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    Bidirectional additive amplifier
    21.
    发明授权
    Bidirectional additive amplifier 失效
    双向增效放大器

    公开(公告)号：US3573402A

    公开(公告)日：1971-04-06

    申请号：US3573402D

    申请日：1969-03-25

    Applicant: LORAIN PROD CORP

    Inventor： CHAMBERS CHARLES W JR

    IPC: H03F3/62 ,  H04B3/38 ,  H04M19/00

    CPC classification number: H03F3/62 ,  H04B3/38 ,  H04M19/006

    Abstract: An electrical, two-terminal, bidirectional amplifier circuit which senses the direction of flow of a signal current through an ancillary source-load loop in which current flow may be bidirectional, to insert a boost voltage additively in series aiding relationship with the signal current irrespective of the direction of current flow in that source-load loop and then senses the instantaneous state of the signal current to control the magnitude of the added power. The amplifier is insensitive to the direction of transmitted intelligence through the source-load loop by the signal current and inserts the boost voltage additively as required, in the face of the interchange of position of the sources and receivers of intelligence with respect to the amplifier terminals as, for instance, in telephone circuitry.

    Ground fault detector
    25.
    发明授权
    Ground fault detector 失效
    地面故障检测器

    公开(公告)号：US5113426A

    公开(公告)日：1992-05-12

    申请号：US573130

    申请日：1990-09-19

    Applicant: Kazumi Kinoshita ,  Kenji Takato ,  Toshiro Tojo

    Inventor： Kazumi Kinoshita ,  Kenji Takato ,  Toshiro Tojo

    IPC: H04M3/30 ,  H04M19/00

    CPC classification number: H04M19/008 ,  H04M19/006 ,  H04M3/30

    Abstract: In a ground fault detector for long distance subscriber lines accommodated in a small capacity digital electronic exchange, a DC/DC converter for power supply is stopped during detection of ground fault. Upon reception of the stop signal, the DC/DC converter converts the power supply voltage for the subscribers to a voltage as the system power supply of the exchange, namely to a low voltage before voltage conversion of the DC/DC converter. The battery feed circuit can maintain the alarm condition, even if a current flows continuously to the battery feed resistor due to a ground fault, until the ground fault is recovered by the maintenance person without breaking the resistor.

    Abstract translation: PCT No.PCT / JP90 / 00036 Sec。 371 1990年9月19日第 102（e）1990年9月19日PCT PCT 1990年1月12日PCT公布。 出版物WO90 / 08441 日期：1990年7月26日。在容纳在小容量数字电子交换机中的长距离用户线路的接地故障检测器中，在接地故障检测期间停止用于电源的DC / DC转换器。 在接收到停止信号时，DC / DC转换器将用户的电源电压转换为电压作为交换机的系统电源，即在DC / DC转换器的电压转换之前为低电压。 即使电流由于接地故障而连续流向电池供电电阻，电池供电电路也可以保持报警状态，直到维护人员接地故障恢复，而不会中断电阻。

    Resistance detector with delayed hysteresis
    26.
    发明授权
    Resistance detector with delayed hysteresis 失效
    电阻检测器滞后滞后

    公开(公告)号：US4296337A

    公开(公告)日：1981-10-20

    申请号：US84915

    申请日：1979-10-15

    Applicant: Dale E. Stone

    Inventor： Dale E. Stone

    IPC: H04M19/00 ,  H03K5/24

    CPC classification number: H04M19/006

    Abstract: The disclosure shows a telephone range extender which is automatically adaptable to the length of the connected subscriber loop. A loop resistance detector within the range extender discriminates between loops within a plurality of ranges of lengths. For extremely short loops not requiring range extension, the range extender circuits are disconnected from the loop. For intermediate length loops, the gain of a bidirectional voice frequency amplifier is set at a low value to provide just sufficient gain for these loops. For longer loops, the gain of the amplifier is increased to provide sufficient amplification for the longer range. For extremely long loops, the range extender is disconnected since such loops must be served by remote amplification facilities. An automatic range extender of this type is shown connected behind the first stage of the central office switch in order to concentrate range extenders on a large plurality of subscriber loops.

    Abstract translation: 本公开示出了电话范围扩展器，其自动适应所连接的用户环路的长度。 范围扩展器内的环路电阻检测器在多个长度范围内的环路之间进行区分。 对于不需要范围扩展的极短的回路，范围扩展器电路与环路断开连接。 对于中间长度环路，双向语音放大器的增益设置为低值，以便为这些环路提供足够的增益。 对于较长的环路，放大器的增益会增加，以便为更长的范围提供足够的放大。 对于极长的回路，范围扩展器是断开的，因为这样的环路必须由远程放大设备提供。 这种类型的自动量程扩展器被示为连接在中心局交换机的第一级之后，以便将范围扩展器集中在大量多个用户环路上。

    Telephone ringing extender
    27.
    发明授权
    Telephone ringing extender 失效
    电话铃声扩展器

    公开(公告)号：US4144408A

    公开(公告)日：1979-03-13

    申请号：US873476

    申请日：1978-01-30

    Applicant: Roger E. Holtz ,  Bernard A. Tilson ,  Gordon D. Woods

    Inventor： Roger E. Holtz ,  Bernard A. Tilson ,  Gordon D. Woods

    IPC: H04M19/00 ,  H04Q1/44

    CPC classification number: H04M19/006

    Abstract: A telephone ringing extender is shown which includes a ringing signal detector and a switch. In response to ringing signals, the ringing extender grounds the tip conductor to operate telephone ringers bridged on the loop. Protection against excessive voltages and excessive currents is also provided.

