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公开(公告)号：US06625278B1
公开(公告)日：2003-09-23
申请号：US09379603
申请日：1999-08-24
IPC分类号： H04M100
CPC分类号： H04M11/062 , H04M1/76
摘要： An AC impedance matching architecture which provides programmable AC impedance matching in a given range using a digital filter to filter a signal fed back from the impedance matched line to generate an AC impedance emulation control signal. The AC impedance emulation control signal is combined with a transmit signal (if desired) and drives a voltage controlled current source, which is in parallel with a reference impedance. A voltage is developed across the reference impedance to drive, e.g., the telephone line. The reference impedance is chosen based on a desired maximum AC impedance. The gain of the digital filter, a first order sigma delta filter in the disclosed embodiment, is chosen based on the desired value of the AC impedance. The transfer function of the digital filter is derived based on a desired AC impedance.
摘要翻译： AC阻抗匹配架构，其使用数字滤波器在给定范围内提供可编程AC阻抗匹配，以对从阻抗匹配线反馈的信号进行滤波，以产生AC阻抗仿真控制信号。 交流阻抗仿真控制信号与发射信号（如果需要）组合，并驱动与参考阻抗并联的压控电流源。 在参考阻抗上产生电压以驱动例如电话线。 基于所需的最大AC阻抗来选择参考阻抗。 在所公开的实施例中，数字滤波器，第一级Σ-Δ滤波器的增益是基于AC阻抗的期望值来选择的。 基于所需的AC阻抗导出数字滤波器的传递函数。
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2.发明授权Placement of a transmit predistortion filter with respect to a data access arrangement 失效发送预失真滤波器相对于数据存取装置的放置公开(公告)号：US06674856B1
公开(公告)日：2004-01-06
申请号：US09401995
申请日：1999-09-23
IPC分类号： H04M100
CPC分类号： H04M1/68
摘要： The present invention provides a digital pre-distortion filter in arrangement with a data access arrangement (DAA) on the component side (e.g., in a modem chipset). This arrangement of the pre-distortion filter outside of the DAA allows digital processes such as digital emulation of the central office impedance to remain unaffected by the pre-distortion in the transmitted signal, allowing the dynamic range of the transmitted signal to be flattened to minimize return loss without complicating the transfer function of the digital emulation of the central office complex load. In the case of a digital emulation filter, placement of a digital pre-distortion filter outside of an analog-to-digital (A/D) digital-to-analog (D/A) loop also minimizes the noise otherwise associated with the use of a pre-distortion filter. Thus, benefits of a pre-distortion filter can be gained without interfering with emulation of impedance, and without causing a significant amount of noise in the transmitted signal.
摘要翻译： 本发明提供了一种数字预失真滤波器，其配置为在组件侧（例如，调制解调器芯片组）中的数据访问装置（DAA）。 DAA之前的预失真滤波器的这种布置允许诸如中心局阻抗的数字仿真的数字处理不受传输信号中的预失真的影响，允许传输信号的动态范围被平坦化以最小化 返回损耗，而不会使中心局复杂负载的数字仿真传输功能复杂化。 在数字仿真滤波器的情况下，数字预失真滤波器在模数（A / D）数模（D / A）环路之外的放置也使得与使用相关的噪声最小化 的预失真滤波器。 因此，可以获得预失真滤波器的优点而不干扰阻抗的仿真，并且不会在发射信号中引起大量的噪声。
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公开(公告)号：US06823019B1
公开(公告)日：2004-11-23
申请号：US09363005
申请日：1999-07-30
IPC分类号： H04B1406
CPC分类号： H03H17/04
摘要： DC transients are removed from a digital filter such as a sigma delta filter (in particular from a sigma delta high pass filter) from the outset by presetting an input summing node to a sigma delta modulator. While the input summing node may be preset using any appropriate input, in a disclosed embodiment, a sigma delta high pass filter is preset by switching a partial feedback term between an input containing the non-zero preset value and the normal input comprising the output from the input summing node. The preset value is chosen based on the value of the zero of the transfer function of the sigma delta high pass filter, e.g., with the complement of the gain factor.
