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11. 发明授权

US2438496A Telephone system employing key type call transmitter 失效
标题翻译：采用键盘式呼叫发射机的电话系统
公开(公告)号：US2438496A
公开(公告)日：1948-03-30
申请号：US54094644
申请日：1944-06-19
申请人： INT STANDARD ELECTRIC CORP
发明人： GERALD DEAKIN
IPC分类号： H04M1/515 , H04Q1/18 , H04Q1/38
CPC分类号： H04M1/515 , H04Q1/18 , H04Q1/38

12. 发明授权

US2249154A Telephone ringing system 失效
公开(公告)号：US2249154A
公开(公告)日：1941-07-15
申请号：US30821639
申请日：1939-12-08
申请人： BELL TELEPHONE LABOR INC
发明人： MAURER KEITH L
IPC分类号： H01J17/40 , H04Q1/38
CPC分类号： H04Q1/38 , H01J17/40 , H01J2893/0067

13. 发明授权

US2133832A System for compensating for differences in potential 失效
标题翻译：用于补偿潜在差异的系统
公开(公告)号：US2133832A
公开(公告)日：1938-10-18
申请号：US14792537
申请日：1937-06-12
申请人： BELL TELEPHONE LABOR INC
发明人： PULLIS GEORGE A
IPC分类号： H04Q1/38
CPC分类号： H04Q1/38

14. 发明授权

US4815124A DX circuit 失效
标题翻译： DX电路
公开(公告)号：US4815124A
公开(公告)日：1989-03-21
申请号：US66606
申请日：1987-06-26
申请人： Blaine T. Bowers , Wayne E. Walters
发明人： Blaine T. Bowers , Wayne E. Walters
IPC分类号： H04M7/06 , H04Q1/38
CPC分类号： H04Q1/38
摘要： An improved DX circuit may be connected to signaling and reference leads of a DX signaling link, without need to balance the internal impedance of the DX circuit against that of the external DX signaling link. The DX circuit senses the magnitude and direction of current flow on the leads, and operates on the principle that when a near end signaling circuit is on-hook, a positive current flow indicates that a far end signaling circuit is off-hook and a current flow of zero indicates that it is on-hook, while if the near end signaling circuit is off-hook, a negative current flow indicates that the far end signaling circuit is on-hook and a current flow of zero indicates that it is off-hook. The arrangement allows the DX circuit to properly function irrespective of the resistive load presented by the DX signaling link. To enable the DX circuit to function with various capacitive loads, it also detects the rate of change of current on the leads and, in the absence of a change in status of the near end signaling circuit, provides an output representative of a change in the on-hook/off-hook status of the far end signaling circuit, immediately upon detecting a sufficient rate of change.
摘要翻译：改进的DX电路可以连接到DX信号链路的信令和参考引线，而不需要平衡DX电路的内部阻抗与外部DX信令链路的内部阻抗。 DX电路检测引线上电流的大小和方向，并且原理是当近端信号电路挂机时，正电流指示远端信号电路摘机，电流零流程表示它是挂机的，而如果近端信令电路摘机，则负电流指示远端信令电路挂机，当前的零电流表示其为“ 钩。该布置允许DX电路正确地工作，而与DX信号链路呈现的电阻负载无关。为了使DX电路能够与各种容性负载一起工作，它还检测引线上的电流变化率，并且在没有近端信号电路的状态改变的情况下，提供代表变化的输出在检测到足够的变化率时，立即进行远端信号电路的挂机/摘机状态。

15. 发明授权

US4614840A Telecommunication line circuit and associated polarity reversal circuit 失效
标题翻译：电信线路电路及相关极性反转电路
公开(公告)号：US4614840A
公开(公告)日：1986-09-30
申请号：US663273
申请日：1984-10-22
申请人： Luc A. Bienstman , Wlodimir J. Dobosch
发明人： Luc A. Bienstman , Wlodimir J. Dobosch
IPC分类号： H04M3/00 , H04M15/28 , H04M19/00 , H04Q1/38
CPC分类号： H04M19/005 , H04M15/28 , H04M3/005 , H04Q1/38
摘要： The present invention relates to a telecommunication line circuit including at least one line amplifier whose output is coupled to a telecommunication line conductor, and DC biasing means associated with said amplifier to apply thereto a DC bias signal of such a value that said amplifier cannot saturate when an AC metering signal is applied to it.
摘要翻译：电信线路电路技术领域本发明涉及一种电信线路电路，其包括至少一个线路放大器，其输出耦合到电信线路导体，以及与所述放大器相关联的DC偏置装置，以向其施加这样一个值的DC偏置信号，一个交流测量信号被施加到它。

