Sennheiser E 945 - 03-06 User Manual download pdf (Page 138)

Deutsche Gesellschaft für auDioloGie e. V.274 275

AbstrActs

18. JAhrestAgung „MultidisziplinArität in der Audiologie“

Beitrag wird präsentiert am 07.03.2015 um 11.00 Uhr im Rahmen der FV14

Speech intelligibility in noise with time varying interaural phase

C. Hauth, T. Brand

Medizinische Physik and Cluster of Excellence “Hearing4All”, Universität Oldenburg, 26111

Oldenburg

Interaural differences between target speech and interfering noise can substantially improve

speech intelligibility. In this study, the effect of time-varying interaural phase differences of a

noise on speech intelligibility is investigated. For this purpose, binaural speech intelligibility

experiments using the Oldenburg sentence test in noise (OLSA) are designed and conducted

by 10 normal-hearing subjects. The interaural phase of the noise is sinusoidally modulated

with frequencies of 0, 0.25, 0.5, 1, 2, 4, 8, 16, 32, and 64 Hz. The noise is perceived as moving

from left to right within the head. The same experiment is conducted using a binaural speech

intelligibility model (BSIM) (Beutelmann et al., 2010), which combines an EC mechanism (Dur-

lach, 1963) and the speech intelligibility index (SII) (ANSI, 1997). This model estimates and

compensates for interaural time differences (ITDs) and interaural level differences (ILDs) based

on short time segments of the mixed signals. A signiﬁcant effect of time varying masker phase

on speech intelligibility can be observed. The effect is largest for a frequency of 0.25 Hz,

where speech reception thresholds are decreased by 3 dB compared to the diotic presenta-

tion of speech and noise. This effect gradually decreases as the frequency is increased. So

far, the short-time model was not able to predict the results as the effect is overestimated for

higher modulation frequencies. By adding a component that accounts for binaural sluggish-

ness in the EC mechanism, the predicted results are improved. The best prediction is obtained

with an EC time constant of 100ms.

Beitrag wird präsentiert am 07.03.2015 um 11.12 Uhr im Rahmen der FV14

Assessing the effects of hearing aid conditions, hearing aid use, and linguistic

complexity using an audio-visual ‘online’ measure of speech-in-noise processing

J. Habicht, B. Kollmeier, T. Neher

Universität Oldenburg

Objective:

To assess the effects of noise reduction and high-frequency audibility on how quickly a partici-

pant can grasp the meaning of sentence-in-noise stimuli using an audio-visual test paradigm.

To also assess the effects of linguistic complexity, age, hearing loss, cognitive function, and

hearing aid (HA) experience.

Design:

Repeated-measures design with HA experience as between-subject factor. HA conditions in-

cluded a common clinical prescriptive procedure (‘NAL-R’), NAL-R with single-microphone

noise reduction (NR), and linear ampliﬁcation ensuring audibility (≥15 dB sensation level) of the

speech stimuli up to at least 4 kHz for each individual listener.

Study Sample: 30 elderly hearing-impaired participants, 15 of whom were habitual HA users

while the other 15 had no HA experience. The two groups were matched in terms of age, hear-

ing loss, and working memory capacity.

Results:

NR caused longer response times under conditions of low linguistic complexity. Consistent

with previous ﬁndings, response times increased with linguistic complexity and decreased

with HA experience.

Conclusions:

Single-microphone NR can interfere with elderly HA users’ ability to comprehend speech in

complex environments. Follow-up research should conﬁrm the seemingly positive effect of HA

experience on the ability to comprehend speech quickly.

1 2 ... 133 134 135 136 137 138 139 140 141 142 143 ... 155 156

Comments to this Manuals

No comments

Sennheiser E 945 - 03-06 User Manual Page 138

Comments to this Manuals

Related products and manuals for Unknown Sennheiser E 945 - 03-06