公开(公告)号：US4100604A

公开(公告)日：1978-07-11

申请号：US706703

申请日：1976-07-19

申请人： Donald A. Perreault

发明人： Donald A. Perreault

IPC分类号： H04B3/14 ,  G06F7/38

CPC分类号： H04B3/141

摘要： An automatic equalizer for calculating the equalization transfer function and applying same to equalize received signals. The initial calculation as well as the equalization proper are conducted entirely within the frequency domain. Overlapping moving window samplings are employed together with the discrete Fourier transformation and a sparse inverse discrete Fourier transformation to provide the equalized time domain output signals.

摘要翻译： 一种用于计算均衡传递函数并将其应用于均衡接收信号的自动均衡器。 初始计算以及均衡正确完全在频域范围内进行。 重叠移动窗口采样与离散傅里叶变换和稀疏离散傅立叶逆变换一起提供均衡的时域输出信号。

公开(公告)号：US4027258A

公开(公告)日：1977-05-31

申请号：US691808

申请日：1976-06-01

申请人： Donald A. Perreault

发明人： Donald A. Perreault

IPC分类号： H04L25/03 ,  H03H7/16

CPC分类号： H04L25/03038

摘要： An automatic equalizer for calculating the equalization transfer function and applying same to equalize signals received from a transmission channel. Time domain equalization is achieved using a transversal filter whose tap weights are calculated in the frequency domain during an initial training period.

摘要翻译： 一种用于计算均衡传递函数并将其应用于均衡从传输信道接收的信号的自动均衡器。 使用横向滤波器来实现时域均衡，该滤波器在初始训练期间在频域中计算其抽头权重。

公开(公告)号：US4225937A

公开(公告)日：1980-09-30

申请号：US943085

申请日：1978-09-18

申请人： Donald A. Perreault ,  Thomas C. Rich

发明人： Donald A. Perreault ,  Thomas C. Rich

IPC分类号： G06F17/14 ,  G06F15/34

CPC分类号： G06F17/141

摘要： To limit the accumulation of recursive computation errors while recursively calculating the discrete Fourier transform of an input signal in response to moving window sample sets of that signal, the dependent variables for the recursive calculations are periodically refreshed. One embodiment generates an error limited continuous discrete Fourier transform of the input signal through the use of duplicate channels which are periodically reinitialized in time staggered relationship and alternately switched on-line and off-line in time synchronism with the reinitialization process. Each of the channels of that embodiment is equipped to recursively calculate the discrete Fourier transform of the input signal so that while one channel is on line feeding recursively calculated transform coefficients to the outputs, the other channel or channels are off-line being reinitialized and then computing fresh sets of transform coefficients for subsequent on-line recursive calculations. Another embodiment performs essentially the same function through the use of an on-line main processing channel which recursively calculates the discrete Fourier transform coefficients of the input signal on the basis of successive sets of dependent variables which are computed in and supplied by a periodically reinitialized off-line auxiliary processing channel.

摘要翻译： 为了响应于该信号的移动窗口采样集递归计算输入信号的离散傅里叶变换，限制递归计算误差的积累，递归计算的因变量被周期性刷新。 一个实施例通过使用以时间交错关系周期性地重新初始化的重复通道来产生输入信号的误差限制的连续离散傅里叶变换，并且与重新初始化过程在时间上同步地交替地在线和离线地切换。 该实施例的每个通道被配置为递归地计算输入信号的离散傅里叶变换，使得当一个通道在线馈送递归计算的变换系数到输出时，其他通道或通道被离线重新初始化，然后 为随后的在线递归计算计算新的变换系数集合。 另一个实施例通过使用在线主处理通道执行基本相同的功能，该在线主处理通道基于在周期性重新初始化关闭中计算并由其提供的依赖变量的连续集合递归地计算输入信号的离散傅里叶变换系数 线辅助处理通道。

公开(公告)号：US4141072A

公开(公告)日：1979-02-20

申请号：US755093

申请日：1976-12-28

申请人： Donald A. Perreault

发明人： Donald A. Perreault

IPC分类号： H03H17/00 ,  H04B3/14 ,  H04B1/10 ,  G06G7/19 ,  H03H7/14

CPC分类号： H04B3/141

摘要： An automatic equalizer for calculating the equalization transfer function of a transmission channel and applying same to equalize received signals. Equalization coefficients are obtained using a mean square error criteria for convergence to the desired values.

摘要翻译： 一种自动均衡器，用于计算传输信道的均衡传递函数并将其应用于均衡接收的信号。 使用用于收敛到所需值的均方误差准则获得均衡系数。

公开(公告)号：US4106103A

公开(公告)日：1978-08-08

申请号：US706702

申请日：1976-07-19

申请人： Donald A. Perreault

发明人： Donald A. Perreault

IPC分类号： H04B3/14 ,  G06F7/38

CPC分类号： H04B3/141

摘要： An automatic equalizer for calculating the equalization transfer function and applying same to equalize received signals. The initial calculation as well as the equalization proper are conducted entirely within the frequency domain. Overlapping moving window samplings are employed together with the discrete Fourier transformation and a sparse inverse discrete Fourier transformation to provide the equalized time domain output signals.

摘要翻译： 一种用于计算均衡传递函数并将其应用于均衡接收信号的自动均衡器。 初始计算以及均衡正确完全在频域范围内进行。 重叠移动窗口采样与离散傅里叶变换和稀疏离散傅立叶逆变换一起提供均衡的时域输出信号。

公开(公告)号：US4027257A

公开(公告)日：1977-05-31

申请号：US691809

申请日：1976-06-01

申请人： Donald A. Perreault

发明人： Donald A. Perreault

IPC分类号： H03H17/00 ,  H04B3/14 ,  H03H7/16

CPC分类号： H04B3/141

摘要： An automatic equalizer for calculating the equalization transfer function of a transmission channel and applying same to equalize received signals. The initial calculation as well as the equalization proper are conducted entirely within the frequency domain. Equalization coefficients are obtained using successive approximations approaching the desired values. The equalization coefficients may be adjusted independently from each other inasmuch as these coefficients are not interdependent. Successive approximations of the coefficients differ by fixed increments of the real or imaginary components. A feedback circuit is utilized in generating the successive approximations wherein sign or polarity information is used to determine the adjustment necessary for convergence.

摘要翻译： 一种自动均衡器，用于计算传输信道的均衡传递函数并将其应用于均衡接收的信号。 初始计算以及均衡正确完全在频域内进行。 使用接近期望值的逐次逼近获得均衡系数。 均衡系数可以彼此独立地调整，因为这些系数不相互依赖。 系数的连续近似与实部或虚部的固定增量不同。 使用反馈电路来产生逐次逼近，其中使用符号或极性信息来确定收敛所必需的调整。