Patents by Inventor Hans-Dieter Schwartz

Hans-Dieter Schwartz 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).

  • Wave digital filter composed of delays and n-port adaptors
    Patent number: 5197020
    Abstract: A wave digital filter wherein structures are specified such that the transfer function (Y/X) can be arbitrarily prescribed. The filter input signal X--individually weighted via multipliers (E.sub.1 . . . E.sub.x)--is input at all adaptor inputs and outputs with adders. The filter output signal Y is formed by summation of the signals weighted via further multipliers (A.sub.a . . . A.sub.y) which are output at all adapter and delay inputs and outputs.
    Type: Grant
    Filed: January 22, 1991
    Date of Patent: March 23, 1993
    Assignee: Siemens Aktiengesellschaft
    Inventor: Hans-Dieter Schwartz
  • Digital filter switch for data receiver
    Patent number: 4726041
    Abstract: A digital filter switch for use with a data receiver incorporates first and second squaring units connected to the outputs of first and second band-pass filters tuned to the separation and character frequencies in a signal transmission. The outputs of the squaring units are interconnected via an adder to the input of a low-pass filter, which produces the output data signal.
    Type: Grant
    Filed: July 3, 1986
    Date of Patent: February 16, 1988
    Assignee: Siemens Aktiengesellschaft
    Inventors: Bernd Prohaska, Hans-Dieter Schwartz, Rudolf Winkelmann, Gerhard Zettl