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1. 发明授权

US4827505A Subscriber line interface circuit 失效
标题翻译：用户线接口电路
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
IPC分类号： H04Q1/28 , H04M19/00 , H04M3/22
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。

2. 发明授权

US4995111A Ring trip circuit for subscriber telephone 失效
标题翻译：用户电话的环路跳闸电路
公开(公告)号：US4995111A
公开(公告)日：1991-02-19
申请号：US320297
申请日：1989-02-21
申请人： Toshiro Tojo , Kenji Takato , Kazumi Kinoshita , Yuzo Yamamoto , Yozo Iketani , Shin-ichi Ito
发明人： Toshiro Tojo , Kenji Takato , Kazumi Kinoshita , Yuzo Yamamoto , Yozo Iketani , Shin-ichi Ito
IPC分类号： H04M19/02
CPC分类号： H04M19/026
摘要： An improved ring trip circuit for a subscriber telephone, for detecting an on-hook state or an off-hook state of the telephone. The ring trip circuit can be formed in a small size and can be formed by a LSI. The ring trip circuit includes a voltage detecting circuit (2), for detecting a voltage difference (.DELTA.V) between both ends of a ringer sending resistor, having a first circuit (S1, S2, A1.about.B3) converting the voltage difference to a current difference, and further having a second circuit (F) converting the current difference to a voltage, the voltage difference varying in response to the on-hook state or the off-hook state of the telephone, and a state detecting circuit (3) for detecting the on-hook state or the off-hook state in response to a value of the voltage from the voltage detecting circuit. The voltage detecting circuit is formed by a plurality of current mirror circuits, each of which includes at least two transistors. The state detecting circuit includes a comparator circuit (CP1) formed by a plurality of transistors.
摘要翻译： PCT No.PCT / JP88 / 00607 Sec。 371日期1989年2月21日 102（e）日期1989年2月21日PCT Filed 1988年6月18日PCT Pub。出版物WO88 / 10542 日期为1988年12月29日。一种用于用户电话的改进的环路跳闸电路，用于检测电话的挂机状态或摘机状态。环形跳闸电路可以形成为小尺寸并且可以由LSI形成。环路跳闸电路包括电压检测电路（2），用于检测振铃发送电阻器两端之间的电压差（DELTA V），该电路具有将电压差转换为a的第一电路（S1，S2，A1差分B3）并且还具有将电流差转换为电压的第二电路（F），所述电压差响应于电话的挂机状态或摘机状态而变化，以及状态检测电路（3）用于响应于来自电压检测电路的电压的值来检测挂机状态或摘机状态。电压检测电路由多个电流镜电路形成，每个电流镜电路包括至少两个晶体管。状态检测电路包括由多个晶体管形成的比较器电路（CP1）。

3. 发明授权

US5311518A ISDN interface circuit and system using the same 失效
标题翻译： ISDN接口电路和系统使用相同
公开(公告)号：US5311518A
公开(公告)日：1994-05-10
申请号：US684272
申请日：1991-04-12
申请人： Kenji Takato , Yozo Iketani , Takashi Sato , Hiroyuki Ujiie , Seiji Miyoshi
发明人： Kenji Takato , Yozo Iketani , Takashi Sato , Hiroyuki Ujiie , Seiji Miyoshi
IPC分类号： H04M19/00 , H04Q5/00 , H04Q11/04 , H04J3/12
CPC分类号： H04M19/005 , H04Q11/0471 , H04Q2213/08
摘要： An ISDN interface circuit is provided which is coupled to a terminal device via a transmission line and a reception line, the transmission line being formed of a pair of first and second wires, and the reception line being formed of a pair of third and fourth wires. The ISDN interface circuit includes a first resistor and a second resistor connected in series at a first node and between the first and second wires of the transmission line, and a third resistor and a fourth resistor connected in series at a second node and between the third and fourth wires of the reception line. The ISDN interface circuit also includes a D.C. power source connected to one of the first node, at which the first resistor and the second resistor are mutually connected in series and the second node, at which the third resistor and the fourth resistor are mutually connected in series. One of the first node and the second node, other than the above-mentioned one of the first node and the second node connected to the D.C. power source, is grounded.
摘要翻译：提供了一种ISDN接口电路，其经由传输线和接收线耦合到终端设备，所述传输线由一对第一和第二布线形成，并且所述接收线由一对第三和第四布线。 ISDN接口电路包括第一电阻器和第二电阻器，第一电阻器和第二电阻器在第一节点处串联连接在传输线路的第一和第二导线之间，第三电阻器和第四电阻器在第二节点处串联连接，和接收线的第四根线。 ISDN接口电路还包括连接到第一节点之一的DC电源，第一节点与第一电阻器和第二电阻器串联相互连接，第二节点在第二节点处连接第三电阻器和第四电阻器系列。除了连接到直流电源的第一节点和第二节点之一之外，第一节点和第二节点之一是接地的。

4. 发明授权

US4982422A Terminating circuit in a battery feed circuit of an electronic exchange system 失效
标题翻译：电子交换系统的电池供电电路中的终端电路
公开(公告)号：US4982422A
公开(公告)日：1991-01-01
申请号：US409064
申请日：1989-09-19
申请人： Shin-ichi Itoh , Kenji Takato , Yozo Iketani , Yuzo Yamamoto
发明人： Shin-ichi Itoh , Kenji Takato , Yozo Iketani , Yuzo Yamamoto
IPC分类号： H04M19/00 , H04Q3/42
CPC分类号： H04M19/005
摘要： Disclosed is a terminating circuit in a battery feed circuit of an electronic exchange system. The battery feed circuit comprises two transconductance amplifiers connected by a coupling capacitor, for supplying a direct current through a ring terminal and a tip terminal to a load. Each of the transconductance amplifiers comprises an operational amplifier; a resistor connected between the output end of the operational amplifier and the tip terminal or the ring terminal, and an impedance unit connected between the inverting input terminal of the operational amplifier and the output end. The impedance unit has an impedance determined in such a way that the required terminating impedance of the battery feed circuit when viewed from the tip terminal and the ring terminal is formed only by the internal elements including the impedance means and the resistor, whereby an external larger-size capacitance capacitor for matching becomes unnecessary.

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