公开(公告)号：US4160884A

公开(公告)日：1979-07-10

申请号：US875330

申请日：1978-02-06

申请人： Larry D. Bishop

发明人： Larry D. Bishop

IPC分类号： H04B3/44

CPC分类号： H04B3/44 ,  Y10S323/902

摘要： A telephone transmission system has repeaters spaced along both the transmit and receive legs of the transmission line, with a power supply for the repeaters including a current regulator having positive and negative supply lines connecting the power supply to the two legs of the transmission line. Current surge protectors are connected from the two legs of the transmission line to ground. A pair of current sensors responsive to the current levels in the positive and negative supply lines, between the power supply and the current surge protectors closest to the power supply, produce output signals representative of the respective current levels. A control signal generating means receives the output signals from the current sensors and produces a control signal in response to a deviation of the higher current in the supply lines from a preselected reference level. The control signal is supplied to the current regulator to maintain the higher current level in the supply lines at the preselected reference level.

摘要翻译： 电话传输系统具有沿着传输线的发射端和接收端彼此分开的中继器，用于中继器的电源包括电流调节器，其具有将电源连接到传输线的两条支路的正和负电源线。 电流浪涌保护器从传输线的两条腿连接到地。 一对电流传感器响应于在电源和最靠近电源的电流浪涌保护器之间的正和负电源线中的电流电平产生表示相应电流电平的输出信号。 控制信号发生装置接收来自电流传感器的输出信号，并且响应于供应线路中的较高电流与预选参考电平的偏差而产生控制信号。 控制信号被提供给电流调节器，以将电源线中的较高电流水平保持在预选参考电平。

公开(公告)号：US5426425A

公开(公告)日：1995-06-20

申请号：US957662

申请日：1992-10-07

申请人： Alexander Conrad ,  Charles Bell

发明人： Alexander Conrad ,  Charles Bell

IPC分类号： G07C9/00 ,  G08B3/10 ,  G08B5/22 ,  G08B23/00 ,  H04Q1/39

CPC分类号： G07C9/00111 ,  G08B3/1083

摘要： A locating and monitoring system includes transmitters worn by a person, animal, or equipment to transmit an unique identification code while moving about a facility. The code is transmitted by pulse bursts at diverse times during predetermined time intervals to prevent synchronization with resident signals in the facility. Receivers in the walls or ceilings of the facility respond to the infrared radiation of the pulse bursts and validate the identification code by a checksum of the code through a comparison with a checksum transmitted with the code. The receivers deliver validated codes to arbitrators and receive back signals indicative of the level of an individual assigned to a class wearing the transmitters. Signals from the receivers are received by arbitrators which forward the codes to a CPU for recording start and stop events indicative of movement by transmitters into and out of the reception range of the various receivers.

摘要翻译： 定位和监测系统包括由人，动物或设备佩戴的发射器，用于在围绕设施移动时发送唯一的识别码。 代码在预定时间间隔内在不同时间通过脉冲串发送以防止与设施中的驻留信号同步。 设备的墙壁或天花板中的接收器响应于脉冲串的红外辐射，并通过与用代码传输的校验和的比较来验证代码的校验和。 接收机向仲裁员递送经过验证的代码，并接收指示分配给佩戴发射机的类别的个人的级别的信号。 来自接收机的信号由仲裁器接收，仲裁器将代码转发到CPU，用于记录指示发射机进入和离开各种接收机的接收范围的移动的开始和停止事件。

公开(公告)号：US4313038A

公开(公告)日：1982-01-26

申请号：US122563

申请日：1980-02-19

申请人： Albert G. Nilssen ,  Spencer L. Hermanson

发明人： Albert G. Nilssen ,  Spencer L. Hermanson

IPC分类号： H04Q1/444 ,  H04Q1/453 ,  H04M1/50

CPC分类号： H04Q1/453 ,  H04Q1/444

摘要： A DTMF signal receiver, for telephone systems, includes an amplifier with automatic gain control for receiving and amplifying DTMF and audio signals. A series of bandpass and notch filters receive the output from the amplifier for producing bandpass and notch outputs in response to the DTMF frequencies. A detector receives the bandpass output from each of the filters to produce a signal representing the presence or absence of a signal of each DTMF frequency in the amplifier output, and a DTMF decoder receives the signals from all such detectors and produces output signals in response to simultaneous detection of preselected pairs of DTMF frequencies. A voice guard circuit receives the notch output from the last filter in the series and compares the amplitude of that notch output with a threshold level to produce a disable signal whenever the amplitude of the notch output is greater than the threshold. This disable signal is supplied to the DTMF decoder for disabling the production of output signals by the decoder and thereby preventing the detection of invalid DTMF signals.