摘要翻译： 通过将输入求和节点预设到Σ-Δ调制器，从一开始就从数字滤波器例如Σ-Δ滤波器（特别是从Σ-Δ高通滤波器）中去除DC瞬变。 虽然可以使用任何适当的输入来预设输入求和节点，但是在所公开的实施例中，通过在包含非零预设值的输入和包括输出的正常输入之间切换部分反馈项来预设Σ-Δ高通滤波器 输入求和节点。 基于Σ-Δ高通滤波器的传递函数的零值的值例如以增益因子的补数来选择预设值。
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公开(公告)号：US06466650B1
公开(公告)日：2002-10-15
申请号：US09592863
申请日：2000-06-13
IPC分类号： H04M124
摘要： Telephone line service type identification is provided to a telephone technician in the field by the placement of one or more tuned circuit(s) across the telephone line. In one embodiment, an inexpensive tuned circuit such as a ceramic resonator forms a telecom service resonator ID device which is placed across a telephone line, either at the central office or at the customer premises. Injection of a test current at a predetermined frequency, and a suitable amplitude of the same indicates to the technician aspects of telecom service to that particular telephone line (e.g., the existence of POTS, ISDN, and/or xDSL) and or use of the telephone line by a home network such as HPNA. In another embodiment, a telecom service transponder ID device is formed to provide line service identification to an interrogating line technician. The telecom service transponder ID device is activated when the test signal including an appropriate frequency is present to cause excitation in the telecom service transponder ID device. The resonator and transponder devices preferably have very high impedances at all frequencies except at the desired resonant frequency, and thus avoids violation of telephone service standards. The resonator or transponder ID devices may be placed anywhere along the telephone line, but preferably at the customer premises, or in installed equipment utilizing the telephone line. More than one resonation frequency may be implemented with parallel tuned circuits to indicate additional features of service on the telephone line (e.g., the number of services, the existence of a data service, etc.). The frequencies of resonance of the tuned circuits are preferably chosen to exist between the spectrum utilized by the various operating services.
摘要翻译： 通过在电话线路上放置一个或多个调谐电路，在现场向电话技术人员提供电话线服务类型识别。 在一个实施例中，诸如陶瓷谐振器的便宜的调谐电路形成电信服务谐振器ID设备，其被布置在电话线路上，无论是在中心局还是在客户驻地处。 以预定频率注入测试电流，并且其适当的幅度指示给该特定电话线的电信服务的技术人员方面（例如，POTS，ISDN和/或xDSL的存在）和/或使用 电话线由家庭网络如HPNA。 在另一个实施例中，形成电信服务转发器ID设备以向询问线技术人员提供线路服务识别。 当存在包括适当频率的测试信号以引起电信业务转发器ID设备中的激励时，电信业务应答器ID设备被激活。 除了在期望的谐振频率之外，谐振器和应答器装置优选地在所有频率处具有非常高的阻抗，并且因此避免违反电话服务标准。 谐振器或应答器ID设备可以放置在电话线的任何地方，但优选地位于客户住宅处，或者在使用电话线路的安装设备中。 可以使用并行调谐电路来实现多于一个谐振频率以指示电话线上的服务的附加特征（例如，服务的数量，数据服务的存在等）。 调谐电路的谐振频率优选地被选择为存在于由各种操作服务使用的频谱之间。
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公开(公告)号：US07912210B2
公开(公告)日：2011-03-22
申请号：US12187456
申请日：2008-08-07
IPC分类号： H04M1/00
CPC分类号： H04L25/0266 , H04M11/06
摘要： A system for improving the attenuation of an undesired signal found in a differential signal path through the use of inductive coupling. The system includes a primary inductor, a secondary inductor, and a filter. The primary inductor and the secondary inductor operably couple an input differential signal pair to an output differential signal pair, and the filter attenuates an undesired signal in the output differential signal pair.
