Abstract
Instability is a problem with high-power and ITE hearing aids. Gain margins can be improved by 15 dB using an adaptive LMS filter to estimate the feedback characteristic and actively cancel it [Engebretson etal., ‘‘Adaptive feedback stabilization of hearing aids,’’ Second International Workshop on Hearing Impairment and Signal-Processing Hearing Aids, London, England, June 1991]. This algorithm was evaluated with a wearable digital hearing aid (WDHA). Nine hearing-impaired subjects were tested at 55 dB SPL, in quiet and in multitalker babble (6-dB SNR), with their own aid and with the WDHA programmed, with and without feedback stabilization (FBS), to match the REAR of their own aid. Subjects adjusted overall gain to their liking for each condition. Real ear measurements were taken to verify REAR. Correlation of word identification scores (PHFWL) with the subject’s own aid and the WDHA (FBS disabled) was high. With FBS enabled, subjects chose additional gain that ranged from 2 to 10 dB and scores improved by 7 percentage points on the average across subjects. [Work supported by DVA.]
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