Patents by Inventor Clara S. Pelaez Ferrigno

Clara S. Pelaez Ferrigno 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).

  • Noise reduction method and filter for implementing the method particularly useful in telephone communications systems
    Patent number: 5577161
    Abstract: Noise reduction using a digital signal processor includes receiving an input signal which may include a noise-corrupted information signal and/or a noise signal, filtering the noise-corrupted information signal to reduce noise content, and outputting a filtered information signal having the noise content reduced. The filtering includes estimating the spectral envelope of the noise-corrupted information signal amplitude using the formula:E(A.vertline.X,O;H1)*p(H1.vertline.X,O)+E(A.vertline.X,O;H0)*p(H0.vertline. H,O),where X is the spectral envelope of the amplitude of the noise-corrupted information signal, O is the spectral envelope of the noise signal power, H0 denotes the statistical event corresponding to a non-information interval, and H1 denotes the statistical event corresponding to an information interval.
    Type: Grant
    Filed: September 20, 1994
    Date of Patent: November 19, 1996
    Assignee: Alcatel N.V.
    Inventor: Clara S. Pelaez Ferrigno