Abstract: A SECAM decoder for deriving the signals for a color display from the composite color picture signal determined largely by digital means having digital line switching, multiple delay lines, decoder center frequency clamps and indicator of drift of encoded white, dual digital phase detector for each phased locked loop decoder, switchable de-emphasis and a waveform squaring circuit whereby ease of adjustment to different recording subcarrier frequencies or to sequence color and memory standards is provided.

Abstract: An amplifier comprising a paraphase amplifier and a differential amplifier for converting a signal voltage to a signal current that is linearly related to an input voltage between two well-defined output current limits and further having a dynamic range that is an appreciable fraction of the supply voltage and having low input and output impedance.

Abstract: A light actuated switch apparatus is described in which no movable switch contacts are employed. The switch uses a light source and shutter to activate an array of light sensitive devices to generate a binary code that provides the switching function. One embodiment of the switch apparatus is employed inside a control knob providing a binary code generated by shutter action of a light source on an array of phototransistors. Another embodiment employes the above control knob including switch apparatus as well as a second knob and printed board to form a dual switch apparatus. As no switch contacts are employed there is considerable reduction in electrical components. Additionally, this also greatly reduces the space required for mounting the switch, is readily serviceable or replaceable as no parts are located within an instrument, and is less expensive as no contacts eliminate any wear and potential problems associated with movable through stationary contacts.

Abstract: A system for limiting an FM signal to produce outputs which are TTL compatible, yet retain the zero crossings of the incoming FM signal as long as the amplitude of that signal remains above a chosen minimum and the frequency remains less than a chosen amount.

Abstract: A storage cathode-ray-tube having a single off-axis flood gun is described including auxiliary coils defining electromagnets placed, one electromagnet on either side of the cathode-ray-tube to correct non-symmetrical geometry in optical representations produced on the fluorescent screen of the cathode-ray tube caused by interaction of the conventional principle electron beam under the control of electrical signals during storage operation.

Abstract: A wideband DC current amplifier comprising a pair of transducers, the collector of the input transistor being connected to it's base through a compensating resistance and directly to the base of a second transistor is provided.

Abstract: A power supply system which reduced total power consumption during high-line operation by providing a portion of the load current normally supplied by the series regulator of a series type regulated power supply from a lower voltage source through a passive device.

Abstract: A wideband differential amplifier comprises a pair of differentially connected control devices, for example transistors, having a pair of semiconductor junction input devices coupled thereto for receiving complementary input currents. The input devices exhibit logarithmic characteristics substantially compensating for nonlinear properties of the pair of differentially connected control devices, whereby a linear rather than a nonlinear amplified current output is produced. Multipliers, cascaded amplifiers, and other useful circuit configurations are provided.

Abstract: The information stored on the dielectric target of a bistable storage tube is read out nondestructively employing a pulsed electron beam. The electron beam is turned on for a period having a duration less than necessary to change a given area of the target from one stable stored potential to another, while the period between pulsations is long enough so the tube's flood beam can return a given area to its original stored potential.