Patents by Inventor Ernan Liu

Ernan Liu 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).

  • Patent number: 10431211
    Abstract: An apparatus includes multiple microphones to generate audio signals based on sound of a far-field acoustic environment. The apparatus also includes a signal processing system to process the audio signals to generate at least one processed audio signal. The signal processing system is configured to update one or more processing parameters while operating in a first operational mode and is configured to use a static version of the one or more processing parameters while operating in the second operational mode. The apparatus further includes a keyword detection system to perform keyword detection based on the at least one processed audio signal to determine whether the sound includes an utterance corresponding to a keyword and, based on a result of the keyword detection, to send a control signal to the signal processing system to change an operational mode of the signal processing system.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: October 1, 2019
    Assignee: Qualcomm Incorporated
    Inventors: Lae-Hoon Kim, Erik Visser, Asif Mohammad, Ian Ernan Liu, Ye Jiang
  • Patent number: 9936290
    Abstract: A method for multi-channel echo cancellation and noise suppression is described. One of multiple echo estimates is selected for non-linear echo cancellation. Echo notch masking is performed on a noise-suppressed signal based on an echo direction of arrival (DOA) to produce an echo-suppressed signal. Non-linear echo cancellation is performed on the echo-suppressed signal based, at least in part, on the selected echo estimate.
    Type: Grant
    Filed: January 15, 2014
    Date of Patent: April 3, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Asif Iqbal Mohammad, Lae-Hoon Kim, Ian Ernan Liu, Erik Visser
  • Publication number: 20180033428
    Abstract: An apparatus includes multiple microphones to generate audio signals based on sound of a far-field acoustic environment. The apparatus also includes a signal processing system to process the audio signals to generate at least one processed audio signal. The signal processing system is configured to update one or more processing parameters while operating in a first operational mode and is configured to use a static version of the one or more processing parameters while operating in the second operational mode. The apparatus further includes a keyword detection system to perform keyword detection based on the at least one processed audio signal to determine whether the sound includes an utterance corresponding to a keyword and, based on a result of the keyword detection, to send a control signal to the signal processing system to change an operational mode of the signal processing system.
    Type: Application
    Filed: December 21, 2016
    Publication date: February 1, 2018
    Inventors: Lae-Hoon Kim, Erik Visser, Asif Mohammad, Ian Ernan Liu, Ye Jiang
  • Patent number: 9552840
    Abstract: A method for audio signal processing is described. The method includes decomposing a recorded auditory scene into a first category of localizable sources and a second category of ambient sound. The method also includes recording an indication of the directions of each of the localizable sources. The method may be performed with a device having a microphone array.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: January 24, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Lae-Hoon Kim, Erik Visser, Pei Xiang, Ian Ernan Liu, Dinesh Ramakrishnan
  • Patent number: 9258661
    Abstract: A method includes receiving, at a processor, a first data frame at a first time from a first microphone. The method also includes receiving a second data frame at the first time from a second microphone. The method further includes calculating a power ratio of the first microphone and the second microphone based on the first data frame and the second data frame in response to determining that the first data frame and the second data frame are noise data frames.
    Type: Grant
    Filed: December 23, 2013
    Date of Patent: February 9, 2016
    Assignee: Qualcomm Incorporated
    Inventors: Jimeng Zheng, Ian Ernan Liu, Dinesh Ramakrishnan, Deepak Kumar Challa
  • Patent number: 9165567
    Abstract: Implementations and applications are disclosed for detection of a transition in a voice activity state of an audio signal, based on a change in energy that is consistent in time across a range of frequencies of the signal. For example, such detection may be based on a time derivative of energy for each of a number of different frequency components of the signal.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: October 20, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Erik Visser, Ian Ernan Liu, Jongwon Shin
  • Patent number: 9031256
    Abstract: A method of orientation-sensitive recording control includes indicating, within a portable device and at a first time, that the portable device has a first orientation relative to a gravitational axis and, based on the indication, selecting a first pair among at least three microphone channels of the portable device. This method also includes indicating, within the portable device and at a second time that is different than the first time, that the portable device has a second orientation relative to the gravitational axis that is different than the first orientation and, based on the indication, selecting a second pair among the at least three microphone channels that is different than the first pair. In this method, each the at least three microphone channels is based on a signal produced by a corresponding one of at least three microphones of the portable device.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: May 12, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Erik Visser, Ian Ernan Liu, Dinesh Ramakrishnan, Lae-Hoon Kim, Pei Xiang
  • Patent number: 9025782
    Abstract: A multi-microphone system performs location-selective processing of an acoustic signal, wherein source location is indicated by directions of arrival relative to microphone pairs at opposite sides of a midsagittal plane of a user's head.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: May 5, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Erik Visser, Ian Ernan Liu
  • Patent number: 8898058
    Abstract: Systems, methods, apparatus, and machine-readable media for voice activity detection in a single-channel or multichannel audio signal are disclosed.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: November 25, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Jongwon Shin, Erik Visser, Ian Ernan Liu
  • Patent number: 8897455
    Abstract: A disclosed method selects a plurality of fewer than all of the channels of a multichannel signal, based on information relating to the direction of arrival of at least one frequency component of the multichannel signal.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: November 25, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Erik Visser, Ernan Liu
  • Publication number: 20140341380
    Abstract: A method includes receiving, at a processor, a first data frame at a first time from a first microphone. The method also includes receiving a second data frame at the first time from a second microphone. The method further includes calculating a power ratio of the first microphone and the second microphone based on the first data frame and the second data frame in response to determining that the first data frame and the second data frame are noise data frames.
