Patents by Inventor Mendel Aizner

Mendel Aizner 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 system
    Patent number: 5012519
    Abstract: Noise in a speech-plus-noise input signal is suppressed by splitting the input signal into spectral channels and decreasing the gain in the each channel which has a low signal-to-noise ratio (SNR). A voice operated switch (VOX) acts to detect noise-only input to gate a background noise (input signal) estimator and also to gate a residual noise (output signal) estimator. The gain in each of the channels is controlled by the current value (a posteriori) input signal SNR estimate, modified by the prior value (a priori) input signal SNR estimate, and smoothed as a function of the residual (output noise signal) estimate.
    Type: Grant
    Filed: January 5, 1990
    Date of Patent: April 30, 1991
    Assignee: The DSP Group, Inc.
    Inventors: Shabtai Adlersberg, Yoram Stettiner, Mendel Aizner, Alberto Berstein
  • A method for indicating the presence of speech in an audio signal
    Patent number: 4959865
    Abstract: A voice operated switch employs digital signal processing techniques to examine audio signal frames having harmonic content to identify voiced phonemes and to determined whether the signal frame contains primarily speech or noise. The method and apparatus employ a multiple-stage, delayed-decision adaptive digital signal processing algorithm implemented through the use of commonly available electronic circuit components.
    Type: Grant
    Filed: February 3, 1988
    Date of Patent: September 25, 1990
    Assignee: The DSP Group, Inc.
    Inventors: Yoram Stettiner, Shabtai Adlersberg, Mendel Aizner