Journal
INTERNATIONAL JOURNAL OF AUDIOLOGY
Volume 46, Issue 6, Pages 293-308Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14992020601188591
Keywords
transposition hearing loss; dead region; hearing aid; consonant recognition
Funding
- MRC [G8717539] Funding Source: UKRI
- Medical Research Council [G8717539] Funding Source: researchfish
- Medical Research Council [G8717539] Funding Source: Medline
- RNID [G18] Funding Source: Medline
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Transposition of high-frequency information to lower frequencies may help people with high-frequency hearing loss associated with a 'dead region' (DR) to detect and identify certain consonants, such as 's'. Conventional high-frequency amplification is often not beneficial in such cases. We designed and evaluated a new tiansposition algorithm which was adapted to each subject's highfrequency DR. Frequency components from well within the DR were transposed to just within the DR without applying frequency compression. Low-frequency components were amplified, but unaffected by transposition. Transposition only occurred ifthere was significant highfrequency energy, preventing high-frequency background noise of moderate level from being transposed. Consonant discrimination was tested using vowel-consonantvowel (VCV) stimuli, and the detection of word-final 's' and 'z' was assessed using word pairs. Seven subjects with high-frequency DRs were tested in quiet using a transposed and a control condition. Following transposition, two subjects improved significantly and none performed significantly worse on the VCV-test overall. The peiception of affricates was consistently improved. Averaged across Subjects, the detection of word-final 's' and 'z' was significantly improved, with five subjects improving significantly individually.
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