Quiz 30.5A
Quiz 30.5a: Benefits of incorporating the adaptive dynamic range optimization amplification scheme into an assistive listening device for people with mild or moderate hearing loss
ABSTRACT: This study investigated whether a self-designed assistive listening device (ALD) that incorporates an
adaptive dynamic range optimization (ADRO) amplification strategy can surpass a commercially available monaurally worn linear ALD, SM100. Both subjective and objective measurements were implemented. Mandarin Hearing-In-Noise Test (MHINT) scores were the objective measurement, whereas
participant satisfaction was the subjective measurement. The comparison was performed in a mixed
design (i.e., subjects’ hearing status being mild or moderate, quiet versus noisy, and linear versus ADRO
scheme). The participants were two groups of hearing-impaired subjects, nine mild and eight moderate,
respectively. The results of the ADRO system revealed a significant difference in the MHINT sentence
reception threshold (SRT) in noisy environments between monaurally aided and unaided conditions,
whereas the linear system did not. The benchmark results showed that the ADRO scheme is effectively
beneficial to people who experience mild or moderate hearing loss in noisy environments. The
satisfaction rating regarding overall speech quality indicated that the participants were satisfied with
the speech quality of both ADRO and linear schemes in quiet environments, and they were more
satisfied with ADRO than they with the linear scheme in noisy environments.
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