公开(公告)号：US4475211A

公开(公告)日：1984-10-02

申请号：US417753

申请日：1982-09-13

Applicant: William E. Mattis, Jr. ,  Chester J. Wolejsza, Jr. ,  Vasil Uzunoglu

Inventor： William E. Mattis, Jr. ,  Chester J. Wolejsza, Jr. ,  Vasil Uzunoglu

IPC: H04L27/01 ,  H03H7/36

CPC classification number: H04L27/01

Abstract: An adaptive equalizer performs equalization at IF, demodulates the input signal and then generates the equalization coefficients at baseband from the demodulated data. Coefficient updating can be done on a non-real time basis and coefficients for individual bursts stored in a coefficient memory for retrieval when the same burst occurs in the next frame, thus obtaining a pseudo-continuous equalization for each burst. The error signal is derived from demodulated equalized data and correlated with demodulated unequalized data to generate the correlation coefficients, and individual error signals from each channel can be combined into a single composite error signal for correlation purposes.

Abstract translation: 自适应均衡器在IF进行均衡，对输入信号进行解调，然后从解调数据生成基带的均衡系数。 可以在非实时基础上进行系数更新，并且当在下一帧中发生相同的突发时，存储在系数存储器中用于检索的各个突发的系数，从而获得每个突发的伪连续均衡。 误差信号是从解调的均衡数据导出的，并与解调的不相等的数据相关，以产生相关系数，并且每个信道的各个误差信号可以组合成单个复合误差信号进行相关。

公开(公告)号：US3990010A

公开(公告)日：1976-11-02

申请号：US511651

申请日：1974-10-03

Applicant: Jeffrey Henry Bennett

Inventor： Jeffrey Henry Bennett

IPC: H04J3/06 ,  H04L7/00 ,  H04L7/02 ,  H04L7/027 ,  H04L7/04 ,  H04L25/03 ,  H04L25/04 ,  H03H7/36

CPC classification number: H04L25/03019 ,  H04L7/005 ,  H04L7/0062 ,  H04L2007/047 ,  H04L7/027

Abstract: A data transmission system comprising an adaptive equalizer, the output of which is selectively adjusted and sampled for distortion equalization purposes, and means for varying the sampling time of the adaptive equalizer to effect greater distortion equalization.

Abstract translation: 一种包括自适应均衡器的数据传输系统，其输出被选择性地调整和采样用于失真均衡目的，以及用于改变自适应均衡器的采样时间以实现更大失真均衡的装置。

公开(公告)号：US3706055A

公开(公告)日：1972-12-12

申请号：US3706055D

申请日：1971-08-06

Applicant: THOMSON CSF

Inventor： DIEULESAINT EUGENE JEAN ,  HARTMAN PIERRE

IPC: H03H9/42 ,  H03H7/36 ,  H03H9/30

CPC classification number: H03H9/423

Abstract: THE PRESENT INVENTION RELATES TO CONTINUOUSLY ADJUSTABLE DELAY LINES BASED UPON PROPAGATION OF A SURFACE VIBRATIONAL WAVE IN A PIEZOELECTRIC WAVE GUIDE WHICH IS PROVIDED AT ITS EXTREMITIES WITH INTERDIGITATED COMB-SHAPED ELECTRODES. THE DELAY LINE IN ACCORDANCE WITH THE INVENTION COMPRISES AT LEAST ONE COMB STRUCTURE THE TEETH OF WHICH ARE LINKED TO A COMMON CONNECTION BY A SEMICONDUCTOR LAYER WHICH IS RENDERED LOCALLY CONDUCTIVE BY MEANS OF A DISPLACEABLE LIGHT SPOT. THIS TYPE OF LINE CAN BE UTILISED IN A FREQUENCY RANGE EXTENDING FROM ONE MEGACYCLE TO SEVERAL HUNDREDS OF MEGACYCLES, IN ORDER TO PRODUCE DELAYS ADJUSTABLE FROM A FRACTION OF A MICROSECOND TO SEVERAL TENS OF MICROSECONDS.

公开(公告)号：US3648171A

公开(公告)日：1972-03-07

申请号：US3648171D

申请日：1970-05-04

Applicant: BELL TELEPHONE LABOR INC

Inventor： HIRSCH DONALD

IPC: H04L25/03 ,  H03H7/36

CPC classification number: H04L25/03031

Abstract: The automatic time-domain equalizer is modified to improve its signal-to-noise and impulse-response dispersal performance by supplementing the basic prior art equalizer with a final equalizer whose tap attenuators are controlled by correlations of the output of the basic equalizer with a distortion error signal. The reference input to the final equalizer is the appropriately delayed signal to be equalized. Two cascade equalization sections substantially eliminate from the final output the noise and echo components that are normally generated in the basic equalizer when used alone.

