Patents Represented by Attorney Rosemary A. Ryan

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  • PCM coder with shifting idle channel noise level
    Patent number: 4151516
    Abstract: Circuitry useful in PCM coders for effectively shifting the idle channel noise signal to a level midway between the code state boundaries thereby significantly reducing the likelihood that noise signals will cross a boundary and be encoded.
    Type: Grant
    Filed: August 26, 1975
    Date of Patent: April 24, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: John F. O'Neill
  • Nonlocking key telephone set
    Patent number: 4021622
    Abstract: A nonlocking key telephone station is arranged to display full line status information when the station is on-hook and for normally illuminating only the key lamp associated with the line in use at the station when the set is off-hook. To permit a user to discern the full status of the lines terminating at the set when the set is off-hook, circuitry responsive to the depression of one of the keys at the station is provided for displaying full line status information.
    Type: Grant
    Filed: December 5, 1975
    Date of Patent: May 3, 1977
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: John Francis O'Neill, Howard Robert Popper