    Type: Application
    Filed: December 23, 2013
    Publication date: November 20, 2014
    Applicant: QUALCOMM Incorporated
    Inventors: Jimeng Zheng, Ian Ernan Liu, Dinesh Ramakrishnan, Deepak Kumar Challa
  • 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
  • Patent number: 8724829
    Abstract: Based on phase differences between corresponding frequency components of different channels of a multichannel signal, a measure of directional coherency is calculated. Application of such a measure to voice activity detection and noise reduction are also disclosed.
    Type: Grant
    Filed: October 23, 2009
    Date of Patent: May 13, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Erik Visser, Ian Ernan Liu
  • Patent number: 8620672
    Abstract: Phase-based processing of a multichannel signal, and applications including proximity detection, are disclosed.
    Type: Grant
    Filed: June 8, 2010
    Date of Patent: December 31, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Erik Visser, Ernan Liu
  • Publication number: 20120130713
    Abstract: Systems, methods, apparatus, and machine-readable media for voice activity detection in a single-channel or multichannel audio signal are disclosed.
    Type: Application
    Filed: October 24, 2011
    Publication date: May 24, 2012
    Applicant: QUALCOMM Incorporated
    Inventors: Jongwon Shin, Erik Visser, Ian Ernan Liu
  • Publication number: 20120128160
    Abstract: Systems, methods, apparatus, and machine-readable media for three-dimensional sound recording and reproduction using a multi-microphone setup are described.
    Type: Application
    Filed: October 24, 2011
    Publication date: May 24, 2012
    Applicant: QUALCOMM Incorporated
    Inventors: Lae-Hoon Kim, Erik Visser, Pei Xiang, Ian Ernan Liu, Dinesh Ramakrishnan
  • Publication number: 20120128175
    Abstract: Systems, methods, apparatus, and machine-readable media for orientation-sensitive selection and/or preservation of a recording direction using a multi-microphone setup are described.
    Type: Application
    Filed: October 24, 2011
    Publication date: May 24, 2012
    Applicant: QUALCOMM Incorporated
    Inventors: Erik Visser, Ian Ernan Liu, Dinesh Ramakrishnan, Lae-Hoon Kim, Pei Xiang
  • Publication number: 20120051548
    Abstract: A disclosed method selects a plurality of fewer than all of the channels of a multichannel signal, based on information relating to the direction of arrival of at least one frequency component of the multichannel signal.
    Type: Application
    Filed: February 17, 2011
    Publication date: March 1, 2012
    Applicant: QUALCOMM INCORPORATED
    Inventors: Erik Visser, Ernan Liu
  • Publication number: 20120020485
    Abstract: A multi-microphone system performs location-selective processing of an acoustic signal, wherein source location is indicated by directions of arrival relative to microphone pairs at opposite sides of a midsagittal plane of a user's head.
    Type: Application
    Filed: July 25, 2011
    Publication date: January 26, 2012
    Applicant: QUALCOMM INCORPORATED
    Inventors: ERIK VISSER, IAN ERNAN LIU
  • Publication number: 20110288860
    Abstract: A noise cancelling headset for voice communications contains a microphone at each of the user's ears and a voice microphone. The headset shares the use of the ear microphones for improving signal-to-noise ratio on both the transmit path and the receive path.
    Type: Application
    Filed: May 19, 2011
    Publication date: November 24, 2011
    Applicant: QUALCOMM INCORPORATED
    Inventors: Andre Gustavo Pucci Schevciw, Erik Visser, Dinesh Ramakrishnan, Ian Ernan Liu, Ren Li, Brian Momeyer, Hyun Jin Park, Louis D. Oliveira