Abstract translation: 修改自动时域均衡器以通过用最终均衡器补充基本现有技术的均衡器来改善其信噪比和脉冲响应分散性能，其最终均衡器的抽头衰减器由基本均衡器的输出与失真的相关控制 误差信号。 到最终均衡器的参考输入是要被均衡的适当延迟的信号。 两个级联均衡部分基本上从最终输出消除了当单独使用时通常在基本均衡器中产生的噪声和回波分量。

公开(公告)号：US3553733A

公开(公告)日：1971-01-05

申请号：US3553733D

申请日：1969-02-26

Applicant: WESTINGHOUSE ELECTRIC CORP

Inventor： BUCK DANIEL C

IPC: H01P1/19 ,  H01G3/26 ,  H03H7/36

CPC classification number: H01P1/19

Abstract: DESCRIBED IS AN INTERGITITAL WAVE CIRCUIT DEPOSITED ON A FERRITE FILM AND HAVING A DIRECT CURRENT MAGNETIC FIELD APPLIED IN THE PLANE OF THE INTERDIGITAL CIRCUIT TO PROVIDE A MICROWAVE DEVICE EMPLOYING GYROMAGNETIC MEDIA FOR PHASE SHIFT, FREQUENCY TRANSLATION, CIRCULATION AND THE LIKE.

公开(公告)号：US3544924A

公开(公告)日：1970-12-01

申请号：US3544924D

申请日：1968-09-25

Applicant: ERICSSON TELEFON AB L M

Inventor： FJALLBRANT TORE TORSTENSSON

IPC: H03H11/12 ,  H03H11/26 ,  H03H7/36 ,  H03H7/14

CPC classification number: H03H11/1213 ,  H03H11/26 ,  H03H11/265

公开(公告)号：US3516027A

公开(公告)日：1970-06-02

申请号：US3516027D

申请日：1968-08-05

Applicant: US ARMY

Inventor： WASILIK JOHN H

IPC: H03H9/42 ,  H03H7/36

CPC classification number: H03H9/423

公开(公告)号：US4061977A

公开(公告)日：1977-12-06

申请号：US687349

申请日：1976-05-17

Applicant: David M. Motley ,  Andrew M. Kameya

Inventor： David M. Motley ,  Andrew M. Kameya

IPC: H04B3/06 ,  H04L27/00 ,  H04L27/22 ,  H04L27/233 ,  H04L27/38 ,  H04M11/00 ,  H04M11/06 ,  H03H7/36

CPC classification number: H04L27/2332 ,  H04L2027/003 ,  H04L2027/0057 ,  H04L2027/0067

Abstract: A phase tracking network comprising a phase correction network for correcting at least some of the phase error of an input signal to provide a phase corrected signal having components in first and second channels and a detector responsive to the phase corrected signal for providing a detected signal having first and second components in the first and second channels. An error calculator provides a phase correction signal back to the phase correction apparatus which responds to the phase correction signal to correct the phase error of the input signal. The phase error signal contains substantially no noise from the first channel at least when the first component of the detected signal is zero and contains substantially no noise from the second channel at least when the second component of the detected signal is zero. This is accomplished by utilizing the error calculator to provide a first control signal which represents a first fixed value, zero, and a second fixed value when the first component of the detected signal is ideally positive and not zero, ideally zero, and ideally negative and not zero, respectively. The error calculator similarly provides a second control signal for the second component of the detected signal.

Abstract translation: 一种相位跟踪网络，包括用于校正输入信号的至少一些相位误差的相位校正网络，以提供在第一和第二声道中具有分量的相位校正信号，以及响应于相位校正信号的检测器，用于提供检测信号， 第一和第二通道中的第一和第二组件。 误差计算器向相位校正装置提供相位校正信号，该相位校正装置响应相位校正信号以校正输入信号的相位误差。 至少当检测到的信号的第一分量为零并且至少当检测到的信号的第二分量为零时，相位误差信号基本上不含有来自第一信道的噪声，并且基本上不含有来自第二信道的噪声。 这是通过利用误差计算器来提供表示第一固定值零和第二固定值的第一控制信号，当检测到的信号的第一分量理想地为正，而不是零时，理想地为零，理想地为负， 不分别为零。 误差计算器类似地为检测信号的第二分量提供第二控制信号。

