Patents by Inventor Qiang Cheng

Qiang Cheng 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: 6892175
    Abstract: Methods and apparatus for encoding an arbitrary digital message, e.g., a watermark, into a speech signal are provided. In one aspect of the invention, a method of embedding digital information in a speech signal comprises the steps of: (i) generating a spread spectrum signal, wherein the spread spectrum signal is representative of the digital information and further wherein the spread spectrum signal is within a frequency bandwidth corresponding to speech; and (ii) embedding the spread spectrum signal in the speech signal. By making use of spread spectrum technology and speech analysis techniques in the signal generation and embedding operations, respectively, significantly higher bit rates can be embedded into the speech signal without effecting the perceived quality of the recording. The invention also provides methods and apparatus for recovering the digital information embedded in the speech signal.
    Type: Grant
    Filed: November 2, 2000
    Date of Patent: May 10, 2005
    Assignee: International Business Machines Corporation
    Inventors: Qiang Cheng, Jeffrey Scott Sorensen
  • Publication number: 20050080247
    Abstract: This invention provides detailed sequence analysis and characterization of the gene cluster responsible for the synthesis of leinamycin in Streptomyces atroolivaceus. The leinamycin gene cluster provides a hybrid polyketide synthase/nonribosomal peptide synthetase pathway. Elucidation of the various modules and enzymatic domains characterizing the pathway provides convenient synthetic routes for leinamycins, leinamycin analogs, and various other polyketides, peptides, and hybrid peptide-polyketide natural products.
    Type: Application
    Filed: March 22, 2002
    Publication date: April 14, 2005
    Inventors: Ben Shen, Yi-qiang Cheng, Gong-li Tang
  • Publication number: 20030175888
    Abstract: Genetic and biochemical characterization of the leinamycin biosynthesis gene cluster from Streptomyces atroolivaceus S-140 revealed two PKS genes, lnmI and lnmJ, that encode six PKS modules, none of which contains a cognate AT domain. The AT activity is provided in trans by a discrete protein, LnmG, which loads the malonyl coenzyme A extender unit onto the ACP domains of all six PKS modules. This finding provides a basis for methods of engineering modular polyketide synthases and polyketide synthase/nonribosomal peptide synthetases.
    Type: Application
    Filed: December 9, 2002
    Publication date: September 18, 2003
    Applicant: Wisconsin Alumni Research Foundation
    Inventors: Ben Shen, Yi-Qiang Cheng, Gong-Li Tang