Patents by Inventor Stephen G. Wozniak

Stephen G. Wozniak has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4278972
    Abstract: A microcomputer including a video generator and timing means which provides color and high resolution graphics on a standard, raster scanned, cathode ray tube is disclosed. A horizontal synchronization counter is synchronized at an odd-submultiple of the color subcarrier reference frequency. A "delayed" count is employed in the horizontal synchronization counter to compensate for color subcarrier phase reversals between lines. This permits vertically aligned color graphics without substantially altering the standard horizontal synchronization frequency. Video color signals are generated directly from digital signals by employing a recirculating shift register.
    Type: Grant
    Filed: January 8, 1980
    Date of Patent: July 14, 1981
    Assignee: Apple Computer, Inc.
    Inventor: Stephen G. Wozniak
  • Patent number: 4217604
    Abstract: An apparatus for digitally controlling the display of color in a phase alternation line (PAL) video display is disclosed. Coded digital signals are shifted in a recirculating shift register. The direction of shifting in the register and the stage at which the signals in the register are sensed are changed as a function of odd/even display lines to compensate for PAL phase reversals.
    Type: Grant
    Filed: September 11, 1978
    Date of Patent: August 12, 1980
    Assignee: Apple Computer, Inc.
    Inventor: Stephen G. Wozniak
  • Patent number: 4210959
    Abstract: A controller for interfacing between a digital computer and a magnetic disc recorder, such as a "floppy" disc, or other recorder or memory is disclosed. The controller, which permits accessing of the disc with minimum control by the computer, is realized with relatively few components and is particularly suited for interfacing between a microcomputer and a "minifloppy". Track selection with a computed velocity profile is employed. Synchronization with a soft sectored disc is achieved without additional hardware.
    Type: Grant
    Filed: May 10, 1978
    Date of Patent: July 1, 1980
    Assignee: Apple Computer, Inc.
    Inventor: Stephen G. Wozniak
  • Patent number: 4136359
    Abstract: A microcomputer including a video generator and timing means which provides color and high resolution graphics on a standard, raster scanned, cathode ray tube is disclosed. A horizontal synchronization counter is synchronized at an odd-submultiple of the color subcarrier reference frequency. A "delayed" count is employed in the horizontal synchronization counter to compensate for color subcarrier phase reversals between lines for the non-interlaced fields. This permits vertically aligned color graphics without substantially altering the standard horizontal synchronization frequency. Video color signals are generated directly from digital signals by employing a recirculating shift register.
    Type: Grant
    Filed: April 11, 1977
    Date of Patent: January 23, 1979
    Assignee: Apple Computer, Inc.
    Inventor: Stephen G. Wozniak