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Type = Patent

Mostrando recursos 1 - 20 de 40

  1. High-Sensitivity, High-Speed Continuous Imaging System

    Bender, III, Howard A.; Watson, Scott Avery
    A continuous imaging system for recording low levels of light typically extending over small distances with high-frame rates and with a large number of frames is described. Photodiode pixels disposed in an array having a chosen geometry, each pixel having a dedicated amplifier, analog-to-digital convertor, and memory, provide parallel operation of the system. When combined with a plurality of scintillators responsive to a selected source of radiation, in a scintillator array, the light from each scintillator being directed to a single corresponding photodiode in close proximity or lens-coupled thereto, embodiments of the present imaging system may provide images of x-ray,...

  2. System and Method for Underwater Radiography

    Hunter, James; Keck, Danny Lee; Sims, Jr., James Rae; Watson, Scott Avery
    A system for subsea imaging comprises a first plate having an inner surface, an outer surface, and a cavity formed in the inner surface. In addition, the system comprises a phosphor imaging plate disposed in the cavity. Further, the system comprises a second plate having an inner surface facing the inner surface of the first plate and an outer surface facing away from the outer surface of the first plate. Still further, the system comprises a seal member disposed between the inner surface of the first plate and the inner surface of the second plate. The seal member extends around...

  3. Improvements in and Relating to Gamma Ray and Neutron Detection

    Joyce, Malcolm John; Gamage, Kelum Akurugoda
    No abstract available.

  4. Capacitive Multiplier for Timing Generation

    Bremner, Duncan
    A capacitive multiplier circuit for an integrated circuit includes a capacitor coupled between a first node and a second node. A current source is coupled to provide a controlling current to the second node. A first current path shunts the first node and a second current path shunts the second node. The first current path is a first transistor having its conductance path connected between the first node and the substrate and its control electrode connected to the first node. The second current path is a second transistor having its conductance path connected between the second node and the substrate...

  5. Signal Interface Circuit with Selectable Signal Interface Parameters

    Bremner, Duncan; Benton, Roger K.; Wieser, James B.
    A signal interface circuit with selectable signal interface parameters for a telephone subscriber line includes an impedance circuit having a selectable impedance value, signal terminals having an associated, definable termination impedance, a transmitter circuit having a definable transmitter transfer function and a receiver circuit having a definable receiver transfer function. The signal terminals connect to an external signal line pair having an associated line impedance for conducting outgoing and incoming signals therefrom and thereto, respectively. The transmitter circuit receives the outgoing signal from the signal terminals and provides a transmit signal in accordance with its transmitter transfer function. The receiver...

  6. Power Supply for a Radio Transceiver and Method and Apparatus for Transmitting Data

    Bremner, Duncan
    No abstract available.

  7. Ultra Wideband Antenna

    Kemp, Dean; Bremner, Duncan; Norris, Mark
    No abstract available.

  8. Power Supply for a Radio Transceiver and Method and Apparatus for Transmitting Data

    Bremner, Duncan
    No abstract available.

  9. Communication System and Method

    Bremner, Duncan; Edwards, Fraser
    No abstract available.

  10. Antenna

    Norris, Mark; Bremner, Duncan; Kemp, Dean
    No abstract available.

  11. Transient Signal Detector

    Bremner, Duncan
    A transient signal detector for monitoring a signal line and generating a control signal Which indicates When the mag nitude of a differential signal on the line exceeds either a positive or negative threshold value. The threshold value is de?ned by a single current, thereby alloWing for a single, simple adjustment of such threshold in both the positive and negative directions.

  12. Transient Signal Detector with Temporal Hysteresis

    Bremner, Duncan; Reed, Ray Allen
    A subscriber line interface circuit which includes a transient signal detector with temporal hysteresis. During steady state operation, the drive current for the subscriber loop allows the loop to respond to changes in loop conditions according to a steady state time constant of the loop filter. Upon detection of a line voltage transient which exceeds a predetermined threshold in either a positive or negative direction, the filter time constant is significantly reduced (e.g., 100:1) and held at such reduced value following the initial transient and for a predetermined time period after the line voltage has fallen back below such predetermined...

