Physiological assessment of contrast-enhancing frequency shaping and multiband compression in hearing aids

Physiological Measurement
Ian C Bruce

Abstract

Spectral enhancement is now being used in many hearing aids in an attempt to compensate for broadened cochlear filtering. However, spectral enhancement may be counteracted by multiband-compression algorithms designed to compensate for the reduced dynamic range of the impaired cochlea. An alternative scheme for spectral enhancement, contrast-enhancing frequency shaping (CEFS), has been proposed, which results in an improved neural representation of the first and second formants of voiced speech segments in the impaired ear. In this paper, models of the normal and impaired ear are used to assess the compatibility of CEFS with multiband compression. Model auditory nerve responses were assessed under four conditions: (1) unmodified speech presented to a normal ear; (2) amplified, unshaped speech presented to an impaired ear; (3) CEFS speech presented to an impaired ear; and (4) CEFS+multiband-compression speech presented to an impaired ear. The results show that multiband compression does not reduce the benefits of CEFS, and in some cases multiband compression assists in preventing distortion of the neural representation of formants. These results indicate that the combination of contrast-enhancing frequency shaping and multiband c...Continue Reading

References

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Citations

Sep 29, 2006·The Journal of the Acoustical Society of America·Muhammad S A Zilany, Ian C Bruce
Jul 7, 2007·The Journal of the Acoustical Society of America·Muhammad S A Zilany, Ian C Bruce
Jul 11, 2012·Journal of Oncology·Melissa M AlegreKim L O'Neill
Jan 30, 2016·Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism·Christian NaselEwald Moser
Oct 2, 2017·The Journal of the Acoustical Society of America·Dhananjaya GowdaPaavo Alku
Jul 28, 2017·Journal of the Association for Research in Otolaryngology : JARO·Michael R WirtzfeldIan C Bruce

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