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1. 发明授权

US3854012A Switching circuit for preventing lost calls 失效
标题翻译：切换电路以防止丢失呼叫
公开(公告)号：US3854012A
公开(公告)日：1974-12-10
申请号：US35323673
申请日：1973-04-23
申请人： LORAIN PROD CORP
发明人： CHAMBERS C
IPC分类号： H04Q3/62 , H04M3/42
CPC分类号： H04Q3/625
摘要： A circuit for preventing the disconnection of PBX calls from a PBX in the presence of open circuits at ESS central offices. A switching network is adapted to assume a first operative state to establish a direct metallic connection between a central office and a PBX during the transmission therebetween of normal switching, signalling and talking currents such as dialing and ringing. The switching network is also adapted to assume a second operative state to apply battery potential and ground to the PBX to simulate a closed circuit condition to a PBX call in the presence of open circuits at the central office. Novel sensing circuitry is provided to distinguish between the central office and PBX conditions under which operation of the switching network in the first state is desirable and the central office and PBX conditions under which operation of the switching network in the second state is desirable, thus assuring that under certain conditions lost calls are prevented without interfering with normal telephone system operations.
摘要翻译：一种用于在ESS中心局存在开路的情况下防止集团电话断开PBX呼叫的电路。交换网络适于采取第一操作状态，以在正常切换，信令和通话电流（例如拨号和振铃）之间的传输期间在中心局和PBX之间建立直接金属连接。交换网络还适于采取第二操作状态，以在中央局处存在开放电路的情况下将电池电势和接地施加到集团电话以模拟PBX呼叫的闭路状态。提供新颖的感测电路以区分中央局和PBX条件，在该情况下，期望在第一状态下的交换网络的操作以及期望在第二状态下的交换网络的操作的中心局和PBX条件，从而确保在某些情况下，在不干扰正常电话系统操作的情况下，防止丢失呼叫被阻止。

2. 发明授权

US3818151A Method and apparatus for amplifying signal transmission through transmission lines 失效
标题翻译：通过传输线放大信号传输的方法和装置
公开(公告)号：US3818151A
公开(公告)日：1974-06-18
申请号：US32678573
申请日：1973-01-26
申请人： LORAIN PROD CORP
发明人： CHAMBERS C , KIKO F
IPC分类号： H03F3/62 , H04B3/04 , H04B3/06 , H04B3/38 , H04M7/04 , H04B3/36
CPC分类号： H04B3/04 , H03F3/62
摘要： A circuit for increasing the amplitude of signals transmitted through a two-wire transmission line. Amplifying voltage generating means generates and introduces in series with the transmission line an amplifying voltage that varies in accordance with the signal voltage across the transmission line. Amplifying current generating means generates and introduces in shunt with the transmission line an amplifying current that varies in accordance with the signal current through the transmission line. Gain control means varies the ratio of amplifying voltage to signal voltage and the ratio of amplifying current to signal current, as a function of frequency, to provide frequency compensated gain and impedance matching for each frequency in the band of frequencies to be transmitted through the transmission line.
摘要翻译：用于增加通过双线传输线传输的信号幅度的电路。放大电压发生装置与传输线串联产生并根据传输线上的信号电压而变化的放大电压。放大电流产生装置根据传输线上的信号电流，在传输线路上产生和分流放大电流。增益控制装置改变放大电压与信号电压的比率以及放大电流与信号电流的比率作为频率的函数，以提供频率补偿的增益和阻抗匹配，以便通过传输频率的频带中的每个频率线。