  13. Transient Signal Detector

    Bremner, Duncan
    A transient signal detector for monitoring a signal line and generating a control signal which indicates when the magnitude of a differential signal on the line exceeds either a positive or negative threshold value. The threshold value is defined by a single current, thereby allowing for a single, simple adjustment of such threshold in both the positive and negative directions.

  14. Asymetric Optical Network Traffic Flow Control

    Bremner, Duncan; Helmer, Finn; Johansen, Eivind
    An optical network may be configured dynamically so that a given channel wavelength can operate in either direction over a fiber in a network. Thus, network providers can provision bandwidth according to the traffic characteristics of the network link in question. A plurality of transceiver modules on either side of a fiber may be switched from a transmit mode to a receive mode depending on the desired direction of the channel.

  15. Signal Line Driving Circuit with Self-Controlled Power Dissipation

    Bremner, Duncan
    A signal line driving circuit with power control for selectively reducing internal power dissipation when driving an external load. While driving the external load with a constant current the output voltage generated across such load is monitored. If the load impedance decreases sufficiently to cause the output voltage to fall below a predetermined threshold value and, therefore, cause the voltage across the signal line driving circuit to increase, the magnitude of the power supply voltage is automatically reduced, thereby reducing the voltage across the signal line driving circuit. Such a signal line driving circuit is particularly advantageous as a subscriber...

  16. Offset Detection

    Bremner, Duncan
    There is provided a method of detecting offset in a sense amplifier of an SRAM memory unit. The method comprises using a sense amplifier of the SRAM memory unit to implement a read of a first data value stored in a memory cell of the SRAM memory unit, and measuring a first time for the sense amplifier to read the first data value. The method further comprises using the sense amplifier to implement a read of a second data value stored in a memory cell of the SRAM memory unit, and measuring a second time for the sense amplifier to...

  17. Antenna and Heat Sink

    Bremner, Duncan
    An antenna 2 is used both as an RF radiator and as a heat sink. A device, such as an integrated circuit package 12, that generates unwanted heat may comprise an antenna and heatsink 2 placed in thermal contact with it. The antenna may be electrically connected to a component 12 either by one or more pins 14 or by capacitive coupling plates (fig 5 16,18), and may be attached by heat-sinking paste or adhesive. The antenna 2 may comprise: a two or three dimensional structure; a meander-line structure; and fins (fig 3, 33-37) of different lengths. The antenna may...

  18. Creating Interface for Local Tests and for Carrying out Local Tests at Telephone User Line and Determining Several Electric Characteristics of Such User Line

    Bremner, Duncan
    The method is carried out by the prodn. of a first and a second voltage (Va,Vb) at a first or a second telephone user line connection (a,b). Measuring these voltages, and distributing a first and a second current (1a,1b) across the first or the second telephone user line connections (a,b). measuring these two currents. Computing a first resistance (Rag) between the first connection (a) and a reference connection as a first function of the measured first and second voltages (Va,Vb) and the measured first and second currents (1a,1b). Computing a second resistance (Rbg) between the second connection (b) and the...

  19. Analog-to-Digital Converter Comprising Selective Comparators

    Bremner, Duncan
    An analog-to-digital converter comprises a plurality of comparators 30, one input of each comparator being connected to an analog signal input 24, and the other input of each comparator being connected so as to receive a respective portion of a reference voltage signal 26. At least one of the plurality of comparators 30 can be selectively activated and deactivated in order to perform a mode of operation of the analog-to-digital converter.

  20. Authentication Device Requiring Close Proximity to Client

    Bremner, Duncan
    A Security Manager Device 16 employs a transmitter (22, fig. 2) requiring close proximity to a client device 10-14, such as a line-of-sight laser or infra-red source or a near-field wireless antenna, in order to set up and authenticate a secure wireless channel without requiring direct physical contact with both devices. Network authentication information such as identities, encryption keys and user security levels are stored in the device (20), use of which is controlled by a biometric verification device (30) or keypad (26) and which is small enough to attach to a key ring. This avoids the risks in current...

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