USA As Represented by Secretary of the Navy

Joseph R Owen

Herbert Berke

John H Allen

Carl R Driskell

A computer generated image simulator is disclosed for scanning a visual target and then providing a visual image of the target which is to be displayed upon a reflective display screen such that a trainee pilot may observe the target. A head tracker which monitors the position of the trainee pilot's head, and an eye tracker which monitors the position of the trainee pilot's eyes, respectively provide head and eye orientation signals to be processed by electronic circuitry such that the target which is projected upon the reflective display screen by a helmet mounted projector will be orientated upon the screen in accordance with the orientation of the trainee pilot's head.

Computer generated image simulator

A sawtooth waveform circuit for a cathode ray tube display apparatus or the ike is disclosed for providing a sawtooth waveform signal in synchronization with the uniformly spaced pulses of a sync signal. A direct current voltage is supplied to an integrator which produces a ramp voltage. Switching means responsive to each pulse of the sync signal shorts the integrator so as to cause the ramp voltage to appear at the output of the integrator as a sawtooth waveform signal. A summing amplifier amplifies the sawtooth waveform signal, and then combines the amplified sawtooth waveform signal with a variable direct current voltage generated by a head tracker so as to provide at the output of the summing amplifier a raster drive signal.

Sawtooth waveform generating circuit for utilization in a helmet mounted

A synthetic motion generator system including a TV camera positioned to rrd a still life scene and a TV monitor connected to receive video signals from the TV camera and in which the vertical and/or horizontal sweep input to the camera is modulated by apparatus including a tuneable oscillator, a sawtooth generator and logic converter and sample and hold circuitry to provide to the camera sweep circuit a modulating signal which is a multiple of the television frame rate, plus or minus a few cycles per second, to thereby generate desired motion in the monitor display image. The invention is particularly applicable to the generation of sea wave motion from a still seascape scene and in this environment the invention includes not only the development of wave motion, but of speed and amplitude control as well as apparent direction variation. These functions are obtained through the medium of frequency and amplitude adjustment on the oscillator equipment and the provision of an input potentiometer and wiper arms connected to the oscillators to coordinately frequency vary the same to produce the desired wave function in association with the direction of a periscope operating the wiper arms.

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Orlando, FL, United States of America

Joseph R Owen