Real-time implementation and performance evaluation of digital control for loudspeakers line arrays

• An approach for the digital control of loudspeakers line arrays is presented.
• The virtual source has desired frequency-independent directivity characteristics.
• Wave field synthesis is exploited for the reproduction of the virtual source.
• The real-time implementation is discussed for its evaluation in real experiments.
• The evaluation is carried out making comparisons with approaches of the literature.

Loudspeakers line arrays are very common reproduction sound systems used in real environments (e.g., theaters, stadiums, cinemas, and conference halls) for synthesizing the directivity characteristics of a linear source. The sound field emitted by a vertical line array can be pointed in a particular direction by using digital signal processing techniques and avoiding any mechanical movements. The approach proposed in this paper to obtain the desired directivity behavior takes advantage of the reproduction of a virtual source with frequency-independent directivity characteristics using wave field synthesis theory and introducing a computational complexity reduction. A full investigation on the performance of the technique has been carried out making comparisons with other approaches proposed in the literature thus providing an overview of the results achievable with digital steering of line arrays.