USA as Represented by Secretary of the Navy

Megatek Corporation

Donald I Parsons

Paul A Singer

Donald J Adrian

Roger K Cernius

David Oakley

Don M French

A raster scan display system for eliminating jagged edges from vectors or polygon boundaries inclined within .+-.45 degrees to horizontal comprising a digital vector generator, a frame buffer memory, a color look-up table, digital-to-analog converters and convolvers placed in front of each digital-to-analog converter for each video output stage of the color look-up table. Fractional address data are appended to each pixel written into the frame-buffer memory to specify the true location of the pixel more accurately. Intensity data for each of the colors assigned thereto by the color look-up table are convolved with a kernel that is selected by the Y fractional address. The convolvers also process the X fractional address which controls the boundaries between pixels on a scan line. Fractional address data read out of the frame-buffer controls the kernels in the convolvers to render the positioning of pixels at four times the addressability of the frame-buffer. Each pixel is micropositioned to an accuracy that is approximately one quarter of the CRT spot diameter. The convolvers double the number of displayed lines, allow for a very rapid rendition of the displayed image, and operate at the troughput of the graphics display system. Memory size is also reduced and image quality greatly enhanced.

Anti-aliasing raster scan display system

A reliable, repeatable and stable VLF/LF atmospheric noise generator is cble of producing noise with known or given amplitude probability distributions and temporal characteristics such as pulse duration, pulse spacing, pulses per unit time and the discharge fine structure between pulses. A pseudo random noise carrier signal is multiplied in a plurality of digital-to-analog converters with the discharge envelopes created in a plurality of interconnected discharge envelope generators. The discharges are representative of cloud-to-ground discharges, intercloud discharges, the discharge rate, strokes per discharge and the discharge fine structure. All of the discharges are readily modifiable by suitably reprogramming operatively coupled memories and microprocessors in accordance with selected loading instructions.

Pseudo atmospheric noise generator having variable amplitude probability

Growing community of inventors

San Diego, CA, United States of America

Donald I Parsons