公开(公告)号：US06665398B1

公开(公告)日：2003-12-16

申请号：US09145182

申请日：1998-09-01

Applicant: Christopher Ludeman

Inventor： Christopher Ludeman

IPC: H04M100

CPC classification number: H04Q11/04 ,  H04Q2213/13003 ,  H04Q2213/13082 ,  H04Q2213/1319 ,  H04Q2213/13305 ,  H04Q2213/1332 ,  H04Q2213/13381

Abstract: A subscriber loop interface circuit and method for externally programming the on-hook, off-hook, and transition states of the subscriber loop interface circuit. The circuit having an off-hook overhead sufficient for long loop applications and having a continuous loop current to loop voltage relationship. The circuit may have plural means for generating reference currents for comparison with loop currents.

Abstract translation: 一种用于外部编程用户环路接口电路的挂机，摘机和转换状态的用户环路接口电路和方法。 该电路具有足够长的环路应用的脱钩开关，并具有连续的环路电流与环路的电压关系。 该电路可以具有用于产生用于与环路电流进行比较的参考电流的多个装置。

公开(公告)号：US06519322B1

公开(公告)日：2003-02-11

申请号：US09208457

申请日：1998-12-10

Applicant: Christopher Ludeman

Inventor： Christopher Ludeman

IPC: H04M124

CPC classification number: H04M3/30 ,  H04M3/005 ,  H04M3/02 ,  H04M3/2272

Abstract: A method and apparatus for internally testing portions of a subscriber loop interface circuit. Testing may be conducted on a semiconductor circuit including the subscriber loop interface circuit. The portion of the subscriber loop interface circuit being tested may be the ring trip detector and/or the off-hook detect circuit. Testing of may be conducted without disabling the capability of the subscriber loop interface circuit to monitor the hook status of a subscriber.

Abstract translation: 一种用于内部测试用户环路接口电路的部分的方法和装置。 可以在包括用户环路接口电路的半导体电路上进行测试。 被测试的用户环路接口电路的部分可以是环路跳闸检测器和/或摘机检测电路。 可以在不禁止用户环路接口电路监视用户的挂起状态的能力的情况下进行测试。

公开(公告)号：US07492826B2

公开(公告)日：2009-02-17

申请号：US11254005

申请日：2005-10-19

Applicant: Christopher Ludeman

Inventor： Christopher Ludeman

IPC: H04B3/00 ,  H04L25/00

CPC classification number: H04B3/03 ,  H04Q2213/1302 ,  H04Q2213/1304 ,  H04Q2213/1319 ,  H04Q2213/13306 ,  H04Q2213/1332

Abstract: A bidirectional crosspoint switch interface employs a pair of backward-connected transimpedance amplifiers of the type disclosed in the L. Enriquez U.S. Pat. No. 6,411,163, and associated scaling current mirrors that drive nodes of associated reverse signal cancellation circuits. The reverse signal cancellation circuits are coupled to respective pairs of ports of the crosspoint switch and input and output ports of 1:1 current mirrors, in a manner that affords bidirectional buffering between the crosspoint switch and a pair of bidirectional signaling ports that terminate respective signaling links, without signal reflections.

Abstract translation: 双向交叉点开关接口采用了L. Enriquez美国专利中公开的一对后向连接的跨阻抗放大器。 以及相关的缩放电流镜，其驱动相关联的反向信号消除电路的节点。 反向信号消除电路以交叉点开关的相应端口和1：1电流镜的输入和输出端口耦合，以便在交叉点开关和一对双向信令端口之间提供双向缓冲，这些双向信号端口终止相应的信号 链接，没有信号反射。

公开(公告)号：US07020248B2

公开(公告)日：2006-03-28

申请号：US10078362

申请日：2002-02-21

Applicant: Christopher Ludeman

Inventor： Christopher Ludeman

IPC: H04M1/24

CPC classification number: H04M3/30 ,  H04M3/005 ,  H04M3/02 ,  H04M3/2272

Abstract: A method and apparatus for internally testing portions of a subscriber loop interface circuit. Testing may be conducted on a semiconductor circuit including the subscriber loop interface circuit. The portion of the subscriber loop interface circuit being tested may be the ring trip detector and/or the off-hook detect circuit. Testing may be conducted without disabling the capability of the subscriber loop interface circuit to monitor the hook status of a subscriber.

