Patents by Inventor Johannes Wittkowski

Johannes Wittkowski 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).

  • Hearing aid having plural microphones and a microphone switching system
    Patent number: 6327370
    Abstract: A hearing aid apparatus is disclosed that employs both an omnidirectional microphone and at least one directional microphone of at least the first order. The electrical signals output from the directional microphone are supplied to an equalization amplifier which at least partially equalizes the amplitude of the low frequency electrical signal components of the electrical signal with the amplitude of the mid and high frequency electrical signal components of the electrical signals of the directional microphone. A switching circuit accepts the signals output from both the omnidirectional microphone and the directional microphone. The switching circuit connects the signal from the omnidirectional microphone to an input of a hearing aid amplifier when the switching circuit is in a first switching state, and connects the output of the equalization circuit to the hearing aid amplifier input when the switching circuit is in a second switching state.
    Type: Grant
    Filed: July 24, 2000
    Date of Patent: December 4, 2001
    Assignee: Etymotic Research, Inc.
    Inventors: Mead Killion, Fred Waldhauer, Johannes Wittkowski, Richard Goode, Jont Allen
  • Hearing aid having plural microphones and a microphone switching system
    Patent number: 6101258
    Abstract: A hearing aid apparatus is disclosed that employs both an omnidirectional microphone and at least one directional microphone of at least the first order. The electrical signals output from the directional microphone are supplied to an equalization amplifier which at least partially equalizes the amplitude of the low frequency electrical signal components of the electrical signal with the amplitude of the mid and high frequency electrical signal components of the electrical signals of the directional microphone. A switching circuit accepts the signals output from both the omnidirectional microphone and the directional microphone. The switching circuit connects the signal from the omnidirectional microphone to an input of a hearing aid amplifier when the switching circuit is in a first switching state, and connects the output of the equalization circuit to the hearing aid amplifier input when the switching circuit is in a second switching state.
    Type: Grant
    Filed: October 21, 1997
    Date of Patent: August 8, 2000
    Assignee: Etymotic Research, Inc.
    Inventors: Mead Killion, Fred Waldhauer, deceased, Johannes Wittkowski, Richard Goode, Jont Allen
  • Hearing aid having plural microphones and a microphone switching system
    Patent number: 5524056
    Abstract: A hearing aid apparatus is disclosed that employs both an omnidirectional microphone and at least one directional microphone of at least the first order. The electrical signals output from the directional microphone are supplied to an equalization amplifier which at least partially equalizes the amplitude of the low frequency electrical signal components of the electrical signal with the amplitude of the mid and high frequency electrical signal components of the electrical signals of the directional microphone. A switching circuit accepts the signals output from both the omnidirectional microphone and the directional microphone. The switching circuit connects the signal from the omnidirectional microphone to an input of a hearing aid amplifier when the switching circuit is in a first switching state, and connects the output of the equalization circuit to the hearing aid amplifier input when the switching circuit is in a second switching state.
    Type: Grant
    Filed: April 13, 1993
    Date of Patent: June 4, 1996
    Assignee: Etymotic Research, Inc.
    Inventors: Mead Killion, Fred Waldhauer, deceased, Johannes Wittkowski, Richard Goode, Jont Allen