Patents by Inventor Johann Freundorfer

Johann Freundorfer 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).

  • Active noise reduction
    Patent number: 10056066
    Abstract: A noise reducing sound reproduction system comprises a loudspeaker that is connected to a loudspeaker input path and that radiates noise reducing sound. A microphone is connected to a microphone output path and picks up the noise or a residual thereof. An active noise reduction filter is connected between the microphone output path and the loudspeaker input path, and the active noise reduction filter comprises at least one shelving filter.
    Type: Grant
    Filed: August 14, 2017
    Date of Patent: August 21, 2018
    Assignee: Harman Becker Automotive Systems GmbH
    Inventors: Markus Christoph, Johann Freundorfer, Thomas Hommel
  • ACTIVE NOISE REDUCTION
    Publication number: 20170345407
    Abstract: A noise reducing sound reproduction system comprises a loudspeaker that is connected to a loudspeaker input path and that radiates noise reducing sound. A microphone is connected to a microphone output path and picks up the noise or a residual thereof. An active noise reduction filter is connected between the microphone output path and the loudspeaker input path, and the active noise reduction filter comprises at least one shelving filter.
    Type: Application
    Filed: August 14, 2017
    Publication date: November 30, 2017
    Inventors: Markus CHRISTOPH, Johann FREUNDORFER, Thomas HOMMEL
  • Active noise reduction
    Patent number: 9734814
    Abstract: A noise reducing sound reproduction system comprises a loudspeaker that is connected to a loudspeaker input path and that radiates noise reducing sound. A microphone is connected to a microphone output path and picks up the noise or a residual thereof. An active noise reduction filter is connected between the microphone output path and the loudspeaker input path, and the active noise reduction filter comprises at least one shelving filter.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: August 15, 2017
    Assignee: Harman Becker Automotive Systems GmbH
    Inventors: Markus Christoph, Johann Freundorfer, Thomas Hommel
  • Active noise reduction
    Patent number: 9099076
    Abstract: A noise reducing sound reproduction system comprises a loudspeaker that is connected to a loudspeaker input path and that radiates noise reducing sound. A microphone is connected to a microphone output path and picks up the noise or a residual thereof. An active noise reduction filter is connected between the microphone output path and the loudspeaker input path, and the active noise reduction filter comprises at least one shelving filter.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: August 4, 2015
    Assignee: Harman Becker Automotive Systems GmbH
    Inventors: Markus Christoph, Johann Freundorfer, Thomas Hommel
  • ACTIVE NOISE REDUCTION
    Publication number: 20150201277
    Abstract: A noise reducing sound reproduction system comprises a loudspeaker that is connected to a loudspeaker input path and that radiates noise reducing sound. A microphone is connected to a microphone output path and picks up the noise or a residual thereof. An active noise reduction filter is connected between the microphone output path and the loudspeaker input path, and the active noise reduction filter comprises at least one shelving filter.
    Type: Application
    Filed: March 27, 2015
    Publication date: July 16, 2015
    Inventors: Markus Christoph, Johann Freundorfer, Thomas Hommel
  • Transformer with divided primary winding used in a blocking-oscillator supply circuit
    Patent number: 6150914
    Abstract: A transformer includes a divided primary winding in an isolating transformer power supply circuit and a secondary winding between the parts of the primary winding, a magnetic core having an air gap, and a bobbin surrounding the core with the individual windings applied to it, the transformer has a row of terminal posts to which the windings are connected is designed so that the primary winding is divided into at least three partial windings. The, the secondary winding that is under the highest load for the longest period of time is divided into at least two partial windings, the partial windings of this load secondary winding are enclosed by two partial windings of the minimum of three partial windings of the primary winding on the bobbin, and optionally one or more additional secondary windings are arranged outside the winding structure of the partial windings of the primary winding and load secondary winding.
    Type: Grant
    Filed: March 3, 1999
    Date of Patent: November 21, 2000
    Assignee: Robert Bosch GmbH
    Inventors: Lothar Borho, Robert Kern, Johann Freundorfer