Patents by Inventor John C. Morfitt

John C. Morfitt 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).

  • Mapping objective voice quality metrics to a MOS domain for field measurements
    Patent number: 7327985
    Abstract: A processing unit and method are described herein that are capable of estimating a quality of a speech signal transmitted through a wireless network. The processing unit uses a logistic function to map a score output from an objective voice quality method (PESQ algorithm) into a mean of opinion (MOS) score which is an estimation of the quality of the speech signal that was transmitted through the wireless network. The logistic function has the form: y=1+4/(1+exp(?1.7244*x+5.0187)) where x is the score from the PESQ algoritm which is in the range of ?0.5 to 4.5 and y is the mapped MOS score which is in the range of 1 to 5 wherein if y=5 then the quality of the speech signal is considered excellent and if y=1 then the quality of the speech signal is considered bad.
    Type: Grant
    Filed: January 20, 2004
    Date of Patent: February 5, 2008
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: John C. Morfitt, III, Irina C. Cotanis
  • Mapping objective voice quality metrics to a MOS domain for field measurements
    Publication number: 20040186716
    Abstract: A processing unit and method are described herein that are capable of estimating a quality of a speech signal transmitted through a wireless network. The processing unit uses a logistic function to map a score output from an objective voice quality method (PESQ algorithm) into a mean of opinion (MOS) score which is an estimation of the quality of the speech signal that was transmitted through the wireless network. The logistic function has the form: y=1+4/(1+exp(−1.7244*x+5.0187)) where x is the score from the PESQ algoritm which is in the range of −0.5 to 4.5 and y is the mapped MOS score which is in the range of 1 to 5 wherein if y=5 then the quality of the speech signal is considered excellent and if y=1 then the quality of the speech signal is considered bad.
    Type: Application
    Filed: January 20, 2004
    Publication date: September 23, 2004
    Applicant: Telefonaktiebolaget LM Ericsson
    Inventors: John C. Morfitt, Irina C. Cotanis