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公开(公告)号：US4928287A
公开(公告)日：1990-05-22
申请号：US318001
申请日：1989-03-02
申请人： Masato Tanaka
发明人： Masato Tanaka
CPC分类号： G11B20/10037 , G11B20/10009 , G11B20/10046 , G11B5/035 , H03G5/165
摘要： An automatic adaptive equalizer inspects either the input or output signal to the equalizer and extracts a predetermined specific waveform from such signal, analyses the extracted specific waveform based upon predetermined inspection parameters, and then controls the characteristics of the equalizer based upon the results of the analysis, thereby optimizing the equalizer characteristics.
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公开(公告)号：US4920510A
公开(公告)日：1990-04-24
申请号：US63258
申请日：1987-06-17
CPC分类号： H03H17/02
摘要： The sampled-data band-pass filter device is based on the phenomemon of aliasing, and allows the substantially unattenuated passage of the components of an input signal at a frequency included within an interval comprised between a first frequency (f.sub.sL) and a second frequency (f.sub.sH), arranged around a third frequency (f.sub.sO), while it substantially attenuates the components of the input signal at frequencies outside said interval, and furthermore automatically performs the shift to low-frequency, around a fourth frequency (f.sub.O), of the components of the input signal which have passed without attenuation. According to the invention, the device comprises, as filter element, a sampled-data band-pass filter which employs, as sampling frequency, a fifth frequency (f.sub.s) equal to a whole submultiple of a sixth frequency (nf.sub.s) equal to the sum of the third frequency (f.sub.sO) and the fourth frequency (f.sub.O), having, as lower and upper cutoff frequencies, respectively the difference between the sixth frequency and the second frequency (nf.sub.s -f.sub.sH) and the difference between the sixth frequency and the first frequency (nf.sub.s -f.sub.sL).
摘要翻译： 采样数据带通滤波器装置基于混叠的特征，并且允许以包括在第一频率（fsL）和第二频率（fsL）之间的间隔内的频率的输入信号的分量的基本上未衰减的通过 fsH），其大致在第三频率（fs0）周围的频率衰减输入信号的分量，并且还自动地执行向组件的第四频率（f0）附近的低频移位 通过没有衰减的输入信号。 根据本发明，该装置包括作为滤波器元件的采样数据带通滤波器，采样数据带通滤波器采用等于等于总和的第六频率（nfs）的整数倍的第五频率（fs）作为采样频率 具有分别为第六频率和第二频率（nfs-fsH）之间的差和第六频率与第一频率之间的差的第三频率（fs0）和第四频率（f0）分别为下限和上限截止频率 频率（nfs-fsL）。
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公开(公告)号：US4918401A
公开(公告)日：1990-04-17
申请号：US889063
申请日：1986-07-24
申请人： Erik Langer
发明人： Erik Langer
CPC分类号： H03H15/00 , H03F3/607 , H03G1/0029 , H03G1/0088
摘要： The requirements of extreme miniaturization, remote operation, wide bandwidth, good reproducibility in high quantities, low cost and low insertion loss are met with an incrementally adjustable distributed network arrangement in the general configuration of a distributed amplifier. The arrangement comprises delay elements (Z.sub.Dm, Z.sub.Gm) and a plurality of controlled sources (T.sub.n-2, T.sub.n-1, T.sub.ni VCCS), a signal input (E) and a signal output (A). The controlled sources (T.sub.n-2, T.sub.n-1, T.sub.ni VCCS) may be selectively turned on and off. Dual gate FETs (T.sub.1, . . . T.sub.n) are employed as controlled sources, whose first gate (G.sub.1) is connected to the input signal voltage through delay elements (Z.sub.Gm) and whose second gate (G.sub.2) is maintained at suitable dc voltages for turning the respective FETs on and off.
摘要翻译： 通过在分布式放大器的一般配置中的增量可调的分布式网络布置来满足极端小型化，远程操作，宽带宽，大量重复性，低成本和低插入损耗的要求。 该装置包括延迟元件（ZDm，ZGm）和多个受控源（Tn-2，Tn-1，Tni VCCS），信号输入（E）和信号输出（A）。 受控源（Tn-2，Tn-1，Tni VCCS）可以选择性地打开和关闭。 采用双栅极FET（T1 ... Tn）作为受控源，其第一栅极（G1）通过延迟元件（ZGm）连接到输入信号电压，其第二栅极（G2）保持在合适的直流电压 打开和关闭相应的FET。
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公开(公告)号：US4847864A
公开(公告)日：1989-07-11
申请号：US209801
申请日：1988-06-22
申请人： Robert L. Cupo
发明人： Robert L. Cupo
CPC分类号： H04L27/01
摘要： A voice-band data symbol is typically impaired by so-called phase jitter prior to symbol being received at a data modem. Modem circuitry estimates the phase angle of the jitter and an infinite-impulse-response (IIR) filter adjusts to that phase angle so that the jitter can be corrected for by a demodulator circuit. Advantageously, the IIR filter is arranged so that its pair of complex, conjugate poles are initially positioned at a first predetermined radius within a unit circle. The angular displacement of the poles around the unit circle is adaptively increased in response to receipt of a series of such estimates until such displacement substantially equals the phase angle of the jitter. The poles are then positioned at a second predetermined radius to increase the gain of the filter.