摘要翻译： 一种用于通过使用电感耦合来改善在差分信号路径中发现的不期望信号的衰减的系统。 该系统包括初级电感器，次级电感器和滤波器。 主电感器和次级电感器将输入差分信号对可操作地耦合到输出差分信号对，并且滤波器衰减输出差分信号对中的不期望信号。
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公开(公告)号：US06674857B1
公开(公告)日：2004-01-06
申请号：US09414568
申请日：1999-10-08
申请人： Jonathan H. Fischer , Donald R. Laturell , Lane A. Smith , Michael S. Toth , Keith E. Hollenbach , Weilin Zhu
发明人： Jonathan H. Fischer , Donald R. Laturell , Lane A. Smith , Michael S. Toth , Keith E. Hollenbach , Weilin Zhu
IPC分类号： H04M100
CPC分类号： H04M19/005 , Y02D70/1222
摘要： A line powered data access arrangement (DAA) is disclosed which adaptively allows proper operation with power supplied from a telephone line as conditions warrant, while at the same time satisfying the relevant requirements of many countries. In the line powered codec, a startup procedure for the international line powered codec uses register settings, e.g., country-specific register settings, which are powered and maintained from the low voltage side (e.g., from the PC or modem side) of the line powered codec. In this way, even during low line power conditions the programmed state of the line powered codec can be maintained, thus a default condition will not necessarily returned to by the line powered codec upon reset due to a power loss in the telephone line. In another aspect, a charge storage device such as a charge capacitor is charged from a charge pump formed from a differential clock signal from the low voltage side. A current and voltage detection module in the line powered codec is always powered from the telephone line. Upon detection of an off-hook signal or a power down condition, the current detection module determines if/when the current and voltage on the telephone line is sufficient to power certain circuits on the line powered codec. If sufficient power is not present, the line powered codec does not power up. However, the line powered codec will power up if sufficient current is detected. In another aspect, a plurality of power rails may be provided. A first power rail may be associated with the line power, a second power rail may be associated with a low voltage side power source, e.g., a charge storage device. A third (and other) power rails may be switchably connected to either the first power rail or second power rail as line power conditions and on-hook/off-hook conditions warrant.
摘要翻译： 公开了一种线路数据访问安排（DAA），其适应性地允许根据条件允许从电话线路提供的电力进行适当的操作，同时满足许多国家的相关要求。 在线路供电的编解码器中，用于国际线路供电的编解码器的启动过程使用寄存器设置，例如，国家特定寄存器设置，其由线路的低电压侧（例如，从PC或调制解调器侧）供电和维护 电源编解码器。 以这种方式，即使在低功率电力条件下，也可以维护线路供电的编解码器的编程状态，因此由于电话线路中的功率损耗，默认条件不一定由线路供电的编解码器复位。 另一方面，诸如充电电容器的电荷存储装置从由低电压侧的差分时钟信号形成的电荷泵充电。 线路供电编解码器中的电流和电压检测模块始终通过电话线供电。 当检测到摘机信号或断电状态时，电流检测模块确定电话线路上的电流和电压是否足以对线路供电的编解码器上的某些电路供电。 如果没有足够的电源，线路供电的编解码器不会上电。 然而，如果检测到足够的电流，则线路供电的编解码器将上电。 另一方面，可以设置多个电源轨。 第一电力轨可以与线路电力相关联，第二电力轨道可以与低电压侧电源（例如电荷存储装置）相关联。 第三（和其他）电源轨可以切换地连接到第一个电源轨或第二个电源轨，因为线路电源条件和挂机/摘机条件值得。
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7.发明授权公开(公告)号：US07113587B1
公开(公告)日：2006-09-26
申请号：US09605953
申请日：2000-06-28
IPC分类号： H04M3/22
CPC分类号： H04M3/2272 , H04M3/14
摘要： The invention provides a low cost, simple, circuit for detecting the condition of a telephone line.
