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    Fail safe voice system for integrated services for digital network subscribers
    5.
    发明授权
    Fail safe voice system for integrated services for digital network subscribers 失效
    用于数字网络用户综合业务的故障安全语音系统

    公开(公告)号：US4853949A

    公开(公告)日：1989-08-01

    申请号：US173228

    申请日：1988-03-24

    申请人： Ian A. Schorr ,  Gregory P. Pucci ,  John P. Dorth ,  Bruce R. Miller

    发明人： Ian A. Schorr ,  Gregory P. Pucci ,  John P. Dorth ,  Bruce R. Miller

    IPC分类号： H04Q11/04

    CPC分类号： H04Q11/0428

    摘要： A fail safe voice system and method for digital telephone networks. The system provides for operation of voice telephone equipment at a customer location when a fault occurs at the customer location. The system has a central office with an analog line termination/digital transceiver connected to subscriber loop lines. The customer location has a digital transceiver/analog station set interface connected to the subscriber loop lines and to the voice telephone equipment. In response to a fault at the customer location the voice telephone equipment is connected directly to the subscriber loop lines thereby eliminating the digital transceiver/analog station set interface.

    摘要翻译： 一种用于数字电话网络的故障安全语音系统和方法。 当在客户位置发生故障时，系统提供在客户位置处的语音电话设备的操作。 该系统具有连接到用户环路线的模拟线路终端/数字收发器的中心局。 客户位置具有连接到用户回路线和语音电话设备的数字收发器/模拟站设置接口。 响应于客户位置处的故障，语音电话设备直接连接到用户环路线，从而消除数字收发器/模拟站设置接口。

    Remote terminal channel unit for telephone transmission lines
    6.
    发明授权
    Remote terminal channel unit for telephone transmission lines 失效
    用于电话传输线的远程终端通道单元

    公开(公告)号：US5422950A

    公开(公告)日：1995-06-06

    申请号：US282426

    申请日：1994-07-28

    申请人： Bruce R. Miller ,  Frank X. Garcia

    发明人： Bruce R. Miller ,  Frank X. Garcia

    IPC分类号： H04B1/58 ,  H04M3/40 ,  H04M7/04

    CPC分类号： H04B1/585 ,  H04M3/40

    摘要： An automatic loss compensation for use in a two to four wire hybrid converter in a telephone system. Many hybrid converters provide a substantially fixed gain for receive signals that are provided to the customer loop telephone line and for transmit signals that are provided to the digital carrier transmission line. The compensation circuit includes a measurement circuit, controller, and receive and transmit amplifier. The measurement circuit determines the length of the customer loop telephone line and provides a length signal. The controller receives the length signal and categorizes the length as being within one of a plurality of segments. The controller appropriately varies the amplification and phase of the receive signal, which is then combined with an inverted transmit signal, in order to substantially reduce reflected signals from the transmission line and transmission line termination.

    摘要翻译： 一种用于电话系统中的二至四线混合转换器的自动损耗补偿。 许多混合转换器为提供给客户回路电话线的接收信号和提供给数字载波传输线的发射信号提供基本上固定的增益。 补偿电路包括测量电路，控制器和接收和发射放大器。 测量电路确定客户回路电话线的长度并提供长度信号。 控制器接收长度信号并将长度分类为多个段之一。 控制器适当地改变接收信号的放大和相位，然后将其与反相发射信号组合，以便基本上减少来自传输线和传输线终端的反射信号。

    Trans-hybrid loss compensator for on hook transmission
    9.
    发明授权
    Trans-hybrid loss compensator for on hook transmission 失效
    用于挂钩传输的跨混合损耗补偿器

