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Benefit From Directional Microphone Hearing Aids: Objective and Subjective Evaluations.

Park HS, Moon IJ, Jin SH, Choi JE, Cho YS, Hong SH - Clin Exp Otorhinolaryngol (2015)

Bottom Line: Correlation analysis of factors influencing DIR benefit was accomplished.Any individual factors did not significantly affect subjective and objective DIR benefits.Factors influencing individual variation in perceptual DIR benefit were still hard to explain.

View Article: PubMed Central - PubMed

Affiliation: Hearing Research Laboratory, Samsung Medical Center, Seoul, Korea.

ABSTRACT

Objectives: The aims of this study were to find and compare the effect of directional (DIR) processing of two different hearing aids via both subjective and objective methods, to determine the association between the results of the subjective and objective evaluations, and to find out individual predictive factors influencing the DIR benefit.

Methods: Twenty-six hearing aid users fitted unilaterally with each two different experimental hearing aid performed modified Korean Hearing in Noise Test (K-HINT) in three DIR conditions; omnidirectional (OMNI) mode, OMNI plus noise reduction feature, fixed DIR mode. In order to determine benefits from DIR benefit within a hearing aid and compare performance of the DIR processing between hearing aids, a subjective questionnaire was administrated on speech quality (SQ) and discomfort in noise (DN) domain. Correlation analysis of factors influencing DIR benefit was accomplished.

Results: Benefits from switching OMNI mode to DIR mode within both hearing aids in K-HINT were about 2.8 (standard deviation, 3.5) and 2.1 dB SNR (signal to ratio; SD, 2.5), but significant difference in K-HINT results between OMNI and OMNI plus noise reduction algorithm was not shown. The subjective evaluation resulted in the better SQ and DN scores in DIR mode than those in OMNI mode. However, the difference of scores on both SQ and DN between the two hearing aids with DIR mode was not statistically significant. Any individual factors did not significantly affect subjective and objective DIR benefits.

Conclusion: DIR benefit was found not only in the objective measurement performed in the laboratory but also in the subjective questionnaires, but the subjective results was failed to have significant correlation with the DIR benefit obtained in the K-HINT. Factors influencing individual variation in perceptual DIR benefit were still hard to explain.

No MeSH data available.


Related in: MedlinePlus

Signal to noise ratio (dB SNR) of Korean hearing-in-noise test as a function of each test condition measured in hearing aid A and hearing aid B. The conditions were classified under 4 heads; omnidirectional (OMNI) mode, OMNI mode plus noise reduction (NR), directional (DIR) mode, and benefit from switching OMNI mode to DIR mode. Error bars indicate ±1 SD about the mean across subjects.
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Figure 2: Signal to noise ratio (dB SNR) of Korean hearing-in-noise test as a function of each test condition measured in hearing aid A and hearing aid B. The conditions were classified under 4 heads; omnidirectional (OMNI) mode, OMNI mode plus noise reduction (NR), directional (DIR) mode, and benefit from switching OMNI mode to DIR mode. Error bars indicate ±1 SD about the mean across subjects.

Mentions: For hearing aid A, the K-HINT thresholds (dB SNR) in OMNI mode, OMNI mode plus noise reduction, and DIR mode were 5.4 (SD, 5.5), 5.0 (SD, 5.1), and 2.6 dB SNR (SD, 6.1) while the K-HINT results for hearing aid B were 3.9 (SD, 5.8), 3.9 (SD, 5.0), and 1.9 dB SNR (SD, 4.8), as described in Fig. 2. The amount of DIR benefit in both hearing aids was not statistically different. Two-way ANOVA with repeated measures was performed on K-HINT results with within-subject factors; (1) instrument and (2) DIR mode condition. Results showed that K-HINT performances were significantly affected by instrument [F(1, 25)=5.68, P<0.05] and DIR mode condition [F(1.59, 39.86)=21.30, P<0.01], but it appeared no interaction between the two factors. Results from Bonferroni-adjusted multiple paired-comparisons revealed that K-HINT performance was significantly improved (P<0.01) when switching OMNI mode to DIR mode even though the results were similar in both OMNI mode and OMNI mode plus noise reduction condition. The post hoc paired-sample t-tests indicated that hearing aid B brought significantly better SNRs (in OMNI mode) than hearing aid A on average, but it showed nonsignificant difference in DIR mode.


