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51. 发明申请

WO1995008893A1 METHOD OF PREDICTING VOLTAGES IN TELEPHONE LINE MEASUREMENT 审中-公开
标题翻译：电话线测量中预测电压的方法
公开(公告)号：WO1995008893A1
公开(公告)日：1995-03-30
申请号：PCT/CA1994000399
申请日：1994-07-20
申请人： NORTHERN TELECOM LIMITED
发明人： NORTHERN TELECOM LIMITED , VOGT, John, Vincent, III , SUMMERS, Charles, Ernest
IPC分类号： H04M03/30
CPC分类号： H04M3/305 , G01R31/021 , H04M3/30
摘要： For measuring characteristics (resistance, capacitance, and foreign voltage) on a telephone line, source voltages are coupled via source resistances to the line in three test conditions and the parameters are calculated from steady state voltages at the terminals of the line. Each steady state voltage is predictively calculated from nine samples of the voltage at the terminal using a closed form second order solution of a circuit model of the telephone line derived from a transformation of the circuit module into the Z domain and using the matched pole-zero technique. The steady state voltages can thus be determined without waiting for transients, due to the time constants of the telephone line, to die out, resulting in much faster measurements for telephone lines with large time constants.
摘要翻译：为了测量电话线上的特性（电阻，电容和异常电压），在三个测试条件下，源电压通过源极电阻耦合到线路，并且参数由线路端子处的稳态电压计算。使用从电路模块的变换导出到Z域中的电话线的电路模型的闭合形式的二阶解，并使用匹配的极点零点来从终端的电压的九个采样中预测每个稳态电压技术。因此，由于电话线路的时间常数而不等待瞬变，可以确定稳态电压，从而导致具有大的时间常数的电话线的测量速度更快。

52. 发明申请

WO1994029947A1 LOW NOISE OSCILLATORS AND TRACKING FILTERS 审中-公开
标题翻译：低噪声振荡器和跟踪滤波器
公开(公告)号：WO1994029947A1
公开(公告)日：1994-12-22
申请号：PCT/CA1994000237
申请日：1994-05-04
申请人： NORTHERN TELECOM LIMITED
发明人： NORTHERN TELECOM LIMITED , BROWN, Anthony, Kevin, Dale
IPC分类号： H03B05/20
CPC分类号： H03H11/42 , H03B5/20 , H03G1/0023
摘要： A gyrator based resonator comprises first and second differential amplifiers cross coupled to form a quadrature phase voltage controlled oscillator. The differential amplifier circuits include matched transistor pairs and associated transconductance adjusting components to control the resonant frequency of the resonator. Transconductance delay and admittance loss elements are also provided and these elements serve to control the loop gain of the resonator. A loop gain greater than unity results in the resonator oscillating while a loop gain less than unity produces a bandpass filter. A resonator having gain less than unity may be slaved to a similar resonator having gain adjusted to be greater than unity thus creating a low noise oscillator and tracking filter.
摘要翻译：基于回转器的谐振器包括交叉耦合以形成正交相压控振荡器的第一和第二差分放大器。差分放大器电路包括匹配的晶体管对和相关联的跨导调整组件以控制谐振器的谐振频率。还提供了跨导延迟和导纳损耗元件，并且这些元件用于控制谐振器的环路增益。大于单位的环路增益导致谐振器振荡，而环路增益小于单位产生带通滤波器。具有小于1的增益的谐振器可以被从属于具有被调整为大于1的增益的类似谐振器，从而产生低噪声振荡器和跟踪滤波器。

53. 发明申请

WO1994024801A1 TELECOMMUNICATIONS SYSTEM 审中-公开
标题翻译：电信系统
公开(公告)号：WO1994024801A1
公开(公告)日：1994-10-27
申请号：PCT/GB1993000800
申请日：1993-04-15
申请人： NORTHERN TELECOM LIMITED , MAXWELL, Deborah, Claire , DAY, Brian, Ronald
发明人： NORTHERN TELECOM LIMITED
IPC分类号： H04M03/00
CPC分类号： H04Q3/622 , H04Q3/0016 , H04Q2213/13176 , H04Q2213/1322 , H04Q2213/13384
摘要： A telecommunications system comprises a public network and one or more private networks each comprising a plurality of private exchanges (PBX's) (14) coupled to the public network. Signal mapping from PBX to public format and inverse mapping from public to PBX format provides transparent signalling of PBX calls across the public network. This avoids the use of dedicated private lines from the private network.
摘要翻译：电信系统包括公共网络和一个或多个专用网络，每个专用网络包括耦合到公共网络的多个私人交换机（PBX）（14）。从PBX到公共格式的信号映射以及从公共到PBX格式的反向映射提供了通过公共网络的PBX呼叫的透明信令。这避免了使用专用网络中的专用专线。

