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1. 发明授权

US4965692A Overload detector and protection circuit 失效
标题翻译：过载检测器和保护电路
公开(公告)号：US4965692A
公开(公告)日：1990-10-23
申请号：US387194
申请日：1989-07-31
申请人： Robert V. Burns , Sanjay Gupta
发明人： Robert V. Burns , Sanjay Gupta
IPC分类号： H02H3/087 , H04M19/02
CPC分类号： H04M19/02 , H02H3/087
摘要： An overload protection circuit for power supplies and telecommunications apparatus such as multifrequency ringing generators causes the output voltage to become zero when a current overload is detected. The voltage is kept at zero for a predetermined period of time. Then the output voltage is restored. If an overload is still detected, the output voltage is again brought to zero.
摘要翻译：用于电源和诸如多频振铃发生器的电信设备的过载保护电路使得当检测到电流过载时，输出电压变为零。电压保持为零一段预定的时间。然后恢复输出电压。如果仍然检测到过载，则再次将输出电压置零。

2. 发明授权

US4962527A Series ringing signal generator 失效
标题翻译：系列振铃信号发生器
公开(公告)号：US4962527A
公开(公告)日：1990-10-09
申请号：US355221
申请日：1989-05-22
申请人： Robert V. Burns , Sanjay Gupta
发明人： Robert V. Burns , Sanjay Gupta
IPC分类号： H04M19/02
CPC分类号： H04M19/02
摘要： A series ringing signal generator is disclosed which comprises a source of a user control signal. A programmable ringing signal generator is provided for generating an analog sine wave signal having a selectable amplitude and frequency in response to a selection signal. Finally, sequencing means, coupled between the source of the user control signal and the programmable ringing signal generator, is provided for generating a sequence of selection signals in response to said user control signal.
摘要翻译：公开了一种串联振铃信号发生器，其包括用户控制信号的源。提供了可编程振铃信号发生器，用于响应于选择信号产生具有可选幅度和频率的模拟正弦波信号。最后，提供耦合在用户控制信号源和可编程振铃信号发生器之间的测序装置，用于响应于所述用户控制信号产生选择信号序列。

3. 发明授权

US4959836A Register robustness improvement circuit and method 失效
标题翻译：注册鲁棒性改进电路和方法
公开(公告)号：US4959836A
公开(公告)日：1990-09-25
申请号：US130850
申请日：1987-12-09
申请人： Paul M. Berard , Ajaib S. Bhadare
发明人： Paul M. Berard , Ajaib S. Bhadare
IPC分类号： G06F11/00 , G06F11/14 , G06F11/16
CPC分类号： G06F11/167 , G06F11/14 , G06F11/1625 , G06F11/00 , G06F11/0796
摘要： The present invention describes a robust register circuit for protecting critical control points in data transmission and telecommunications equipment against software included failures. A circuit is provided wherein duplicated data words are written into a pair of registers of any desired bit length. A digital comparator determines whether the two data words are the same, and initiates a data transfer into a third register for transmission to critical hardware control points only when two identical sequential data words are recognized. When no such recognition occurs, new data is not transferred to the third register, and the hardware control points remain controlled by the previous data in the third register.
摘要翻译：本发明描述了一种鲁棒的寄存器电路，用于保护数据传输和电信设备中的关键控制点免受包括软件的故障的影响。提供了一种电路，其中复制的数据字被写入任何所需位长度的一对寄存器中。数字比较器确定两个数据字是否相同，并且只有当识别出两个相同的顺序数据字时，才将数据传输发送到第三个寄存器以传输到关键的硬件控制点。当不发生这种识别时，新的数据不会传送到第三个寄存器，并且硬件控制点由第三个寄存器中的先前数据保持控制。

4. 发明授权

US4914420A Telecommunication system including a remote alarm reporting unit 失效
标题翻译：电信系统包括一个远程报警报告单元
公开(公告)号：US4914420A
公开(公告)日：1990-04-03
申请号：US163907
申请日：1988-03-03
申请人： Salim M. Khan
发明人： Salim M. Khan
IPC分类号： G08B29/00
CPC分类号： G08B29/00
摘要： A telecommunication system is provided consisting of a plurality of functional units each one producing a status signal. A maintenance processor is coupled to each of the functional units and receives the status signals. This processor produces signals representative of the status of the system. A remote alarm reporting unit is coupled to the processor and generates optically isolated alarm signals corresponding to the status representative signals generated by the processor.
摘要翻译：提供的电信系统由多个功能单元组成，每个功能单元产生状态信号。维护处理器耦合到每个功能单元并接收状态信号。该处理器产生代表系统状态的信号。远程报警报告单元耦合到处理器，并产生与由处理器产生的状态代表信号相对应的光学隔离的报警信号。

