Patents by Inventor Allen J. C. Porter

Allen J. C. Porter 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: 7788505
    Abstract: A graphics processor receives a compressed encrypted video stream. The graphics processor decrypts the compressed encrypted video stream and stores a decrypted version (i.e., a decrypted compressed video stream) in a protected portion of an on-chip or off-chip video memory. The graphics processor then permits processors and other bus masters on the graphics processor to access the on-chip video memory, but conditionally limits access to other bus masters that are located off-chip, such as a central processing unit located off-chip and coupled to the graphics processor via a bus.
    Type: Grant
    Filed: December 14, 2005
    Date of Patent: August 31, 2010
    Assignee: ATI Technologies ULC
    Inventors: Allen J. C. Porter, Chun Wang, Kevork Kechichian, Gabriel Varga, David Strasser
  • Patent number: 7365757
    Abstract: A method and apparatus for independent video and graphics scaling in a video graphics system is accomplished by receiving a video data stream, wherein the video data stream includes video data in a first format. A graphics data stream is also received, and the graphics data stream includes graphics data in a second format. The video data of the video data stream is scaled based on a ratio between the first format and a selected video format to produce a scaled video stream. Similarly, the graphics data of the graphics data stream is scaled based on a ratio between the second format and a selected graphics format in order to produce a scaled graphics stream. The scaled video stream and the scaled graphics stream are then merged to produce a video graphics output stream.
    Type: Grant
    Filed: December 17, 1998
    Date of Patent: April 29, 2008
    Assignee: ATI International SRL
    Inventors: Edward G. Callway, Allen J. C. Porter, Chun-Chin David Yeh, Philip L. Swan
  • Patent number: 7055038
    Abstract: A graphics processor receives a compressed encrypted video stream. The graphics processor decrypts the compressed encrypted video stream and stores a decrypted version (i.e., a decrypted compressed video stream) in a protected portion of an on-chip or off-chip video memory. The graphics processor then permits processors and other bus masters on the graphics processor to access the on-chip video memory, but conditionally limits access to other bus masters that are located off-chip, such as a central processing unit located off-chip and coupled to the graphics processor via a bus.
    Type: Grant
    Filed: May 7, 2001
    Date of Patent: May 30, 2006
    Assignee: ATI International SRL
    Inventors: Allen J. C. Porter, Chun Wang, Kevork Kechichian, Gabriel Varga, David Strasser
  • Patent number: 6208354
    Abstract: A method and apparatus for storing and displaying multiple graphical images in a mixed video and graphics display is accomplished by determining an amount of memory sufficient to display a single graphics image in a subset of the display. Once the amount of memory required for a single image is determined, the pre-allocated portion of memory for graphics images is divided into an array. Graphics images are then rendered and stored within this array. One of the pre-rendered images is selected by a control block, wherein the selection is based on registers or parameters referenced by the control block. A display output engine fetches the selected one of the plurality of pre-rendered graphics images that is stored within the array and combines the selected graphics image with the video data stream to produce a display output stream. The display output stream is then fed to a display device that displays the graphics image.
    Type: Grant
    Filed: November 3, 1998
    Date of Patent: March 27, 2001
    Assignee: ATI International SRL
    Inventor: Allen J. C. Porter