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91. 发明授权

US4263671A Sampling clock correction circuit 失效
标题翻译：采样时钟校正电路
公开(公告)号：US4263671A
公开(公告)日：1981-04-21
申请号：US952831
申请日：1978-10-19
申请人： Ran F. Chiu , Henry H. Parrish , Philip F. Kromer, III , Ming L. Kao
发明人： Ran F. Chiu , Henry H. Parrish , Philip F. Kromer, III , Ming L. Kao
IPC分类号： H04B3/04 , H04B3/06 , H04L7/00 , H04L7/02 , H03K5/159 , H04L25/08
CPC分类号： H04L7/0058 , H04L7/0062
摘要： A circuit for maintaining proper sampling timing in a data modem wherein main channel equalizer error is correlated with a derivative channel signal to drive a clock correction signal. The derivative channel signal is derived from an equalizer using fewer coefficients than required to derive the main channel equalized signal, and calculation of the equalized derivative and clock correction signal is performed only once every other Baud.
摘要翻译：一种用于在数据调制解调器中维持适当采样定时的电路，其中主信道均衡器误差与微分信道信号相关以驱动时钟校正信号。衍生通道信号从均衡器导出，使用比用于导出主信道均衡信号所需的系数更少的系数，并且均衡的微分和时钟校正信号的计算仅每隔一个波特进行一次。

92. 发明授权

US4243956A Automatic equalizer for a synchronous digital transmission signal 失效
标题翻译：自动均衡器用于同步数字传输信号
公开(公告)号：US4243956A
公开(公告)日：1981-01-06
申请号：US19245
申请日：1979-03-09
申请人： Michel Lemoussu , Claude Cardot
发明人： Michel Lemoussu , Claude Cardot
IPC分类号： H04B3/06 , H04L25/03 , H04B3/08
CPC分类号： H04L25/03019 , H04B3/06
摘要： The present invention comes within the field of synchronous digital transmission. It provides an automatic variable equalization network (1) equipped with phase-locking means, in which a sign coincidence autocorrelator (30) correlates the polarities of two versions of the equalized signal delayed in relation to each other by .tau., an integer multiple of the unit time interval of the transmission. It is used advantageously for equalizing synchronous digital transmission channels in switched telephone or telegraph networks.
摘要翻译：本发明属于同步数字传输领域。它提供了一种配备有相位锁定装置的自动可变均衡网络（1），其中符号自相关器（30）将相互延迟的两个版本的均衡信号的极性相关联，以tau为单位的整数倍传输单位时间间隔。它有利地用于均衡交换电话或电报网络中的同步数字传输信道。

93. 发明授权

US4160276A Aperture correction circuit 失效
标题翻译：孔径校正电路
公开(公告)号：US4160276A
公开(公告)日：1979-07-03
申请号：US846742
申请日：1977-10-31
申请人： Daniel G. Baker
发明人： Daniel G. Baker
IPC分类号： H03H7/01 , H04B3/06 , H04B3/40 , H04L25/03 , H04N5/208 , H04N5/14
CPC分类号： H04B3/40 , H04N5/208
摘要： The present invention relates generally to electrical signal transmission lines which are terminated in a manner enabling efficient use of signal energy transmitted through such lines while preventing signal reflections in such lines, and in particular is directed to a termination circuit for a lossy delay line which includes a pair of emitter coupled transistors having positive feedback to develop a negative impedance to terminate the lossy delay line to compensate for the loss in the lossy delay line.

94. 发明授权

US4152649A Channel equalization apparatus and method using the Fourier transform technique 失效
标题翻译：使用傅立叶变换技术的信道均衡装置和方法
公开(公告)号：US4152649A
公开(公告)日：1979-05-01
申请号：US808934
申请日：1977-06-21
申请人： Michel Choquet
发明人： Michel Choquet
IPC分类号： H03H15/00 , H03H19/00 , H04B3/06 , H04B3/10 , H04L25/03
CPC分类号： H04L25/03038
摘要： A method of and apparatus for determining during an initial training period the initial values of the coefficients of a transversal equalizer in a data transmission system in which the transmission channel creates frequency shift. The received periodic training sequence is modulated by a time-domain window signal whose Fourier transform exhibits a relatively flat central peak and has comparatively low values in the vicinity of those frequencies which are a multiple of the inverse of the period of the transmitted sequence, and the discrete Fourier transform W.sub.k of the modulated signal is computed. The values of the coefficients of the equalizer are obtained by computing the inverse discrete Fourier transform of the ratio F.sub.k =Z.sub.k /W.sub.k, where Z.sub.k is the discrete Fourier transform of the transmitted sequence.
摘要翻译：一种用于在初始训练周期期间确定传输信道产生频移的数据传输系统中的横向均衡器的系数的初始值的方法和装置。接收到的周期性训练序列由时域窗口信号调制，其傅里叶变换表现出相对平坦的中心峰值，并且在那些频率附近具有相对较低的值，这些频率是发送序列的周期的倒数倍，计算调制信号的离散付里叶变换Wk。通过计算比值Fk = Zk / Wk的离散傅里叶逆变换得到均衡器的系数值，其中Zk是发射序列的离散傅立叶变换。