5. 发明授权

US4887071A Digital activity loss detector 失效
标题翻译：数字活动损失检测器
公开(公告)号：US4887071A
公开(公告)日：1989-12-12
申请号：US233702
申请日：1988-08-18
申请人： Nirmal S. Virdee
发明人： Nirmal S. Virdee
IPC分类号： G06F11/00
CPC分类号： G06F11/0751
摘要： A digital activity detection circuit is provided for monitoring digital input signals such as telecommunications DS1 or DS2 signals, and for generating an alarm when a predetermined input signal loss threshold is reached, such that the input signal loss threshold does not vary with temperature, with component value or with power supply variations. Precise resolution and simplified hardware are achieved in a novel arrangement of counters in the signal activity detector to determine the resolution and signal loss threshold of the detector, all in a digital arrangement without the use of analog devices or retriggerable monostable multivibrators, and in an ASIC fabricable integrated circuit technology such as CMOS.
摘要翻译：提供了数字活动检测电路，用于监视诸如电信DS1或DS2信号的数字输入信号，并且当达到预定的输入信号损失阈值时产生报警，使得输入信号损失阈值不随温度变化，价值或电源变化。在信号活动检测器中的计数器的新颖布置中实现了精确的分辨率和简化的硬件，以确定检测器的分辨率和信号损耗阈值，所有这些都不需要使用模拟设备或可再触发单稳态多谐振荡器，而在ASIC中可编程集成电路技术如CMOS。

6. 发明授权

US4847870A High resolution digital phase-lock loop circuit 失效
标题翻译：高分辨率数字锁相环电路
公开(公告)号：US4847870A
公开(公告)日：1989-07-11
申请号：US125523
申请日：1987-11-25
申请人： James S. Butcher
发明人： James S. Butcher
IPC分类号： H03L7/081 , H04L7/033
CPC分类号： H03L7/0814 , H04L7/0337
摘要： A high resolution digital phase-lock loop circuit is described, which is implemented with an input clock reference frequency which is approximately the same as the output frequency of the phase-lock loop. The output is derived from delaying the input clock a variable number of gate delays ranging from no delay to one period of the input clock. A shift register controls the number of gate delays and a 360 degree phase detector initializes the shift register when the output is delayed by one period of the input clock to provide no delay. Gate delay variations due to integrated circuit process, voltage and temperature are compensated for to provide a relatively constant clock phase correction.
摘要翻译：描述了一种高分辨率数字锁相环电路，其以与锁相环的输出频率近似相同的输入时钟参考频率来实现。该输出是从输入时钟延迟输入时钟的无延迟到一个周期的可变数量的门延迟导出的。移位寄存器控制门延迟的数量，当输出延迟输入时钟的一个周期时，360度相位检测器初始化移位寄存器，以提供延迟。由于集成电路过程，电压和温度导致的门延迟变化被补偿以提供相对恒定的时钟相位校正。

7. 发明授权

US4794604A Optimal error correction method for zero byte time slot interchange (ZBTSI) clear channel data transmission 失效
标题翻译：零字节时隙交换（ZBTSI）的最优纠错方法清除通道数据传输
公开(公告)号：US4794604A
公开(公告)日：1988-12-27
申请号：US67901
申请日：1987-06-30
申请人： Steven S. Gorshe
发明人： Steven S. Gorshe
IPC分类号： H03M5/18 , H04L7/00 , H04L25/49 , H03M13/00 , H04L1/00
CPC分类号： H04L7/0083 , H03M5/18 , H04L25/4925
摘要： A method and circuit for exploiting the characteristics of the ZBTSI algorithm by using the relationship of the data octet and the octets adjacent thereto to detect error conditions such as violations of the DS1 ones density criteria for detection of transmission channel errors in the ZBTSI decoder. This relationship provides an optimized partial error correction technique which minimizes error multiplication in the PCM transmission channels.
摘要翻译：一种通过使用数据八位位组和与其相邻的八位字节的关系来利用ZBTSI算法的特性的方法和电路，用于检测在ZBTSI解码器中用于检测传输信道误差的DS1密度标准的错误条件。该关系提供了优化的部分纠错技术，其使PCM传输信道中的误差乘法最小化。

