Patents by Inventor Thomas Ledru

Thomas Ledru 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: 7054363
    Abstract: The DVD standard, with which a very good quality is required all along the recording step, allows for variable bit rate transmission of data, according to which more bits are spent when the pictures are more complex. As the encoded sequence must fit into a fixed bit budget, the invention relates to an encoding method in which, thanks a first analysis step, corrective modifications of the quantization step of the encoding process are carried out at regular intervals during a second control step. These changes are made regarding the state of a reserve of bits, periodically computed and updated, but preferably only when said reserve reaches critical values, and in order to maintain said reserve at a value as close to 0 as possible.
    Type: Grant
    Filed: March 14, 2001
    Date of Patent: May 30, 2006
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Pierre Gautier, Thomas Ledru
  • Publication number: 20010050954
    Abstract: The DVD standard, with which a very good quality is required all along the recording step, allows for variable bit rate transmission of data, according to which more bits are spent when the pictures are more complex. As the encoded sequence must fit into a fixed bit budget, the invention relates to an encoding method in which, thanks a first analysis step, corrective modifications of the quantization step of the encoding process are carried out at regular intervals during a second control step. These changes are made regarding the state of a reserve of bits, periodically computed and updated, but preferably only when said reserve reaches critical values, and in order to maintain said reserve at a value as close to 0 as possible.
    Type: Application
    Filed: March 14, 2001
    Publication date: December 13, 2001
    Inventors: Pierre Gautier, Thomas Ledru