Abstract: The visual system within an aircraft flight simulation system receives flight data and terrain data which is formated into a buffer memory. The image data is forwarded to an image processor which translates the image data into face vertex vectors Vf, defining the position relationship between the vertices of each terrain object and the aircraft. The image processor then rotates, clips, and projects the image data into two-dimensional display vectors (Vd). A display generator receives the Vd faces, and other image data to provide analog inputs to CRT devices which provide the window displays for the simulated aircraft. The video signal to the CRT devices passes through an edge smoothing device which prolongs the rise time (and fall time) of the video data inversely as the slope of the edge being smoothed. An operational amplifier within the edge smoothing device has a plurality of independently selectable feedback capacitors each having a different value.

Abstract: A solid state circuit providing the function of a ratchet relay which circuit is relatively immune from noise and is capable of high speed switching operation. The circuit is adapted to receive an AC input trigger signal and convert such signal into an appropriate signal for alternately firing a pair of triacs that are each serially connected with a load and an AC power source. The circuit includes an input section comprising an AC to DC pulse converter, a time delay network, and a pulse shaping circuit which provide a clean input pulse to trigger a flip-flop and an output section including an opto-isolated Darlington transistor pair which is provided with a separate power supply and which operates to alternately fire the triacs in response to the output state of the flip-flop.