8. 发明授权

US4928067A Non-intrusive fiber optic electromagnetic field probe apparatus and associated methods 失效
标题翻译：非侵入式光纤电磁场探头设备及相关方法
公开(公告)号：US4928067A
公开(公告)日：1990-05-22
申请号：US286545
申请日：1988-12-19
申请人： Paul U. Lind
发明人： Paul U. Lind
IPC分类号： G01R1/07 , G01R33/028
CPC分类号： G01R33/028 , G01R1/07
摘要： A probe tip is employed to measure electromagnetic fields without the use of a metallic conducting wire or cable which would otherwise distort the field being measured. The probe tip includes a variety of different circuits, each of which contains a separate battery, a powered field measurement sensor and an amplifier. A light source, which is internal to the probe tip and coupled to the amplifier, operates to convert the measured field to an analog optical signal. The analog optical signal is transmitted via an optical fiber to a receiver/preamplifier circuit which converts the optical signal to an electrical signal at the fiber's far end. This receiver/preamplifier device can be coupled directly to an oscilloscope or other instrument which are employed and used for the display or recording the magnitude of the electromagnetic field as measured by the probe.
摘要翻译：探针尖端用于测量电磁场，而不使用金属导线或电缆，否则会导致测量场的变形。探针尖端包括各种不同的电路，每个电路都包含单独的电池，电源场测量传感器和放大器。探针尖端内部并耦合到放大器的光源用于将测量的场转换成模拟光信号。模拟光信号通过光纤传输到接收器/前置放大器电路，该电路将光信号转换为光纤远端的电信号。该接收器/前置放大器装置可以直接耦合到示波器或其他仪器，这些仪器被用于显示或记录由探头测量的电磁场的大小。

9. 发明授权

US4899382A Telephone circuit using DC blocked transformer and negative impedance technique 失效
标题翻译：使用直流阻塞变压器和负阻抗技术的电话电路
公开(公告)号：US4899382A
公开(公告)日：1990-02-06
申请号：US207607
申请日：1988-06-15
申请人： Todd H. Gartner
发明人： Todd H. Gartner
IPC分类号： H04M19/00
CPC分类号： H04M19/001 , H04M19/005
摘要： The invention provides a combination in a SLIC for telecommunication applications of ac impedance synthesis, e.g. raising the impedance of battery feed resistances by feedback techniques; in combination with real battery feed resistors and a dc block transformer. A dc blocked transformer is coupled to line current feed resistors and a feedback loop network to synthesize the desired input impedance, such that the feedback network incorporates both positive and negative feedback. A loop stabilizing resistor is used in shunt with the dc blocked transformer secondary to reduce gain peaking and phase shift. The transformer is an integral part of the feedback loop, and one of the outputs of the solid state circuitry are directly connected to the subscriber line, thereby eliminating the problem of lightning induced transients, in that the output stages of the solid-state operational amplifier circuitry of the invention are transformer isolated from the subscriber line, and are coupled to the subscriber line through high impedances providing high resistance isolation.

10. 发明授权

US4780896A High speed digital counter slip control circuit 失效
标题翻译：高速数字计数器滑差控制电路
公开(公告)号：US4780896A
公开(公告)日：1988-10-25
申请号：US012513
申请日：1987-02-09
申请人： Berton E. Dotter, Jr.
发明人： Berton E. Dotter, Jr.
IPC分类号： H03K23/66 , H03K21/40 , H03K23/40 , H03L7/00
CPC分类号： H03K23/667
摘要： A counter slip control circuit is described for digital transmission systems wherein the counter uses a feedback circuit to define the permissible counter states. The slip control input modifies the feedback function so that certain counter states are either repeated or skipped. A repeated counter state is equivalent to retardation of the counter output signal phase. A skipped counter state is equivalent to advancing the counter output signal phase. The slip control gate is eliminated from the clock input line to the counter and instead is included in the feedback path which eliminates the skew problem and permits the equivalent of adding clock pulses without the requirement for logic speeds of twice the normal clock speed.
摘要翻译：对于数字传输系统描述了一种反向滑移控制电路，其中计数器使用反馈电路来定义允许的计数器状态。滑差控制输入修改反馈功能，使某些计数器状态重复或跳过。重复的计数器状态等效于计数器输出信号相位的延迟。跳过的计数器状态等于推进计数器输出信号相位。滑差控制栅极从计时器的时钟输入线消除，而不是包含在反馈路径中，消除了偏斜问题，并允许等效于添加时钟脉冲，而不需要正常时钟速度的两倍的逻辑速度。

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