3. 发明授权

US3763320A Voltage booster circuit having test-through characteristics 失效
标题翻译：具有测试特性的电压增压器电路
公开(公告)号：US3763320A
公开(公告)日：1973-10-02
申请号：US3763320D
申请日：1971-10-20
申请人： LORAIN PROD CORP
发明人： CHAMBERS C
IPC分类号： H04M19/00
CPC分类号： H04M19/006
摘要： A circuit for increasing the magnitude of subscriber line current flow in a variety of types of telephone systems. A voltage booster network is connected in series with at least one conductor of a subscriber line. Each voltage booster network includes circuitry for conducting subscriber line current in first and second directions therethrough. D-C boost voltage supply means is connected to each booster network to additively increase the flow of subscriber line current therethrough. Each voltage booster network includes control circuitry which causes that network to exhibit a boost voltage-line current characteristic having a low current region wherein substantially no boost voltage is produced allowing accurate line testing therethrough, a middle current region wherein the boost voltage increases substantially linearly with line current affording pulse adjustment and a high current region wherein the boost voltage remains substantially constant with line current to provide voltage boosting which is stable with respect to variations in line current. Each voltage booster network also includes time-delay circuitry which slows the dynamic response of the circuit of the invention to prevent the latter from increasing the amplitude of the transient currents which accompany telephone system polarity reversals and thereby reduce the probability of premature ring-trip or other undesirable relay operation.
摘要翻译：一种用于增加各种类型的电话系统中用户线电流的幅度的电路。升压网络与用户线路的至少一个导体串联连接。每个升压器网络包括用于在第一和第二方向上进行用户线路电流的电路。 D-C升压电压装置连接到每个增压器网络以增加用户线电流流过其中。每个升压网络包括控制电路，其使得该网络呈现具有低电流区域的升压电压线电流特性，其中基本上不产生升压电压，允许通过其进行精确的线路测试;中间电流区域，其中升压电压基本上与提供脉冲调节的线路电流和高电流区域，其中升压电压基本上保持与线电流恒定，以提供相对于线路电流变化稳定的升压。每个升压器网络还包括时延延迟电路，其减慢本发明的电路的动态响应，以防止后者增加伴随电话系统极性反转的瞬态电流的振幅，从而降低过早跳闸的概率，或者其他不良继电器操作。

4. 发明授权

US3763319A Impedance responsive voltage booster circuit for telephone systems 失效
标题翻译：用于电话系统的阻抗响应式电压增强器电路
公开(公告)号：US3763319A
公开(公告)日：1973-10-02
申请号：US3763319D
申请日：1971-02-22
申请人： LORAIN PROD CORP
发明人： CHAMBERS C
IPC分类号： H04M19/00
CPC分类号： H04M19/006
摘要： The invention includes a circuit for additively increasing the d-c operating voltage of long subscriber lines in telephone systems utilizing reverse battery supervision. A plurality of switching circuits are disposed in series with respective conductors of a subscriber line to maintain voltage booster sources in series, power-aiding relationship between a central office battery and a long subscriber line. The circuit of the invention also prevents the voltage booster sources from increasing the voltage which the central office battery applies to the long subscriber line when the long subscriber line is open-circuited at the subscriber station as, for example, during dial pulse interruptions. This assures that the voltage boosting circuitry can increase the level of current flowing through the long subscriber line without impairing the dialing characteristics of that line.
摘要翻译：本发明包括一种电路，用于通过反向电池监控来增加电话系统中长用户线路的d-c工作电压。多个开关电路与用户线路的各个导体串联布置，以保持升压电源串联，中心局电池和长用户线路之间的电源辅助关系。本发明的电路还防止当长用户线路在订户台处开路时，例如在拨号脉冲中断期间，升压电源增加中心局电池对长用户线路施加的电压。这确保升压电路可以增加流过长用户线路的电流电平，而不会损害该线路的拨号特性。

5. 发明授权

US3828139A Disconnect circuit for telephone systems 失效
标题翻译：断开电话系统的电路
公开(公告)号：US3828139A
公开(公告)日：1974-08-06
申请号：US29992472
申请日：1972-10-24
申请人： LORAIN PROD CORP
发明人： CHAMBERS C
IPC分类号： H04M3/30 , H04M19/00 , H04M3/24 , H04B3/46
CPC分类号： H04M19/006 , H04M3/30
摘要： A circuit for automatically disconnecting circuitry such as voltage booster circuitry from a subscriber line to prevent such circuitry from interfering with the measurement of voltage and current on that line. The circuit includes booster disconnect switches which, in a first operative state, connect the voltage booster circuitry in aiding relationship to current flow through the subscriber line and which, in a second operative state, disconnect the voltage booster circuitry from the line and substitute therefore one or more current bypass conductors. A control circuit responsive to both the voltage across and current through the line controls the disconnect switches, as required, to establish the first operative state thereof when the subscriber line is being used by a subscriber and to establish the second operative state thereof when the subscriber line is being tested in either a high voltage-low current mode or a low voltage-high current mode.
摘要翻译：用于从用户线路自动断开诸如升压电路的电路的电路，以防止这种电路干扰该线路上的电压和电流的测量。该电路包括升压器断开开关，其在第一操作状态下将升压电路与辅助关系连接到通过用户线的电流，并且在第二操作状态下，将升压电路与线路断开，并由此替代一个或更多的当前旁路导体。响应于两端的电压和通过线路的电流的控制电路根据需要控制断开开关，以便当用户线由用户使用时建立其第一操作状态，并且当用户建立其第二操作状态时线路正在高压低电流模式或低电压 - 高电流模式下测试。

