Title :
Subband adaptive filtering applied to acoustic feedback reduction in hearing aids
Author :
Siqueira, M.G. ; Speece, R. ; Petsalis, E. ; Alwan, A. ; Soli, S. ; Gao, S.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
Acoustic feedback is a problem in hearing aids that contain a substantial amount of gain, such as hearing aids that are used in conjunction with vented or open molds and in-the-ear hearing adds. Acoustic feedback is both annoying and reduces the maximum usable gain of hearing-aid devices. This paper models the time-varying acoustic feedback path for hearing aids before performing a systematic evaluation of acoustic feedback reduction techniques through perceptual experiments. It is shown that by using a subband NLMS adaptive filtering approach, the same performance of wideband NLMS algorithms is obtained with a fraction of the complexity.
Keywords :
acoustic signal processing; adaptive filters; adaptive signal processing; band-pass filters; echo suppression; feedback; filtering theory; hearing aids; least mean squares methods; speech intelligibility; acoustic feedback reduction; complexity; filter bank; gain; hearing aids; in-the-ear hearing; open molds; perceptual experiments; performance; subband NLMS adaptive filtering; time-varying acoustic feedback path; vented molds; wideband NLMS algorithms; Acoustic devices; Acoustic distortion; Acoustic noise; Adaptive filters; Feedback loop; Filtering algorithms; Hearing aids; Microphones; Speech; Wideband;
Conference_Titel :
Signals, Systems and Computers, 1996. Conference Record of the Thirtieth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-8186-7646-9
DOI :
10.1109/ACSSC.1996.601163