摘要翻译： 本发明提供了一种用于检测电话线条件的低成本，简单的电路。
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公开(公告)号：US06687371B1
公开(公告)日：2004-02-03
申请号：US09414567
申请日：1999-10-08
申请人： Jonathan H. Fischer , Donald R. Laturell , Lane A. Smith , Michael S. Toth , Michael G. Williams
发明人： Jonathan H. Fischer , Donald R. Laturell , Lane A. Smith , Michael S. Toth , Michael G. Williams
IPC分类号： H04M100
CPC分类号： H04M19/001 , Y02D70/1222
摘要： A line powered codec which adaptively allows operation with power supplied from a telephone line in many countries as conditions warrant. A startup procedure uses country-specific register settings, which are powered and maintained from a low voltage side other than the telephone line. Thus, during low line power conditions a programmed state of the line powered codec can be maintained even after a power loss in the telephone line. In another aspect, a current and voltage detection module in the line powered codec is always powered from the telephone line. If sufficient power is not present, the line powered codec does not power up. In yet another aspect, a plurality of power rails may be provided.
摘要翻译： 线路供电的编解码器，根据条件，自动允许在许多国家的电话线路提供的电力进行操作。 启动程序使用特定于国家的寄存器设置，它们由电话线以外的低压侧供电和维护。 因此，在低功率电力条件下，甚至在电话线路中的电力损失之后也可以维持线路供电的编解码器的编程状态。 在另一方面，线路供电的编解码器中的电流和电压检测模块总是由电话线供电。 如果没有足够的电源，线路供电的编解码器不会上电。 在另一方面，可以提供多个电源轨。
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9.发明授权公开(公告)号：US08437467B2
公开(公告)日：2013-05-07
申请号：US13187683
申请日：2011-07-21
CPC分类号： H04M3/2272 , H04M3/14
摘要： In one embodiment, a low cost, simple circuit for detecting an off-hook condition of a telecommunication line comprising tip and ring signal lines is provided. The circuit comprises a voltage divider for coupling between the tip and ring lines without an intervening transistor and having a node at which is presented a scaled version of a voltage across the voltage divider. The circuit further comprises a transistor having a control terminal coupled to the node, a first current flow terminal coupled to a voltage source, and a second current flow terminal coupled to an output terminal, wherein the output terminal bears a value that is indicative of a voltage across the tip and ring lines and thus whether the telecommunication line is off-hook.
摘要翻译： 在一个实施例中，提供了用于检测包括尖端和环形信号线的电信线路的摘机状态的低成本，简单的电路。 该电路包括用于在尖端和环形线之间耦合的分压器，而没有中间晶体管，并且具有节点，在该节点处呈现分压器两端的电压的缩放形式。 电路还包括晶体管，其具有耦合到节点的控制端子，耦合到电压源的第一电流端子和耦合到输出端子的第二电流端子，其中输出端子承载指示 尖端和环线两端的电压，从而电信线路是否摘机。
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10.发明申请公开(公告)号：US20110274266A1
公开(公告)日：2011-11-10
申请号：US13187683
申请日：2011-07-21
IPC分类号： H04M3/00
CPC分类号： H04M3/2272 , H04M3/14
摘要： In one embodiment, a low cost, simple circuit for detecting an off-hook condition of a telecommunication line comprising tip and ring signal lines is provided. The circuit comprises a voltage divider for coupling between the tip and ring lines without an intervening transistor and having a node at which is presented a scaled version of a voltage across the voltage divider. The circuit further comprises a transistor having a control terminal coupled to the node, a first current flow terminal coupled to a voltage source, and a second current flow terminal coupled to an output terminal, wherein the output terminal bears a value that is indicative of a voltage across the tip and ring lines and thus whether the telecommunication line is off-hook.
摘要翻译： 在一个实施例中，提供了用于检测包括尖端和环形信号线的电信线路的摘机状态的低成本，简单的电路。 该电路包括用于在尖端和环形线之间耦合的分压器，而没有中间晶体管，并且具有节点，在该节点处呈现分压器两端的电压的缩放形式。 电路还包括晶体管，其具有耦合到节点的控制端子，耦合到电压源的第一电流端子和耦合到输出端子的第二电流端子，其中输出端子承载指示 尖端和环线两端的电压，从而电信线路是否摘机。
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