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公开(公告)号：US4797898A
公开(公告)日：1989-01-10
申请号：US933654
申请日：1986-11-21
申请人： Aldo A. Martinez
发明人： Aldo A. Martinez
CPC分类号： H04B3/141
摘要： A data communication system, comprising a first and a second transceiver coupled together through a transmission channel, the transmission channel having transmission characteristics. A measurement circuit is coupled to the first transceiver for measuring the effects of the transmission characteristics upon a known signal transmitted from the second transceiver to the first transceiver a mapping of the transmission characteristics to a code is made and the code is transmitted from the first transceiver to the second transceiver. A plurality of predetermined filters for use in filtering signals to be transmitted by the second transceiver is selected upon receipt of the transmitted code.
摘要翻译： 一种数据通信系统，包括通过传输信道耦合在一起的第一和第二收发机，该传输信道具有传输特性。 测量电路耦合到第一收发器，用于测量传输特性对从第二收发器传输到第一收发器的已知信号的影响，传输特性与代码的映射被做出，并且代码从第一收发器 到第二个收发器。 在接收到所发送的代码时，选择用于过滤由第二收发器发送的信号的多个预定滤波器。
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公开(公告)号：US4786884A
公开(公告)日：1988-11-22
申请号：US28631
申请日：1987-03-20
申请人： Kornelis J. Wouda , Simon J. M. Tol
发明人： Kornelis J. Wouda , Simon J. M. Tol
CPC分类号： H04B3/23 , H03H21/0012 , H04L25/03038 , H04B3/238
摘要： Adaptive transversal filter for use with three-signal level signals, arranged to cancel shifts in the two extreme signal levels relative to the central signal level, information signaling whether the signal level is the central signal level being coupled to first delay means (2) having N+1 connecting terminals, and information signaling whether the signal level is either one or the other extreme signal level being coupled to second delay means (4) having N+1 connecting terminals and comprising first and second coefficient registers (C.sub.OO -C.sub.ON ; C.sub.O -C.sub.sN) each containing N+1 coefficients; means (8, 9) for always multiplying one of the coefficients by an associated connecting terminal signal of the delay means, means (10) for adding together all the multiplying results obtained for providing a cancellation signal and means for always blocking the signal from a connecting terminal of the second delay means when this signal represents neither the one nor the other extreme signal level.
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57.发明授权
公开(公告)号：US4748578A
公开(公告)日：1988-05-31
申请号：US674633
申请日：1984-11-26
申请人： Roger Lagadec , Henry O. Kunz
发明人： Roger Lagadec , Henry O. Kunz
CPC分类号： H03H17/0628
摘要： An input sampling sequence with an input sampling rate is translated into an output sampling sequence with a selectable output sampling rate in a sampling filter. A circuit for forming the time difference of the sampling points forms from the given input sampling rate and the desired output sampling rate a signal corresponding to the time difference and this is used in a translation circuit for converting into data for characterizing the filter coefficients. The sampling filter is conditioned by the selected coefficients from the translation circuit. The invention is suitable for the transmission of sampled data, particularly sampled rates between two systems operating at different clock frequencies.
摘要翻译： 具有输入采样率的输入采样序列被转换成采样滤波器中具有可选输出采样率的输出采样序列。 用于形成采样点的时间差的电路根据给定的输入采样率和期望的输出采样率形成与时间差相对应的信号，并且将其用于转换为用于表征滤波器系数的数据的转换电路中。 采样滤波器由来自平移电路的选定系数调节。 本发明适用于采样数据的传输，特别是在不同时钟频率下工作的两个系统之间的采样率。
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58.发明授权Low distortion filters for separating frequency or phase modulated signals from composite signals 失效用于从复合信号中分离频率或相位调制信号的低失真滤波器
公开(公告)号：US4747140A
公开(公告)日：1988-05-24
申请号：US946042
申请日：1986-12-24
申请人： John J. Gibson
发明人： John J. Gibson
CPC分类号： H03H15/00 , H04B1/1646
摘要： A circuit for separating FM signals from a composite signal utilizes a comb filter having successive frequency response nulls which span the frequency spectrum of the FM signal to be separated. The comb filter response is phase linear and defines the pass-band of the desired signal. A nonideal or phase nonlinear bandpass filter can be cascaded with the comb filter to attenuate out of band signals. The cascade combination of the comb filter and nonlinear bandpass filters is a cost effective substitute for the conventional, complicated phase linear bandpass filter having a boxcar frequency response traditionally used to separate FM signals.
