PMID: 11324842Apr 28, 2001Paper

Fitting low ratio compression to people with severe and profound hearing losses

Ear and Hearing
C BarkerP Newall

Abstract

In this study, we aimed to determine the extent to which wide dynamic range compression and compression limiting could benefit severely and profoundly hearing-impaired adults. Subjects were fitted with multi-memory hearing aids incorporating frequency independent input-controlled compression with a 2:1 compression ratio and output-controlled compression limiting. The input compression threshold (CT) was varied to establish the lowest level that maintained audibility for conversational intensity speech without acoustic feedback oscillation. Where a low (40 to 57 dB SPL) CT was possible, this was compared with a moderate (65 to 74 dB SPL) level. The preferred input compression setting was subsequently compared with linear, compression-limited amplification in the same aids. In the three cases where 2:1 input compression could not be used, because of feedback or loudness insufficiency problems, compression limiting was compared with peak clipping. Field trials were conducted over a 2- or 3-mo period to establish preferences. Nine of the 16 subjects preferred the inclusion of the higher level input compression, and one preferred lower level input compression. Four subjects preferred linear, compression-limited amplification, one fa...Continue Reading

References

Apr 30, 1998·Ear and Hearing·P G StelmachowiczB E Hoover
Dec 1, 1996·Trends in Amplification·L E HumesM Barr

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Citations

Dec 5, 2012·International Journal of Audiology·Laura Turton, Pauline Smith
Dec 1, 2002·Trends in Amplification·Pamela E Souza
Mar 28, 2008·Journal of Speech, Language, and Hearing Research : JSLHR·Rebecca L Warner Henning, Ruth A Bentler
Mar 28, 2008·Bioinspiration & Biomimetics·Axel Michelsen, Ole Naesbye Larsen

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