Patents by Inventor David A. Dougall

David A. Dougall 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: 5504876
    Abstract: A programmable memory cycle is entered on a keyboard and set by a remote system control processor. Each local processor controls access to memory boards in accordance with the set memory cycle. When the memory cycle is divided into four memory access slots, the processor can provide, in each memory cycle, three read slots and one write slot, two read slots and two write slots, or one read slot and three write slots. When used for processing video signals, the arrangement can process three video channels, or more if expanded by the provision of further memory boards and local processors.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: April 2, 1996
    Assignees: Sony Corporation, Sony United Kingdom Limtied
    Inventors: David A. Dougall, Gavin A. Walker
  • Patent number: 5019903
    Abstract: In apparatus for spatially interpolating between lines of a digital video signal, to produce interpolated lines, a supersampler horizontally interpolates between samples of the signal to produce a supersampled signal consisting of the original samples and interpolated samples located between them. Block matching circuits each determine, for each sample of the supersampled signal, the extent of matching between two blocks of N.times.M samples (N=number of lines and M=number of samples), the blocks being vertically offset in opposite directions with respect to a line to be interpolated, and being horizontally offset in opposite directions with respect to a predetermined sample position. Each block matching circuit produces a matching value for a respective different horizontal offset.
    Type: Grant
    Filed: March 22, 1990
    Date of Patent: May 28, 1991
    Assignee: Sony Corporation
    Inventors: David A. Dougall, James H. Wilkinson, Gavin A. Walker
  • Patent number: 4862267
    Abstract: A motion compensated interpolator for digital television images comprises a three-dimensional variable separable finite impulse response interpolation filter operating in the horizontal, vertical and temporal domains.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: August 29, 1989
    Assignee: Sony Corp.
    Inventors: Clive H. Gillard, David A. Dougall