Journal
AMERICAN JOURNAL OF AUDIOLOGY
Volume 21, Issue 2, Pages 269-294Publisher
AMER SPEECH-LANGUAGE-HEARING ASSOC
DOI: 10.1044/1059-0889(2012/12-0013)
Keywords
children; evidence-based systematic review; amplitude compression; wide dynamic range compression; compression limiting; amplification
Funding
- ASHA's National Center for Evidence-Based Practice in Communication Disorders
- American Speech-Language-Hearing Association
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Purpose: Two clinical questions were developed: one addressing the comparison of linear amplification with compression limiting to linear amplification with peak clipping, and the second comparing wide dynamic range compression with linear amplification for outcomes of audibility, speech recognition, speech and language, and self- or parent report in children with hearing loss. Method: Twenty-six databases were systematically searched for studies addressing a clinical question and meeting all inclusion criteria. Studies were evaluated for methodological quality, and effect sizes were reported or calculated when possible. Results: The literature search resulted in the inclusion of 8 studies. All 8 studies included comparisons of wide dynamic range compression to linear amplification, and 2 of the 8 studies provided comparisons of compression limiting versus peak clipping. Conclusions: Moderate evidence from the included studies demonstrated that audibility was improved and speech recognition was either maintained or improved with wide dynamic range compression as compared with linear amplification. No significant differences were observed between compression limiting and peak clipping on outcomes (i.e., speech recognition and self-/parent report) reported across the 2 studies. Preference ratings appear to be influenced by participant characteristics and environmental factors. Further research is needed before conclusions can confidently be drawn.
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