6. 发明授权

US3818338A Magnetizing current compensating circuit 失效
标题翻译：磁化电流补偿电路
公开(公告)号：US3818338A
公开(公告)日：1974-06-18
申请号：US29100172
申请日：1972-09-21
申请人： LORAIN PROD CORP
发明人： CHAMBERS C , KIKO F
IPC分类号： G01R19/00 , G01R33/025 , G01R1/20 , G01R15/10
CPC分类号： G01R33/025 , G01R19/0092
摘要： A circuit for eliminating the effect of magnetizing current flow on load current measurements made through transformers. A current indicating network provides an output voltage proportional to both the magnetizing and load components of the current through a transformer without substantially affecting the magnitude of the voltage across or current through that transformer. A compensating current generating circuit generates a current which is equal in magnitude and opposite in phase to the magnetizing current flow through the transformer over a wide band of frequencies. This compensating current is applied to the current indicating network in cancelling relationship to the magnetizing current component of the current through the transformer to render the output voltage indication independent of magnetizing current flow so that the load current component can be accurately measured.
摘要翻译：用于消除磁化电流对通过变压器进行的负载电流测量的影响的电路。电流指示网络提供与通过变压器的电流的磁化和负载分量成比例的输出电压，而基本上不影响通过该变压器的电流或电流的大小。补偿电流产生电路在宽频带上产生大小相等的电流与通过变压器的磁化电流相反的电流。该补偿电流被施加到电流指示网络，以消除与通过变压器的电流的磁化电流分量的关系，以使得输出电压指示独立于磁化电流流动，从而可以精确地测量负载电流分量。

7. 发明授权

US3852536A Test-through voltage booster circuit for telephone systems 失效
标题翻译：用于电话系统的测试 - 电压升压电路
公开(公告)号：US3852536A
公开(公告)日：1974-12-03
申请号：US36077573
申请日：1973-05-16
申请人： LORAIN PROD CORP
发明人： CHAMBERS C
IPC分类号： H04M3/30 , H04M19/00 , H04Q1/28
CPC分类号： H04M3/30 , H04M19/006
摘要： A telephone system voltage booster circuit adapted to provide a d-c boost voltage in series-aiding relationship to the current in a subscriber line when ordinary telephone system operating current is passed through that subscriber line and not to provide a d-c boost voltage when test currents are passed through that subscriber line. The booster circuit includes circuitry which provides a first or boosting path for subscriber line current therethrough when the magnitude of the driving voltage from the central office and the magnitude of the line current exceed predetermined values. The booster circuit also includes circuitry which provides a second or non-boosting path for current therethrough when either the magnitude of the driving voltage from the central office or the magnitude of the line current are less than those predetermined values. As a result, both high voltage-low current and low voltage-high current test current measurements may be made, with the booster circuit in place, without the undesired introduction of a boost voltage that affects the accuracy of those measurements.
摘要翻译：一种电话系统升压电路，其适于在普通电话系统工作电流通过该用户线路时提供与用户线路中的电流串联关系的直流升压电压，并且当测试电流通过时不提供直流升压电压通过该用户线。升压电路包括当来自中心局的驱动电压的大小和线路电流的大小超过预定值时，为通过其中的用户线电流提供第一或升压路径的电路。升压电路还包括当来自中心局的驱动电压的大小或线路电流的幅度小于那些预定值时提供用于电流通过的第二或非升压路径的电路。因此，可以在升压电路就位的情况下进行高电压 - 低电流和低电压 - 高电流测试电流测量，而不会不期望地引入影响这些测量精度的升压电压。

