Patents by Inventor Dieter Wiechert

Dieter Wiechert 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).

  • Zero-IF receiver wih feedback loop for suppressing interfering signals
    Patent number: 4718113
    Abstract: A working on the zero IF principle is disclosed which contains a feedback circuit instead of a preselector for suppressing interfering signals. The interfering signals contained in the incoming signal (F.sub.E) are separated from the useful signal by filters in the baseband. They are then reconverted to the RF value, amplified, and substracted from the incoming signal (F.sub.E) by a subtracter (S1). In the steady state, the output of the subtracter (S1) provides the useful signal, which is converted into the baseband and then fed to a signal processor (SV).
    Type: Grant
    Filed: April 21, 1986
    Date of Patent: January 5, 1988
    Assignee: Alcatel NV
    Inventors: Dietrich Rother, Dieter Wiechert, Manfred Moster