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  • 1.
    Arlinger, Stig
    et al.
    Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology. Linköping University, Faculty of Health Sciences.
    Larsby, Birgitta
    Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology. Linköping University, Faculty of Health Sciences.
    Lunner, Thomas
    Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology. Linköping University, Faculty of Health Sciences.
    Hellgren, Johan
    Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology. Linköping University, Faculty of Health Sciences.
    Assessment of speech perception in noise using a conventional speech recognition and a subjective adjustment method.1994Conference paper (Refereed)
  • 2.
    Hellgren, Johan
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology .
    Analysis of feedback cancellation in hearing aids with Filtered-X LMS and the direct method of closed loop identification2002In: IEEE transactions on speech and audio processing, ISSN 1063-6676, E-ISSN 1558-2353, Vol. 10, no 2, p. 119-131Article in journal (Refereed)
    Abstract [en]

    Feedback cancellation in hearing aids based on Filtered-X LMS is analyzed. The data used for identification of the feedback path is the output and input signals of the hearing aid. The identification is thus done in closed loop. Tracking characteristics and bias of the optimal estimate are discussed. The optimal estimate can be biased when the identification is performed in closed loop and the input signal to the hearing aid is not white. It is shown that the bias could be avoided if the spectrum of the input signal was known and the data used to update the internal feedback is prefiltered. The effects of different choices of the design variables of the Filtered-X LMS are discussed. Three alternatives of the fixed filter were evaluated on feedback paths of hearing aids on human subjects and with alternative spectra of the input signal. The optimal estimate of the Filtered-X LMS with an individually adjusted fixed filter showed the best agreement with the desired estimate.

  • 3.
    Hellgren, Johan
    et al.
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion.
    Forsell, Urban
    Bias of feedback cancellation algorithms in hearing aids based on direct closed loop identification2001In: IEEE transactions on speech and audio processing, ISSN 1063-6676, E-ISSN 1558-2353, Vol. 9, no 8, p. 906-913Article in journal (Refereed)
    Abstract [en]

    The undesired effects of acoustic feedback of hearing aids can be reduced with an internal feedback path that is an estimate of the external feedback path. This paper analyzes the limiting estimate of the feedback for feedback cancellation schemes that apply some recursive prediction error method with a quadratic norm, e.g., least mean square (LMS) and recursive least squares (RLS), to the output and input signals of the hearing aid to identify the feedback path. The data used for identification is then collected in closed loop and the estimate used in one recursion will affect the data used in succeeding recursions. These properties have to be considered in the analysis. The analysis shows that the limiting estimate may be biased if there is an error in the used model of the input signal to the hearing aid, and that the system is not identifiable unless a second input signal to the system is added to the output of the hearing aid or the signal processing of the hearing aid used to modify the signal to the impaired ear is nonlinear. The limiting estimate is presented as the solution to an optimization problem in the frequency domain. An analytical expression of the limiting estimate is presented for a special case. For other cases an algorithm is presented that can be used to find a numerical solution. The results can be useful when the model structure used with the recursive identification is chosen.

  • 4.
    Hellgren, Johan
    et al.
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
    Lunner, Thomas
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
    Arlinger, Stig
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
    System identification of feedback in hearing aids.1999In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 105, p. 3481-3496Article in journal (Refereed)
  • 5.
    Hellgren, Johan
    et al.
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
    Lunner, Thomas
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
    Arlinger, Stig
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
    Variations in the feedback of hearing aids.1999In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 106, p. 2821-2833Article in journal (Refereed)
  • 6.
    Larsby, Birgitta
    et al.
    Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology. Linköping University, Faculty of Health Sciences.
    Johansson, Magnus
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology.
    Hellgren, Johan
    Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology. Linköping University, Faculty of Health Sciences.
    STAF i Örebro: Certifierade ingenjörer och skolan i centrum.2001In: Audio Nytt, ISSN 0347-6308, Vol. 28, p. 25-27Article in journal (Other (popular science, discussion, etc.))
  • 7.
    Lunner, Thomas
    et al.
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
    Hellgren, Johan
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
    Arlinger, Stig
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
    Elberling, Claus
    A digital filterbank hearing aid: Predicting user preference and performance for two signal processing algorithms1997In: Ear and Hearing, ISSN 0196-0202, E-ISSN 1538-4667, Vol. 18, p. 12-25Article in journal (Refereed)
  • 8.
    Lunner, Thomas
    et al.
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
    Hellgren, Johan
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
    Arlinger, Stig
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
    Elberling, Claus
    A digital filterbank hearing aid: Three digital signal processing algorithms-User preference and performance1997In: Ear and Hearing, ISSN 0196-0202, E-ISSN 1538-4667, Vol. 18, p. 373-387Article in journal (Refereed)
    Abstract [en]

        

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