Sperry Corporation

Lockheed Martin Corporation

Other

Unisys Corporation

David Gordon Hanson

Mauritz L Granberg

Kenneth L Graber

Mark Alan Owen

Gerald L Brown

Samuel A Meddaugh

Leroy A Prohofsky

Robert L Rajala

Dallas Dale Redlin

William G Whipple

Mark A Salser

Robert E Francis

Mark Allen Owen

Charles L Wallace

A circuit arrangement and method are disclosed for providing a video signal to a video display from a selectable subset of a plurality of digital video data carried on a plurality of video data channels. The digital video data is generated from video signals from a plurality of video sources, and each video channel selectably carries either color or monochrome video data. A processor is configured and arranged to interpret display commands, and a selector circuit is coupled to the processor. The selector circuit is arranged for connection to the plurality of video data channels and selects digital video data from a subset of the channels responsive to an input selection signal from the processor. A video data sequencer is coupled to the selector circuit and decodes color and monochrome video data from the video channels responsive to configuration signals indicating selected data formats for the channels and merges the selected video data into frames of video data. A digital-to-analog converter generates an analog video signal from the frames of video data.

Multi-mode video processor

An integrated video distribution system for distributing video signals from a plurality of sources. The system includes a digitizer arrangement arranged to receive analog video signals from a plurality of video sources. The analog video signals are digitized in YCrCb video format and converted to streams of digital video data. The video data is multiplexed and transmitted on a digital video bus having a plurality of video channels. In one embodiment, the digitizers and video bus are integrated with a backplane arrangement that includes expansion slots for a plurality of terminal controllers. The expansion slots provide connections to the video bus. Each terminal controller mounted on the backplane arrangement can be coupled to a display terminal and an input device. The terminal controller selects one or more of the input streams of video data in response to control signals from the input device and converts the selected video data to an analog video signal for output to a display terminal.

Video distribution system and method

A primary processor provides control, address and data signals to a shadow comparison ASIC which also receives corresponding signals from a shadow processor running in delayed lock step with respect to the primary processor. The primary processor is coupled to a system CPU bus which communicates through a memory interface with a DRAM memory. An EDC circuit generates EDC syndrome bits with respect to data written by the primary processor into the memory through the interface. The EDC syndrome bits are stored in memory along with the data. The shadow comparison ASIC includes an identical EDC circuit for generating comparable syndrome bits from the data transmitted from the primary processor to the memory when in the write mode and from the data transmitted from the memory to the primary processor when in the read mode. The syndrome bits generated in the ASIC are compared with those generated at the memory to detect discrepancies indicative of failure when in the write mode and with those stored in the memory to detect discrepancies indicative of failure when in the read mode.

Fault tolerant processor/memory architecture

Apparatus for selectively extracting, magnifying and juxtapositioning selected areas of a raster scan image relative to the primary image so as to permit an observer to better view selected areas of the primary image while still viewing the entire primary image. The apparatus essentially comprises means for sampling x and y radar address data and related video data, means for independently and selectively scaling and offsetting the address data for a primary image memory and for a local zoom memory and means for selecting the areas of the primary image that are to be magnified. The selected areas of the primary image are displayed at a rate defined by a zoom magnification factor, scaled and offset independent of the primary image--but relative to the local zoom area, and displayed by extracting the data from the local zoom memory, rather than the primary image memory, as the display raster scans the areas of the screen where the zoom image is to be displayed.

Local zoom for raster scan displays

A method and apparatus for pseudorandomly decrementing the intensity of data that is displayed on a raster scan display screen. The apparatus essentially comprises means for selecting and partially decrementing data from an image memory and means for controlling the rate at which the partially decremented data is written back into the image memory so that an apparently uniform phosphor decay rate is observed by a viewer.

Synthetic persistence for raster scan displays

A Scanning Sonar Display System comprised of a TV monitor, a scanning mechanism with transducer, control logic with image memory and timing, a power source such as a 12 volt storage battery and a set of operator controls. The type of TV monitor used is well known and similar to those used by raster scan computer terminals. The scanning mechanism has a stepping motor with a 10 to 1 reduction cable drive system to rotate the transducer with home initializing contacts. The control logic includes two counters used as image memory address registers. The first, the refresh counter, is used for reading the image memory during refresh and for determining the horizontal and vertical sync for the TV monitor. The second, the entry counter, is used for writing sonar and depth data into the image memory and is also used for control of the stepping motor. Home initializing contacts are used to initialize this counter. The timing includes a timing ring which provides for continuous control of top delay, range, repetition rate, sonar burst width and transducer frequency. A unique feature of the timing ring is that it allows the scanning mechanism to scan at the maximum rate which is very important for this type of device. Range read out is given in a combination of numbers and dots so that the accuracy is equal to that of the resolution of the monitor.

Scanning sonar display system

A method and apparatus whereby an auxiliary yoke is used in conjunction with a CRT display to correctively deflect the electron beam to a true position within each pixel of a graphics figure, as the graphics figure is displayed on the CRT's screen. The apparatus thus increasing the display's resolution within each pixel so as to permit the smoothing of the displayed graphics figures. The improved resolution being achieved via a four bit binary position correction code, three bits of which are stored in the image memory at those memory addresses corresponding to the coordinates of the pixels that comprise the graphics figure, and one bit of which position correction code is stored at the immediately preceeding memory addresses. The entire position correction code in turn being decoded as the image memory is read and used to drive one or the other of the x and y coil pairs of the x-y auxiliary yoke.

Growing community of inventors

Spring Lake Park, MN, United States of America

David Gordon Hanson