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    Party line telephone system
    1.
    发明授权
    Party line telephone system 失效
    党线电话系统

    公开(公告)号：US4258230A

    公开(公告)日：1981-03-24

    申请号：US48911

    申请日：1979-06-15

    申请人： Herbert Heller ,  Paul W. Schmitt

    发明人： Herbert Heller ,  Paul W. Schmitt

    IPC分类号： H04Q5/02 ,  H04M9/02

    CPC分类号： H04Q5/02

    摘要： A party line telephone system capable of effecting selective calling from one station to another and particularly adapted for use in battery-powered two-wire telephone systems such as those used in underground mines where consideration of intrinsic safety, low power consumption and compatibility with existing equipment are paramount. The system of the invention is such that the receiver at each station in the network need not be connected to a battery-powered source for any prolonged period of time except when that station is being called by another station for a private conversation, thereby conserving battery power.

    摘要翻译： 一种能够从一个站点进行选择性呼叫到另一个站点的专用电话系统，特别适用于电池供电的二线电话系统，例如在地下矿井中使用的电话系统，其中考虑到本质安全性，低功耗和与现有设备的兼容性 是至高无上的 本发明的系统使得网络中的每个站点处的接收机不需要连续延长任何电池供电的时间段，除非该站被另一个站点用于私人会话，从而节省电池 功率。

    Telephone ringing detectors
    2.
    发明授权
    Telephone ringing detectors 失效
    电话铃声探测器

    公开(公告)号：US4056694A

    公开(公告)日：1977-11-01

    申请号：US724381

    申请日：1976-09-17

    申请人： Stephen Joseph Brolin

    发明人： Stephen Joseph Brolin

    IPC分类号： H04Q5/02 ,  H04M1/26

    CPC分类号： H04Q5/02

    摘要： A telephone ringing signal detector is disclosed for detecting four-party fully selective superimposed ringing signals on a telephone line. Detecting these signals at the central office end of a subscriber loop carrier system permits encoding the ringing signals for transmission on the carrier system and subsequent decoding and utilization at a remote carrier terminal to control the regeneration of selective ringing signals.The ringing detector includes separate 20 Hz alternating current signal detectors for each conductor of the telephone pair and further includes separate polarity detector for each conductor. The polarity signals for the two conductors are gated by the outputs of the respective 20 Hz signals and combined in a single polarity indication applicable for either conductor. False signaling indications are thereby prevented in the presence of central office variations of amplitude, waveform and level of the dc signals, as well as variations in the phase of the ringing signals.

    摘要翻译： 公开了一种电话振铃信号检测器，用于在电话线路上检测四方完全选择性叠加振铃信号。 在用户环路载波系统的中央局端检测这些信号允许对振铃信号进行编码以在载波系统上进行传输，并且在远程载波终端处随后进行解码和利用以控制选择性振铃信号的再生。

    Automatic disconnect circuit for reducing dial pulse distortion caused by subscriber carrier equipment
    3.
    发明授权
    Automatic disconnect circuit for reducing dial pulse distortion caused by subscriber carrier equipment 失效
    自动断开电路，用于减少由订户运输设备引起的拨号错误

    公开(公告)号：US3780228A

    公开(公告)日：1973-12-18

    申请号：US3780228D

    申请日：1972-03-01

    申请人： GTE AUTOMATIC ELECTRIC LAB INC

    发明人： STEWART J

    IPC分类号： H04M19/08 ,  H04Q5/02 ,  H04H1/08

    CPC分类号： H04Q5/02 ,  H04M19/08

    摘要： A local subscriber battery is connected through a battery charging circuit, a disconnect circuit, and a cable pair to a central office talking battery. The disconnect circuit includes a pair of transistor switches that are connected in series between associated lines of the cable pair and the charging circuit for selectively blocking line current to the latter at the start of a dial pulse; a first resistor-capacitor network for detecting initiation of a dial pulse; and a second resistor-capacitor network for controlling the operation of the switches. The second network is responsive to operation of the first network for holding the switches open to prevent charging current flowing on the cable pair for a prescribed time interval after detection of the leading edge of a dial pulse. This ensures that the contacts of the A-pulsing relay in the central office drop out in response to the dial pulse.

    摘要翻译： 本地用户电池通过电池充电电路，断开电路和电缆对连接到中心局通话电池。 断开电路包括一对晶体管开关，其串联连接在电缆对的相关线路和充电电路之间，用于在拨号脉冲开始时选择性地阻断线路电流; 用于检测拨号脉冲的启动的第一电阻 - 电容网络; 以及用于控制开关的操作的第二电阻 - 电容器网络。 第二网络响应于第一网络的操作，以便在检测到拨号脉冲的前沿之后的规定时间间隔内保持开关保持开路以防止在电缆对上流动的充电电流。 这确保了中心局的A脉冲继电器的触点响应于拨号脉冲而退出。