Patents by Inventor Ralph P. Coble, Jr.

Ralph P. Coble, 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).

  • Bidirectional adaptive voice frequency repeater
    Patent number: 4628157
    Abstract: A "high" pass filter is employed to shape the low frequency input characteristic to a bidirectional repeater including echo cancelers. This frequency shaping eliminates excessive low frequency signal components from being supplied to the echo cancelers. Consequently, the number of taps, i.e., amplitude coefficients, required in the echo cancelers is minimized.
    Type: Grant
    Filed: September 7, 1984
    Date of Patent: December 9, 1986
    Assignee: AT&T Bell Laboratories
    Inventors: Christopher P. Chance, Ralph P. Coble, Jr., Edwin C. Ingle, Joye A. Jones
  • Bidirectional adaptive voice frequency repeater
    Patent number: 4584441
    Abstract: A large signal detector is employed to detect large amplitude signals incoming to a bidirectional repeater. An output from the detector is supplied to echo cancelers in the repeater and is used to inhibit updating of the echo canceler impulse response characteristic during intervals that such large incoming signals are present.
    Type: Grant
    Filed: September 7, 1984
    Date of Patent: April 22, 1986
    Assignee: AT&T Bell Laboratories
    Inventors: Christopher P. Chance, Ralph P. Coble, Jr., Edwin C. Ingle, Joye A. Jones