95. 发明授权

US4131859A Method of compensation of intermodulation noise and devices for the implementing thereof 失效
标题翻译：互调噪声补偿方法及其实现方法
公开(公告)号：US4131859A
公开(公告)日：1978-12-26
申请号：US839170
申请日：1977-10-04
申请人： Pierre D. Valle
发明人： Pierre D. Valle
IPC分类号： H04B3/32 , H03F1/32 , H04B3/06 , H03F1/26 , H03F3/68
CPC分类号： H03F1/3241 , H03F1/3252 , H04B3/06
摘要： The present invention relates to amplifier chains such as are found, for example, in carrier analog transmission by cable with repeaters. Intermodulation noise is reduced by opposing an intermodulation noise generated by a compensation source from the signal available at the chain output to the intermodulation noise generated by the chain. It applies in particular to cable transmission links with repeaters to improve the signal-to-noise ratio thereof.
摘要翻译：本发明涉及放大器链，例如通过具有中继器的电缆进行载波模拟传输。通过将由补偿源产生的互调噪声从链输出处可用的信号与由链产生的互调噪声相反，来减少互调噪声。它特别适用于具有中继器的电缆传输链路，以提高其信噪比。

96. 发明授权

US4079202A Digital communication system 失效
标题翻译：数字通讯系统
公开(公告)号：US4079202A
公开(公告)日：1978-03-14
申请号：US731142
申请日：1976-10-12
申请人： Delmar Virgil Payne
发明人： Delmar Virgil Payne
IPC分类号： H03H7/01 , H04B3/06 , H04L25/497 , H04L27/00 , H04J3/18
CPC分类号： H04L27/00 , H04L25/497
摘要： A signal system for use in a communication system for reducing intersymbol interference to increase the data rate per cycle of bandwidth, comprising a plurality of digital channel signal states each representing a channel symbol having a plurality of bits, the channel signal states being related in accordance with the simultaneous solution of a number of equations which are the first derivatives of mean squared channel error with respect to each signal state, each equation being set equal to zero and the equations being solved simultaneously to provide the related signal states.
摘要翻译：一种在通信系统中用于减少码间干扰以增加每个带宽周期的数据速率的信号系统，包括多个数字信道状态，每个数字信道状态表示具有多个比特的信道符号，信道信号状态根据同时解决了相对于每个信号状态的平均通道误差的一阶导数的多个等式，每个方程被设置为等于零，并且等式被同时求解以提供相关的信号状态。

97. 发明授权

US4064397A Automatic equalizer having a coefficient matrix circuit 失效
标题翻译：具有系数矩阵电路的自动均衡器
公开(公告)号：US4064397A
公开(公告)日：1977-12-20
申请号：US699581
申请日：1976-06-24
申请人： Hiroshi Sakaki , Sotokichi Shintani , Hidemi Kuroda
发明人： Hiroshi Sakaki , Sotokichi Shintani , Hidemi Kuroda
IPC分类号： H03H15/00 , H04B3/06 , H04L25/03 , G06F15/34 , H04B3/04
CPC分类号： H04L25/03165 , H04L2025/03464
摘要： In an automatic equalizer for regenerating a received digital signal, comprising a delay element train with a plurality of taps, a coefficient matrix circuit and a group of variable coefficient units, the structure of said coefficient matrix circuit being considerably simplified by introducing a simple adder and/or subtractor at the input and/or the output of said coefficient matrix circuit.
摘要翻译：在用于再生接收数字信号的自动均衡器中，包括具有多个抽头的延迟元件串，系数矩阵电路和一组可变系数单元，所述系数矩阵电路的结构通过引入简单的加法器和 /或所述系数矩阵电路的输入和/或输出的减法器。

