Directivity Control Using Two Circular Loudspeaker Arrays
2019 年 23 巻 4 号 p. 159-162
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2019 年 23 巻 4 号 p. 159-162
In this study, we investigate directivity control using two circular loudspeaker arrays and compare it with those of single circular and linear loudspeaker arrays. The design of the directivity control filter is based on the least-squares method in the frequency domain. Circular loudspeaker arrays are considered to be rigid to avoid the forbidden frequency and for practical use. We compare the beam patterns with different shapes of arrays with a single frequency via computer simulation. These are evaluated by comparing the width of the main lobe and the directivity index. The two circular loudspeaker arrays can form a high-directivity beam with a narrower main lobe than that of the single circular loudspeaker array. The two circular loudspeaker arrays have more robust performances than that of the linear loudspeaker array.
