Accession Number : ADD013751

Title :   Sawtooth Waveform Generating Circuit for Utilization in a Helmet Mounted Display.

Descriptive Note : Patent, Filed 10 Jul 80, patented 1 Dec 81,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Berke, Herbert ; Allen, John H ; Owen, Joseph R

Report Date : 01 Dec 1981

Pagination or Media Count : 6

Abstract : A sawtooth waveform circuit for a cathode ray tube display apparatus or the like 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. (Author)

Descriptors :   *SAWTOOTH WAVEFORMS, *WAVEFORM GENERATORS, *PATENTS, AMPLIFICATION, CIRCUITS, DIRECT CURRENT, DRIVES, HELMET MOUNTED DISPLAYS, INTEGRATORS, OUTPUT, PULSES, RAMPS, RASTERS, SIGNALS, TRACKING, VARIABLES, VOLTAGE, HEAD(ANATOMY)

Subject Categories : Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE