Summary: STEADY-STATE ANALYSIS OF CONTINUOUS ADAPTATION SYSTEMS FOR HEARING
AIDS WITH A DELAYED CANCELLATION PATH
Marcio G. Siqueira and Abeer A. Alwan
Department of Electrical Engineering
University of California, Los Angeles
Los Angeles, CA 90095
e-mail: alwan,marcio @icsl.ucla.edu
Acoustic feedback is a phenomenon that is both annoying to hearing-
aid users and reduces the maximum usable gain of hearing-aid de-
vices. To avoid acoustic feedback, continuous adaptation systems
have been proposed in the past. This paper studies analytically,
for the first time, the steady-state convergence behavior of adap-
tive algorithms when operating in continuous adaptation to reduce
acoustic feedback when delays are used in the cancellation path.
It is shown that an improvement in the adaptive filter estimate is
possible depending on the type of feedback path and on the number
of delays used in the cancellation path.
Keywords: hearing aids, acoustic feedback, adaptive filters.