Patents by Inventor Daniel J. Doyle

Daniel J. Doyle 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).

  • Digital signalling receiver for receiving PCM tones
    Patent number: 4203008
    Abstract: A digital signalling receiver translates pulse code modulated (PCM) tone signalling into a signal format compatible with a controller in an associated time division multiplex (TDM) telephone switching facility. In the receiver, steering signals are generated in synchronism with the operation of the switching facility to direct the operation of a time shared filter. The filter performs a plurality of filter functions with a series of PCM signals received from the TDM switching facility and generates therefrom series of filter signals relative each of the filter functions.
    Type: Grant
    Filed: February 26, 1979
    Date of Patent: May 13, 1980
    Assignee: Northern Telecom Limited
    Inventors: Sorin Cohn-Sfetcu, Jackylene K. Hood, Daniel J. Doyle