Effects of aging on word intelligibility and listening difficulty in various reverberant fields
Impulse response of the test sound field. Pd and Pr are the sound pressure level of a direct sound and the onset of a reverberation signal, respectively.
Audiogram for listeners used in the listening test. Open circles and two solid lines represent the mean and s.d. of the hearing level of listeners, respectively. Dashed line represents the estimated mean hearing level of listeners by ISO 7029.
Word intelligibility scores as a function of hearing level and a parameter of the sound fields, for each frequency at which the hearing level was measured. The word intelligibility scores and hearing level are the average for the group classified according to hearing level in steps. Different symbols represent different sound fields.
As for Fig. 3, but for listening difficulty ratings.
values of word intelligibility scores for the aged as a function of those for the young for each group classified by the average of hearing levels at 2 and . The word intelligibility scores for the young are obtained by Morimoto et al.
The relation between estimated and measured word intelligibility scores for the aged.
Estimated word intelligibility scores for the aged as a function of word intelligibility scores for the young and as a parameter of hearing level.
As for Fig. 5, but for listening difficulty ratings.
As for Fig. 6, but for listening difficulty ratings.
As for Fig. 7, but for listening difficulty ratings.
Categories of listening difficulty.
The number of listeners for the groups that are classified by hearing level in steps.
F-ratios of the simple main effect of “hearing level” on word intelligibility scores for each sound field. The values were obtained by a repeated measures two-way analysis of variance with “hearing level” and “sound field.” The analyses of variance were performed for the hearing level at each frequency.
As for Table III, but for listening difficulty ratings.
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