8. 发明授权

US3828281A Impedance simulating circuit for transmission lines 失效
标题翻译：用于传输线路的阻抗仿真电路
公开(公告)号：US3828281A
公开(公告)日：1974-08-06
申请号：US33548873
申请日：1973-02-26
申请人： LORAIN PROD CORP
发明人： CHAMBERS C
IPC分类号： H03H11/30 , H03H11/40 , H03H11/44 , H03H11/48 , H03H11/00
CPC分类号： H03H11/405 , H03H11/30 , H03H11/44 , H03H11/48
摘要： A circuit for simulating the presence of positive or negative impedances in shunt or in series with a transmission line. A voltage generating circuit generates an impedance simulating voltage and introduces that voltage in series with the transmission line. A current generating circuit generates an impedance simulating current and introduces that current in shunt with the transmission line. Current feedback circuitry controls the voltage generating circuitry in accordance with the amplitude of the signal current in the transmission line to simulate either a positive or negative series impedance. Voltage feedback circuitry controls the current generating circuitry in accordance with the signal voltage across the transmission line to simulate either a positive or negative shunt impedance. Circuitry is also provided to afford these simulated impedances in the presence of echo suppressing and impedance matching characteristics.
摘要翻译：用于模拟分流或与传输线串联的正阻抗或负阻抗的电路。电压产生电路产生阻抗模拟电压并将该电压与传输线串联。电流产生电路产生阻抗模拟电流，并将该电流与传输线分流。电流反馈电路根据传输线中的信号电流的幅度来控制电压产生电路，以模拟正或负的串联阻抗。电压反馈电路根据传输线上的信号电压控制电流产生电路，以模拟正或负分流阻抗。还提供电路以在存在回波抑制和阻抗匹配特性的情况下提供这些模拟阻抗。

9. 发明授权

US3825698A Test-through circuit for telephone system voltage boosters 失效
标题翻译：用于电话系统电压调节器的测试电路
公开(公告)号：US3825698A
公开(公告)日：1974-07-23
申请号：US27669672
申请日：1972-07-31
申请人： LORAIN PROD CORP
发明人： CHAMBERS C
IPC分类号： H04M3/30 , H04M19/00 , H04Q1/30
CPC分类号： H04M3/30 , H04M19/006
摘要： A circuit for automatically disconnecting a voltage booster circuit which is in service in a subscriber line to prevent the booster circuit from interfering with the taking of voltage and current measurements on the line. The circuit includes booster disconnect switches which, in a first operative state, connect the voltage booster circuit in current increasing relationship to a subscriber line and which, in a second operative state, disconnect the voltage booster from the line and substitute therefor a bypass conductor. A control circuit responsive to the voltage between either subscriber line conductor and a reference of fixed potential controls the booster disconnect switches, as required, to establish the first operative state thereof when the subscriber line is not being tested and to establish the second operative state thereof when the line is being tested.
摘要翻译：用于自动断开在用户线路中服务的升压电路的电路，以防止升压电路干扰在线路上的电压和电流测量。该电路包括升压器断开开关，其在第一操作状态下以升高电流的形式将升压电路与用户线路连接，并且在第二操作状态下，将升压器与线路断开并用旁路导体代替。响应于用户线路导体和固定电位基准之间的电压的控制电路根据需要控制升压断开开关，以在用户线路未被测试时建立其第一操作状态并建立其第二操作状态当线路被测试时。

10. 发明授权

US3815041A Amplifier circuit having a multiplicity of discrete operative states 失效
标题翻译：具有离散操作状态的多功能放大器电路
公开(公告)号：US3815041A
公开(公告)日：1974-06-04
申请号：US26264272
申请日：1972-06-14
申请人： LORAIN PROD CORP
发明人： CHAMBERS C
IPC分类号： H03G1/00 , H04B3/36 , H03F21/00
CPC分类号： H04B3/36 , H03G1/007
摘要： A controllable amplifier (or attenuator) having a plurality of operative states. In a first state, an amplifier control network energizes an amplifier in accordance with an input signal and a first gain control network to produce an output signal which is in phase with the input signal. In a second state, the amplifier control network energizes the amplifier in accordance with the input signal and a second gain control network to produce an output signal which is substantially 180* out of phase with the input signal. In a third or non-amplifying state, the amplifier control network prevents the generation of an output signal. The amplifier control network is adapted to be controlled by an externally generated control signal such as a signal indicating the dominant direction of voice transmission in a transmission line.
摘要翻译：具有多个操作状态的可控放大器（或衰减器）。在第一状态下，放大器控制网络根据输入信号和第一增益控制网络激励放大器，以产生与输入信号同相的输出信号。在第二状态下，放大器控制网络根据输入信号激励放大器和第二增益控制网络，以产生与输入信号基本上为180度异相的输出信号。在第三或非放大状态下，放大器控制网络防止产生输出信号。放大器控制网络适于由外部产生的控制信号控制，例如指示传输线中语音传输的主要方向的信号。

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