98. 发明授权

US4028628A Transceivers for single channel carrier telephone systems 失效
标题翻译：单通道电话系统的收发器
公开(公告)号：US4028628A
公开(公告)日：1977-06-07
申请号：US638152
申请日：1975-12-05
申请人： Tadikonda Narashimha Rao , Rouben Toumani
发明人： Tadikonda Narashimha Rao , Rouben Toumani
IPC分类号： H04M1/78 , H03G3/30 , H04B3/06 , H04B1/16
CPC分类号： H04B3/06 , H03G3/3057
摘要： A single channel carrier system is disclosed in which carrier techniques are used to add a second private talking path on a normal telephone subscriber loop. A central office unit modulates the second subscriber's signal to an inaudible range while the remote subscriber's unit demodulates this signal to recover the voice signal. The same process is used in the opposite direction utilizing a different carrier frequency.Each unit includes a carrier receiver having automatic gain control circuits and a variable attenuation circuit. The automatic gain control circuit includes a direct current clamp to minimize excursions of the AGC signal in the absence of a received carrier. The variable attenuation circuit uses a diode bridge shunting the signal path and controlled by the AGC signal. A linear carrier oscillator is implemented by providing a constant current source of oscillation energy.
摘要翻译：公开了一种单通道载波系统，其中使用载波技术来在普通电话用户环路上增加第二专用通话路径。中心局单元将第二用户的信号调制到听不见的范围，而远程用户的单元解调该信号以恢复语音信号。使用不同的载波频率在相反方向使用相同的过程。

99. 发明授权

US3943468A Amplitude equalizer using mixing for error detection 失效
标题翻译：振幅均衡器采用混合进行误差检测
公开(公告)号：US3943468A
公开(公告)日：1976-03-09
申请号：US518588
申请日：1974-10-29
申请人： Donald Clyde Cox , Douglas Otto John Reudink
发明人： Donald Clyde Cox , Douglas Otto John Reudink
IPC分类号： H04B3/06 , H04B3/14 , H04B1/10
CPC分类号： H04B3/144 , H04B3/06
摘要： Apparatus for accomplishing amplitude equalization between two input signals includes circuitry for generating the sum and the difference of the two signals, mixing the sum and the difference and applying the low-pass filtered version of the mixed resultant as a feedback error signal of very low frequency to an attenuator associated with one of the two input signals. A hybrid combiner may be used to generate the sum and the difference from the two input signals. The phases of the two input signals are unaffected by the amplitude equalization. A particular application of the invention is in a LIND (linear amplification using nonlinear devices) amplifier such as that disclosed in U.S. Pat. No. 3,777,275 issued Dec. 4, 1973 to D. C. Cox.
摘要翻译：用于实现两个输入信号之间的幅度均衡的装置包括用于产生和和两个信号的差的电路，混合和和差，并将混合结果的低通滤波版本作为非常低频的反馈误差信号耦合到与两个输入信号之一相关联的衰减器。可以使用混合组合器来产生和两个输入信号的和。两个输入信号的相位不受幅度均衡的影响。本发明的一个具体应用是在美国专利公开公开的LIND（线性放大使用非线性器件）放大器中。 1973年12月4日授予D.C.Cox的第3,777,275号。

100. 发明授权

US3935535A Fast equalization acquisition for automatic adaptive digital modem 失效
标题翻译：自动适应数字调制解调器的快速均衡采集
公开(公告)号：US3935535A
公开(公告)日：1976-01-27
申请号：US504440
申请日：1974-09-09
申请人： David M. Motley , King Y. Cheng
发明人： David M. Motley , King Y. Cheng
IPC分类号： H04M11/06 , H03H15/00 , H03H17/00 , H03H21/00 , H04B3/06 , H04L25/03 , H04M11/00 , H04B1/10
CPC分类号： H04L25/03133
摘要： A transmitter transmits data through a communication channel to a receiver and the communication channel provides the data with delay and attenuation distortion. The receiver includes an equalization network having taps with multiplying coefficients for correcting the delay and attenuation distortion of the data. In response to a special sequence of the data, either specially generated by the transmitter or detected in random data, the receiver generates signals for updating the multiplying coefficients of the taps and these signals are introduced to the equalization network through a gate enabled by a special sequence detection network. This apparatus provides for the adjustment of the equalization taps in an extremely short period of time such as 5.83 milliseconds.
摘要翻译：发射机通过通信信道向接收机发送数据，通信信道为数据提供延迟和衰减失真。接收机包括具有用于校正数据的延迟和衰减失真的乘法系数的抽头的均衡网络。响应于数据的特殊序列，由发射机专门产生或以随机数据检测，接收机产生用于更新抽头的乘法系数的信号，并且这些信号通过特殊功能的门被引入均衡网络序列检测网络。该装置在非常短的时间段（例如5.83毫秒）中提供均衡抽头的调整。

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