Patents by Inventor Vijay Rangan Raman

Vijay Rangan Raman 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).

  • Automatic target noise cancellation for speech enhancement
    Patent number: 6001131
    Abstract: In a noise reduction communications system, where hands-free operations are utilized, a method and system are described for capturing the ambient noise immediately following speech, and using this sample as the basis for noise cancellation of the speech signal, either in a post-processing or real time processing mode.
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: December 14, 1999
    Assignee: Nynex Science & Technology, Inc.
    Inventor: Vijay Rangan Raman
  • Method and system for differentiating between speech and noise
    Patent number: 5819217
    Abstract: What is disclosed is a signal processing system, wherein a method and apparatus identify background noise in a signal containing speech and noise by separating the signal into frames, evaluating energy levels of selected frames, and identifying the frames as noise if certain consistency tests are met, and speech if certain pulsing, monotone, and speech level tests are met, and transition between speech and noise if transition deviation and consistency levels are met.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: October 6, 1998
    Assignee: NYNEX Science & Technology, Inc.
    Inventor: Vijay Rangan Raman
  • Use of noise segmentation for noise cancellation
    Patent number: 5727072
    Abstract: What is disclosed is a method and system for improving noise cancellation in a signal containing speech by classifying noise frames by their characteristics, and estimating noise based on only one classification at a time. In some instances, the disclosed method further directs the noise estimator and noise canceller to utilize only a designated noise class. Also, the disclosed system can automatically switch between pre-processing and post-processing modes in response to detected changes in acoustic environments.
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: March 10, 1998
    Assignee: Nynex Science & Technology
    Inventor: Vijay Rangan Raman