Patents by Inventor Gary Fletcher, Jr.

Gary Fletcher, Jr. 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).

  • Quadrature amplitude modulation with line synchronization pulse for video telephone
    Patent number: 4918718
    Abstract: The present invention assigns amplitudes of sine wave cycles in a data packet on I and Q channels of a QAM signal to color, gray or luminance values. Overlapping sine wave cycles on the I and Q channels in the data packet are assigned to the same or neighboring pixels. A synchronizing signal is sent at the beginning of each transmission of a packet. The synchronizing signal is a plurality of cycles at a maximum amplitude on the I and Q channels. The synchronizing signal serves two functions simultaneously. First, it is used to indicate the beginning of a new packet. Second, the phase of the synchronizing signal is used to initialize the demodulator phase detecting circuitry.
    Type: Grant
    Filed: June 28, 1988
    Date of Patent: April 17, 1990
    Assignee: Luma Telecom, Inc.
    Inventors: Lawrence D. Emmons, Gary Fletcher, Jr.