54. 发明申请

WO1994017619A1 METHOD OF PROVIDING D.C. FEED TO A TELEPHONE LINE 审中-公开
标题翻译：提供直流电话线路的方法
公开(公告)号：WO1994017619A1
公开(公告)日：1994-08-04
申请号：PCT/CA1993000283
申请日：1993-06-30
申请人： NORTHERN TELECOM LIMITED
发明人： NORTHERN TELECOM LIMITED , GORES, Stanley, Adam , DARVEAU, Joseph, Francois, Michel , TREMBLAY, Francois, Yvon , ROSENBAUM, Stanley, Daniel , ROSCH, Reinhard, Werner
IPC分类号： H04M19/02
CPC分类号： H04M19/023
摘要： A two-wire telephone line is supplied with d.c. feed from a drive circuit (10) including two amplifiers (32) via which a transmission signal (Rx) is supplied to the line. Output potentials (TV, RV) of the two amplifiers determine a loop current (IL) on the line, which is monitored and used to control a supply voltage (CV) for the drive circuit, the amplifier output potentials being offset from the supply potentials by headroom voltages (TH, RH) to accommodate the transmission signal. The resulting current limiting voltage control acts iteratively to converge the supply voltage and a target voltage (TG) which is inversely dependent on an amount by which the loop current exceeds a predetermined value, the rate of convergence being fast for high loop currents for rapid response and slow for small differences to provide stable operation. The headroom voltages can be increased to nearly the supply voltage to reverse the polarity of the d.c. feed while maintaining current limiting.
摘要翻译：一根双线电话线与d.c. 从包括两个放大器（32）的驱动电路（10）馈送，通过该放大器将发送信号（Rx）提供给该线路。两个放大器的输出电位（TV，RV）决定了线路上的回路电流（IL），该电流被监视并用于控制驱动电路的电源电压（CV），放大器输出电位与电源电位相抵消通过净空电压（TH，RH）来适应传输信号。所得到的限流电压控制迭代地使电源电压和目标电压（TG）收敛，该目标电压（TG）与环路电流超过预定值的量成反比，对于快速响应的高回路电流，收敛速度快并且缓慢的小差异提供稳定的操作。净空电压可以提高到几乎电源电压，以反转直流电的极性。饲料，同时保持电流限制。

55. 发明申请

WO1994004007A2 TELECOMMUNICATIONS SWITCH ARCHITECTURE 审中-公开
标题翻译：电信交换架构
公开(公告)号：WO1994004007A2
公开(公告)日：1994-02-17
申请号：PCT/GB1993001584
申请日：1993-07-27
申请人： NORTHERN TELECOM LIMITED , CROSSLAND, William, Alden , SCARR, Robert, Walter , BIRCH, Martin, John , SPARKS, Adrian, Paul
发明人： NORTHERN TELECOM LIMITED
IPC分类号： H04Q11/00
CPC分类号： H04L12/5601 , H04J2203/0012 , H04J2203/0019 , H04L49/106 , H04L49/1553 , H04L49/1576 , H04L49/203 , H04L49/606 , H04L2012/5605 , H04L2012/5682 , H04Q11/0005 , H04Q11/0066 , H04Q11/0478 , H04Q2011/0011 , H04Q2011/0013 , H04Q2011/0022 , H04Q2011/0024 , H04Q2011/0039 , H04Q2011/0052
摘要： Telecommunications switch architectures and switching methods based on the principle of replication/broadcasting some or all of the incoming data from each input switch port to all output switch ports. The replicated data is transferred to the output ports either by the respective output port reading directly from a relevant address in an input memory, or by transferring the content of all or part of the input memory data simultaneously en bloc and in parallel to a plurality of output memories, with each output port then taking the data intended therefor. The input and output data is in serial form but transferred in parallel form. The data can be replicated optically (Fig. 8) or electronically (Fig. 12). In particular, the input data can be formatted as spatially arranged pages in the optical domain by spatial light modulators (SLM) and switched by an image replicating optical switch, such as a matrix-matrix switch, to an output plane at which a second SLM device converts the data back to serial form. The SLM's may be based on FELC/VLSI technology. A mixture of ATM and STM data can be switched in a single arrangement (Fig. 8).
摘要翻译：电信交换架构和切换方法基于复制/广播的原则，将每个输入交换机端口的一些或全部输入数据传输到所有输出交换机端口。复制数据通过相应的输出端口直接从输入存储器中的相关地址读取，或者通过同时整体地并行地传送全部或部分输入存储器数据的内容而被传送到输出端口输出存储器，每个输出端口接收用于此的数据。输入和输出数据是串行形式，但以并行形式传输。可以光学地（图8）或电子地复制数据（图12）。特别地，输入数据可以通过空间光调制器（SLM）在光域中被格式化为空间布置的页面，并且通过诸如矩阵矩阵开关的图像复制光开关切换到第二SLM的输出平面设备将数据转换回串行格式。 SLM可能基于FELC / VLSI技术。 ATM和STM数据的混合可以以单一方式进行切换（图8）。

