Insights on Smart Digital Loudspeaker Arrays and Design

41. Comments on Smart Digital Loudspeaker Arrays

Letters to the Editor, J. Audio Eng. Soc., vol. 54, no. 12, pp. 1203-1214 (December 2006).

I read with much interest Malcolm Hawksford’s above paper on the design and implementation of what he terms “micro drive unit” loudspeaker arrays, which provide constant-beamwidth sound radiation. The paper’s FIR-filter-based design procedure for the driver transfer functions was very useful and informative, particularly given that the array can be designed to provide multiple beams of arbitrary size and direction.

However, he analyzed only one type of array and did not provide any references to past work concerning the design of line arrays that provide broad-band constant-beamwidth radiation. No mention was made of other design methods [1]–[3] or other array types such as log arrays [4] or the so-called “constant-beamwidth transducer” (CBT) arrays [5]–[11], both of which provide wide-band constant-beamwidth acoustic output.

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D. B. (DON) KEELE, JR., AES Fellow
Harman International Industries Martinsville, IN 46151
Letters to the Editor, J. Audio Eng. Soc., vol. 54, no. 12, pp. 1203-1214 (December 2006).

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