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Summary: 1
Robust Sound Localization in 0.18 µm CMOS
David Halupka, Student Member, IEEE, Nebu John Mathai, Student Member, IEEE,
Parham Aarabi, Member, IEEE, and Ali Sheikholeslami, Senior Member, IEEE
Abstract-- This paper presents a hardware implementation of
a sound localization algorithm that localizes a single sound source
by using the information gathered by two separated microphones.
This is achieved through estimating the time delay of arrival
(TDOA) of sound at the two microphones. We have used a
TDOA algorithm known as the "phase transform" to minimize
the effects of reverberations and noise from the environment.
Simplifications to the chosen TDOA algorithm were made in
order to replace complex operations, such as the cosine function,
with less expensive ones, such as iterative additions. The custom
digital signal processor implementing this algorithm was designed
in a 0.18 µm CMOS process and tested successfully. The test chip
is capable of localizing the direction of a sound source within
2.2
of accuracy, utilizing approximately 30 mW of power and
6.25 mm2
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