Patents by Inventor Erhard Kretschmer

Erhard Kretschmer 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 for producing a test signal
    Patent number: 6782246
    Abstract: An apparatus and method are described for producing a test signal with a desired signal-to-noise ratio on a selectable output frequency for measuring a transmission system. A carrier signal, generated from a carrier signal, and a noise signal are remixed with the carrier signal in a bandwidth equal to or smaller than a smallest signal bandwidth of the transmission system. The levels of the carrier signal and the noise signal are adjusted to a predetermined ratio based on a measurement of the remixed carrier signal and the remixed noise signal. The noise signal is attenuated and added to the carrier signal until the desired signal-to-noise ratio is attained.
    Type: Grant
    Filed: February 5, 2002
    Date of Patent: August 24, 2004
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Erhard Kretschmer, Johann Mieslinger, Gregor Kleine