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1.发明授权
公开(公告)号：US4682356A
公开(公告)日：1987-07-21
申请号：US627243
申请日：1984-07-02
摘要： A transformerless hybrid circuit arrangement for a subscriber line interface circuit of a telecommunications exchange is disclosed. A preferred embodiment of the hybrid arrangement comprises a first and a second operational amplifier plus a differential amplifier connected together in the following manner: The non-inverting input of the first operational amplifier is connected to a first reference voltage and the output of this amplifier is connected (1) via a first resistor to one wire of the two-wire subscriber line, and (2) via a third resistor to the inverting input of the amplifier. The non-inverting input of the second operational amplifier is connected to a second reference voltage and to the receiving branch of the four-wire line of the telecommunications exchange. The output of this second operational amplifier is connected via a second resistor to the other wire of the two-wire subscriber line, via a fourth resistor to the inverting input thereof and via a fifth resistor to the inverting input of the first operational amplifier. Each of the two inputs of the differential amplifier are connected, via respective resistors, to one wire of the two-wire subscriber line and to the output of that operational amplifier which is connected to the other wire of the two-wire subscriber line. The output of the differential amplifier is connected to the transmitting branch of the four-wire line of the exchange.
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2.发明授权Apparatus for transmitting and/or receiving balanced signals on a two-wire telecommunication line 失效用于在双线电信线路上发送和/或接收平衡信号的装置
公开(公告)号：US4485277A
公开(公告)日：1984-11-27
申请号：US350028
申请日：1982-02-18
IPC分类号： H04B1/58
摘要： A transformerless hybrid circuit arrangement for a subscriber line interface circuit of a telecommunications exchange is disclosed. A preferred embodiment of the hybrid arrangement comprises a first and a second operational amplifier plus a differential amplifier connected together in the following manner: The non-inverting input of the first operational amplifier is connected to a first reference voltage and the output of this amplifier is connected (1) via a first resistor to one wire of the two-wire subscriber line, and (2) via a third resistor to the inverting input of the amplifier. The non-inverting input of the second operational amplifier is connected to a second reference voltage and to the receiving branch of the four-wire line of the telecommunications exchange. The output of this second operational amplifier is connected via a second resistor to the other wire of the two-wire subscriber line, via a fourth resistor to the inverting input thereof and via a fifth resistor to the inverting input of the first operational amplifier. Each of the two inputs of the differential amplifier are connected, via respective resistors, to one wire of the two-wire subscriber line and to the output of that operational amplifier which is connected to the other wire of the two-wire subscriber line. The output of the differential amplifier is connected to the transmitting branch of the four-wire line of the exchange.
摘要翻译： 公开了一种用于电信交换机的用户线路接口电路的无变压器混合电路装置。 混合装置的优选实施例包括第一和第二运算放大器加上以下列方式连接在一起的差分放大器：第一运算放大器的非反相输入端连接到第一参考电压，该放大器的输出为 通过第一电阻连接（1）到两线用户线的一条线，以及（2）经由第三电阻器连接到放大器的反相输入端。 第二运算放大器的非反相输入端连接到第二参考电压并连接到电信交换机的四线线路的接收分支。 该第二运算放大器的输出经由第二电阻器连接到双线用户线路的另一线，经由第四电阻器连接到其反相输入，并且经由第五电阻器连接到第一运算放大器的反相输入端。 差分放大器的两个输入中的每一个通过相应的电阻器连接到两线用户线路的一条线路和连接到两线用户线路的另一条线路的该运算放大器的输出端。 差分放大器的输出端连接到交换机的四线制线路的发送支路。
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3.发明授权Apparatus for transmitting and/or receiving balanced signals on a two-wire telecommunication line 失效用于在双线电信线路上发送和/或接收平衡信号的装置
公开(公告)号：US4897871A
公开(公告)日：1990-01-30
申请号：US031336
申请日：1987-03-26
IPC分类号： H04B1/58
摘要： A transformerless hybrid circuit arrangement for a subscriber line interface circuit of a telecommunications exchange is disclosed. A preferred embodiment of the hybrid arrangement comprises a first and a second operational amplifier plus a differential amplifier connected together in the following manner: The non-inverting input of the first operational amplifier is connected to a first reference voltage and the output of this amplifier is connected (1) via a first resistor to one wire of the two-wire subscriber line, and (2) via a third resistor to the inverting input of the amplifier. The non-inverting input of the second operational amplifier is connected to a second reference voltage and to the receiving branch of the four-wire line of the telecommunications exchange. The output of this second operational amplifier is connected via a second resistor to the other wire of the two-wire subscriber line, via a fourth resistor to the inverting input thereof and via a fifth resistor to the inverting input of the first operational amplifier. Each of the two inputs of the differential amplifier are connected, via respective resistors, to one wire of the two-wire subscriber line and to the output of that operational amplifier which is connected to the other wire of the two-wire subscriber line. The output of the differential amplifier is connected to the transmitting branch of the four-wire line of the exchange.
