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A very wide bandwidth constant beamwidth acoustical end-fire line array without side lobes

Authors
Journal
Journal of Sound and Vibration
0022-460X
Publisher
Elsevier
Publication Date
Volume
120
Issue
3
Identifiers
DOI: 10.1016/s0022-460x(88)80227-x
Disciplines
  • Design
  • Musicology
  • Physics

Abstract

A simple technique for maintaining the beamwidth of a transducer constant over a very wide frequency range (over N octaves) is described. An acoustical end-fire line array of five weighted sensors is used to produce a radiation pattern, without side lobes, at frequency F 1. A half-scale model is implemented to give the same directivity pattern at frequency 2 F 1. Two compensation filters, whose frequency responses are derived by imposing the constant beamwidth constraints, are used in the respective array outputs, to produce a constant beamwidth, without side lobes, over the octave. The design process is repeated N times, to obtain an acoustical array without side lobes and with constant beam shape over N octaves.

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