摘要翻译： 用于电话系统的DTMF信号接收器包括具有用于接收和放大DTMF和音频信号的自动增益控制的放大器。 一系列带通和陷波滤波器接收放大器的输出，以响应DTMF频率产生带通和陷波输出。 检测器从每个滤波器接收带通输出以产生表示放大器输出中每个DTMF​​频率的信号的存在或不存在的信号，并且DTMF解码器从所有这样的检测器接收信号并产生响应于 同时检测预选的DTMF频率对。 语音保护电路从串联的最后一个滤波器接收陷波输出，并且每当陷波输出的幅度大于阈值时，将该陷波输出的幅度与阈值电平进行比较，以产生禁用信号。 该禁止信号被提供给DTMF解码器，用于禁止解码器产生输出信号，从而防止无效DTMF信号的检测。

公开(公告)号：US4160945A

公开(公告)日：1979-07-10

申请号：US833765

申请日：1977-09-16

申请人： Ian A. Schorr

发明人： Ian A. Schorr

IPC分类号： H02M3/156 ,  H02M3/337 ,  G05F1/56

CPC分类号： H02M3/156 ,  H02M3/3378

摘要： A switching regulator generates controllable pulses from a primary d-c. voltage source and then smooths the pulses to form a d-c. output that varies according to the changes in the pulses. A reference voltage source establishes a d-c. reference signal that varies in magnitude with any variations in the magnitude of the d-c. output but with a substantially constant differential in magnitude between the reference signal and the d-c. output. A voltage or current sensor generates a signal that varies in accordance with changes in the voltage or current level of the d-c. output, and a comparator detects the difference between the reference signal and the signal from the sensing means to produce a control signal that varies according to changes in the difference between the two signals. The pulses that form the d-c. output are adjusted in response to the control signal to maintain the output at a regulated voltage or current level. An auxiliary internal power supply is provided for the reference voltage source and the comparator and the current flow is returned through the reference voltage source and the comparator to the auxiliary internal power supply to minimize power losses in the reference voltage source and the comparator. A predetermined d-c. dry voltage is superimposed on the d-c. voltage from the primary source and floats with respect to the reference signal and the d-c. output.

摘要翻译： 开关稳压器从主d-c产生可控脉冲。 电压源，然后平滑脉冲以形成d-c。 输出根据脉冲的变化而变化。 参考电压源建立d-c。 参考信号随着d-c幅度的任何变化而在幅度上变化。 输出，但是在参考信号和d-c之间具有基本恒定的幅度差。 输出。 电压或电流传感器产生根据d-c的电压或电流电平的变化而变化的信号。 输出，并且比较器检测参考信号和来自感测装置的信号之间的差异，以产生根据两个信号之间的差异的变化而变化的控制信号。 形成d-c的脉冲。 响应于控制信号调节输出，以将输出保持在稳定的电压或电流水平。 为参考电压源和比较器提供辅助内部电源，电流通过参考电压源和比较器返回到辅助内部电源，以最小化参考电压源和比较器中的功率损耗。 预定的d-c。 干电压叠加在d-c上。 相对于参考信号和d-c浮动的来自主源的电压。 输出。

公开(公告)号：US4388500A

公开(公告)日：1983-06-14

申请号：US239061

申请日：1981-02-27

申请人： John F. Regan

发明人： John F. Regan

IPC分类号： H04B1/58 ,  H04M19/00

CPC分类号： H04B1/586 ,  H04M19/005

摘要： An improved electronic hybrid for coupling signals between two wire and four wire transmission circuits. The hybrid includes a pair of amplifiers associated with a pair of terminating impedances which are serially connected between the amplifier outputs and the two wire port. The amplifiers driving the two wire port through the terminating impedances are biased to couple a dc potential to the two wire line whereby the terminating impedances serve as battery feed resistors. Each amplifier-impedance arrangement includes a feedback circuit connected from the junction between the impedance and the two wire port and an input of the amplifier for providing positive feedback for the amplifier so that the output impedance of the hybrid is maintained at a desired level using battery feed resistors of smaller value than heretofore required. The result is the ability to drive longer loops through the smaller series impedances while at the same time exhibiting the desired terminating impedance.

