tailieunhanh - Báo cáo hóa học: " An Intrinsically Digital Amplification Scheme for Hearing Aids"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: An Intrinsically Digital Amplification Scheme for Hearing Aids | EURASIP Journal on Applied Signal Processing 2005 18 3026-3033 2005 Peter J. Blamey et al. An Intrinsically Digital Amplification Scheme for Hearing Aids Peter J. Blamey Dynamic Hearing Pty Ltd 2 Chapel Street Richmond 3121 Victoria Australia Email pblamey@ David S. Macfarlane Dynamic Hearing Pty Ltd 2 Chapel Street Richmond 3121 Victoria Australia Brenton R. Steele Dynamic Hearing Pty Ltd 2 Chapel Street Richmond 3121 Victoria Australia Email bsteele@ Received 30 April 2004 Revised 23 November 2004 Results for linear and wide-dynamic range compression were compared with a new 64-channel digital amplification strategy in three separate studies. The new strategy addresses the requirements of the hearing aid user with efficient computations on an openplatform digital signal processor DSP . The new amplification strategy is not modeled on prior analog strategies like compression and linear amplification but uses statistical analysis of the signal to optimize the output dynamic range in each frequency band independently. Using the open-platform DSP processor also provided the opportunity for blind trial comparisons of the different processing schemes in BTE and ITE devices of a high commercial standard. The speech perception scores and questionnaire results show that it is possible to provide improved audibility for sound in many narrow frequency bands while simultaneously improving comfort speech intelligibility in noise and sound quality. Keywords and phrases amplification compression hearing instrument ADRO. 1. BACKGROUND Although digital hearing aids have been commercially available since 1995 they have not entirely met the high expectations of most hearing aid users. One of the reasons for this is that analog amplification schemes had already reached a high level of sophistication before digital technology was introduced 1 . Most of the advances in digital signal processing have been in the peripheral features of the .