    公开(公告)号：US5357569A

    公开(公告)日：1994-10-18

    申请号：US56413

    申请日：1993-05-03

    申请人： Frank X. Garcia ,  Bruce R. Miller

    发明人： Frank X. Garcia ,  Bruce R. Miller

    IPC分类号： H04M1/57 ,  H04M3/00 ,  H04M3/40 ,  H04M1/00

    CPC分类号： H04M1/573 ,  H04M3/40 ,  H04M3/002

    摘要： A two to four wire hybrid converter for use in a telephone system that allows other telephone equipment, such as a caller identification device, to more readily decipher signals. The converter controls noise by using a digital to analog converter, hybrid circuit, interface circuit, and controller. The digital to analog converter accepts a receive digital data signal from a transmission line and converts it to a receive analog signal. The hybrid circuit accepts the receive analog signal and provides it to the customer telephone line, as well as accepting a transmit telephone analog signal from the customer telephone line. Such transmit telephone analog signals are then converted to digital signals and provided to the carrier transmission lines. The hybrid circuit includes an inverter, variable amplifiers, and summing circuit. The inverter inverts the transmit telephone analog signal with respect to the receive analog signal. In the preferred embodiment, the summing circuit combines the inverted transmit and receive analog signals. A transmit variable amplifier changes the magnitude of the transmit analog signal provided to the summing circuit. A receive variable amplifier changes the magnitude of the analog signal provided to the customer telephone line. A trans-hybrid variable amplifier changes the magnitude of the receive analog signal to be combined with the inverted transmit analog signal. The controller detects whether or not the telephone has gone off hook. Upon receiving a signal that the telephone has gone off hook, the controller changes the gain of the variable amplifiers.

    摘要翻译： 一种用于电话系统中的二至四线混合转换器，其允许诸如呼叫者识别装置的其他电话设备更容易地破译信号。 该转换器通过使用数模转换器，混合电路，接口电路和控制器来控制噪声。 数模转换器接收来自传输线的接收数字数据信号，并将其转换为接收模拟信号。 混合电路接受接收模拟信号并将其提供给客户电话线，以及从客户电话线路接收发送电话模拟信号。 然后将这样的发送电话模拟信号转换成数字信号并提供给载波传输线。 混合电路包括逆变器，可变放大器和求和电路。 逆变器相对于接收模拟信号反转发射电话模拟信号。 在优选实施例中，求和电路组合反相发射和接收模拟信号。 发射可变放大器改变提供给求和电路的发射模拟信号的幅度。 接收可变放大器改变提供给客户电话线的模拟信号的幅度。 跨混合可变放大器将接收模拟信号的幅度改变为与反相发射模拟信号组合。 控制器检测电话是否脱钩。 当接收到电话摘机的信号时，控制器改变可变放大器的增益。

    Gain or loss compensation circuit for telephone lines
    10.
    发明授权
    Gain or loss compensation circuit for telephone lines 失效
    电话线的增益或损耗补偿电路

    公开(公告)号：US5347544A

    公开(公告)日：1994-09-13

    申请号：US56412

    申请日：1993-05-03

    申请人： Frank X. Garcia ,  Bruce R. Miller

    发明人： Frank X. Garcia ,  Bruce R. Miller

    IPC分类号： H04M3/40 ,  H04Q11/04 ,  H04B3/04

    CPC分类号： H04Q11/04 ,  H04M3/40

    摘要： A compensation circuit for adjusting the gain or loss of a four to two wire hybrid circuit in a telephone system automatically, regardless of the length of the telephone line interconnected to the hybrid circuit. The compensation circuit includes a converter, interface, gate array, and controller. The converter, which includes an amplifier with a variable gain, is connected to a digital carrier transmission line. The converter accepts a digital data signal and converts it to an analog intermediate signal. The interface receives the analog intermediate signal and transmits an analog telephone signal, along a customer loop telephone line, to a telephone. The interface also includes a pulse width modulated power converter for which the pulse width varies according to the length of the telephone line between the compensation circuit and the telephone. The gate array senses the pulse width and responsively provides a measured signal to the controller. The controller receives the measured signal, representing the pulse width, as well as a voltage signal, representing the voltage powering the interface, and responsively adjusts the gain or loss of the gain of the variable amplifier.

    摘要翻译： 一种用于在电话系统中自动调整四至二线混合电路的增益或损耗的补偿电路，而不管互连到混合电路的电话线的长度如何。 补偿电路包括转换器，接口，门阵列和控制器。 包括具有可变增益的放大器的转换器连接到数字载波传输线。 转换器接收数字数据信号并将其转换为模拟中间信号。 接口接收模拟中间信号，并沿着客户回路电话线将模拟电话信号发送到电话机。 该接口还包括脉冲宽度调制功率转换器，脉冲宽度根据补偿电路和电话之间的电话线的长度而变化。 门阵列检测脉冲宽度并响应于向控制器提供测量信号。 控制器接收表示脉冲宽度的测量信号，以及表示为接口供电的电压的电压信号，并且响应于调整可变放大器增益的增益或损耗。