Patents by Inventor Richard Vandervoort Cox

Richard Vandervoort Cox 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).

  • Modular approach to speech enhancement with an application to speech coding
    Patent number: 6182033
    Abstract: A speech coder separates input digitized speech into component parts on an interval by interval basis. The component parts include gain components, spectrum components and excitation signal components. A set of speech enhancement systems within the speech coder processes the component parts such that each component part has its own individual speech enhancement process. For example, one speech enhancement process can be applied for analyzing the spectrum components and another speech enhancement process can be used for analyzing the excitation signal components.
    Type: Grant
    Filed: July 22, 1998
    Date of Patent: January 30, 2001
    Assignee: AT&T Corp.
    Inventors: Anthony J. Accardi, Richard Vandervoort Cox
  • Tunable perceptual weighting filter for tandem coders
    Patent number: 6144935
    Abstract: A tunable perceptual weighting filter is used in tandem codecs (coder/decoders). Specific filter parameters are advantageously tuned to provide improved performance in tandeming contexts. The parameters used are 10th order LPC (Linear Predictive Coding) predictor coefficients. The system employed uses Low-Delay Code Excited Linear Predictive codecs (LD-CELP).
    Type: Grant
    Filed: July 28, 1997
    Date of Patent: November 7, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Juin-Hwey Chen, Richard Vandervoort Cox, Nuggehally Sampath Jayant
  • Tunable post-filter for tandem coders
    Patent number: 5694519
    Abstract: An adaptive postfilter is used on the decoding side of tandem codecs (coder/decoders). Post-filter parameters are adapted using a backward synthesis filter. The parameters used are 10th order LPC (Linear Predictive Coding) predictor coefficients. The system employed uses Low-Delay Code Excited Linear Predictive codecs (LD-CELP).
    Type: Grant
    Filed: December 9, 1996
    Date of Patent: December 2, 1997
    Assignee: Lucent Technologies, Inc.
    Inventors: Juin-Hwey Chen, Richard Vandervoort Cox, Nuggehally Sampath Jayant