    Abstract translation: 示出了一个电话铃声扩展器，其包括振铃信号检测器和开关。 响应振铃信号，振铃扩展器接地尖端导体来操作桥接在环路上的电话铃声。 还提供了防止过电压和过大电流的保护。

    Voltage boost circuit for telephone systems
    28.
    发明授权
    Voltage boost circuit for telephone systems 失效
    电话系统的升压电路

    公开(公告)号：US4127747A

    公开(公告)日：1978-11-28

    申请号：US836063

    申请日：1977-09-23

    Applicant: Israel Levi

    Inventor： Israel Levi

    IPC: H04M19/00 ,  H04Q1/30

    CPC classification number: H04M19/006

    Abstract: In a voltage boost circuit, for telephone systems where reverse battery supervision is employed, optically coupled semiconductor devices are used to control both the polarity and the charge on a nonpolar capacitor. This capacitor is powered from a DC to DC converter and the capacitor serves the dual functions of a rectifier filter capacitor and a voice frequency (VF) bypass capacitor. The voltage boost circuit charges the capcitor so that it aids the central office battery, thus extending the normal operating range of the central office. Whenever the current in the loop drops below a predetermined threshold level, the voltage boost is removed by a rapid discharge of the aformentioned capacitor. When the loop is closed, the capacitor is quickly chared to the full boost voltage with a polarity so as to aid, or increase, the current in the loop.

    Abstract translation: 在升压电路中，对于使用反向电池监视的电话系统，光耦合半导体器件用于控制非极性电容器上的极性和电荷。 该电容器由DC到DC转换器供电，电容器用于整流滤波电容器和语音（VF）旁路电容器的双重功能。 升压电路为电容器充电，从而有助于中心局电池，从而延长了中心局的正常工作范围。 每当环路中的电流下降到预定的阈值电平以下时，通过上述电容器的快速放电来消除升压。 当环路闭合时，电容器以极性快速地对准整个升压电压，以帮助或增加回路中的电流。

    Loop extender
    29.
    发明授权
    Loop extender 失效
    循环延长器

    公开(公告)号：US4122312A

    公开(公告)日：1978-10-24

    申请号：US873849

    申请日：1978-01-31

    Applicant: Frederick J. Glenn

    Inventor： Frederick J. Glenn

    IPC: H04M19/08 ,  H04M19/00 ,  H04Q1/30

    CPC classification number: H04M19/006

    Abstract: A loop extender is used in conjunction with a pair of telephone lines extending from a telephone central office to a subscriber location in order to insert a booster DC potential on the telephone lines in such a manner as to aid the flow of DC current produced on the telephone lines by a telephone central office battery. A control circuit has one input terminal coupled to one of the telephone lines and a reference terminal, another input terminal coupled to the other telephone line and the reference terminal, and an output terminal coupled to a relay. Whenever the input terminals are supplied with a specified potential from the telephone lines, an output from the output terminal maintains the relay in a nonenergized condition so that contacts controlled by the relay couple a DC booster power supply in series relationship with one of the telephone lines. In response to different potentials on the input terminals, the output at the output terminal energizes the relay such that the contacts insert the DC booster power supply in series relationship with the other telephone line. The DC booster power supply has a current sensor such that the booster DC potential is only supplied to the telephone lines when DC current is present on the telephone lines. In addition, the DC booster power supply has a current limiter limiting the amount of DC current on the telephone lines.

    Abstract translation: 环路扩展器与从电话中心局延伸到用户位置的一对电话线一起使用，以便在电话线路上插入增强型DC电位，以便有助于在电话中心产生的DC电流的流动 电话线由电话中心局电池。 控制电路具有耦合到电话线中的一个和参考终端的一个输入端，耦合到另一个电话线和参考终端的另一输入端以及耦合到继电器的输出端。 每当从电话线向输入端子提供指定的电位时，输出端子的输出将继电器维持在非通电状态，使得由继电器控制的触点将一个直流增压器电源与一条电话线串联 。 响应于输入端子上的不同电位，输出端子的输出使继电器通电，使得触点将DC增压器电源与另一条电话线串联。 直流增压器电源具有电流传感器，使得当直流电流存在于电话线上时，升压器直流电势仅被提供给电话线路。 此外，直流增压电源具有限制电话线路上的直流电流量的电流限制器。

    Relay range extender for telephone systems
    30.
    发明授权
    Relay range extender for telephone systems 失效
    电话系统的继电器范围扩展器

    公开(公告)号：US3889066A

    公开(公告)日：1975-06-10

    申请号：US40578773

    申请日：1973-10-12

    Applicant: SUPERIOR CONTINENTAL CORP

    Inventor： SIMOKAT FRANK L ,  GREENE CLIFFORD E

    IPC: H04M7/04 ,  H04M19/00 ,  H04M1/76

    CPC classification number: H04M19/006

    Abstract: A telephone transmission circuit in which a relay range extender has a balanced two-winding relay and a range-extending resistor, in which the relay windings are respectively connected to and in series with the conductors of a two-conductor telephone transmission line, in which the relay is operative to electrically connect the range-extending resistor in series with current-operated central office line equipment and in parallel with the circuit loop containing the transmission line conductors and a subscriber''s telephone.

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