Patents by Inventor A. Michael Noll

A. Michael Noll 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).

  • Sidetone control circuit for a telephone set
    Patent number: 4081620
    Abstract: A controllable-gain amplifier is connected between the transmitter and receiver of a telephone set and is controlled in response to the level of the telephone user's speech so as to provide an increase in gain when the user speaks too loud and a decrease in gain when the user speaks too low. This results in a sidetone which causes the user to change his or her voice level to obtain an acceptable level of sidetone. A better-controlled user voice level is thus achieved.
    Type: Grant
    Filed: May 20, 1977
    Date of Patent: March 28, 1978
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: David Joel Goodman, James David Johnston, A. Michael Noll