Patents by Inventor Jaakko Sippola

Jaakko Sippola 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).

  • Method of converging an echo canceller
    Patent number: 5381474
    Abstract: Converging of an echo canceller (4A-D) integrated into a telephone exchange (1, 2) is initiated at the start of a telephone call by an internal command of the telephone exchange given by a call control (2) of the telephone exchange as soon as the call control (2) has observed an off-hook state of a called subscriber connection. The command causes the echo canceller (4A-D) to transmit a test signal to the echo path for converging the echo canceller before appearance of the speech signal.
    Type: Grant
    Filed: June 23, 1993
    Date of Patent: January 10, 1995
    Assignee: Nokia Telecommunications Oy
    Inventors: Heimo Lahdemaki, Jaakko Sippola