16. 发明授权

US4551670A Circuit for maintaining the DC voltage on an electrically isolated telecommunication line at a reference level 失效
标题翻译：用于在参考电平上的电隔离电信线上维持直流电压的电路
公开(公告)号：US4551670A
公开(公告)日：1985-11-05
申请号：US602148
申请日：1984-04-19
申请人： James V. Anders , Thomas W. Anderson , Daniel D. Geiger , George F. Turnpaugh
发明人： James V. Anders , Thomas W. Anderson , Daniel D. Geiger , George F. Turnpaugh
IPC分类号： H04M19/00 , H04Q1/38 , H04Q3/42 , G05F1/46
CPC分类号： H04M19/001 , H04Q1/38
摘要： Disclosed is a line interface circuit (103) having a negative feedback circuit (205) for maintaining the DC voltage on an electrically isolated communications line at a reference level such as ground for private branch exchanges using ground start supervisory signaling. The feedback circuit comprises a low-pass filter (301), a difference amplifier (302), and two voltage-to-current sources (303,304) each having a high output impedance. The low-pass filter passes only the voltage on the line below a predetermined frequency. The difference amplifier subtracts the passed voltage from a ground reference level to form a difference voltage. Depending on the polarity of the difference voltage, the two voltage-to-current sources source and sink current to and from the line to maintain the DC voltage on the line at the reference level. A load resistor (305) also included in the feedback circuit keeps the circuit from oscillating where the phase shift of any signal through the circuit is an integer multiple of 360 degrees. The high output impedance of the two voltage-to-current sources does not effect the impedance balance on the line.
摘要翻译：公开了一种线路接口电路（103），其具有负反馈电路（205），用于在参考电平（例如使用地面启动监控信令的专用交换机交换机的地面）处将电压隔离的通信线路上保持直流电压。反馈电路包括低通滤波器（301），差分放大器（302）和两个具有高输出阻抗的电压 - 电流源（303,304）。低通滤波器仅将线路上的电压仅通过预定频率。差分放大器从接地参考电平减去通过的电压以形成差分电压。根据差分电压的极性，两个电压 - 电流源来源和吸收电流，以保持线路上的直流电压在参考电平。还包括在反馈电路中的负载电阻器（305）使得电路不会振荡，通过电路的任何信号的相移是360度的整数倍。两个电压 - 电流源的高输出阻抗不影响线路上的阻抗平衡。

17. 发明授权

US4440979A Current sink for DPT channel unit 失效
标题翻译： DPT通道单元的电流吸收器
公开(公告)号：US4440979A
公开(公告)日：1984-04-03
申请号：US373814
申请日：1982-05-03
申请人： Gregor D. McGibbon , Kenneth K. Yu
发明人： Gregor D. McGibbon , Kenneth K. Yu
IPC分类号： H04M7/00 , H04M7/06 , H04Q1/38
CPC分类号： H04M7/0096 , H04Q1/38
摘要： DC Saturation effects in the VF transformer of a DPT are reduced or eliminated with apparatus diverting cental office battery loop current away from windings of the transformer when a trunk circuit is seized for an off-hook condition of a calling parties telephone handset. A physically smaller transformer having increased inductance may then be employed for providing increased return loss at low frequencies. The apparatus comprises a current amplifier that is electrically connected across tip and ring lines, with a first switch means in its feedback path, and second switch means for AC coupling a transformer winding to the lines. When the trunk is idle for an on-hook condition of the handset, the amplifier is disabled and the lines are terminated with a large resistance. When the trunk is seized for an off-hook condition of the handset, binary PF and CF signals cause the current amplifier to shunt the resistor and to draw a prescribed amount of DC loop current on the lines for energizing a central office A-relay. This also turns on the second switch means for passing VF signals on the lines to and from the transformer, while blocking DC current from the winding, and terminating the lines with a prescribed impedance. When the calling party is dialing, the CF signal opens the feedback path so that the amplifier is turned hard on and off by pulsing of the PF signal for changing the termination impedance and causing resistive pulsing in the central office.
摘要翻译： DC在DPT的VF变压器中的饱和效应被降低或消除，当中继电路被抢占主叫方电话听筒的摘机状态时，设备将中心办公室电池回路电流远离变压器的绕组。可以采用具有增加的电感的物理上较小的变压器来在低频下提供增加的回波损耗。该装置包括电流放大器，其在尖端和环形线路之间电连接，其反馈路径中的第一开关装置和用于将变压器绕组交流耦合到线路的第二开关装置。当主干空闲时，手机的挂机状态，放大器被禁用，线路以大电阻终止。当主干被抓取到手机的摘机状态时，二进制PF和CF信号使得电流放大器分流电阻器，并在线路上引出规定数量的直流回路电流，以激励中心局A继电器。这也导通第二开关装置，用于使来自变压器的线路上的VF信号通过，同时阻断来自绕组的DC电流，并以规定的阻抗终止线路。当主叫方正在拨号时，CF信号打开反馈路径，通过脉冲PF信号来改变终端阻抗并引起中心局的电阻脉冲，使放大器变硬。

