Patents by Inventor Kok Lay Teo

Kok Lay Teo 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).

  • Echo canceller
    Patent number: 6947549
    Abstract: An echo canceller includes two parallel filters and a controller. The controller chooses the best of the two filters for the final echo cancellation. The filter coefficients are exchanged between the two filters constantly so that both filters retain performance all the time even if double-talk and echo path variations occur very closely in time. One filter is strongly robust and will not diverge during double-talk, and another filter is weakly robust and will converge rapidly during echo path variation.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: September 20, 2005
    Assignee: The Hong Kong Polytechnic University
    Inventors: Ka Fai Cedric Yiu, Jiaquan Huo, Kok Lay Teo
  • Echo canceller
    Publication number: 20040161101
    Abstract: An echo canceller includes two parallel filters and a controller. The controller chooses the best of the two filters for the final echo cancellation. The filter coefficients are exchanged between the two filters constantly so that both filters retain performance all the time even if double-talk and echo path variations occur very closely in time. One filter is strongly robust and will not diverge during double-talk, and another filter is weakly robust and will converge rapidly during echo path variation.
    Type: Application
    Filed: February 19, 2003
    Publication date: August 19, 2004
    Inventors: Ka Fai Cedric Yiu, Jiaquan Huo, Kok Lay Teo