Patents by Inventor Sam Gratrix

Sam Gratrix 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).

  • Likelihood detector apparatus and method
    Patent number: 7953187
    Abstract: A method and apparatus for receiving a stream of data values from a data medium, wherein the received data values correspond to ideal values but may include added noise that is dependent on previous noise and dependent on data on the data medium, said ideal values being determined by possible values of data on the medium, and for outputting information specifying a sequence of states corresponding to the stream of received data values, said sequence of states corresponding to possible data values on the medium, the apparatus comprising: a first detector, for calculating state sequence likelihood information based on a first noise model and received data values, and for providing said state sequence likelihood information to a second detector; a second detector for calculating weighting values indicating likelihoods that a data value received at a particular time corresponds to a particular state transition, using a second noise model, received data values, and state sequence likelihood information from the fi
    Type: Grant
    Filed: June 21, 2007
    Date of Patent: May 31, 2011
    Assignee: Forte Design Systems Limited
    Inventors: Sam Gratrix, Robert Jackson, Oleg Zaboronski
  • LIKELIHOOD DETECTOR APPARATUS AND METHOD
    Publication number: 20080002791
    Abstract: A method and apparatus for receiving a stream of data values from a data medium, wherein the received data values correspond to ideal values but may include added noise that is dependent on previous noise and dependent on data on the data medium, said ideal values being determined by possible values of data on the medium, and for outputting information specifying a sequence of states corresponding to the stream of received data values, said sequence of states corresponding to possible data values on the medium, the apparatus comprising: a first detector, for calculating state sequence likelihood information based on a first noise model and received data values, and for providing said state sequence likelihood information to a second detector; a second detector for calculating weighting values indicating likelihoods that a data value received at a particular time corresponds to a particular state transition, using a second noise model, received data values, and state sequence likelihood information from the fi
    Type: Application
    Filed: June 21, 2007
    Publication date: January 3, 2008
    Inventors: Sam Gratrix, Robert Jackson, Oleg Zaboronski