Patents by Inventor Tobias Wurzbacher

Tobias Wurzbacher 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).

  • Patent number: 9824675
    Abstract: A method for suppressing interference noise in an acoustic system with a microphone that generates an input signal and a loudspeaker that generates an acoustic signal which partially feeds back to the microphone. A first intermediate signal is formed along a primary signal path as a function of the input signal, and an output signal is formed via a frequency distortion. The output signal is coupled into a signal feedback path. A second intermediate signal is formed in the signal feedback path via a decorrelation and used as an input value for an adaptive filter. The adaptive filter generates a compensation signal which compensates the input signal. A third intermediate signal is formed from the input signal and/or compensated input signal, which is used as an input value for the adaptive filter. The output signal is fed to the loudspeaker for reproduction.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: November 21, 2017
    Assignee: Sivantos Pte. Ltd.
    Inventors: Tobias Daniel Rosenkranz, Tobias Wurzbacher
  • Publication number: 20170064464
    Abstract: A method suppresses feedback in a hearing instrument. A microphone generates an input signal and a loudspeaker generates an acoustic signal which is partially fed back to the microphone via an acoustic feedback path. An intermediate signal is generated along a main signal path depending on the input signal, and an output signal is formed on the basis of the intermediate signal. A voice activity of a user is monitored, a transfer function of an electro-acoustic closed signal loop formed by the main signal path and the feedback path is estimated, that, depending on the transfer function of the closed signal loop and the voice activity of the user, the intermediate signal is decorrelated to form the output signal. A compensation signal is generated from the output signal and is fed to the input signal for feedback compensation, and the output signal is fed to the loudspeaker for reproduction.
    Type: Application
    Filed: September 1, 2016
    Publication date: March 2, 2017
    Inventors: TOBIAS DANIEL ROSENKRANZ, TOBIAS WURZBACHER
  • Publication number: 20160260423
    Abstract: A method for suppressing interference noise in an acoustic system with a microphone that generates an input signal and a loudspeaker that generates an acoustic signal which partially feeds back to the microphone. A first intermediate signal is formed along a primary signal path as a function of the input signal, and an output signal is formed via a frequency distortion. The output signal is coupled into a signal feedback path. A second intermediate signal is formed in the signal feedback path via a decorrelation and used as an input value for an adaptive filter. The adaptive filter generates a compensation signal which compensates the input signal. A third intermediate signal is formed from the input signal and/or compensated input signal, which is used as an input value for the adaptive filter. The output signal is fed to the loudspeaker for reproduction.
    Type: Application
    Filed: March 7, 2016
    Publication date: September 8, 2016
    Inventors: TOBIAS DANIEL ROSENKRANZ, TOBIAS WURZBACHER
  • Patent number: 9398380
    Abstract: Feedback whistling and external tonal signals are distinguished during feedback suppression. For that purpose an adaptation increment of an adaptive filter of a hearing apparatus for feedback reduction is controlled. A sound signal is picked up by a microphone and a microphone signal is output, from which an earpiece signal for an earpiece is generated. An adaptive filter reduces a feedback signal in the microphone signal. To this end an autocorrelation value of sampled values of the microphone signal, between which a time difference exists, is obtained, and the adaptation increment of the adaptive filter is controlled based on the autocorrelation value. A frequency of an output signal obtained on the basis of the microphone signal is shifted while creating the earpiece signal and the time difference for obtaining the autocorrelation value is controlled as a function of the shifting of the frequency of the microphone signal.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: July 19, 2016
    Assignee: Sivantos Pte. Ltd.
    Inventors: Tobias Daniel Rosenkranz, Tobias Wurzbacher
  • Patent number: 9357301
    Abstract: Acoustic feedback in an audio device is reduced or eliminated via a feedback compensator. The feedback compensator disposes of at least one adaptive filter whose adaptation is governed by a step-size parameter ?. A step-size parameter ? of the adaptive filter is set at a high level to eliminate acoustic feedback and the parameter ? is decreased when a critical excitation signal is detected. This way to proceed allows for efficient elimination of feedback whistling while required environment signals are retained.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: May 31, 2016
    Assignee: Sivantos Pte. Ltd.
    Inventors: Sebastian Pape, Tobias Wurzbacher
  • Publication number: 20160080875
    Abstract: A method and apparatus reduce feedback in a hearing aid. The method involves a first transfer function, which includes a feedback path, being estimated for a first section of a signal response. A power of a feedback signal from a second transfer function of the feedback path is estimated for a second section of the signal response, and a parameter of the signal processing device and/or of the feedback suppression unit is adjusted on the basis of the estimated power.
