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IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, VOL. 8, NO. 4, JULY 2000 443 Steady-State Analysis of Continuous Adaptation
 

Summary: IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, VOL. 8, NO. 4, JULY 2000 443
Steady-State Analysis of Continuous Adaptation
in Acoustic Feedback Reduction Systems for
Hearing-Aids
Marcio G. Siqueira, Member, IEEE, and Abeer Alwan, Member, IEEE
Abstract--Acoustic feedback is a problem in hearing aids
that contain a substantial amount of gain, hearing aids that are
used in conjunction with vented or open molds, and in-the-ear
hearing aids. Acoustic feedback is both annoying and reduces the
maximum usable gain of hearing-aid devices. This paper studies
analytically the steady-state convergence behavior of LMS-based
adaptive algorithms when used in continuous adaptation to reduce
acoustic feedback. A bias is found in the adaptive filter's estimate
of the hearing-aid acoustic feedback path. Methods for reducing
this bias and producing an improved estimate of the acoustic
feedback path are analyzed and compared. It is shown that by the
use of a delay in the forward or cancellation paths of the hearing
aid plant, and for representative feedback paths, it is possible to
reduce this bias by more than 15 dB.
Index Terms--Adaptive filters, feedback, hearing aids.

  

Source: Alwan, Abeer - Electrical Engineering Department, University of California at Los Angeles

 

Collections: Computer Technologies and Information Sciences