-
1.发明授权Method and apparatus for receiving carrier-borne digital signals intended to operate remotely-operable switching devices 失效用于接收用于操作可远程操作的开关装置的载波数字信号的方法和装置
公开(公告)号：US4428061A
公开(公告)日：1984-01-24
申请号：US234533
申请日：1981-02-17
IPC分类号： H02J13/00 , H03M5/12 , H04B3/54 , H04L1/00 , H04L25/49 , H04L27/00 , G06F15/34 , H04L27/18 , H04L27/22
CPC分类号： H02J13/0037 , H04B3/542 , H04B2203/5416 , H04B2203/5433 , H04B2203/5441 , H04B2203/5487 , H04B2203/5491 , Y02E60/7892 , Y04S40/146
摘要： A receiver, for receiving a signal comprising a carrier signal modulated with a digital signal, comprises a circuit for demodulating the received signal to produce an output signal which contains the digital signal. Because of repeated filtering, the digital signal is typically in the form of an approximately sinusoidal signal, which has a component whose frequency is equal to half the basic bit rate of the digital signal: because of noise, this component is subject to considerable timing jitter. To overcome this, the output signal is digitized and applied to a digital correlator, where it is correlated with a reference signal whose frequency is also equal to half the basic bit rate of the digital signal. The reference signal is preferably derived from a phase-locked loop locked to the carrier frequency. The correlator, which is constituted by a microprocessor, determines the instants of time which most nearly coincide with the mean-level crossing points of said component (which instants correspond to transitions between one bit of the digital signal and the next), and also determines successive bit values on the basis of the coincidence determination. The receiver can be used to receive mains-borne signals, i.e. signals transmitted over an electrical power supply network, or radio broadcast signals.
-
公开(公告)号：US4377782A
公开(公告)日：1983-03-22
申请号：US161485
申请日：1980-06-20
IPC分类号： G01R31/08 , G01R31/28 , G01R31/302 , G01R31/315 , G06F11/22
CPC分类号： G01R31/088 , G01R31/28 , G01R31/2806 , G01R31/315 , G06F11/2273
摘要： A probe for sensing direction of flow of an injected current pulse along a conductor of a circuit under test is linked to an ATE, to be triggered to inject the pulse during a test sequence at a step previously found by the ATE to establish a faulty state in the circuit. Thus, the faulty one of several components connected to a circuit node can be identified. The probe itself can also be used independently, and injects an approximately triangular-waveform current pulse which has a steep rising edge and a less steep falling edge, thereby inducing a voltage pulse which is asymmetric about the zero voltage level and thus permits discrimination of the direction of current flow. The probe may have a single current injection contact disposed between the limbs of a bifurcated core for the pick-up coil.
摘要翻译： 用于感测沿着被测电路的导体的注入电流脉冲的流动方向的探针被连接到ATE，以被触发以在ATE先前发现的步骤的测试序列期间注入脉冲以建立故障状态 在电路中。 因此，可以识别连接到电路节点的多个组件中的故障之一。 探头本身也可以独立使用，并且注入大约三角波形的电流脉冲，其具有陡峭的上升沿和较不陡峭的下降沿，从而产生在零电压电平上不对称的电压脉冲，从而允许区分 电流方向。 探针可以具有设置在用于拾取线圈的分叉芯的四肢之间的单电流注入接触。
-
公开(公告)号：US4445085A
公开(公告)日：1984-04-24
申请号：US449705
申请日：1982-12-14
IPC分类号： G01R31/08 , G01R31/28 , G01R31/302 , G01R31/315 , G06F11/22
CPC分类号： G01R31/088 , G01R31/28 , G01R31/2806 , G01R31/315 , G06F11/2273
摘要： A probe for sensing direction of flow of an injected current pulse along a conductor of a circuit under test is linked to an ATE, to be triggered to inject the pulse during a test sequence at a step previously found by the ATE to establish a faulty state in the circuit. Thus, the faulty one of several components connected to a circuit node can be identified. The probe itself can also be used independently, and injects an approximately triangular-waveform current pulse which has a steep rising edge and a less steep falling edge, thereby inducing a voltage pulse which is asymmetric about the zero voltage level and thus permits discrimination of the direction of current flow. The probe may have a single current injection contact disposed between the limbs of a bifurcated core for the pick-up coil.
