Patents by Inventor Birger Hatty

Birger Hatty 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).

  • Voice controlled attenuation adjustment in telephone transmission circuits
    Patent number: 4991167
    Abstract: A process and apparatus for a voice controlled attenuation adjustment in telephone transmission circuits is disclosed. Signals in the sending and receiving directions are decomposed into sub-band signals in a set of frequency sub-bands. Each frequency sub-band is associated with an attenuation device for each direction of transmission. Depending on the level of activity in each direction in a particular sub-band, the attenuation values of the attenuation devices of that particular sub-band are adjusted. The sub-band signals are then recombined.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: February 5, 1991
    Assignee: Telenorma Telefonbau und Normalzeit GmbH
    Inventors: Udo Petri, Eberhard Hansler, Birger Hatty