Patents by Inventor David N. Lathrop

David N. Lathrop 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).

  • Incremental construction of search tree with signature pointers for identification of multimedia content
    Patent number: 8312051
    Abstract: Search tree structures with nodes that represent signatures derived from segments of video and audio content are used by systems to identify content and re-establish the correct alignment between video and audio content that have become disassociated with one another. The amount of storage needed to record data representing the tree structure can be reduced by replacing stored signature sets with signature pointers. The efficiency of searches in the tree structure can be improved by constructing and using partial tree structures.
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: November 13, 2012
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Wenyu Jiang, David N. Lathrop
  • Coding techniques using estimated spectral magnitude and phase derived from MDCT coefficients
    Patent number: 6980933
    Abstract: Estimates of spectral magnitude and phase are obtained by an estimation process using spectral information from analysis filter banks such as the Modified Discrete Cosine Transform. The estimation process may be implemented by convolution-like operations with impulse responses. Portions of the impulse responses may be selected for use in the convolution-like operations to trade off between computational complexity and estimation accuracy. Mathematical derivations of analytical expressions for filter structures and impulse responses are disclosed.
    Type: Grant
    Filed: January 27, 2004
    Date of Patent: December 27, 2005
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Corey I. Cheng, Michael J. Smithers, David N. Lathrop
  • Coding techniques using estimated spectral magnitude and phase derived from MDCT coefficients
    Patent number: RE42935
    Abstract: Estimates of spectral magnitude and phase are obtained by an estimation process using spectral information from analysis filter banks such as the Modified Discrete Cosine Transform. The estimation process may be implemented by convolution-like operations with impulse responses. Portions of the impulse responses may be selected for use in the convolution-like operations to trade off between computational complexity and estimation accuracy. Mathematical derivations of analytical expressions for filter structures and impulse responses are disclosed.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: November 15, 2011
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Corey I. Cheng, Michael J. Smithers, David N. Lathrop
  • Coding techniques using estimated spectral magnitude and phase derived from MDCT coefficients
    Patent number: RE44126
    Abstract: Estimates of spectral magnitude and phase are obtained by an estimation process using spectral information from analysis filter banks such as the Modified Discrete Cosine Transform. The estimation process may be implemented by convolution-like operations with impulse responses. Portions of the impulse responses may be selected for use in the convolution-like operations to trade off between computational complexity and estimation accuracy. Mathematical derivations of analytical expressions for filter structures and impulse responses are disclosed.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: April 2, 2013
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Corey I. Cheng, Michael J. Smithers, David N. Lathrop
  • Coding techniques using estimated spectral magnitude and phase derived from MDCT coefficients
    Patent number: RE46684
    Abstract: Estimates of spectral magnitude and phase are obtained by an estimation process using spectral information from analysis filter banks such as the Modified Discrete Cosine Transform. The estimation process may be implemented by convolution-like operations with impulse responses. Portions of the impulse responses may be selected for use in the convolution-like operations to trade off between computational complexity and estimation accuracy. Mathematical derivations of analytical expressions for filter structures and impulse responses are disclosed.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: January 23, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Corey I. Cheng, Michael J. Smithers, David N. Lathrop