摘要翻译： 用于感测沿着被测电路的导体的注入电流脉冲的流动方向的探针被连接到ATE，以被触发以在ATE先前发现的步骤的测试序列期间注入脉冲以建立故障状态 在电路中。 因此，可以识别连接到电路节点的多个组件中的故障之一。 探头本身也可以独立使用，并且注入大约三角波形的电流脉冲，其具有陡峭的上升沿和较不陡峭的下降沿，从而产生在零电压电平上不对称的电压脉冲，从而允许区分 电流方向。 探针可以具有设置在用于拾取线圈的分叉芯的四肢之间的单电流注入接触。
-
公开(公告)号：US4663965A
公开(公告)日：1987-05-12
申请号：US672421
申请日：1984-11-16
CPC分类号： G01M3/3272 , G01L9/0033
摘要： It is proposed to store spent nuclear fuel elements in welded-shut steel containers, which are filled with argon at about 2 atmospheres pressure. It is desirable to be able periodically to check the containers for leaks. The invention proposes to do this by providing apparatus for sensing the pressure within the container from outside the container. To achieve this, a pressure responsive bellows is mounted inside the container, such that changes in the container pressure move a metal plate attached to the bellows towards or away from a portion of the inside wall of the container. Then, if the container starts to develop a leak, the pressure will begin to drop, and the gap between the metal plate and the wall will change. This gap can be sensed from outside the container, by an ultrasonic pulse echo technique. Preferably, the bellows and plate are mounted within the head of the combined valve and lifting pintle by which the container is sealed.
摘要翻译： 建议将废核燃料元件储存在约2个大气压的氩气填充的封闭钢容器中。 期望能够周期性地检查容器是否有泄漏。 本发明提出通过提供用于从容器外部感测容器内的压力的装置来实现。 为了实现这一点，压力响应波纹管安装在容器内部，使得容器压力的变化使附接到波纹管的金属板朝向或远离容器的内壁的一部分移动。 然后，如果容器开始产生泄漏，则压力将开始下降，并且金属板和壁之间的间隙将改变。 可以通过超声波脉冲回波技术从容器外部检测该间隙。 优选地，波纹管和板安装在组合阀的头部和提升枢栓中，容器被密封。
-
公开(公告)号：US4166963A
公开(公告)日：1979-09-04
申请号：US835257
申请日：1977-09-21
申请人： Eric Metcalf
发明人： Eric Metcalf
IPC分类号： H03K19/0175 , H03K5/00
CPC分类号： H03K19/017545
摘要： A line buffer circuit for coupling an interface to a data highway without requiring separate signal paths for sense and drive functions, comprises a unity-gain voltage amplifier coupling a line in the highway to the respective interface terminal for the sense function, and a current source connected to sink current from the highway line to ground for the drive function. The current source is controlled so that the current passing through it is proportional to the magnitude of the current passing from the amplifier through the interface terminal.
摘要翻译： 一种用于将接口耦合到数据高速公路而不需要用于感测和驱动功能的单独的信号路径的线路缓冲器电路，包括将公路中的线路耦合到用于感测功能的相应接口端子的单位增益电压放大器，以及电流源 连接到电流从公路线到地面的驱动功能。 控制电流源，使得通过它的电流与从放大器通过接口端子的电流的大小成比例。
-
公开(公告)号：US4468770A
公开(公告)日：1984-08-28
申请号：US351793
申请日：1982-02-24
申请人： Eric Metcalf , Michael C. Jeffery
发明人： Eric Metcalf , Michael C. Jeffery
CPC分类号： H04L1/0057 , H04L1/005
摘要： A data receiver is required to detect successive 50-bit frames of data which are transmitted without any pause between frames and with a start bit value of 1 as the only start-of-frame indication. Error detection and correction is obtained by appending at the transmitter a 13-bit check word to 36 data bits (and the start bit), the value of the check word being chosen such that division of the error-free composite 49-bit code word by a predefined generator polynomial yields a syndrome (remainder) of zero. Calculation of a new syndrome value by the receiver at the speed necessary during initial frame synchronization (i.e. for each successive bit) is effected with an iterative procedure in which the previous syndrome value is left-shifted one place and the newly received digit is appended to it; the generator polynomial is added to the result by modulo-2 arithmetic if the most significant digit of the shifted syndrome word is a 1; and the remainder of -2.sup.49 divided modulo-2 by the generator polynomial is added to the result of the previous step by modulo-2 arithmetic if the digit received 49 bits before the newly received digit is a 1.
