Patents by Inventor Bhaskar Dharanipragada Rao

Bhaskar Dharanipragada Rao 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).

  • MVDR based feature extraction for speech recognition
    Patent number: 7016839
    Abstract: There is provided a method for extracting feature vectors from a digitized utterance. Spectral envelope estimates are computed from overlapping frames in the digitized utterance based on a Minimum Variance Distortionless Response (MVDR) method. Cepstral feature vectors are generated from the spectral envelope estimates. There is provided a method for generating spectral envelope estimates from a digitized utterance. The spectral envelope estimates are generated from overlapping frames in the digitized utterance based on a harmonic mean of at least two low- to-high resolution spectrum estimates. There is provided a method for reducing variance of a feature stream in a pattern recognition system. The feature stream is temporally or spatially averaged to reduce the variance of the feature stream.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: March 21, 2006
    Assignee: International Business Machines Corporation
    Inventors: Satayanarayana Dharanipragada, Bhaskar Dharanipragada Rao
  • MVDR based feature extraction for speech recognition
    Publication number: 20030144839
    Abstract: There is provided a method for extracting feature vectors from a digitized utterance. Spectral envelope estimates are computed from overlapping frames in the digitized utterance based on a Minimum Variance Distortionless Response (MVDR) method. Cepstral feature vectors are generated from the spectral envelope estimates. There is provided a method for generating spectral envelope estimates from a digitized utterance. The spectral envelope estimates are generated from overlapping frames in the digitized utterance based on a harmonic mean of at least two low- to-high resolution spectrum estimates. There is provided a method for reducing variance of a feature stream in a pattern recognition system. The feature stream is temporally or spatially averaged to reduce the variance of the feature stream.
    Type: Application
    Filed: January 31, 2002
    Publication date: July 31, 2003
    Inventors: Satyanarayana Dharanipragada, Bhaskar Dharanipragada Rao