应均衡器包括连接以从接收路径接收数据信号的横向滤波器。 减法装置从接收路径中的基带信号中减去来自回波消除器和均衡器的信号。 相对于发送路径中的发送信号，减法装置输出以满足香农标准的采样率采样。 响应于采样信号来控制滤波器系数。 用于回波消除器和横向滤波器和自适应均衡器横向滤波器的第二和第三时钟信号源自恢复的时钟信号。 电路装置连接到采样电路输出，用于导出用于控制回波消除器和自适应均衡器的横向滤波器的系数的第一和第二误差信号。

公开(公告)号：US4571465A

公开(公告)日：1986-02-18

申请号：US539584

申请日：1983-10-06

申请人： Richard Brie ,  Loic B. Y. Guidoux

发明人： Richard Brie ,  Loic B. Y. Guidoux

IPC分类号： H04B3/23 ,  H04B3/20

CPC分类号： H04B3/235 ,  H04B3/238

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。