#electronic_device  a device that accomplishes its purpose electronically
  supertype:  #device  an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
  subtype:  #answering_machine__answeringmachine  an electronic device that answers the telephone and records messages
  subtype:  #beeper__pager  an electronic device that generates a series of beeps when the person carrying it is being paged
  subtype:  #defibrillator  an electronic device that administers an electric shock of preset voltage to the heart through the chest wall in an attempt to restore the normal rhythm of the heart during ventricular fibrillation
  subtype:  #display.electronic_device  an electronic device that represents information in visual form
     subtype:  #caller_ID  a small display that will show you the telephone number of the party calling you
     subtype:  #digital_display__digitaldisplay__alphanumeric_display  a display that gives the information in the form of characters (numbers or letters)
        subtype:  #liquid_crystal_display__LCD  a digital display that uses liquid crystal cells that change reflectivity in an applied electric field; used for portable computer displays and watches etc.
           subtype:  #active_matrix_screen  a type of LCD screen used for some portable computers; there is a separate circuit for each pixel
           subtype:  #passive_matrix_display  a type of LCD screen used for some portable computers; parallel wires run both vertically and horizontally and pixels are turned on when the wires intersecting at that pixel are both energized; "passive matrix displays are generally inferior to active matrix displays"
              subtype:  #dual_scan_display  a type of passive matrix display in which the top and bottom half of the screen are refreshed simultaneously
     subtype:  #display_panel__displaypanel__display_board__displayboard__board  a board on which information can be displayed to public view
        subtype:  #big_board__bigboard  the large display board at the New York Stock Exchange that reports on stocks traded on the exchange
     subtype:  #monitoring_device__monitor  display consisting of a device that takes signals from a computer and displays them on a CRT screen
     subtype:  #CRT_screen__screen  display on the surface of the large end of a cathode-ray tube on which is electronically created
        subtype:  #screen_background__background__desktop  (computer science) the area of the screen in graphical user interfaces against which icons and windows appear
        subtype:  #computer_screen__computer_display  a screen used to display the output of a computer to the user
     subtype:  #window.display  (computer science) a rectangular part of a computer screen that contains a display different from the rest of the screen
        subtype:  #dialog_box__panel  (computer science) a small temporary window in a graphical user interface that appears in order to request information from the user; after the information has been provided the user dismisses the box with `okay' or `cancel'
        subtype:  #foreground.window  (computer science) a window for an active application
  subtype:  #display_adapter__displayadapter__display_adaptor__displayadaptor  (computer science) an electronic device that converts information in memory to video output to a display
  subtype:  #dongle  (computer science) an electronic device that must be attached to a computer in order for it to use protected software
  subtype:  #generator.electronic_device  an electronic device for producing a signal voltage
     subtype:  #oscillator  generator that produces sonic oscillations or alternating current
        subtype:  #crystal_oscillator__crystaloscillator__quartz_oscillator  an oscillator that produces electrical oscillations at a frequency determined by the physical characteristics of a piezoelectric quartz crystal
        subtype:  #local_oscillator__localoscillator__heterodyne_oscillator  an oscillator whose output heterodynes with the incoming radio signal to produce sum and difference tones
     subtype:  #pulse_generator__pulsegenerator  a generator of single or multiple voltage pulses; usually adjustable for pulse rate
        subtype:  #pinger  a pulse generator used for echo sounding in sonar
  subtype:  #hearing_aid__hearingaid__deaf-aid  an electronic device that amplifies sound and is worn to compensate for poor hearing
  subtype:  #logic_element__logicelement  an electronic device that performs an elementary logic operation
     subtype:  #threshold_element__thresholdelement__threshold_gate__thresholdgate  a logic element that performs a threshold operation
  subtype:  #mouse.electronic_device  a hand-operated electronic device that moves the cursor on a computer screen
  subtype:  #multiplexer  a device that can interleave two or more activities
     subtype:  #data_multiplexer  a multiplexer that permits two or more data sources to share a common transmission medium
     subtype:  comms#WDM  wave length division multiplexer
  subtype:  #artificial_pacemaker__pacemaker  an implanted electronic device that takes over the function of the natural cardiac pacemaker
  subtype:  #repeater  (electrical engineering) electronic device that amplifies a signal before transmitting it again; "repeaters can be used in computer networks to extend cabling distances"
  subtype:  #digital_scanner__scanner__imagescanner  an electronic device that generates a digital representation of a document for data input to a computer
  subtype:  #system_clock  an electronic device in a computer that issues a steady high-frequency signal that synchronizes all the internal components
  subtype:  #thermionic_vacuum_tube__tube__vacuum_tube__thermionic_tube__electron_tube__thermionic_valve  electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
     subtype:  #acorn_tube__acorntube  a small vacuum tube; used at high frequencies
     subtype:  #diode__rectifying_tube__rectifying_valve  a thermionic tube having two electrodes; used as a rectifier
     subtype:  #electron_multiplier  a vacuum tube that amplifies a flow of electrons
     subtype:  #gas-discharge_tube__gasdischargetube  a tube in which an electric discharge takes place through a gas
        subtype:  #cathode-ray_tube__cathoderaytube__CRT  a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen
           subtype:  #Crookes_tube  the original gas-discharge cathode-ray tube
           subtype:  #kinescope__picture_tube__picturetube__television_tube  a cathode-ray tube in a television receiver; translates the received signal into a picture on a luminescent screen
              subtype:  #color_tube__colortube__colour_tube__color_television_tube__colour_television_tube__color_TV_tube__colour_TV_tube  a television tube that displays images in full color
                 subtype:  #tricolor_television_tube__tricolour_television_tube__tricolor_tube__tricolour_tube__tricolourtube  a color television tube in which three primary colors are combined to give the full range of colors
        subtype:  #glow_lamp__glow_tube  a gas-discharge tube consisting of a cold cathode and a diode in a tube filled with gas; the color of the glow depends on the particular gas
     subtype:  #klystron  an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation
     subtype:  #magnetron  a diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators
     subtype:  #pentode  a thermionic tube having five electrodes
     subtype:  #television-camera_tube__television_pickup_tube  a tube that rapidly scans an optical image and converts it into electronic signals
        subtype:  #iconoscope  the first practical television-camera for picture pickup; invented in 1923 by Vladimir Kosma Zworykin
        subtype:  #image_orthicon__imageorthicon__orthicon  a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons
     subtype:  #tetrode  a thermionic tube having four electrodes
     subtype:  #triode  a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which making amplification possible
     subtype:  #X-ray_tube  a vacuum tube containing a metal target onto which a beam of electrons is directed at high energy for the generation of X rays
  subtype:  comms#subscriber_line
     subtype:  comms#ADSL  asynchronous subscriber line, assymetric digital subscriber line
     subtype:  comms#DSL  digital subscriber line, HDSL, VDSL

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