Patents by Inventor Joseph Risley Perrin

Joseph Risley Perrin 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).

  • TEST TECHNIQUE FOR SET-TOP BOXES
    Publication number: 20140078316
    Abstract: A test system (200) for testing for missing or shorted parts within a tuner circuit includes a signal generator (202) for applying a harmonic-containing baseband time varying RF test signal to the tuner circuit. The tuner circuit is tuned to a harmonic of test signal. A detector 208 coupled to the baseband IF output of the tuner circuit detects the voltage generated in response to the applied RF test signal. A voltage measurement device (210) measures voltage detected by detector to provide an indication of the gain. Significant changes in the gain indicate missing part(s) or short circuits.
    Type: Application
    Filed: September 19, 2012
    Publication date: March 20, 2014
    Inventors: Lincheng XIU, Joseph Risley Perrin, Xiaohong Ji
  • Test technique for set-top boxes
    Patent number: 8675078
    Abstract: A test system (200) for testing for missing or shorted parts within a tuner circuit includes a signal generator (202) for applying a harmonic-containing baseband time varying RF test signal to the tuner circuit. The tuner circuit is tuned to a harmonic of test signal. A detector 208 coupled to the baseband IF output of the tuner circuit detects the voltage generated in response to the applied RF test signal. A voltage measurement device (210) measures voltage detected by detector to provide an indication of the gain. Significant changes in the gain indicate missing part(s) or short circuits.
    Type: Grant
    Filed: September 19, 2012
    Date of Patent: March 18, 2014
    Assignee: Thomson Licensing
    Inventors: Lincheng Xiu, Joseph Risley Perrin, Xiaohong Ji