Patents by Inventor Kezhou LI

Kezhou LI 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).

  • Method for calculating causal impulse response from a band-limited spectrum
    Patent number: 8694568
    Abstract: A computer-implemented method for calculating a time-domain impulse response with improved causality based on a first spectrum in a frequency domain is disclosed. The first spectrum may be band-limited. The method may calculate a first time-domain impulse response from the first spectrum. The method may remove a non-causal portion of the first system time-domain impulse response to obtain a second time-domain impulse response, and calculate a second spectrum of the second time-domain impulse response. The method may further modify the second spectrum by adding a causal signal such that a difference between the second spectrum and the first spectrum is reduced. The method may also calculate the time-domain impulse response with improved causality from the modified second spectrum.
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: April 8, 2014
    Assignee: Sigrity, Inc.
    Inventors: Kezhou Li, Jing Wang, Jiayuan Fang
  • METHOD FOR CALCULATING CAUSAL IMPULSE RESPONSE FROM A BAND-LIMITED SPECTRUM
    Publication number: 20120269230
    Abstract: A computer-implemented method for calculating a time-domain impulse response with improved causality based on a first spectrum in a frequency domain is disclosed. The first spectrum may be band-limited. The method may calculate a first time-domain impulse response from the first spectrum. The method may remove a non-causal portion of the first system time-domain impulse response to obtain a second time-domain impulse response, and calculate a second spectrum of the second time-domain impulse response. The method may further modify the second spectrum by adding a causal signal such that a difference between the second spectrum and the first spectrum is reduced. The method may also calculate the time-domain impulse response with improved causality from the modified second spectrum.
    Type: Application
    Filed: April 21, 2011
    Publication date: October 25, 2012
    Applicant: Sigrity, Inc.
    Inventors: Kezhou LI, Jing Wang, Jiayuan Fang