Patents by Inventor Ulrich Grothaus

Ulrich Grothaus 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).

  • Patent number: 5196967
    Abstract: In recording systems in which video and audio signals are recorded in tape layers having different depths, a method and apparatus is provided which serves to ensure that the video recording bias for a video signal is always selected and adjusted for optimum results, allowance being made for an audio signal already recorded in the same tracks and for tolerances of the record carrier, the heads and the head amplifier with respect to the playback sensitivity. During recording of the video signal, the video recording bias is varied step-wise. After every change in the video recording bias, a d.c. signal is derived from the playback envelope of the audio signal, the value of the d.c. signal being a measure of the playback amplitude of the audio signal. As soon as the d.c. signal value has reached a predetermined minimum value, the video recording bias is ceased to be changed and the last value of the video recording bias is stored for the next recording process.
    Type: Grant
    Filed: October 17, 1990
    Date of Patent: March 23, 1993
    Assignee: Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holland Shiftung & Co.
    Inventors: Werner Mederer, Ulrich Grothaus, Karl Singer
  • Patent number: 4881134
    Abstract: In known color-under video recorders intertrack chrominance cross talk is eliminated by comb-filtering of the back-converted chrominance signal. However, if the delay circuit needed in the comb filter is a CCD delay line this will give rise to problems both in respect of production engineering and circuit design. These problems are mitigated by the novel comb filter. Comb filtering is applied to the down-converted chrominance signal. The signal path in which the signal is delayed includes a clocked CCD delay line and a phase correction circuit having a linear frequency response and whose dimensioning is such that the overall delay of the chrominance signal corresponds to the signal periodicity imposed by the signal standard and that the phase shift which occurs in the down-converted signal as a result of the recording standard in conjunction with the signal standard is eliminated.
    Type: Grant
    Filed: March 21, 1988
    Date of Patent: November 14, 1989
    Assignee: Grundig E.M.V. Elektro-Mechanische Versuchsanstalt, Max Grundig Holland, Stiftung & Co. KG
    Inventors: Ulrich Grothaus, Klaus Lagerpusch