18. 发明授权

US4336467A Voltage detector 失效
标题翻译：电压检测器
公开(公告)号：US4336467A
公开(公告)日：1982-06-22
申请号：US117051
申请日：1980-01-31
申请人： Richard J. Lisco
发明人： Richard J. Lisco
IPC分类号： H03K17/30 , H04Q1/38 , H03K5/153
CPC分类号： H03K17/30 , H04Q1/38
摘要： A direct current voltage detector is disclosed including a low-pass filter, an isolating diode and a threshold detector. The circuit is designed to be simple and inexpensive and causes no interference with foreign potential and leakage tests on a telephone line.
摘要翻译：公开了一种直流电压检测器，其包括低通滤波器，隔离二极管和阈值检测器。该电路设计简单，价格便宜，不会干扰电话线上的外部电位和泄漏测试。

19. 发明授权

US4110565A Duplex telephone signalling system 失效
标题翻译：双工电话信令系统
公开(公告)号：US4110565A
公开(公告)日：1978-08-29
申请号：US819434
申请日：1977-07-27
申请人： Mauro L. Gaetano
发明人： Mauro L. Gaetano
IPC分类号： H04M7/02 , H04Q1/38 , H04Q3/00
CPC分类号： H04Q1/38 , H04Q3/00
摘要： Disclosed is circuitry interfacing telephone branch or trunk lines to provide D.C. driving voltages in response to, for example, on-hook and off-hook signals from a telephone set. The disclosed circuitry employs both lines to transmit useful signalling information to achieve, substantially, a doubling of the line voltage and a reduction of the common-mode burden on a differential voltage comparator for sensing the signalling information. These results are obtained with lower power dissipation than prior art systems.
摘要翻译：公开了电路接口电话分支或中继线，以响应于例如来自电话机的挂机和摘机信号提供直流驱动电压。所公开的电路采用两条线来发送有用的信令信息，以实质上增加线路电压的倍数，并且降低用于感测信令信息的差分电压比较器的共模负担。这些结果以比现有技术的系统更低的功率消耗获得。

20. 发明授权

US3991324A Dial pulse detector 失效
标题翻译：拨号脉冲检测器
公开(公告)号：US3991324A
公开(公告)日：1976-11-09
申请号：US570401
申请日：1975-04-22
申请人： Jan Hubert Ghislaan Venken
发明人： Jan Hubert Ghislaan Venken
IPC分类号： G01R29/027 , H03K3/017 , H03K3/288 , H03K5/04 , H03K17/28 , H04Q1/38 , H03K1/18
CPC分类号： H03K3/017 , G01R29/0273 , H03K17/28 , H03K3/288 , H03K5/04 , H04Q1/38
摘要： A two-level signalling or pulse correcting circuit which includes two delay circuits each feeding a section of a bistate output device. Each delay circuit has an individual time modifier circuit responsive to an input pulse duration of greater than a predetermined minimum for increasing the duration of an output pulse from said device to an interval between said minimum duration and a predetermined maximum duration.
摘要翻译：两级信令或脉冲校正电路，其包括两个延迟电路，每个延迟电路馈送双稳态输出装置的一部分。每个延迟电路具有响应于大于预定最小值的输入脉冲持续时间的单独时间修改器电路，用于将来自所述器件的输出脉冲的持续时间增加到所述最小持续时间和预定最大持续时间之间的间隔。

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