다채널 디지털 보청기를 위한 적응 궤환 제거 알고리즘 개발
Development of Adaptive Feedback Cancellation Algorithm for Multi-channel Digital Hearing Aids
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초록
본 연구에서는 다채널 디지털 보청기에서 적용될 수 있는 적응 궤환 제거 알고리즘을 제안하였다. 제안된 적응궤환 제거기는 궤환 검출을 위한 적응 노치 필터와 궤환 제거를 위한 NLMS (normalized least mean square) 적응필터로 구성되어 있다. 제안된 적응 궤환 제거 알고리즘을 다채널 보청 알고리듬과 결합하였다. 다채널 보청 알고리즘은 MDCT(modified discrete cosine transform) 필터뱅크를 이용하여 주파수 대역별 청력손실을 보상하도록 구성하였다. 제안된 알고리즘을 포함한 완성된 보청 알고리즘의 성능을 컴퓨터 시뮬레이션을 통해 평가하였으며 상용 DSP보드를 이용하여 실시간 구현을 확인하였다.
Abstract
In this study, we proposed an adaptive feedback cancellation algorithm for multi-band digital hearing aids. The adaptive feedback canceller (AFC) is composed of an adaptive notch filter (ANF) for feedback detection and an NLMS (normalized least mean square) adaptive filter for feedback cancellation. The proposed feedback cancellation algorithm is combined with a multi-band hearing aid algorithm which employs the MDCT (modified discrete cosine transform) filter bank for the frequency-dependent compensation of hearing losses. The proposed algorithm together with the MDCT-based multi-channel hearing aid algorithm has been evaluated via computer simulations and it has also been implemented on a commercialized DSP board for real-time verifications.
참고문헌 (14)
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