    Type: Application
    Filed: September 17, 2015
    Publication date: March 17, 2016
    Inventors: TOBIAS DANIEL ROSENKRANZ, TOBIAS WURZBACHER
  • Publication number: 20160057548
    Abstract: A method for suppressing acoustic feedback in a hearing aid device and a corresponding device and a system. A frequency range to be transmitted by the hearing aid device is divided into two frequency ranges that are separated by a split-band frequency. A transfer function of a feedback path is estimated in a frequency range and assessed for its behavior at the split-band frequency. Depending on the result of the assessment, the split-band frequency is lowered or raised and in the upper frequency range a phase and/or frequency change is applied for suppressing feedback.
    Type: Application
    Filed: August 20, 2015
    Publication date: February 25, 2016
    Inventors: TOBIAS WURZBACHER, TOBIAS DANIEL ROSENKRANZ, STEFAN PETRAUSCH
  • Publication number: 20160037269
    Abstract: A method and an apparatus reduce feedback in a hearing aid device. The method includes the step of acquiring a first feedback transfer function at a first point in time on a feedback path from a signal processing device via an electro-acoustic transducer, an acoustic signal path from the electro-acoustic transducer to an acousto-electric transducer and via the acousto-electric transducer back to the signal processing device. In a further step, a weighted mean value function is determined in a manner dependent on amplitude absolute values of the first feedback transfer function. A second feedback transfer function is estimated by an adaptive filter, wherein coefficients of the adaptive filter are determined in a manner dependent on the weighted mean value function. The adaptive filter is applied to a signal which is derived from an acoustic input signal of the acousto-electric transducer.
    Type: Application
    Filed: August 3, 2015
    Publication date: February 4, 2016
    Inventors: HENNING PUDER, TOBIAS DANIEL ROSENKRANZ, TOBIAS WURZBACHER
  • Publication number: 20140321683
    Abstract: Feedback whistling and external tonal signals are distinguished during feedback suppression. For that purpose an adaptation increment of an adaptive filter of a hearing apparatus for feedback reduction is controlled. A sound signal is picked up by a microphone and a microphone signal is output, from which an earpiece signal for an earpiece is generated. An adaptive filter reduces a feedback signal in the microphone signal. To this end an autocorrelation value of sampled values of the microphone signal, between which a time difference exists, is obtained, and the adaptation increment of the adaptive filter is controlled based on the autocorrelation value. A frequency of an output signal obtained on the basis of the microphone signal is shifted while creating the earpiece signal and the time difference for obtaining the autocorrelation value is controlled as a function of the shifting of the frequency of the microphone signal.
    Type: Application
    Filed: April 24, 2014
    Publication date: October 30, 2014
    Applicant: SIEMENS MEDICAL INSTRUMENTS PTE. LTD.
    Inventors: TOBIAS DANIEL ROSENKRANZ, TOBIAS WURZBACHER
  • Publication number: 20140314252
    Abstract: Acoustic feedback in an audio device is reduced or eliminated via a feedback compensator. The feedback compensator disposes of at least one adaptive filter whose adaptation is governed by a step-size parameter p. A step-size parameter p of the adaptive filter is set at a high level to eliminate acoustic feedback and the parameter p is decreased when a critical excitation signal is detected. This way to proceed allows for efficient elimination of feedback whistling while required environment signals are retained.
    Type: Application
    Filed: October 17, 2012
    Publication date: October 23, 2014
    Applicant: SIEMENS MEDICAL INSTRUMENTS PTE. LTD.
    Inventors: Sebastian Pape, Tobias Wurzbacher
  • Patent number: 8861759
    Abstract: A method is provided for adapting a feedback suppression device of a hearing device to a given situation in order to improve the quality of feedback suppression in hearing devices and in hearing aids in particular. In the method an adaptation procedure of the feedback suppression device is periodically activated and adaptation of the feedback suppression device is performed regularly even if a feedback detector does not detect a feedback situation. A feedback suppression device for a hearing device is also provided.
    Type: Grant
    Filed: November 5, 2012
    Date of Patent: October 14, 2014
    Assignee: Siemens Medical Instruments Pte. Ltd.
    Inventors: Sebastian Pape, Tobias Wurzbacher
  • Patent number: 8848953
    Abstract: A method for the operation of a hearing device with at least one receiver includes carrying out a fixed second frequency shift of an electrical receiver signal supplying the receiver or of a predefinable frequency range of the receiver signal and a variable first frequency shift of the receiver signal or of a predefinable frequency range of the receiver signal. The first frequency shift is changed depending on the occurring feedback. A frequency shift which effectively prevents feedback is advantageously carried out, while artifacts of the frequency shift are minimized.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: September 30, 2014
    Assignee: Siemens Medical Instruments Pte. Ltd.