摘要翻译： 一种用于在两线和四线传输电路之间耦合信号的改进的电子混合器。 混合动力车包括一对与一对终端阻抗相关联的放大器，它们串联连接在放大器输出端与两线端口之间。 通过终端阻抗驱动两线端口的放大器被偏置以将直流电位耦合到两条导线，由此终止阻抗用作电池馈送电阻器。 每个放大器 - 阻抗配置包括从阻抗和两个线端口之间的连接点连接的反馈电路和用于为放大器提供正反馈的放大器的输入，使得混合器的输出阻抗使用电池被保持在期望的水平 馈电电阻的值比以前要小。 结果是能够通过更小的串联阻抗驱动较长的环路，同时呈现出期望的终端阻抗。

公开(公告)号：US4203141A

公开(公告)日：1980-05-13

申请号：US891531

申请日：1978-03-30

申请人： Larry D. Bishop ,  Jack C. Parker, Jr.

发明人： Larry D. Bishop ,  Jack C. Parker, Jr.

IPC分类号： H02H3/06 ,  H02H3/087 ,  H02H3/08

CPC分类号： H02H3/06 ,  H02H3/087

摘要： A current regulator for a pulse code modulated (PCM) transmission line is interposed between a voltage potential and a load (consisting of repeater amplifiers along the PCM transmission line) for limiting the current flow to the load. During normal operation, the regulator provides a relatively low impedance path from the voltage potential to the load through a series pass transistor and a sensing resistor. During an overload condition, which is sensed by the sensing resistor, the series pass transistor is deprived of base drive thereby providing a high impedance path with an accompanying increased voltage drop across the series pass transistor of the series regulator. This voltage drop is used to drive a timer which turns the series pass transistor off and on, with a low on time or duty cycle, in order to minimize power dissipation during the overload condition. After the overload condition has been alleviated, the series pass transistor is turned back on by the timer, and due to the low current flowing to the load, the series pass transistor is again returned to its relatively low impedance conducting condition.

摘要翻译： 用于脉冲编码调制（PCM）传输线的电流调节器介于电压电位和负载（由沿PCM传输线的中继器放大器组成）之间，用于限制电流流向负载。 在正常工作期间，稳压器通过串联晶体管和感测电阻提供从电压电位到负载的相对较低的阻抗路径。 在由感测电阻器感测到的过载状态期间，串联晶体管被剥夺基极驱动，从而提供高阻抗路径，并且串联调节器的串联晶体管两端伴有增加的电压降。 该电压降用于驱动定时器，该定时器使串联晶体管导通，导通时间或占空比较小，以便在过载条件下最小化功耗。 在过载条件减轻之后，串联晶体管由定时器导通，由于流过负载的低电流，串联晶体管再次返回到相对低阻抗的导通条件。

公开(公告)号：US4099032A

公开(公告)日：1978-07-04

申请号：US843712

申请日：1977-10-20

申请人： Ralph R. Roge ,  Paul J. Curtis

发明人： Ralph R. Roge ,  Paul J. Curtis

IPC分类号： H04M3/22 ,  H04M19/02 ,  H04M3/02

CPC分类号： H04M19/026 ,  H04M3/2272

摘要： A ground start loop current detector is used to monitor the loop current in a telephone subscriber loop when the subscriber requests service by grounding one line of the loop (ground start), when a busy subscriber discontinues use by opening the loop, and when a called subscriber answers in response to ringing by closing the loop. In order to operate in the presence of longitudinal (common mode) interference currents in the loop, especially in the ground start situation where only one line is monitored, the detector incorporates a differential amplifier which has its inputs connected to the loop through transformer windings that are phased so as to equalize the effects of longitudinal currents on the inputs of the differential amplifier.

公开(公告)号：US4065198A

公开(公告)日：1977-12-27

申请号：US749740

申请日：1976-12-13

申请人： Thomas W. Jordan

发明人： Thomas W. Jordan

IPC分类号： H05K3/30 ,  H05K7/12 ,  H05K1/18

CPC分类号： H05K7/12 ,  H05K3/301 ,  Y10S439/93

摘要： An LED mounting retainer and a printed circuit board display using such retainer for firmly mounting LED's on a printed circuit board with the LED axis parallel to the board and spaced at a precisely determined standoff distance from the board. The retainer is a unitary injection molded plastic element having a body and a locking member joined by a hinge. The body has a recess for receiving the LED, the recess having apertures for allowing the LED leads to project therethrough. The locking member in being pivoted to a locked position engages the leads to bend them about 90.degree. from their initial orientation, causing the leads to project below a mounting surface on the LED retainer, to produce a right angle indicator assembly.

