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Restricted Geometry Acoustic Arrays for Highly Directional Patterns by A.A.(Louis) Beex; Victor E. DeBrunner is a Engineering article available to read on EtoBox.

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## A BSTRA CT We consider the design and performance of a restricted geometry. 2-or 4element (termed 'small') acoustic array as a beam former. These arrays are designed to be mobile, for individuals who need to communicate in noisy environments. An acoustic array is made as directional as possible (thus 'forming the beam'), so as to reduce (or eliminate) an), unwanted narrowband acoustic signals which impinge on the array from undesirable directions. The directionality of multi-element arrays, and thus the capability for interference rejection, is greatly superior to that possible with a single-element array. Enhanced directionality comes from the extra knowledge gained when acoustic signals are spatially sampled. 1"2 From intuition, we expect such a result since humans have 2 ears to hear with, and we do not have the 'extra' one merely for redundancy. That we know more about the incoming signal comes at the cost of a higher complexity in handling the signal itself. This added expense includes not only the cost of the added sensors, but also the cost of the interconnections required by the multi-element array. We introduce some measures of directionality, which we use to show that

Who reads Restricted Geometry Acoustic Arrays for Highly Directional Patterns?

Author

A.A.(Louis) Beex; Victor E. DeBrunner

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0003-682X)

Published

1991

Language

EN

Field

Engineering (Physical Sciences)