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1. 发明授权

US4536614A Supervision and dial pulse detection circuit for a telephone subscriber line 失效
标题翻译：电话用户线路的监控和拨号脉冲检测电路
公开(公告)号：US4536614A
公开(公告)日：1985-08-20
申请号：US449030
申请日：1982-12-13
申请人： Constantine V. Skidanenko , Gregor D. McGibbon
发明人： Constantine V. Skidanenko , Gregor D. McGibbon
IPC分类号： H04M3/22 , H04M19/00 , H04Q1/32
CPC分类号： H04M19/008 , H04M3/2272 , H04Q1/32
摘要： A floating battery feed circuit employs a single primary winding, a pulse width control circuit and a peak detector for providing a controlled current to a subscriber loop. The amplitude of the controlled current is determined by the loop resistance. A comparator circuit has one input connected to the output of a peak detector via a breakdown diode. The second comparator input is connected to a reference voltage. When the voltage from the breakdown diode exceeds a predetermined value the comparator provides an 0 output to indicate an on-hook state. For a peak detector output voltage below said predetermined value, the comparator provides a +5 volt output indicating an off-hook state.
摘要翻译：浮动电池馈送电路采用单个初级绕组，脉冲宽度控制电路和峰值检测器，用于向用户环路提供受控电流。受控电流的振幅由回路电阻决定。比较器电路具有通过击穿二极管连接到峰值检测器的输出的一个输入。第二个比较器输入端连接到参考电压。当击穿二极管的电压超过预定值时，比较器提供0输出以指示挂机状态。对于峰值检测器输出电压低于所述预定值，比较器提供指示摘机状态的+5伏输出。

2. 发明授权

US4053797A Receive amplifier for PAM signals 失效
标题翻译：接收放大器用于PAM信号
公开(公告)号：US4053797A
公开(公告)日：1977-10-11
申请号：US719531
申请日：1976-09-01
申请人： Nam Tosuntikool , Gregor D. McGibbon
发明人： Nam Tosuntikool , Gregor D. McGibbon
IPC分类号： H03K5/02 , H03K9/02 , H03K5/00 , H03F1/02
CPC分类号： H03K9/02 , H03K5/02
摘要： A decoded PAM input signal is coupled through a first polarity switch (which for one polarity of a polarity signal is closed) to the positive input line of a differential operational amplifier and through the series combination of a second polarity switch (which is open for the one polarity) and an input resistor to the negative input line of the differential amplifier. The positive input line is resistively connected to ground through a first bias resistor and is also connected to ground through the series combination of a second bias resistor and a third polarity switch which is also open for the one polarity. A feedback resistor is connected between the output line and the negative input line of the amplifier. By proper selection of resistances, this circuit provides a prescribed amplification of an input signal and changes its polarity as a function of a digital polarity signal that is applied to the switches, the circuit providing no change in output signal for a change in polarity signal when the input signal is of zero amplitude.

3. 发明授权

US4552994A Apparatus for isolating the voice frequency path from the floating battery feed during signalling 失效
标题翻译：用于在信令期间将语音频率路径与浮动电池馈送隔离的装置
公开(公告)号：US4552994A
公开(公告)日：1985-11-12
申请号：US449026
申请日：1982-12-13
申请人： Constantine V. Skidanenko , Gregor D. McGibbon
发明人： Constantine V. Skidanenko , Gregor D. McGibbon
IPC分类号： H04M3/22 , H04M19/00 , H04Q1/36 , H04M7/00
CPC分类号： H04Q1/36 , H04M19/008 , H04M3/2272
摘要： In a floating battery feed circuit, the voice frequency is normally connected on the subscriber loop side of the blocking capacitor which is used to prevent the DC loop current from flowing in the winding of the associated voice frequency transformer. This capacitor adversely offsets the dial pulse signals. An optical isolator is responsive to the answer control signal from a dial pulse originating (DPO) channel unit and provides a control signal to a switching circuit, which connects the voice frequency circuit to the loop during answer periods and disconnects the voice frequency circuit from the loop during dial pulse signaling.
摘要翻译：在浮动电池馈电电路中，语音频率通常连接在隔离电容器的用户环路侧，用于防止直流回路电流流入相关语音变频器的绕组。该电容不利于拨号脉冲信号。光隔离器响应来自拨号脉冲发起（DPO）信道单元的应答控制信号，并向切换电路提供控制信号，开关电路在应答周期期间将语音频率电路连接到环路，并将话音频率电路与在拨号脉冲信令期间循环。