摘要翻译： LED安装保持器和使用这种保持器的印刷电路板显示器，用于将LED固定在印刷电路板上，使LED轴平行于电路板并以与电路板精确确定的距离间隔开。 保持器是具有主体和由铰链连接的锁定构件的整体注模塑料元件。 主体具有用于接收LED的凹部，凹部具有用于允许LED引线突出的孔。 枢转到锁定位置的锁定构件与引线接合以将它们从其初始定向弯曲大约90度，导致引线突出到LED固定器上的安装表面下方，以产生直角指示器组件。

公开(公告)号：US4351986A

公开(公告)日：1982-09-28

申请号：US188925

申请日：1980-09-19

申请人： William A. Fechalos

发明人： William A. Fechalos

IPC分类号： H04M1/2745 ,  H04M3/42 ,  H04M1/27 ,  H04M1/64

CPC分类号： H04M3/42314 ,  H04M1/274591

摘要： Automated telephones with electronic circuits for outputting dial digit sequences respectively corresponding to different ones of a plurality of user's switches when each switch is momentarily actuated. The circuits permit speed dialing of (i) directory numbers, (ii) tandem sequences for accessing outside centers and specific line numbers, and (iii) access or feature codes. The apparatus is characterized especially by devices to create automatically loop breaks to simulate either a hook flash or a re-seize on-hook condition in certain circumstances and despite the fact that the telephone remains off-hook. By simple wire connections between a master or "secretary's " telephone and each of the members' phone sets within a limited group, intelligence signals are interchanged to provide "key line group" action without an elaborate, separate "control box" and even though each telephone of the group is served by the central system only via its own two-wire line.

摘要翻译： 具有电子电路的自动电话，用于当每个开关瞬时致动时分别对应于多个用户开关中的不同用户的开关的拨号数字序列。 这些电路允许（i）目录号码的快速拨号，（ii）用于访问外部中心和特定行号的串联序列，以及（iii）访问或特征码。 该装置的特征在于，在某些情况下，尽管电话机仍然摘机，但是设备可以自动创建循环中断以模拟挂机闪存或重新挂机状态。 通过主人或“秘书”电话与成员电话机中有限组内的简单电线连接，智能信号互换，以提供“关键线组”动作，而无需精心制作的独立“控制箱”，即使每个 该组的电话仅由中央系统通过自己的双线线路服务。

公开(公告)号：US4219699A

公开(公告)日：1980-08-26

申请号：US951516

申请日：1978-10-13

申请人： Albert G. Nilssen ,  Spencer L. Hermanson

发明人： Albert G. Nilssen ,  Spencer L. Hermanson

IPC分类号： H04Q1/444 ,  H04Q3/00 ,  H04Q1/50 ,  H04Q9/12

CPC分类号： H04Q3/00 ,  H04Q1/444

摘要： A station-to-station supervision system for a telephone system has a dual tone multiple frequency (DTMF) signal generator connected to the transmit line at each subscriber station, and a standard audible signal generator is connected to the receive line at each subscriber station for generating dial tone, ringback tone, reorder tone and busy tone in response to supervisory DTMF signals. Control means associated with each subscriber station effect the generation of a dial tone disable DTMF signal from a calling station in response to the combination of an off-hook condition at the calling station and the absence of a DTMF signal from any other station in the system; a busy tone command DTMF signal from any given station in response to the combination of an address signal for that station and an off-hook condition at that station; and a ringback tone command DTMF signal from any given station in response to the combination of an address signal for that station and an on-hook condition at that station. The control means also generates a DTMF signal for terminating ringback tone at a calling station when a called station comes off-hook. The system also includes optional operating modes such as push-to-talk, conference calls, group calls, and all call.

摘要翻译： 用于电话系统的站间站监视系统具有连接到每个用户站处的发送线路的双音多频（DTMF）信号发生器，并且标准可听信号发生器连接到每个用户站处的接收线路 响应于监听的DTMF信号，产生拨号音，回铃音，重新排序音和忙音。 与每个用户站相关联的控制装置响应于呼叫站处的摘机状况和来自系统中任何其他站的DTMF信号的组合而产生来自呼叫站的拨号音禁用DTMF信号 ; 响应于该站的地址信号和该站的摘机状态的组合，来自任何给定站的忙音命令DTMF信号; 以及来自任何给定站的回铃音命令DTMF信号，以响应该站的地址信号和该站的挂机状态的组合。 当呼叫站摘机时，控制装置还产生用于在呼叫站处终止回铃音的DTMF信号。 该系统还包括可选的操作模式，如一键通，电话会议，群组呼叫和所有呼叫。