56. 发明申请

WO1993019517A1 RESONANT CIRCUIT AND MULTIPLE RESONATOR CIRCUITS CONSTRUCTED THEREFROM 审中-公开
标题翻译：谐振电路和多个谐振器电路构成
公开(公告)号：WO1993019517A1
公开(公告)日：1993-09-30
申请号：PCT/CA1992000534
申请日：1992-12-09
申请人： NORTHERN TELECOM LIMITED
发明人： NORTHERN TELECOM LIMITED , BROWN, Anthony, Kevin, Dale
IPC分类号： H03B05/20
CPC分类号： H03B27/00
摘要： A resonant circuit comprises first (600) and second (600') amplifiers. An input of the second amplifier is coupled to an output of the first amplifier, and an output of the second amplifier is cross-coupled to an input of the first amplifier. The first amplifier has a first gain and a 90 degree phase shift between its input and its output at a resonant frequency of the resonant circuit. The second amplifier has a second gain and a 90 degree phase shift between its input and its output at the resonant frequency of the resonant circuit. The second gain is different from the first gain. The resonant circuit can have a first port (Ap, An) and second ports (Bp, Bn) coupled to an input and an output respectively of one of the first and second amplifiers. Because the gains of the first and second amplifiers differ, the gain from the first port to the second port of the resonant circuit will differ from the gain from the second port to the first port. This gain difference is useful for enhancing the quality factor Q of multiple resonator circuits constructed from such resonant circuits.

57. 发明申请

WO1993017377A1 REFERENCE VOLTAGE GENERATOR FOR DYNAMIC RANDOM ACCESS MEMORY 审中-公开
标题翻译：基准电压产生动态随机存取存储器
公开(公告)号：WO1993017377A1
公开(公告)日：1993-09-02
申请号：PCT/CA1992000493
申请日：1992-11-12
申请人： NORTHERN TELECOM LIMITED
发明人： NORTHERN TELECOM LIMITED , PHILLIPS, Richard, Stephen
IPC分类号： G05F03/24
CPC分类号： G05F3/247 , G11C5/147 , G11C11/4099
摘要： A reference voltage generator can provide RAMs (random access memories) with a reference voltage (generally mid-way between a supply voltage and a common potential), with improved follower characteristics. When the supply voltage and/or the load condition of the RAMs are significantly altered, the reference voltage is rapidly adjusted by dynamic switching FETs, being pulled down or up. Under balanced conditions when essentially no current flows in the switching FETs, overall power consumption is low.

58. 发明申请

WO1992019062A1 CURRENT LIMITED CIRCUIT FOR SUBSCRIBER INTERFACE 审中-公开
标题翻译：用于订户界面的电流有限公司
公开(公告)号：WO1992019062A1
公开(公告)日：1992-10-29
申请号：PCT/CA1992000154
申请日：1992-04-14
申请人： NORTHERN TELECOM LIMITED
发明人： NORTHERN TELECOM LIMITED , JAKAB, Gyula
IPC分类号： H04M01/76
CPC分类号： H04M19/001
摘要： A telephone subscriber loop interface circuit ensures that the loop current, even when a short length of cable is used, does not exceed about 50mA. A transformer (5) has a winding connected to the telephone line (2) and a split winding (6) connected to TIP and RING sides of the subscriber loop in the conventional manner. One half (6a) of the split winding is, as is conventional, connected to ground through a first resistor (8) but the second half of the split winding is connected through a second resistor (11) and a current limit circuit to a negative battery terminal. The current limit circuit is formed of a low ON resistance power MOS FET (12) and a control circuit which has a current sensing resistor (13) in series with the MOS FET (12). When no loop current is flowing the total resistance of the second resistor (11), current sensing resistor (13) and source to drain resistance of the MOS FET (12) equals the resistance of the first resistor. However, when loop current flows, the control circuit controls the gate of the MOS FET (12) thereby increasing the source to drain resistance and maintaining the current no greater than a predetermined value.
摘要翻译：电话用户环路接口电路确保环路电流即使使用短路电缆也不超过约50mA。变压器（5）具有连接到电话线（2）的绕组和以常规方式连接到用户环路的TIP和RING侧的分离绕组（6）。分裂绕组的一半（6a）如常规那样通过第一电阻器（8）连接到地，但是分离绕组的第二半部分通过第二电阻器（11）和限流电路连接到负极电池端子电流限制电路由具有与MOS FET（12）串联的电流检测电阻（13）的低导通电阻MOS FET（12）和控制电路构成。当没有回路电流流过第二电阻器（11）的总电阻时，电流检测电阻器（13）和MOS FET（12）的源极到漏极电阻等于第一电阻器的电阻。然而，当环路电流流动时，控制电路控制MOS FET（12）的栅极，从而增加源极到漏极电阻并保持电流不大于预定值。