4. 发明授权

US4511763A Floating dc current source for a subscriber loop circuit 失效
标题翻译：用于用户回路电路的浮动直流电流源
公开(公告)号：US4511763A
公开(公告)日：1985-04-16
申请号：US437936
申请日：1982-11-01
申请人： Constatine V. Skidanenko , Gregor D. McGibbon
发明人： Constatine V. Skidanenko , Gregor D. McGibbon
IPC分类号： H04M19/00
CPC分类号： H04M19/008
摘要： Under an off-hook condition a pulse width control circuit is periodically turned on by narrow pulses from a clock source. This initiates current flow from a primary dc source via the single primary winding of a transformer, and through power transistors connected in a Darlington configuration. A ramp voltage is developed across an emitter resistor of one of said power transistors and this voltage is feedback to said pulse width control circuit. When the ramp voltage reaches a predetermined value, the pulse width control circuit turns off the power transistors and the energy stored in the transformer is transferred by the collapsing magnetic field into alternating current in the secondary winding. This alternating current is rectified and filtered to provide loop current to the telephone subscriber loop. The voltage reflected from the secondary to the primary is stored in a peak detector circuit which operates to control the length of time during which the ramp voltage builds to its predetermined amplitude. The magnitude of this reflected voltage is a function of the loop resistance. Thus, a controlled loop current is provided which is dependent upon the loop resistance. When the loop resistance reaches a predetermined value, a breakdown diode in the output of the peak detector allows current to flow in an "idle power shutdown circuit" which interrupts the clock pulse input to the pulse width control circuit. This permits a reduction in power during the on-hook state.
摘要翻译：在摘机状态下，脉冲宽度控制电路由来自时钟源的窄脉冲周期性地导通。这通过变压器的单个初级绕组和通过以达林顿配置连接的功率晶体管启动来自主要直流电源的电流。在所述功率晶体管之一的发射极电阻器之间产生斜坡电压，并且该电压被反馈到所述脉冲宽度控制电路。当斜坡电压达到预定值时，脉冲宽度控制电路关断功率晶体管，并且存储在变压器中的能量通过塌陷磁场转移到次级绕组中的交流电中。该交流电被整流和滤波以向电话用户回路提供回路电流。从次级到初级反射的电压被存储在峰值检测器电路中，峰值检测器电路用于控制斜坡电压建立到其预定幅度的时间长度。该反射电压的大小是回路电阻的函数。因此，提供依赖于回路电阻的受控回路电流。当环路电阻达到预定值时，峰值检测器的输出中的击穿二极管允许电流在中断向脉冲宽度控制电路输入的时钟脉冲的“空闲电源关断电路”中流动。这允许在挂机状态下降低功率。

5. 发明授权

US4440979A Current sink for DPT channel unit 失效
标题翻译： DPT通道单元的电流吸收器
公开(公告)号：US4440979A
公开(公告)日：1984-04-03
申请号：US373814
申请日：1982-05-03
申请人： Gregor D. McGibbon , Kenneth K. Yu
发明人： Gregor D. McGibbon , Kenneth K. Yu
IPC分类号： H04M7/00 , H04M7/06 , H04Q1/38
CPC分类号： H04M7/0096 , H04Q1/38
摘要： DC Saturation effects in the VF transformer of a DPT are reduced or eliminated with apparatus diverting cental office battery loop current away from windings of the transformer when a trunk circuit is seized for an off-hook condition of a calling parties telephone handset. A physically smaller transformer having increased inductance may then be employed for providing increased return loss at low frequencies. The apparatus comprises a current amplifier that is electrically connected across tip and ring lines, with a first switch means in its feedback path, and second switch means for AC coupling a transformer winding to the lines. When the trunk is idle for an on-hook condition of the handset, the amplifier is disabled and the lines are terminated with a large resistance. When the trunk is seized for an off-hook condition of the handset, binary PF and CF signals cause the current amplifier to shunt the resistor and to draw a prescribed amount of DC loop current on the lines for energizing a central office A-relay. This also turns on the second switch means for passing VF signals on the lines to and from the transformer, while blocking DC current from the winding, and terminating the lines with a prescribed impedance. When the calling party is dialing, the CF signal opens the feedback path so that the amplifier is turned hard on and off by pulsing of the PF signal for changing the termination impedance and causing resistive pulsing in the central office.
摘要翻译： DC在DPT的VF变压器中的饱和效应被降低或消除，当中继电路被抢占主叫方电话听筒的摘机状态时，设备将中心办公室电池回路电流远离变压器的绕组。可以采用具有增加的电感的物理上较小的变压器来在低频下提供增加的回波损耗。该装置包括电流放大器，其在尖端和环形线路之间电连接，其反馈路径中的第一开关装置和用于将变压器绕组交流耦合到线路的第二开关装置。当主干空闲时，手机的挂机状态，放大器被禁用，线路以大电阻终止。当主干被抓取到手机的摘机状态时，二进制PF和CF信号使得电流放大器分流电阻器，并在线路上引出规定数量的直流回路电流，以激励中心局A继电器。这也导通第二开关装置，用于使来自变压器的线路上的VF信号通过，同时阻断来自绕组的DC电流，并以规定的阻抗终止线路。当主叫方正在拨号时，CF信号打开反馈路径，通过脉冲PF信号来改变终端阻抗并引起中心局的电阻脉冲，使放大器变硬。

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