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公开(公告)号：US4362909A
公开(公告)日：1982-12-07
申请号：US142304
申请日：1980-04-21
CPC分类号： H04L5/1423 , H04B3/23
摘要： Echo canceler for use in a data transmission system, comprising two and four-wire connections and arranged to suppress echo signals occurring in the four-wire connection. This echo canceler is provided with an adjustable signal processing device to which the data signal to be transmitted is applied and which produces a synthetic echo signal. A signal formed by a received data signal and an echo signal is present in the receive path of the four-wire connection. From the signals in the receive path there is now subtracted the synthetic echo signal, in order to generate a residual signal.To adjust the signal processing device an adjusting device is connected thereto to which a digital control signal is applied, which is constituted by a digital version of the residual signal.In order to improve the quality of the residual signal which is obtained when the data signal to be transmitted comprises long trains of data symbols of the same type the residual signal is subjected to a high-pass filter operation and the digital version of the residual signal filtered thus is applied to the adjusting device as the control signal.
摘要翻译： 回波消除器用于数据传输系统，包括两线和四线连接，并被布置成抑制在四线连接中发生的回波信号。 这个回波消除器设有一个可调信号处理装置，要发射的数据信号被应用到该可调信号处理装置，并产生合成的回波信号。 由接收的数据信号和回波信号形成的信号存在于四线连接的接收路径中。 从接收路径中的信号中，现在减去合成回波信号，以产生残余信号。 为了调整信号处理装置，连接有调制装置的数字控制信号被应用到数字控制信号，该数字控制信号由残留信号的数字版本构成。 为了提高要发送的数据信号包含相同类型的数据符号的长串获得的残留信号的质量，残差信号经受高通滤波操作，并且剩余信号的数字版本 滤波后作为控制信号施加于调整装置。
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公开(公告)号：US4349889A
公开(公告)日：1982-09-14
申请号：US168211
申请日：1980-07-10
申请人： Hendricus C. van den Elzen , Petrus J. Van Gerwen , Wilfred A. M. Snijders , Nicolaas A. M. Verhoeckx
发明人： Hendricus C. van den Elzen , Petrus J. Van Gerwen , Wilfred A. M. Snijders , Nicolaas A. M. Verhoeckx
CPC分类号： H04L25/03038
摘要： Arrangement having a non-recursive filter and means for weighting a sequence of delayed versions of the input signal in accordance with a sequence of coefficients which are each adjusted iteratively by positive and negative correction steps, respectively, with variable step-sizes, the step-size parameter being selected for each iteration and for each coefficient by means of a run-length detector to which the sign of each correction step is applied and which selects a larger or a smaller step-size parameter depending on the number of correction steps having the same sign and preceding the relevant iteration.Use: echo canceller, equalizer.
摘要翻译： 具有非递归滤波器的装置和用于根据系数序列对输入信号的延迟版本序列进行加权的装置，该系列序列分别通过具有可变步长的正和负校正步骤反复地进行调整， 通过使用每个校正步骤的符号的游程长度检测器对每个迭代选择每个系数的大小参数，并且根据具有该校正步骤的校正步骤的数量来选择更大或更小的步长参数 相同的符号，并在相关迭代之前。 使用：回波消除器，均衡器。
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公开(公告)号：US4150404A
公开(公告)日：1979-04-17
申请号：US899287
申请日：1978-04-24
CPC分类号： H04L25/4906 , G11B20/1426 , H03M5/00
摘要： A data recording device having a coding device which is supplied with a sequence of information bits to be recorded. The coding device forms coded information words of at least two different lengths from the sequence of information bits. The recording device further includes a divide-by-two member connected to the output of the coding device, a scrambler connected to the output of the divide-by-two member for scrambling the output signals of the divide-by-two member; and a write head connected to the output of the scrambler for recording the scrambled output signals.
摘要翻译： 一种具有编码装置的数据记录装置，其被提供有要被记录的信息比特序列。 编码装置从信息比特序列形成至少两个不同长度的编码信息字。 记录装置还包括连接到编码装置的输出的二分之一构件，连接到二分之一构件的输出的扰频器，用于对分频器构成的输出信号进行加扰; 以及连接到加扰器的输出的写入头，用于记录加扰的输出信号。
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