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公开(公告)号：US4748659A
公开(公告)日：1988-05-31
申请号：US904495
申请日：1986-09-08
申请人： Kiyoshi Kasahara , Kenichi Ogawa , Kenji Takato , Shoji Nojiri , Yoshimi Iijima , Yasuo Miyazaki , Mitsutoshi Ayano , Kiyoshi Shibuya , Atsuo Serikawa
发明人： Kiyoshi Kasahara , Kenichi Ogawa , Kenji Takato , Shoji Nojiri , Yoshimi Iijima , Yasuo Miyazaki , Mitsutoshi Ayano , Kiyoshi Shibuya , Atsuo Serikawa
IPC分类号： H04M19/02
CPC分类号： H04M19/026
摘要： In a calling signal transmitting apparatus, a ring trip equipment, including a ring trip detecting circuit for detecting a ring trip signal in response to an off-hook operation of the telephone set during a signal state of an intermittent ringing signal and a loop detecting circuit for detecting a loop signal in response to an off-hook operation of the telephone set during a nonsignal state of the intermittent ringing signal. Also included are a logical OR gate circuit, for providing, as a status signal, a logical sum of the ring trip signal and the loop signal, and a supervising circuit for supervising the status signal. When an incoming call is being received by the telephone set, when the supervising circuit detects an off-hook state in the status signal, the supervising circuit stops the transmission of a ringing signal to the telephone set, and carries out a second supervising operation for supervising the status signal, and, if an on-hook state is detected during the second supervising operation, said supervising circuit again transfers the ringing signal to the telephone set.
摘要翻译： 在呼叫信号发送装置中，环路跳闸设备包括环路跳闸检测电路，用于在间歇振铃信号的信号状态期间响应于电话机的摘机操作来检测环路跳闸信号，以及环路检测电路 用于在间歇振铃信号的非信号状态期间响应于电话机的摘机操作来检测回路信号。 还包括逻辑或门电路，用于提供环路跳闸信号和环路信号的逻辑和作为状态信号，以及用于监视状态信号的监控电路。 当电话机接收到来电时，当监控电路在状态信号中检测到摘机状态时，监控电路停止向电话机发送振铃信号，并执行第二监视操作 监视状态信号，并且如果在第二监视操作期间检测到挂机状态，则所述监控电路再次将振铃信号传送到电话机。
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公开(公告)号：US4631366A
公开(公告)日：1986-12-23
申请号：US736345
申请日：1985-05-21
IPC分类号： H04M19/00
CPC分类号： H04M19/005
摘要： A battery feed circuit for a subscriber line includes first and second feed circuit parts, each supplying a constant current to a corresponding subscriber line. The first and second feed circuit parts are provided with at least one of a common mode noise suppressor and a power source noise suppressor. The common mode noise suppressor includes first and second reference voltage output circuits and an intermediate voltage output circuit to produce the voltage between the first and second subscriber lines and superpose the same onto the first and second reference voltages. The power source noise suppressor functions to cancel the power source noise voltage at the output, of the first and second feed circuit parts.
摘要翻译： 用于用户线路的电池馈电电路包括第一和第二馈电电路部分，每个馈电电路部分向相应的用户线路提供恒定电流。 第一和第二馈电电路部分设置有共模噪声抑制器和电源噪声抑制器中的至少一个。 共模噪声抑制器包括第一和第二参考电压输出电路和中间电压输出电路，以产生第一和第二用户线之间的电压并将其叠加到第一和第二参考电压上。 电源噪声抑制器用于消除第一和第二馈电电路部分的输出端的电源噪声电压。
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公开(公告)号：US4827505A
公开(公告)日：1989-05-02
申请号：US897914
申请日：1986-08-19
申请人： Kenji Takato , Toshiro Tojo , Yozo Iketani , Mitsutoshi Ayano , Kiyoshi Shibuya
发明人： Kenji Takato , Toshiro Tojo , Yozo Iketani , Mitsutoshi Ayano , Kiyoshi Shibuya
CPC分类号： H04M19/005
摘要： A subscriber line interface circuit receives and twice inverts currents from a 2-wire subscriber line and returns the currents to the subscriber line so longitudinal input impedance is low. Any differential input current in the subscriber lines is bypassed by a capacitor, so differential input impedance is very high. The circuit also sends a signal current from one system having one ground to another system having a different ground through one current path, while sending another current, having a phase opposite and amplitude equal to the signal current, through another path. This effectively isolates the two systems having different grounds.