公开(公告)号：US06931108B2

公开(公告)日：2005-08-16

申请号：US10390229

申请日：2003-03-17

Applicant: Christopher Ludeman

Inventor： Christopher Ludeman

IPC: H04L12/40 ,  H04M11/00

CPC classification number: H04L12/40006

Abstract: A telecommunication interface integrates DSL and POTS components in a manner which effectively separates their bandwidth requirements from their power requirements. This is accomplished by powering the tip path and ring path amplifiers with a pair of transformer-coupled floating power supply-sourced voltages, and referencing respective like polarity inputs of the amplifiers to a differential voltage pair that is used to operate the subscriber loop, including providing loop current and controllably applying a ringing voltage to the POTS line.

Abstract translation: 电信接口以有效地将其带宽要求与其功率需求分开的方式集成DSL和POTS组件。 这是通过用一对变压器耦合的浮动电源源电压为尖端路径和环路放大器供电，并将放大器的相应相似的极性输入参考用于操作用户环路的差分电压对来实现的，包括 提供回路电流并可控制地向POTS线施加振铃电压。

公开(公告)号：US20070132501A1

公开(公告)日：2007-06-14

申请号：US11419620

申请日：2006-05-22

Applicant: Donald Koch ,  Douglas Youngblood ,  Christopher Ludeman

Inventor： Donald Koch ,  Douglas Youngblood ,  Christopher Ludeman

IPC: H03K17/00

CPC classification number: H03K17/063 ,  H03K17/005 ,  H03K17/6871

Abstract: A MOSFET-based, multi signal-switching circuit controllably passes analog/audio signals and digital signals through a common terminal to a single connector. Analog/audio signals are coupled through a single N-channel MOSFET analog signal switch which, when turned-ON, minimizes distortion of the analog/audio signal and capacitive loading to an adjacent, MOS-based or CMOS-based digital data signal switch. A respective turn-OFF circuit maintains its associated switch MOSFET turned OFF.

Abstract translation: 基于MOSFET的多信号切换电路可控制地将模拟/音频信号和数字信号通过公共端子传递到单个连接器。 模拟/音频信号通过单个N沟道MOSFET模拟信号开关进行耦合，当开启导通时，模拟/音频信号的失真和对相邻的基于MOS或基于CMOS的数字信号开关的电容负载最小化。 相应的关断电路将其关联的开关MOSFET保持关闭。

公开(公告)号：US06233335B1

公开(公告)日：2001-05-15

申请号：US09079304

申请日：1998-05-15

Applicant: Christopher Ludeman

Inventor： Christopher Ludeman

IPC: H04M1738

CPC classification number: H04M19/005

Abstract: A subscriber loop interface circuit is provided that includes a current directing element for directing current from the output stage of line interface amplifiers. The current is directed to a secondary power supply having a magnitude lower than the conventional primary power supply of a subscriber loop interface circuit in supplying power to a subscriber loop.

Abstract translation: 提供了一种用户环路接口电路，其包括用于引导来自线路接口放大器的输出级的电流的电流引导元件。 电流被引导到次级电源，其次级低于用户环路接口电路的常规主电源，以向用户环路供电。

公开(公告)号：US07386015B1

公开(公告)日：2008-06-10

申请号：US10823362

申请日：2004-04-13

Applicant: Douglas L. Youngblood ,  Christopher Ludeman

Inventor： Douglas L. Youngblood ,  Christopher Ludeman

IPC: H04J3/04 ,  H04J3/02

CPC classification number: H04J3/047

Abstract: A digitally configurable multiplexer/de-multiplexer including several multiplexers, a switch matrix, and configuration logic. Each multiplexer receives multiple address signals, selects from among multiple first data signals and couples a selected first data signal to a corresponding one of several multiplexed signals. The switch matrix has a first interface coupled to the multiplexed signals and a second interface coupled to multiple second data signals. The configuration logic receives selection signals and controls the switch matrix to couple selected ones of the multiplexed signals to the second interface.

