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    • 3. 发明授权
    • Multi-stage switching network controlled by at least three logical inputs
    • 由至少三个逻辑输入控制的多级交换网络
    • US4264895A
    • 1981-04-28
    • US16824
    • 1979-03-02
    • Takuji MukaemachiTetsuo TakeshitaKeiichi ShimizuRyoichi Himeno
    • Takuji MukaemachiTetsuo TakeshitaKeiichi ShimizuRyoichi Himeno
    • H04Q3/52H04Q9/00
    • H04Q3/521
    • A multi-stage switching network comprises a plurality of unitary switch matrices each including a number of cross-point circuits each of which in turn includes a memory circuit operatively connected to the associated cross-point switches in a speech path. The plurality of the unitary switch matrices are arranged in a matrix array in which each stage of the multi-stage switching network is constituted by the unitary switch matrices arrayed in at least one column thereof and interconnected through links. The memory circuit for performing ON/OFF control of the associated cross-point switches in each of the switch matrices incorporates therein at least three logical control signal input terminals to which at least an information signal for designating the switch matrix to be selected and information signals for designating a row and a column in the selected switch matrix are applied, the latter information signals being produced in common to all the switch matrices, whereby a given cross-point determined by these information signals in the selected matrix is selected and correspondingly controlled. The ON/OFF control of the cross-point switch is effected sequentially by a stage selecting information signal from stage to stage.
    • 多级交换网络包括多个单位开关矩阵,每个开关矩阵包括多个交叉点电路,每个交叉点电路又包括可操作地连接到语音路径中的相关联的交叉点开关的存储器电路。 多个单位开关矩阵被排列成矩阵阵列,其中多级交换网络的每一级由排列在其至少一列中的并通过链路互连的整体开关矩阵构成。 用于对每个开关矩阵中的相关联的交叉点开关进行ON / OFF控制的存储电路在其中包括至少三个逻辑控制信号输入端,至少一个用于指定要选择的开关矩阵的信息信号和信息信号 用于指定所选开关矩阵中的行和列,后一信息信号被共同产生到所有开关矩阵中,由此选择由所选择的矩阵中的这些信息信号确定的给定交叉点并对其进行控制。 交叉点开关的ON / OFF控制由阶段选择信息信号顺序地进行。
    • 7. 发明授权
    • Current supplying circuit with shorted-to-ground fault detecting function
    • 电流供电电路具有短路对地故障检测功能
    • US4385336A
    • 1983-05-24
    • US213010
    • 1980-12-04
    • Tetsuo TakeshitaJunjiro KitanoKoichi Hagishima
    • Tetsuo TakeshitaJunjiro KitanoKoichi Hagishima
    • H02H9/02H04M3/30H04M19/00H02H9/08H04M3/08
    • H04M3/30H04M19/001
    • This invention relates to a current supplying circuit for supplying a current to a terminal apparatus through a ring line and a tip line which are connected through resistance elements to a potential source and ground, respectively. This current supplying circuit includes respective detectors for generating first and second detection signals of amplitudes proportional to the currents flowing in the ring and tip lines, respectively, a circuit for generating a reference signal, and a comparator for comparing the signal difference between the first and second detection signals and the reference signal so as to produce a signal in accordance with the compared result, thus a shorted-to-ground fault on the ring line or tip line being detected by monitoring the signal produced in accordance with the compared result. After the shorted-to-ground fault is detected, the current supplying circuit is protected from breakdown.
    • 本发明涉及一种电流供应电路,用于通过环形线路和尖端线路向终端设备提供电流,该电流线路分别通过电阻元件连接到电位源和接地。 该电流供给电路包括各自的检测器,用于分别产生与在环路和尖端线路中流动的电流成比例的振幅的第一和第二检测信号,用于产生参考信号的电路,以及比较器,用于比较第一和第 第二检测信号和参考信号,以根据比较结果产生信号,从而通过监视根据比较结果产生的信号来检测环形线或尖端线上的短路对地故障。 在检测到短路对地故障之后,保护电流供应电路不受破坏。