Patents by Inventor Wei-hao Hsu

Wei-hao Hsu 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: 8208621
    Abstract: Acoustic echo cancellation methods are provided, in which first and second suppression gains of first and second sub-bands of an Nth acoustic frame are generated, and the second suppression gain of the second sub-band of the Nth acoustic frame is adjusted according to the first suppression gain of the first sub-band of the Nth acoustic frame.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: June 26, 2012
    Assignee: Mediatek Inc.
    Inventor: Wei-Hao Hsu
  • Patent number: 8014516
    Abstract: An exemplary embodiment of an echo cancellation circuit is provided, for use in a voice interaction device simultaneously outputting a remote signal while receiving a local signal. The local signal may comprise an echo generated from the remote signal. A first filter learns the remote signal at a first speed to generate a first coefficient set, and filters the local signal by the first coefficient set to generate a first filter output. A second filter learns the remote signal at a second speed to generate a second coefficient set, and filters the local signal by the second coefficient set to generate a second filter output. A third filter comprises a third coefficient set, canceling the echo from the local signal to generate a third filter output as an echo cancellation result. The controller updates the third coefficient set based on the first, second and third filter outputs.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: September 6, 2011
    Assignee: Mediatek Inc.
    Inventors: Wei-hao Hsu, Hsi-Wen Nien
  • Publication number: 20070189547
    Abstract: Method and apparatus for echo cancellation are provided. In an echo cancellation device, remote and local signals are separated by frequency to generate a plurality of remote and local sub-band signals each corresponding to a sub-band. A plurality of voice activity detectors each respectively receives remote and a local sub-band signals to detect voice activity of the corresponding sub-band. A plurality of filters each learns a corresponding remote sub-band signal to filter a corresponding local sub-band signal, and generates a filter output of the corresponding sub-band. The learning of remote sub-band signal is dependent on a detection result of the corresponding voice activity detector. A synthesizer is coupled to the plurality of filters, mixing the filter outputs therefrom to generate an echo cancellation result.
    Type: Application
    Filed: January 19, 2007
    Publication date: August 16, 2007
    Applicant: MEDIATEK INC.
    Inventors: Wei-hao Hsu, Hsi-Wen Nien
  • Publication number: 20070189506
    Abstract: An exemplary embodiment of an echo cancellation circuit is provided, for use in a voice interaction device simultaneously outputting a remote signal while receiving a local signal. The local signal may comprise an echo generated from the remote signal. A first filter learns the remote signal at a first speed to generate a first coefficient set, and filters the local signal by the first coefficient set to generate a first filter output. A second filter learns the remote signal at a second speed to generate a second coefficient set, and filters the local signal by the second coefficient set to generate a second filter output. A third filter comprises a third coefficient set, canceling the echo from the local signal to generate a third filter output as an echo cancellation result. The controller updates the third coefficient set based on the first, second and third filter outputs.
    Type: Application
    Filed: December 12, 2006
    Publication date: August 16, 2007
    Applicant: MEDIATEK INC.
    Inventors: Wei-hao Hsu, Hsi-Wen Nien