摘要翻译： 需要一个数据接收器来检测连续的50位数据帧，这些数据帧在帧之间没有任何暂停，并且起始位值为1，作为唯一的开始帧指示。 通过在发送器处附加13位检查字到36个数据位（和起始位），检查字的值被选择使得无差错复合49位代码字的分割获得错误检测和校正 通过预定义的生成多项式产生零的综合征（余数）。 在初始帧同步期间（即，对于每个连续的比特），以接收机以必要的速度（即，对于每个连续的比特）来计算新的综合征值是通过迭代过程进行的，其中先前的综合征值被左移一个地方，并且新接收的数字被附加到 它; 如果移位的综合征词的最高有效位为1，则通过模2运算将生成多项式加到结果中; 并且如果在新接收的数字之前接收到49位的数字是1，则通过生成多项式将由模2分组的剩余的-249加到前一步的结果中，通过模2运算。
-
公开(公告)号：US4032797A
公开(公告)日：1977-06-28
申请号：US602482
申请日：1975-08-06
摘要： The analogue storage circuit comprises a nonlinear amplifier for amplifying an input voltage. The amplifier includes means for generating a sequence of predetermined voltages, each predetermined voltage being higher than the preceding one in the sequence. A plurality of voltage level responsive circuits are each connected to receive the input signal and a respective one of said predetermined voltages and are each arranged to change from a first state to a second state as the input voltage passes through a level of equality with the respective predetermined voltage in a given direction. An output circuit is provided, as well as a plurality of voltage follower circuits each having a first input connected to receive a respective one of the predetermined voltages and an output connected to the input of the output circuit. Each voltage follower circuit is arranged to be rendered operative by a respective one of the voltage level responsive circuits when the input voltage lies between the respective predetermined voltage received by that voltage level responsive circuit and the next successive predetermined voltage in the given direction. And each voltage follower circuit is arranged, when operative, to co-operate with the output circuit to maintain the output voltage substantially equal to the respective voltage at the first input of the voltage follower circuit.
-
公开(公告)号：US5678926A
公开(公告)日：1997-10-21
申请号：US353102
申请日：1994-12-09
CPC分类号： G01K13/02
摘要： A thermocouple probe 10 suitable for use in a gas turbine engine comprises a thermocouple element 12 which is coaxially arranged inside a protective sheath 16. The thermocouple element 12 is resiliently supported by a helical member 18 which insulates the element 12 from deleterious vibrations induced in the sheath 16. In use, the thermocouple probe 10 projects through an aperture 30 in the casing 32 of a gas chamber 34. Vibrations in the probe 10 are further reduced by ensuring that the longitudinal axis AA of the probe is angularly offset from the central axis BB of the aperture 30, such that the outer periphery of the sheath 16 is in contact with the inner periphery of the aperture 30 in two diametrically opposite and axially offset locations.
摘要翻译： 适用于燃气涡轮发动机的热电偶探头10包括同轴地布置在保护套16内部的热电偶元件12.热电偶元件12由螺旋构件18弹性地支撑，螺旋构件18将元件12与在 护套16.在使用中，热电偶探针10通过气体室34的壳体32中的孔30突出。探针10中的振动通过确保探针的纵向轴线AA与中心轴线成角度偏移而进一步减小 BB，使得护套16的外周在两个直径相对和轴向偏移的位置处与孔30的内周边接触。
-
公开(公告)号：US4100420A
公开(公告)日：1978-07-11
申请号：US763253
申请日：1977-01-26
申请人： Eric Metcalf , Anthony John Ley
发明人： Eric Metcalf , Anthony John Ley
摘要： A displacement transducer comprises a charge coupled device having a plurality of light sensitive stages arranged in a line. An obturating member connected to a member whose displacement is to be transduced is disposed between the charge coupled device and a light source. As the obturating member is moved, it varies the amount of light received by the respective stages of the charge coupled device, so that the charge distribution in the charge coupled device is representative of the position of the obturating member and therefore of the member whose displacement is to be transduced.
摘要翻译： 位移传感器包括具有布置成一行的多个光敏级的电荷耦合器件。 与电容耦合器件和光源之间设置连接到位移要被转换的部件的闭塞部件。 当闭塞构件移动时，其改变由电荷耦合装置的各个级接收的光量，使得电荷耦合装置中的电荷分布代表封闭构件的位置，因此代表位移 将被转导
-
公开(公告)号：USRE36285E
公开(公告)日：1999-08-31
申请号：US024743
申请日：1998-02-17
CPC分类号： G01K13/02
摘要： A thermocouple probe 10 suitable for use in a gas turbine engine comprises a thermocouple element 12 which is coaxially arranged inside a protective sheath 16. The thermocouple element 12 is resiliently supported by a helical member 18 which insulates the element 12 from deleterious vibrations induced in the sheath 16. In use, the thermocouple probe 10 projects through an aperture 30 in the casing 32 of a gas chamber 34. Vibrations in the probe 10 are further reduced by ensuring that the longitudinal axis AA of the probe is angularly offset from the central axis BB of the aperture 30, such that the outer periphery of the sheath 16 is in contact with the inner periphery of the aperture 30 in two diametrically opposite and axially offset locations.
摘要翻译： 适用于燃气涡轮发动机的热电偶探头10包括同轴地布置在保护套16内部的热电偶元件12.热电偶元件12由螺旋构件18弹性地支撑，螺旋构件18将元件12与在 护套16.在使用中，热电偶探针10通过气体室34的壳体32中的孔30突出。探针10中的振动通过确保探针的纵向轴线AA与中心轴线成角度偏移而进一步减小 BB，使得护套16的外周在两个直径相对和轴向偏移的位置处与孔30的内周边接触。
-
-
-
-
-
-
-
-
-
搜索结果
17 条记录 (耗时 0.02 秒)
