Patents by Inventor Steve W. Bell

Steve W. Bell 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).

  • Patent number: 4492824
    Abstract: There is disclosed a precision linear comparator for a speakerphone circuit having two rectifying constant voltage nodes for separately summing two groups of signals derived from a speakerphone transmit channel and receive channel and supplying at an output terminal a signal representative of the difference between two unblocked summed signals. Each node blocks its summed signal if the signal is not representative of a true voice signal. A null signal is supplied at the output terminal during the absence of unblocked summed signals.
    Type: Grant
    Filed: August 11, 1983
    Date of Patent: January 8, 1985
    Assignee: AT&T Bell Laboratories
    Inventors: Steve W. Bell, Milton L. Embree
  • Patent number: 4305071
    Abstract: In certain situations it is necessary to detect a slight change in a continuous wave signal and to be able to specifically determine the exact position of the change. This is especially necessary in situations where a continuously changing signal (with respect to time) is generated and where it is necessary to determine, at a particular instant of time, any change in the signal from a previous corresponding instant of time. Where the signal is periodic in nature and substantially repeatable between cycles it is possible to establish a memory data base of signal levels as a function of time. Comparisons can then be made on successive cycle against the known, or precalculated data base. Changes between the data base and the new signal result give a positive signal change indication.
    Type: Grant
    Filed: April 16, 1980
    Date of Patent: December 8, 1981
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Steve W. Bell, Robert L. Breeden, Michael J. Sabin