公开(公告)号：US4037160A

公开(公告)日：1977-07-19

申请号：US635110

申请日：1975-11-25

Applicant: Predrag Miloradovic ,  Hans Schaffhauser

Inventor： Predrag Miloradovic ,  Hans Schaffhauser

IPC: H04B3/10 ,  H03H17/00 ,  H03H17/02 ,  H03H21/00 ,  H04L25/03 ,  H03H7/36

CPC classification number: H03H21/0012 ,  H04L25/03038

Abstract: A method of adjusting and readjusting an automatic corrector for a data signal transmission system, the corrector serving to restore pulse-amplitude-modulated signals which have suffered linear distortions in a transmission channel. A transversal filter of the corrector receives during a first adjustment phase a reference signal sequence transmitted over the transmission channel and an identical reference signal produced at the receiving end to produce error signals which serve to adjust the transversal filter coefficients stored in the corrector. The filter coefficients are subdivided into at least two groups and during the first phase one group of filter coefficients is calculated with a more attenuated error signal than the filter coefficients of the other group. In a second adjustment phase the filter coefficients of the transversal filter are readjusted in respect of alterations of the properties of the transmission channel, the error signal formed from the output signal of the transversal filter and the reference values for the latter signal being correlated with the data signal arriving at the input of the transversal filter.

Abstract translation: 一种调整和重新调整数据信号传输系统的自动校正器的方法，该校正器用于恢复在传输信道中遭受线性失真的脉冲幅度调制信号。 校正器的横向滤波器在第一调整阶段期间接收通过传输信道发送的参考信号序列和在接收端产生的相同参考信号，以产生用于调整存储在校正器中的横向滤波器系数的误差信号。 滤波器系数被细分为至少两组，并且在第一阶段期间，一组滤波器系数以比另一组的滤波器系数更多的衰减误差信号来计算。 在第二调整阶段，横向滤波器的滤波器系数关于传输信道的性质的改变重新调整，由横向滤波器的输出信号形成的误差信号和后一个信号的参考值与 数据信号到达横向滤波器的输入。

公开(公告)号：US3962637A

公开(公告)日：1976-06-08

申请号：US522642

申请日：1974-11-11

Applicant: David M. Motley ,  King Y. Cheng

Inventor： David M. Motley ,  King Y. Cheng

IPC: H04L25/03 ,  H04L27/06 ,  H03H7/36

CPC classification number: H04L25/03019 ,  H04L27/066

Abstract: A receiver includes means for sampling and noncoherently demodulating a received signal to provide digital symbols in each of a first and second channel. An equalization network equalizes the incoming signal and a phase correction network corrects the phase of the equalized signal. In response to the transmission of a preamble in the first channel, a fast learn network derives the phase error by determining the arc tangent of a quotient formed by dividing the signal in the first channel by the signal in the second channel. A course phase jump can be made to insure that the arc tangent is not greater than unity. The timing error of the sampling means can be derived by determining the arc tangent of a quotient formed by dividing the present digital symbol in the one channel by the preceding digital symbol in the one channel. In response to an impulse in the preamble, the lead-in samples of an impulse response can be stored while the phase error is computed from the major sample; then the phase of the lead-in samples can be corrected. Equalization coefficients can be derived from the phase corrected impulse response samples. With this apparatus, in accordance with the preferred method of the present invention, the receiver can be adapted to receive normal data in less than thirty milliseconds.

Abstract translation: 接收机包括用于对第一和第二信道中的每一个采样和非相干解调接收信号以提供数字符号的装置。 均衡网络均衡输入信号，相位校正网络校正均衡信号的相位。 响应于第一信道中的前导码的传输，快速学习网络通过确定通过将第一信道中的信号除以第二信道中的信号形成的商的反正切来导出相位误差。 可以进行课程阶段跳跃，以确保反正切不大于一致。 可以通过确定通过在一个通道中将当前数字符号除以一个通道中的前一数字符号而形成的商的反正切来导出采样装置的定时误差。 响应于前导码中的脉冲，可以存储脉冲响应的导入样本，同时从主要样本计算相位误差; 那么可以校正导入样品的相位。 均衡系数可以从相位校正的脉冲响应样本导出。 利用该装置，根据本发明的优选方法，接收机可以适应于在不到30毫秒内接收正常数据。