Patents by Inventor Douglas L. Ross

Douglas L. Ross 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).

  • Analog/digital system for television services
    Patent number: 5920626
    Abstract: A combined IRD scrambler/modulator is provided in a headend. A service provider transmits a digital program signal in a digital data stream to a headend which distributes analog program signal to at least one subscriber. The headend receives an encoded digital program signal in the digital data stream from the service provider and decrypts the digital program signal therefrom. The digital program signal includes an audio and a video portion. The video portion of the signal is scrambled by a scrambler. The digital audio portion of the digital program signal and scrambled video portion of the digital program signal are converted to an analog program signal and transmitted to one or more subscribers.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: July 6, 1999
    Assignee: Scientific-Atlanta, Inc.
    Inventors: Gregory S. Durden, Douglas L. Ross, William E. Wall