Patents by Inventor Daniel J. H. Admiraal

Daniel J. H. Admiraal 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).

  • Amplifier with automatic inhibition of acoustic feedback
    Patent number: 4747144
    Abstract: An amplifier for acoustic signals provided with means for suppressing undesired acoustic feedback signals in a rapid manner. The amplifier includes a high-pass filter which separates a part of the signal to be amplified to obtain a control signal for reducing the gain of the amplifier when an acoustic feedback signal is detected. The output of the high-pass filter is connected to a periodicity detector, e.g. a single peak detector, which discriminates between an acoustic feedback signal having a regular periodicity and a signal having an irregular character, such as noise or speech. The control signal is derived from the output of the periodicity detector.
    Type: Grant
    Filed: March 20, 1985
    Date of Patent: May 24, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Daniel J. H. Admiraal, Benjamin Lopes Cardozo
  • Amplifier arrangement for acoustic signals, provided with means for suppressing (undersired) spurious signals
    Patent number: 4525856
    Abstract: An amplifier for acoustic signals provided with means for suppressing undersired acoustic feedback signals in a rapid manner. The amplifier includes a high-pass filter which separates a part of the signal to be amplified to obtain a control signal for reducing the gain of the amplifier when an acoustic feedback signal is detected. The output of the high-pass filter is connected to a periodicity detector, e.g. a single peak detector, which discriminates between an acoustic feedback signal having a regular periodicity and a signal having an irregular character, such as noise or speech. The control signal is derived from the output of the periodicity detector.
    Type: Grant
    Filed: January 24, 1979
    Date of Patent: June 25, 1985
    Assignee: U.S. Philips Corporation
    Inventors: Daniel J. H. Admiraal, Benjamin Lopes Cardozo