A panel speaker array with omnidirectional radiation pattern is presented in this paper. Array signal-processing techniques are utilized to manipulate the sound beam electronically such that wide-angle radiation can be maintained over a large frequency range. In order to achieve this purpose without sacrificing the array efficiency, the genetic algorithm (GA) is employed in the design stage to calculate the optimal array coefficients. The GA proved to be an effective technique in searching for the array coefficients that maximize the efficiency with desired flatness of radiation pattern. In addition, a modified design is also proposed to further enhance the efficiency in the low frequency range. The resulting designs are implemented on a digital signal processor platform and experimentally verified by using a small $5×1$ panel speaker array and a large $3×3$ panel speaker array.

1.
Bai
,
M. R.
, and
Huang
,
T.
,
2001
, “
Development of Panel Loudspeaker System: Design, Evaluation and Enhancement
,”
J. Acoust. Soc. Am.
,
109
, pp.
2751
2761
.
2.
Johnson, D. F., and Dudgeon, D. F., 1993, Array Signal Processing Concepts and Techniques Prentice Hall, Englewood Cliffs, NJ.
3.
Haupt
,
R. L.
,
1994
, “
Thinned Arrays Using Genetic Algorithms
,”
IEEE Trans. Antennas Propag.
,
42
, pp.
993
999
.
4.
Smith
,
D. L.
,
1997
, “
Discrete-Element Line Arrays: Their Modeling and Optimization
,”
J. Audio Eng. Soc.
,
45
, pp.
949
964
.
5.
Aarts
,
R. M.
, and
Janssen
,
A. J. E. M.
,
2000
, “
On Analytic Design of Loudspeaker Arrays with Uniform Radiation Characteristics
,”
J. Acoust. Soc. Am.
,
107
, pp.
287
292
.
6.
Beenker
,
G. F. M.
,
Claasen
,
T. A. C. M.
, and
Hermens
,
P. W. C.
,
1985
, “
Binary Sequences With a Maximally Flat Amplitude Spectrum
,”
Philips J. Res.
,
40
, pp.
289
304
.
7.
Golay
,
M. J. E.
,
1982
, “
The Merit Factor of Long, Low Autocorrelation Binary Sequences
,”
IEEE Trans. Inf. Theory
,
28
, pp.
543
543
.
8.
Belew, R. K., and Vose, M. D., 1997, Foundations of Genetic Algorithms, Morgan Kaufmann Publishers, New York.
9.
Augspurger
,
G. L.
,
1990
, “
Near-Field and Far-Field Performance of Large Woofer Arrays
,”
J. Audio Eng. Soc.
,
38
, pp.
231
236
.
10.
Meyer
,
D. G.
,
1984
, “
Digital Control of Loudspeaker Array Directivity
,”
J. Audio Eng. Soc.
,
32
, pp.
747
754
.
11.
Oppenheim, A. V., and Schafer, R. W., 1989, Discrete-Time Signal Processing, Prentice Hall, Englewood Cliffs, NJ.
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