摘要翻译： 用于从复合信号分离FM信号的电路利用具有连续频率响应零点的梳状滤波器，该频率响应零点跨越要分离的FM信号的频谱。 梳状滤波器响应是相位线性的并且定义所需信号的通带。 非线性或相位非线性带通滤波器可以与梳状滤波器级联以衰减带外信号。 梳状滤波器和非线性带通滤波器的级联组合是传统上用于分离FM信号的传统的复杂相位线性带通滤波器的成本有效的替代品，其具有箱式电车频率响应。
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公开(公告)号：US4747068A
公开(公告)日：1988-05-24
申请号：US918171
申请日：1986-10-10
CPC分类号： H03H21/0012
摘要： In an adaptive filter a plurality of outputs (5, 7, 9, 11) of a delay circuit (3) are coupled via coefficient control circuits (21, 23, 25, 27) to a plurality of inputs (91, 93, 95, 97) of an adder circuit (89). The control signal inputs (29, 31, 33, 35) of the coefficient control circuits each receive a control signal via first integrators (37, 39, 41, 43) from first multiplier circuits (53, 55, 57, 59). A further output (85) of the delay circuit (3) controls a further input (87) of the adder circuit (89). The output signal from the adder circuit is controlled by a control circuit (121) which receives a control signal from a second multiplier circuit (103) via a second integrator (109) and a circuit having an exponential transfer function (113). A convergence behavior of the adaptive filter which is virtually independent of signal amplitudes is obtained by driving the integrators in such a way that the amplitude of their input signals are substantially independent of the amplitude of the signal at the input (1) of the filter (FIG. 1).
摘要翻译： 在自适应滤波器中，延迟电路（3）的多个输出（5,7,9,11）经由系数控制电路（21,23,25,27）耦合到多个输入（91,93,95 ，97）加法器电路（89）。 系数控制电路的控制信号输入端（29,31,33,35）各自经由来自第一乘法电路（53,55,57,59）的第一积分器（37,39,41,43）接收控制信号。 延迟电路（3）的另外的输出（85）控制加法器电路（89）的另一个输入（87）。 来自加法器电路的输出信号由控制电路（121）控制，该控制电路经由第二积分器（109）和具有指数传递函数（113）的电路接收来自第二乘法器电路（103）的控制信号。 实际上与信号幅度无关的自适应滤波器的会聚行为是通过以这样一种方式驱动积分器来获得的，即它们的输入信号的幅度基本上与滤波器输入端（1）处的信号幅度无关（ 图。1）。
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60.发明授权Method and apparatus for minimizing errors in the digital processing of electrical signals 失效用于最小化电信号数字处理中的误差的方法和装置
公开(公告)号：US4709395A
公开(公告)日：1987-11-24
申请号：US631772
申请日：1984-07-17
申请人： Gerhard Fischer , Karl R. Scheuter
发明人： Gerhard Fischer , Karl R. Scheuter
CPC分类号： H04N1/4052 , H04N1/4057
摘要： A method and apparatus for minimizing errors in digital processing of electrical signals whereby a digital input signal is divided into a digital useful signal having a lower resolution than the input signal and into a digital error signal having lower resolution than the input signal. A deviation of the useful signal is reproduced from the input signal and a check is performed to see whether the sum error of a plurality of successive useful signal values crosses a prescribed upper or lower threshold. When a threshold is crossed, an error value of the useful signal which comes closest to this threshold is identified and the useful signal and the error signal of this signal value are corrected such that the sum error no longer crosses the threshold.
摘要翻译： 一种用于最小化电信号的数字处理中的误差的方法和装置，由此数字输入信号被分成具有比输入信号更低的分辨率的数字有用信号和具有比输入信号更低的分辨率的数字误差信号。 从输入信号再现有用信号的偏差，并执行检查以查看多个连续有用信号值的和误差是否超过规定的上限或下限阈值。 当超过阈值时，识别最接近该阈值的有用信号的误差值，并校正该信号值的有用信号和误差信号，使得和误差不再超过阈值。
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