Patents by Inventor Robert A. Day, II

Robert A. Day, II 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).

  • Detecting loss of echo cancellation
    Patent number: 5206854
    Abstract: In a full-duplex modem, correlation of an echo estimate signal with an echo-canceled signal is used to determine the presence or absence of a remote signal.
    Type: Grant
    Filed: September 24, 1991
    Date of Patent: April 27, 1993
    Assignee: AT&T Bell Laboratories
    Inventors: William L. Betts, Robert A. Day, II
  • Full duplex data set with half-duplex emulation
    Patent number: 4599719
    Abstract: Half-duplex switched carrier operation is emulated in a full-duplex voiceband data transmission system by utilizing predetermined signal indications in each channel to signal the initiation and termination of user data in that channel and thus to control the Receive Line Signal lead extending to the terminals at respective ends of the transmission channel. The signal indication which signals the initiation of transmission is illustratively two scrambled spaces inserted into an idle-state sequence of continuous scrambled marks. The signal indication which signals the termination of transmission is illustratively a stream of 65 unscrambled marks.
    Type: Grant
    Filed: June 18, 1984
    Date of Patent: July 8, 1986
    Assignee: AT&T Information Systems Inc.
    Inventors: Robert N. Breen, Robert A. Day, II, Victor B. Lawrence, Michael R. Zboray