Patents by Inventor Mats Olof Fr{umlaut over (a)}nnhagen

Mats Olof Fr{umlaut over (a)}nnhagen 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).

  • Apparatus and method for the reduction of periodic noise in a sigma-delta modulator
    Patent number: 6175321
    Abstract: The present invention relates to an apparatus and a method for sigma-delta modulation with a reduced periodic noise (idle noise) in a sigma-delta modulator. The reduction is achieved by means of addition of two different Dither signals (217,218) to the sigma-delta modulator. A first Dither signal (218) is constituted by a particular bit pattern of a certain period while a second Dither signal (217) is constituted by a pseudo-random signal of a certain other period.
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: January 16, 2001
    Assignee: Telefonakitiebolaget LM
    Inventors: Mats Olof Fr{umlaut over (a)}nnhagen, Per Henrik Fremrot