The Binaural Masking Level Difference as a Function of Frequency, Masker Level and Masking Bandwidth in Normal-Hearing and Hearing-Impaired Listeners
- 1 January 1985
- journal article
- research article
- Published by Taylor & Francis in International Journal of Audiology
- Vol. 24 (1) , 25-31
- https://doi.org/10.3109/00206098509070094
Abstract
Binaural masking level differences (MLDs) were measured for 10 normal-hearing and 10 cochlear-impaired listeners, at 500 and 2 000 Hz. Maskers were either wide-band (approximately 2 000 Hz), or narrow-band (50 Hz). For wide-band maskers the noise pressure spectrum level was 50 dB/Hz, and for the narrow-band maskers the noise levels were 50 and 60 dB/Hz. At 500 Hz the hearing-impaired listeners show abnormally low MLDs in wide-band noise, but not in narrow-band noise. At 2 000 Hz, the hearing-impaired subjects show abnormally low MLDs only in narrow-band noise at the 50 dB/Hz level. The clinical implications of the results are considered. La différence binaurale de niveau de masque en fonction de la fréquence, du niveau de masque et de la largeur de bande du masque chez les sujets normo-entendants et les sourds Les différences binaurales de niveau de masque ont été mesurées à 500 et 2 000 Hz chez 10 sujets normo-entendants et chez 10 sujets à la cochlée atteinte. Les masques étaient soit à large bande (environ 2 000 Hz) soit à bande étroite (50 Hz). Pour les masques à large bande, le niveau du spectre de pression du bruit était de 50 dB/Hz, et pour les masques à bande étroite, de 50 et 60 dB/Hz. A 500 Hz les sujets sourds ont montré des MLDs anormalement faibles dans le bruit à bande large, mais pas dans le bruit à bande étroite. A 2 000 Hz, les sujets sourds ont motitré des MLDs anormalement faibles dans le bruit à bande étroite à 50 dB/Hz. Les implications cliniques de ces résultats sont considérées.Keywords
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