Patents by Inventor Manfred R. Schroeder

Manfred R. Schroeder 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).

  • Predictive speech signal coding with reduced noise effects
    Patent number: 4133976
    Abstract: A predictive speech signal processor features an adaptive filter in a feedback network around the quantizer. The adaptive filter essentially combines the quantizing error signal, the formant related prediction parameter signals and the difference signal to concentrate the quantizing error noise in spectral peaks corresponding to the time-varying formant portions of the speech spectrum so that the quantizing noise is masked by the speech signal formants.
    Type: Grant
    Filed: April 7, 1978
    Date of Patent: January 9, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Bishnu S. Atal, Manfred R. Schroeder