Benefit From Directional Microphone Hearing Aids: Objective and Subjective Evaluations.

Park HS, Moon IJ, Jin SH, Choi JE, Cho YS, Hong SH - Clin Exp Otorhinolaryngol (2015)

Signal to noise ratio (dB SNR) of Korean hearing-in-noise test as a function of each test condition measured in hearing aid A and hearing aid B. The conditions were classified under 4 heads; omnidirectional (OMNI) mode, OMNI mode plus noise reduction (NR), directional (DIR) mode, and benefit from switching OMNI mode to DIR mode. Error bars indicate ±1 SD about the mean across subjects.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4553354&req=5

Figure 2: Signal to noise ratio (dB SNR) of Korean hearing-in-noise test as a function of each test condition measured in hearing aid A and hearing aid B. The conditions were classified under 4 heads; omnidirectional (OMNI) mode, OMNI mode plus noise reduction (NR), directional (DIR) mode, and benefit from switching OMNI mode to DIR mode. Error bars indicate ±1 SD about the mean across subjects.
Mentions: For hearing aid A, the K-HINT thresholds (dB SNR) in OMNI mode, OMNI mode plus noise reduction, and DIR mode were 5.4 (SD, 5.5), 5.0 (SD, 5.1), and 2.6 dB SNR (SD, 6.1) while the K-HINT results for hearing aid B were 3.9 (SD, 5.8), 3.9 (SD, 5.0), and 1.9 dB SNR (SD, 4.8), as described in Fig. 2. The amount of DIR benefit in both hearing aids was not statistically different. Two-way ANOVA with repeated measures was performed on K-HINT results with within-subject factors; (1) instrument and (2) DIR mode condition. Results showed that K-HINT performances were significantly affected by instrument [F(1, 25)=5.68, P<0.05] and DIR mode condition [F(1.59, 39.86)=21.30, P<0.01], but it appeared no interaction between the two factors. Results from Bonferroni-adjusted multiple paired-comparisons revealed that K-HINT performance was significantly improved (P<0.01) when switching OMNI mode to DIR mode even though the results were similar in both OMNI mode and OMNI mode plus noise reduction condition. The post hoc paired-sample t-tests indicated that hearing aid B brought significantly better SNRs (in OMNI mode) than hearing aid A on average, but it showed nonsignificant difference in DIR mode.

Bottom Line: Correlation analysis of factors influencing DIR benefit was accomplished.Any individual factors did not significantly affect subjective and objective DIR benefits.Factors influencing individual variation in perceptual DIR benefit were still hard to explain.

View Article: PubMed Central - PubMed

Affiliation: Hearing Research Laboratory, Samsung Medical Center, Seoul, Korea.

ABSTRACT

Objectives: The aims of this study were to find and compare the effect of directional (DIR) processing of two different hearing aids via both subjective and objective methods, to determine the association between the results of the subjective and objective evaluations, and to find out individual predictive factors influencing the DIR benefit.

Methods: Twenty-six hearing aid users fitted unilaterally with each two different experimental hearing aid performed modified Korean Hearing in Noise Test (K-HINT) in three DIR conditions; omnidirectional (OMNI) mode, OMNI plus noise reduction feature, fixed DIR mode. In order to determine benefits from DIR benefit within a hearing aid and compare performance of the DIR processing between hearing aids, a subjective questionnaire was administrated on speech quality (SQ) and discomfort in noise (DN) domain. Correlation analysis of factors influencing DIR benefit was accomplished.

Results: Benefits from switching OMNI mode to DIR mode within both hearing aids in K-HINT were about 2.8 (standard deviation, 3.5) and 2.1 dB SNR (signal to ratio; SD, 2.5), but significant difference in K-HINT results between OMNI and OMNI plus noise reduction algorithm was not shown. The subjective evaluation resulted in the better SQ and DN scores in DIR mode than those in OMNI mode. However, the difference of scores on both SQ and DN between the two hearing aids with DIR mode was not statistically significant. Any individual factors did not significantly affect subjective and objective DIR benefits.

Conclusion: DIR benefit was found not only in the objective measurement performed in the laboratory but also in the subjective questionnaires, but the subjective results was failed to have significant correlation with the DIR benefit obtained in the K-HINT. Factors influencing individual variation in perceptual DIR benefit were still hard to explain.

No MeSH data available.


Related in: MedlinePlus