Patents by Inventor Michael Tetelbaum

Michael Tetelbaum 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).

  • Publication number: 20040125942
    Abstract: A method is set forth of controlling an acoustic echo canceller at the output of a beamformer in an audio conferencing device. Information is saved to, and retrieved from, memory that characterizes each of a finite number of look directions, or regions of focus, covering the entire spatial span of the conferencing device. Each time a change occurs from a first look direction to a second look direction, information relating to the workspace captured by the acoustic echo canceller is saved for the first look direction, and previously saved information for the second look direction is retrieved from memory. The acoustic echo cancellation then takes place for the second look direction with the retrieved information.
    Type: Application
    Filed: November 29, 2002
    Publication date: July 1, 2004
    Inventors: Franck Beaucoup, Michael Tetelbaum
  • Publication number: 20040120511
    Abstract: A method of improving convergence of an echo canceller in a full duplex speakerphone, wherein the echo canceller includes LEC (Line Echo Canceller) and AEC (Acoustic Echo Canceller) portions, comprising the steps of capturing coefficients during operation, storing the coefficients, and utilizing the stored coefficients as default values during start-up of a subsequent call. According to the method of the present invention, the amount of echo cancellation necessary to provoke a save of the coefficients decreases with time when it is not achieved by the system despite the presence of a reference signal (i.e. speakerphone signal).
    Type: Application
    Filed: December 18, 2002
    Publication date: June 24, 2004
    Inventors: Franck Beaucoup, Michael Tetelbaum
  • Publication number: 20030130839
    Abstract: Apparatus for controlling noise characteristic estimation in a conferencing system, comprising a noise characteristic estimator for estimating a noise characteristic of a signal of interest transmitted in a first direction through the conferencing system, and a first voice activity detector for detecting audio signal activity in a signal transmitted through the conferencing system in a direction opposite to the signal of interest and in response disabling the noise characteristic estimator.
    Type: Application
    Filed: January 10, 2002
    Publication date: July 10, 2003
    Applicant: Mitel Knowledge Corporation
    Inventors: Franck Beaucoup, Michael Tetelbaum
  • Publication number: 20030053639
    Abstract: A method for detecting voice activity comprises receiving audio signals on a plurality of channels and processing the audio signals on the channels to improve the signal-to-noise ratio thereof. The processed audio signals on each channel are then fed to associated voice activity detection algorithms and further processed. A voice or silence determination is then rendered based on at least the output of the voice activity detection algorithms. A voice activity detector is also provided.
    Type: Application
    Filed: August 15, 2002
    Publication date: March 20, 2003
    Applicant: Mitel Knowledge Corporation
    Inventors: Franck Beaucoup, Michael Tetelbaum
  • Publication number: 20030051532
    Abstract: A method of locating a talker in a reverberant environment comprises receiving multiple audio signals from a microphone array that include direct path audio signal and reverberation signal components. The direct path audio signal components of the multiple audio signals are detected and are used to weight the multiple audio signals. A position estimate based on the weighted audio signals is then calculated. Periods of speech activity are detected and a final position estimate is generated during the periods of speech activity.
    Type: Application
    Filed: August 15, 2002
    Publication date: March 20, 2003
    Applicant: Mitel Knowledge Corporation
    Inventors: Franck Beaucoup, Michael Tetelbaum
  • Publication number: 20020001389
    Abstract: An apparatus for locating a talker, comprising a microphone array for receiving multiple audio signals, wherein the microphone array is characterized by a predetermined beampattern, a spectral conditioner for filtering the audio signals to optimize the beampattern for talker localization, a localization estimator for calculating a localization estimate based on the filtered audio signals, an activity detector for detecting periods of speech activity, and decision logic for verifying the localization estimate during the periods of speech activity.
    Type: Application
    Filed: June 28, 2001
    Publication date: January 3, 2002
    Inventors: Maziar Amiri, Dieter Schulz, Michael Tetelbaum