Abstract: An X-ray system includes an X-ray source including an electronically readable data carrier on which an identification code is stored; a query device for electronically querying the identification code from the data carrier of the X-ray source; and a disabling device for disabling operation of the X-ray source in the event of the queried identification code deviating from a previously received identification code.

Abstract: An X-ray system includes an X-ray source including an electronically readable data carrier on which an identification code is stored; a query device for electronically querying the identification code from the data carrier of the X-ray source; and a disabling device for disabling operation of the X-ray source in the event of the queried identification code deviating from a previously received identification code.

Abstract: A target videogame employing a screen with a moving light spot symbol and a mechanically disjoint target detector. Signals generated by light received in the target detector and by discharging a trigger attached to the target detector are transmitted by wireless communication to the circuits providing for the screen display.

Abstract: A target videogame employing a screen with a moving light spot symbol and a target detector. A frequency selective circuit is provided for selecting the electrical signals generated by the light entering a photosensor in the target detector according to their frequency relationship with respect to the line scanning and frame scanning frequency.

Abstract: An arrangement for initiating and terminating a scanning movement of a video tape track with respect to the scanning path of a playback head is described for use in a helical scan video recorder. A disturbance detector is actuated when the detected video pulse envelope exceeds a predetermined amplitude indicative of a minimum displacement of the track from the scanning path. Such actuated detector operates to couple the servo unit of the tape velocity regulator to a tracking controller. The controller initiates a track scanning operation by applying to the tape drive servo a cyclic modulation which is superimposed upon an error signal derived from the detected video envelope.