Patents Assigned to Tektronix, Inc.
  • Patent number: 3949417
    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.
    Type: Grant
    Filed: September 16, 1974
    Date of Patent: April 6, 1976
    Assignee: Tektronix, Inc.
    Inventor: Larry Allan Nelson
  • Patent number: 3949317
    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.
    Type: Grant
    Filed: September 16, 1974
    Date of Patent: April 6, 1976
    Assignee: Tektronix, Inc.
    Inventor: Philip Stephen Crosby
  • Patent number: 3946225
    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.
    Type: Grant
    Filed: July 29, 1974
    Date of Patent: March 23, 1976
    Assignee: Tektronix, Inc.
    Inventor: Carlos Luis Beeck
  • Patent number: 3939432
    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.
    Type: Grant
    Filed: March 18, 1974
    Date of Patent: February 17, 1976
    Assignee: Tektronix, Inc.
    Inventor: Larry Allan Nelson
  • Patent number: 3939378
    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.
    Type: Grant
    Filed: January 8, 1975
    Date of Patent: February 17, 1976
    Assignee: Tektronix, Inc.
    Inventors: Johnnie Everett Schmauder, James Kipling Richardson
  • Patent number: 3939434
    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.
    Type: Grant
    Filed: August 23, 1974
    Date of Patent: February 17, 1976
    Assignee: Tektronix, Inc.
    Inventor: Philip Stephen Crosby
  • Patent number: 3934189
    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.
    Type: Grant
    Filed: February 20, 1974
    Date of Patent: January 20, 1976
    Assignee: Tektronix, Inc.
    Inventor: Alfred H. Schamel
  • Patent number: 3931583
    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.
    Type: Grant
    Filed: January 13, 1975
    Date of Patent: January 6, 1976
    Assignee: Tektronix, Inc.
    Inventor: Barrie Gilbert
  • Patent number: RE28773
    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.
    Type: Grant
    Filed: April 9, 1973
    Date of Patent: April 13, 1976
    Assignee: Tektronix, Inc.
    Inventor: Charles B. Gibson, Jr.