Abstract translation: 数字可配置的多路复用器/解复用器，包括多个多路复用器，开关矩阵和配置逻辑。 每个多路复用器接收多个地址信号，从多个第一数据信号中进行选择，并将所选择的第一数据信号耦合到多个多路复用信号中的一个。 开关矩阵具有耦合到多路复用信号的第一接口和耦合到多个第二数据信号的第二接口。 配置逻辑接收选择信号并控制开关矩阵以将选择的多路复用信号耦合到第二接口。

公开(公告)号：US20060233264A1

公开(公告)日：2006-10-19

申请号：US11254005

申请日：2005-10-19

Applicant: Christopher Ludeman

Inventor： Christopher Ludeman

IPC: H04B3/00

CPC classification number: H04B3/03 ,  H04Q2213/1302 ,  H04Q2213/1304 ,  H04Q2213/1319 ,  H04Q2213/13306 ,  H04Q2213/1332

Abstract: A bidirectional crosspoint switch interface employs a pair of backward-connected transimpedance amplifiers of the type disclosed in the U.S. Patent to L. Enriquez, U.S. Pat. No. 6,411,163, and associated scaling current mirrors that drive nodes of associated reverse signal cancellation circuits. The reverse signal cancellation circuits are coupled to respective pairs of ports of the crosspoint switch and input and output ports of 1:1 current mirrors, in a manner that affords bidirectional buffering between the crosspoint switch and a pair of bidirectional signaling ports that terminate respective signaling links, without signal reflections.

Abstract translation: 双向交叉点开关接口采用在美国专利授予L.Enriquez的美国专利中公开的一对后向连接的跨阻抗放大器。 以及相关的缩放电流镜，其驱动相关联的反向信号消除电路的节点。 反向信号消除电路以交叉点开关的相应端口和1：1电流镜的输入和输出端口耦合，以便在交叉点开关和一对双向信令端口之间提供双向缓冲，这些双向信号端口终止相应的信号 链接，没有信号反射。

公开(公告)号：US20050226439A1

公开(公告)日：2005-10-13

申请号：US10851597

申请日：2004-05-21

Applicant: Christopher Ludeman

Inventor： Christopher Ludeman

IPC: H04R3/00 ,  H04R29/00

CPC classification number: H04R3/002

Abstract: An active noise cancellation system includes at least one amplifier, and a speaker driven by the amplifier. The speaker comprises a speaker coil and a spaced apart speaker magnet mounted on a diaphragm. The speaker current in the speaker coil comprises a signal originating from a signal source and an ambient induced back current noise signal. The amplifier virtually losslessly senses the speaker current without the need for inherently lossy sensing resistors. A feedback circuit receives the speaker current sensed and output by the amplifier and provides a feedback signal comprising a modified version of the noise signal to a summing point, wherein the feedback signal and the signal from the signal source are mixed. The summing point is coupled to an input of the amplifier. By adding the feedback signal in the correct anti-phase to the signal from the signal source, the noise in the vicinity of the ear/speaker is virtually eliminated.

Abstract translation: 主动噪声消除系统包括至少一个放大器和由放大器驱动的扬声器。 扬声器包括扬声器线圈和安装在隔膜上的间隔开的扬声器磁体。 扬声器线圈中的扬声器电流包括源自信号源的信号和环境感应的反向电流噪声信号。 放大器实际上无损地感测扬声器电流，而不需要固有的有损耗的感测电阻器。 反馈电路接收由放大器检测和输出的扬声器电流，并将包括噪声信号的修改版本的反馈信号提供给求和点，其中反馈信号和来自信号源的信号被混合。 求和点耦合到放大器的输入端。 通过将来自信号源的信号的反馈信号加到正确的反相中，实际上消除了耳朵/扬声器附近的噪声。