    Inventors: Sebastian Pape, Tobias Wurzbacher, Stefan Petrausch, Ulrich Kornagel
  • Patent number: 8737656
    Abstract: A hearing device has a signal-processing apparatus for processing an input signal into an output signal, and a feedback-canceller apparatus for reducing feedback artifacts on the basis of the input signal and the output signal. The feedback-canceller apparatus has an adaptive, first filter, for establishing a set of filter coefficients for a predefined feedback situation. The feedback-canceller apparatus is configured to store the set of filter coefficients. It has at least one second filter, which can be operated directly parallel to the first filter on the basis of the stored set of filter coefficients. The adaptive, first filter can be continuously adapted to a current feedback situation, and the feedback-canceller apparatus is configured such that in the current feedback situation it automatically selects either the first or the second filter. As a result, it generally only requires a simple switchover, but not a complete adaptation.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: May 27, 2014
    Assignee: Siemens Medical Instruments Pte. Ltd.
    Inventors: Sebastian Pape, Stefan Petrausch, Tobias Wurzbacher
  • Patent number: 8442245
    Abstract: A hearing device with a plurality of microphones is intended to be able to be continued to be operated sensibly, even if a microphone fails. Therefore, a hearing device, and in particular a hearing aid, is proposed which provides a decision unit for deciding whether one of the microphones is defective, and a signal processing unit for processing the signals from the microphones using a plurality of processing algorithms. The signal processing unit switches from a first one of the processing algorithms to a second one of the processing algorithms if a decision is made in the decision unit that one of the microphones is defective. In particular, if a microphone fails, automatic switching from directional microphone operation into omnidirectional operation is for example made possible.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: May 14, 2013
    Assignee: Siemens Medical Instruments Pte. Ltd.
    Inventors: Tobias Wurzbacher, Matthias Fröhlich
  • Publication number: 20130108094
    Abstract: A method for the operation of a hearing device with at least one receiver includes carrying out a fixed second frequency shift of an electrical receiver signal supplying the receiver or of a predefinable frequency range of the receiver signal and a variable first frequency shift of the receiver signal or of a predefinable frequency range of the receiver signal. The first frequency shift is changed depending on the occurring feedback. A frequency shift which effectively prevents feedback is advantageously carried out, while artifacts of the frequency shift are minimized.
    Type: Application
    Filed: June 28, 2011
    Publication date: May 2, 2013
    Applicant: SIEMENS MEDICAL INSTRUMENTS PTE. LTD.
    Inventors: Sebastian Pape, Tobias Wurzbacher, Stefan Petrausch, Ulrich Kornagel
  • Publication number: 20110211715
    Abstract: A hearing device has a signal-processing apparatus for processing an input signal into an output signal, and a feedback-canceller apparatus for reducing feedback artifacts on the basis of the input signal and the output signal. The feedback-canceller apparatus has an adaptive, first filter, for establishing a set of filter coefficients for a predefined feedback situation. The feedback-canceller apparatus is configured to store the set of filter coefficients. It has at least one second filter, which can be operated directly parallel to the first filter on the basis of the stored set of filter coefficients. The adaptive, first filter can be continuously adapted to a current feedback situation, and the feedback-canceller apparatus is configured such that in the current feedback situation it automatically selects either the first or the second filter. As a result, it generally only requires a simple switchover, but not a complete adaptation.
    Type: Application
    Filed: February 28, 2011
    Publication date: September 1, 2011
    Applicant: SIEMENS MEDICAL INSTRUMENTS PTE. LTD.
    Inventors: Sebastian Pape, Stefan Petrausch, Tobias Wurzbacher
  • Publication number: 20100189292
    Abstract: A hearing device with a plurality of microphones is intended to be able to be continued to be operated sensibly, even if a microphone fails. Therefore, a hearing device, and in particular a hearing aid, is proposed which provides a decision unit for deciding whether one of the microphones is defective, and a signal processing unit for processing the signals from the microphones using a plurality of processing algorithms. The signal processing unit switches from a first one of the processing algorithms to a second one of the processing algorithms if a decision is made in the decision unit that one of the microphones is defective. In particular, if a microphone fails, automatic switching from directional microphone operation into omnidirectional operation is for example made possible.
    Type: Application
    Filed: December 22, 2009
    Publication date: July 29, 2010
    Applicant: SIEMENS MEDICAL INSTRUMENTS PTE. LTD.
    Inventors: Tobias Wurzbacher, Matthias Fröhlich