59. 发明申请

WO1992010044A1 CLOCK PHASE ALIGNMENT 审中-公开
标题翻译：时钟相位对准
公开(公告)号：WO1992010044A1
公开(公告)日：1992-06-11
申请号：PCT/CA1991000406
申请日：1991-11-13
申请人： NORTHERN TELECOM LIMITED
发明人： NORTHERN TELECOM LIMITED , WIGHT, Mark, Stephen , VAN ALSTINE, Valerie, Anne , HARRIS, Gwendolyn, Kate
IPC分类号： H04L07/02
CPC分类号： H04L7/033 , H04L7/0337
摘要： A phase error integrator (11) for determining the phase error between a data signal and a clock signal frequency locked to the data signal has a data input and a clock input. In one embodiment the phase error integrator (11) is formed as two functional components, namely a phase error detector (20) and an integrator chain (21). The phase error detector (20) sends to the integrator (21) one of two output signals (NAR, NAL) depending on whether the phase error is positive or negative. The integrator chain has a number of outputs (ERR0-ERR13) the first half of which initially have a binary 1 and the second half of which initially have a binary 0. Depending on which output signal arrives from the phase error detector the binary 1's shift right or the binary 0's shift left. The integrator may be combined with a delay block (15) connected to the outputs of the integrator chain (21). The data signal is fed to the delay block (15) and a delayed data output signal is obtained which is connected to the data input of the phase error integrator (11). The delay block (15) delays the data signal until there is concordance between the phase of the clock and delayed data signals.

60. 发明申请

WO1992004710A1 CO-ORDINATE ADDRESSING OF LIQUID CRYSTAL CELLS 审中-公开
标题翻译：液晶细胞的共定位寻址
公开(公告)号：WO1992004710A1
公开(公告)日：1992-03-19
申请号：PCT/GB1991001537
申请日：1991-09-10
申请人： NORTHERN TELECOM LIMITED , CROSSLAND, William, Alden , BIRCH, Martin, John
发明人： NORTHERN TELECOM LIMITED
IPC分类号： G09G03/36
CPC分类号： G09G3/3688 , G09G3/3651 , G09G3/3677 , G09G2300/0809 , G09G2310/0251
摘要： A co-ordinate addressed bistable liquid crystal cell is switchable between its two stable states by oppositely directed electric potential differences applied across the liquid crystal layer thickness between a front-plane electrode and the members of a co-ordinate address array of electrode pads of an active back-plane. Refresh data is compared with currently displayed data so that only those pixels scheduled for switching are subjected to switching stimuli. The electrode pad of a pixel scheduled for switching is taken from a potential of the front-plane electrode to a different potential by connection to a voltage source. It is then electrically isolated from that voltage source for a further period before its potential is restored to that of the front-plane electrode. This enables rows of pixels to be addressed with a line address time considerably shorter than the time necessary to effect full switching.
摘要翻译：坐标寻址双稳态液晶元件通过施加到前平面电极和晶格元件之间的液晶层厚度的反向电位差可在其两个稳定状态之间切换。协调有效背景平面的电极块的寻址。将再生数据与正在显示的数据进行比较，使得只有要切换的像素受到切换激励。电极块通过一个像素通过连接到电压源从前平面电极的电势切换到不同的电势。然后在其电位降至正面电极电位之前，再与该电压源隔离一段时间。这使得可以处理一行中的像素行，寻址时间比执行完整开关所需的时间短得多。

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