Patents by Inventor Asif I. Mohammad

Asif I. Mohammad 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).

  • Systems and methods for surround sound echo reduction
    Patent number: 9497544
    Abstract: A method for echo reduction by an electronic device is described. The method includes nulling at least one speaker. The method also includes mixing a set of runtime audio signals based on a set of acoustic paths to determine a reference signal. The method also includes receiving at least one composite audio signal that is based on the set of runtime audio signals. The method further includes reducing echo in the at least one composite audio signal based on the reference signal.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: November 15, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Asif I. Mohammad, Lae-Hoon Kim, Erik Visser
  • Integrated echo cancellation and noise suppression
    Patent number: 8811601
    Abstract: A method for echo cancellation and noise suppression is disclosed. Linear echo cancellation (LEC) is performed for a primary microphone channel on an entire frequency band or in a range of frequencies where echo is audible. LEC is performed on one or more secondary microphone channels only on a lower frequency range over which spatial processing is effective. The microphone channels are spatially processed over the lower frequency range after LEC. Non-linear noise suppression post-processing is performed on the entire frequency band. Echo post-processing is performed on the entire frequency band.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: August 19, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Asif I. Mohammad, Kwokleung Chan, Ian Ernan Liu, Erik Visser, Dinesh Ramakrishnan
  • SYSTEMS AND METHODS FOR SURROUND SOUND ECHO REDUCTION
    Publication number: 20140003611
    Abstract: A method for echo reduction by an electronic device is described. The method includes nulling at least one speaker. The method also includes mixing a set of runtime audio signals based on a set of acoustic paths to determine a reference signal. The method also includes receiving at least one composite audio signal that is based on the set of runtime audio signals. The method further includes reducing echo in the at least one composite audio signal based on the reference signal.
    Type: Application
    Filed: July 1, 2013
    Publication date: January 2, 2014
    Inventors: Asif I. Mohammad, Lae-Hoon Kim, Erik Visser
  • Methods and apparatus for noise estimation
    Patent number: 8380497
    Abstract: A system and method are disclosed for noise level/spectrum estimation and speech activity detection. Some embodiments include a probabilistic model to estimate noise level and subsequently detect the presence of speech. These embodiments outperform standard voice activity detectors (VADs), producing improved detection in a variety of noisy environments.
    Type: Grant
    Filed: October 14, 2009
    Date of Patent: February 19, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Asif I. Mohammad, Dinesh Ramakrishnan
  • INTEGRATED ECHO CANCELLATION AND NOISE SUPPRESSION
    Publication number: 20120250882
    Abstract: A method for echo cancellation and noise suppression is disclosed. Linear echo cancellation (LEC) is performed for a primary microphone channel on an entire frequency band or in a range of frequencies where echo is audible. LEC is performed on one or more secondary microphone channels only on a lower frequency range over which spatial processing is effective. The microphone channels are spatially processed over the lower frequency range after LEC. Non-linear noise suppression post-processing is performed on the entire frequency band. Echo post-processing is performed on the entire frequency band.
    Type: Application
    Filed: April 4, 2011
    Publication date: October 4, 2012
    Applicant: QUALCOMM Incorporated
    Inventors: Asif I. Mohammad, Kwokleung Chan, Ian Eman Liu, Erik Visser, Dinesh Ramakrishnan
  • METHODS AND APPARATUS FOR NOISE ESTIMATION
    Publication number: 20100094625
    Abstract: A system and method are disclosed for noise level/spectrum estimation and speech activity detection. Some embodiments include a probabilistic model to estimate noise level and subsequently detect the presence of speech. These embodiments outperform standard voice activity detectors (VADs), producing improved detection in a variety of noisy environments.
    Type: Application
    Filed: October 14, 2009
    Publication date: April 15, 2010
    Applicant: QUALCOMM Incorporated
    Inventors: Asif I. Mohammad, Dinesh Ramakrishnan