Title :
An efficient adaptive feedback cancellation for hearing aids
Author :
Park, Young-cheol ; Kim, In-young ; Lee, Sang-min
Author_Institution :
Div. of Inf. Technol., Yonsei Univ., Seoul, South Korea
Abstract :
Howling is very annoying problem to the hearing-aid users and it limits the maximum usable gain of hearing-aid devices. In this paper, we present an efficient feedback cancellation system where a time-varying all-pass filter together with a delay in the forward path is used for decorrelating the input and output signals of the hearing aid plant. The adaptive filter in the hearing aid performs continuous adaptation based on the input signal. The output signal of the hearing aid is processed by a 2nd-order APF whose frequency is varied using a low-frequency modulator. Simulation results show that the proposed algorithm can significantly reduce the weight-vector misalignment with a small delay in the forward path.
Keywords :
adaptive filters; all-pass filters; biological effects of acoustic radiation; decorrelation; delays; feedback; frequency modulation; hearing aids; medical signal processing; 2nd-order adaptive filter; adaptive feedback cancellation; continuous adaptation; delay; forward path; hearing aid plant; hearing-aid users; howling; low-frequency modulator; maximum usable gain; signal decorrelation; simulation results; time-varying all-pass filter; weight-vector misalignment; Adaptive filters; Auditory system; Biomedical engineering; Convergence; Decorrelation; Delay effects; Hearing aids; IIR filters; Information technology; Output feedback;
Conference_Titel :
Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE
Print_ISBN :
0-7803-7789-3
DOI :
10.1109/IEMBS.2003.1279693