摘要翻译： 公开了一种用于电信交换机的用户线路接口电路的无变压器混合电路装置。 混合装置的优选实施例包括第一和第二运算放大器加上以下列方式连接在一起的差分放大器：第一运算放大器的非反相输入端连接到第一参考电压，该放大器的输出为 通过第一电阻连接（1）到两线用户线的一条线，以及（2）经由第三电阻器连接到放大器的反相输入端。 第二运算放大器的非反相输入端连接到第二参考电压并连接到电信交换机的四线线路的接收分支。 该第二运算放大器的输出经由第二电阻器连接到双线用户线路的另一线，经由第四电阻器连接到其反相输入，并且经由第五电阻器连接到第一运算放大器的反相输入端。 差分放大器的两个输入中的每一个通过相应的电阻器连接到两线用户线路的一条线路和连接到两线用户线路的另一条线路的该运算放大器的输出端。 差分放大器的输出端连接到交换机的四线制线路的发送支路。
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公开(公告)号：US4396805A
公开(公告)日：1983-08-02
申请号：US303821
申请日：1981-09-21
申请人： Theodore W. Wagner
发明人： Theodore W. Wagner
CPC分类号： H04M19/026
摘要： A ring trip detector for a subscriber line interface circuit which couples a two-wire subscriber line with the transmitting and receiving branches, respectively, of a four-wire line in a telecommunication exchange. The subscriber line interface circuit includes a two-to-four wire hybrid circuit having an off-hook detector; a ring generator for producing an AC ring voltage of given frequency for ringing a subscriber set connected to the subscriber line; and a ring relay for selectively connecting the hybrid circuit to the subscriber line when in a first position and connecting the ring generator to the subscriber line when in a second position. The ring trip detector includes a first circuit, which receives a first signal representing the off-hook condition of the subscriber set and a second signal that is synchronized with zero crossings of said ring voltage, for producing a synchronized off-hook signal at the next, subsequent zero crossing of the ring voltage after said first signal indicates the presence of the off-hook condition; and a second circuit, which receives the synchronized off-hook signal, for switching the relay to its first position.
摘要翻译： 一种用于线路接口电路的环路跳闸检测器，其将两线用户线路分别与电信交换机中的四线路线的发送和接收分支耦合。 用户线接口电路包括具有摘机检测器的二对四线混合电路; 环形发生器，用于产生给定频率的交流环电压，用于振铃连接到所述用户线路的用户设备; 以及环形继电器，用于在处于第一位置时选择性地将混合电路连接到用户线路，并且当处于第二位置时将环形发生器连接到用户线路。 环路跳闸检测器包括第一电路，其接收表示用户组的摘机状态的第一信号和与所述环形电压的过零点同步的第二信号，以产生下一个同步摘机信号 在所述第一信号之后的所述环形电压的随后过零点指示是否存在摘机状态; 以及第二电路，其接收同步摘机信号，用于将继电器切换到其第一位置。
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公开(公告)号：US4375584A
公开(公告)日：1983-03-01
申请号：US194622
申请日：1980-10-06
IPC分类号： H04M1/02
CPC分类号： H04M1/0289
摘要： A modular telephone keyset instrument is arranged within a rectangular casing having indentations in the top for receiving a telephone handset. Electrical (electronic) circuits are provided on a mother PC board, a daughter PC board and a key switch PC board, stacked within the housing from bottom to top, respectively. The daughter and keyset PC boards are connected to the mother PC board by ribbon cables. A hook switch, mounted on and attached to the daughter PC board extends through one of the indentations in the top to sense whether the telephone handset is placed in the indentations.
摘要翻译： 模块化电话键盘设备被布置在矩形外壳内，在顶部具有凹痕以接收电话听筒。 电子（电子）电路分别设置在母板PC，子PC板和键盘PC板上，分别从底部到顶部堆叠在外壳内。 女儿和键盘PC板通过带状电缆连接到母板。 安装在子PC板上并连接到子PC板上的挂钩开关延伸穿过顶部的凹槽中的一个，以感测电话手机是否放置在凹槽中。
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公开(公告)号：US4389544A
公开(公告)日：1983-06-21
申请号：US249400
申请日：1981-03-31
摘要： Digital telephone apparatus suitable for use as a subscriber station as well as for an attendant console. The telephone apparatus is connectable for full duplex communication with a four wire telephone transmission line. The telephone apparatus is capable of transmitting PCM speech data and/or digital data from a digital data interface to a peripheral data system. The telephone apparatus comprises an internal data bus to which are connected a digital transceiver, a sync/signalling generator, a serial frame synchronizer and at least one codec/PCM filter. The transceiver transmits and receives digital data to and from the telephone transmission line. The sync/signalling generator repeatedly supplies an 8 bit first data word to the internal data bus containing a binary synchronizing code and a signalling code. Simultaneously, the serial frame synchronizer repeatedly receives from the data bus and decodes an 8 bit first data word containing a synchronizing code and a signalling code. The codec/PCM filter repeatedly receives from and transmits to said internal data bus 8 bit PCM voice samples as additional data words immediately following the first data word. A microcomputer, including a number of input/output devices, receives successive signalling codes from the serial frame synchronizer and repeatedly transmits signalling codes to the sync/signalling generator for communicating with the telephone exchange to which the apparatus is connected.
摘要翻译： 数字电话设备适合用作用户台以及话务台。 电话设备可连接四线电话传输线进行全双工通信。 电话设备能够将PCM语音数据和/或数字数据从数字数据接口传送到外围数据系统。 电话设备包括连接数字收发器，同步信号发生器，串行帧同步器和至少一个编解码器/ PCM滤波器的内部数据总线。 收发器向和从电话传输线路发送和接收数字数据。 同步/信令发生器重复地将8位第一数据字提供到包含二进制同步码和信令码的内部数据总线。 同时，串行帧同步器从数据总线反复接收并解码包含同步码和信令码的8位第一数据字。 编解码器/ PCM滤波器重复接收并发送到所述内部数据总线8位PCM语音样本作为紧跟在第一数据字之后的附加数据字。 包括多个输入/输出设备的微型计算机从串行帧同步器接收连续的信令代码，并重复发送信号代码给同步信号发生器，以便与设备所连接的电话交换机进行通信。
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