Patents by Inventor Norbert Schiffner

Norbert Schiffner 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).

  • Watermarking digital representations that have undergone lossy compression
    Patent number: 7940954
    Abstract: Techniques for watermarking digital representations such as MPEG audio frames that spread the watermark information across the entire audio frame. The techniques work in conjunction with lossy compression techniques and are compatible with the perception models that are often used with lossy compression techniques. The watermark information is spread by means of transformations between the space/time domain and the frequency domain. When a MPEG audio frame is being watermarked, the compressed audio frame as it is produced by the quantizer is transformed from the frequency domain to the time domain; the time domain transformation is then randomized using a key and the randomized time domain transformation is transformed into the frequency domain.
    Type: Grant
    Filed: November 26, 2003
    Date of Patent: May 10, 2011
    Assignee: Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung E.V.
    Inventors: Petar Horvatic, Norbert Schiffner
  • Watermarking digital representations that have undergone lossy compression
    Publication number: 20090199008
    Abstract: Techniques for watermarking digital representations such as MPEG audio frames that spread the watermark information across the entire audio frame. The techniques work in conjunction with lossy compression techniques and are compatible with the perception models that are often used with lossy compression techniques. The watermark information is spread by means of transformations between the space/time domain and the frequency domain. When a MPEG audio frame is being watermarked, the compressed audio frame as it is produced by the quantizer is transformed from the frequency domain to the time domain; the time domain transformation is then randomized using a key and the randomized time domain transformation is transformed into the frequency domain.
    Type: Application
    Filed: February 7, 2003
    Publication date: August 6, 2009
    Inventors: Petar Horvatic, Norbert Schiffner