• Scand Audiol Suppl · Jan 1993

    Comparative Study

    Signal processing for hearing impairment.

    • H Levitt, M Bakke, J Kates, A Neuman, T Schwander, and M Weiss.
    • Center for Research in Speech and Hearing Sciences, Graduate School, City University of New York, NY 10036.
    • Scand Audiol Suppl. 1993 Jan 1;38:7-19.

    AbstractFour noise reduction methods for use in sensory aids for hearing impairment were evaluated. These include a two-microphone adaptive noise canceller, short-term Wiener filtering, a transformed spectrum subtraction technique, and sinusoidal modelling. The largest improvements in speech recognition were obtained with the two-microphone adaptive noise canceller in a moderately reverberant room. Significant improvements were also obtained for short-term Wiener filtering for some hearing-impaired subjects. The transformed spectrum-subtraction technique failed to improve performance as the front-end of a hearing aid, but yielded improvements in performance as a preprocessor for the Nucleus Cochlear Implant. Sinusoidal modelling resulted in significant improvements in signal-to-noise ratio, but without a corresponding improvement in speech intelligibility.

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