摘要翻译： 用户线路接口电路接收来自2线用户线的两次反相电流，并将电流返回给用户线，因此纵向输入阻抗较低。 用户线路中的任何差分输入电流都被电容器旁路，因此差分输入阻抗非常高。 该电路还通过一个电流通路将具有一个地的一个系统的信号电流发送到另一个具有不同接地的系统，同时通过另一路径发送具有与信号电流相反的幅度的另一个电流。 这有效地隔离了具有不同理由的两个系统。
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公开(公告)号：US4677669A
公开(公告)日：1987-06-30
申请号：US737165
申请日：1985-05-23
CPC分类号： H04M19/005
摘要： Battery feed circuit for a pair of subscriber lines includes a voltage drive circuit with an operational amplifier having a predetermined output impedance determined by an alternating current terminal impedance for the pair of subscriber lines. Both voice signals and induced noise signals are terminated by the voltage drive circuit. The voltage drive circuit is connected in parallel with an electronic inductance circuit, between one of the subscriber lines and ground or a direct current voltage supply.
摘要翻译： 用于一对用户线路的电池馈电电路包括具有由用于该用户线的交流端子阻抗确定的预定输出阻抗的运算放大器的电压驱动电路。 语音信号和感应噪声信号均由电压驱动电路终止。 电压驱动电路与电子电感电路并联连接，其中一个用户线路与接地线之间或直流电压源。
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公开(公告)号：US4588860A
公开(公告)日：1986-05-13
申请号：US566476
申请日：1983-12-28
IPC分类号： H04M19/00
CPC分类号： H04M19/008 , H04M19/001
摘要： A battery feed circuit for a two-wire telephone subscriber line is miniaturized by an electronic integrated circuit without a transformer. The electronic battery feed circuit is composed of first and second operational amplifiers, output resistors, a DC voltage feedback loop, an AC signal feedback loop and a switching power supply. The switching power supply means is to control the power source voltage of the first operational amplifier, corresponding to the length of the subscriber line loop and the status of a telephone set in the loop. Low power consumption of the circuit is attained as follows. Most of power loss of the circuit can be separated as between the amplifiers and the output resistors. The loss of the output resistors are reduced by using small resistances, and the loss of the second amplifier is reduced by using a small DC bias. The loss of the first amplifier is reduced by setting its power source voltage to several volts lower than output voltage of the switching power supply. The switching power supply is composed of a zener diode, two comparators and a switching transistor circuit.
摘要翻译： 用于双线电话用户线的电池馈电电路由没有变压器的电子集成电路小型化。 电子电池馈电电路由第一和第二运算放大器，输出电阻器，直流电压反馈回路，交流信号反馈回路和开关电源组成。 开关电源装置用于控制第一运算放大器的电源电压，对应于用户线环路的长度和电路在环路中的状态。 电路的低功耗如下。 电路的大多数功率损耗可以在放大器和输出电阻之间分开。 通过使用小电阻来减小输出电阻的损耗，并且通过使用小的直流偏压来减小第二放大器的损耗。 通过将其电源电压设置为比开关电源的输出电压低几伏来降低第一放大器的损耗。 开关电源由齐纳二极管，两个比较器和开关晶体管电路组成。
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公开(公告)号：US4175218A
公开(公告)日：1979-11-20
申请号：US907197
申请日：1978-05-18
申请人： Mitsutoshi Ayano , Eiji Minamitani
发明人： Mitsutoshi Ayano , Eiji Minamitani
摘要： In the case where a two-wire circuit forming a trunk or a subscriber line of the two-wire system is converted by a hybrid circuit to a four-wire circuit of sending and receiving paths to form a transmission line between subscribers, if an impedance variation on the two-wire side is large, a leak from sending path to receiving path occurs and is amplified to cause singing. To eliminate the singing, a circuit for detecting the impedance fluctuation of the two-wire side is inserted in the two-wire circuit, and switching means inserted in the four-wire circuit is activated by an impedance detecting signal of the detecting circuit to electrically open the four-wire circuit, thereby preventing the singing phenomena. This method does not involve the use of an expensive attenuator which is troublesome to design for the prevention of singing.
摘要翻译： 在形成双线系统的中继线或用户线的双线电路由混合电路转换成发送和接收路径的四线电路以在用户之间形成传输线的情况下，如果阻抗 双线侧的变化大，从发送路径到接收路径的泄漏发生并被放大，导致唱歌。 为了消除唱歌，用于检测双线侧的阻抗波动的电路被插入到双线电路中，插入在四线电路中的开关装置由检测电路的阻抗检测信号激活，以电 打开四线电路，从而防止唱歌现象。 该方法不涉及使用昂贵的衰减器，这对于防止唱歌而设计是麻烦的。
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