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Sidelobe suppression in loudspeaker line array via sparse optimization
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DOI：10.59400/sv3785.png)
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Abstract
En 中文
Loudspeaker line arrays, widely deployed in venues such as theaters, stadiums, cinemas, and conference halls, are used to achieve uniform sound field coverage and directional control. Due to the spatial sampling effect of the loudspeaker-line-array discrete structure on an ideal continuous line source, periodic sidelobes inevitably appear in the sound radiation directivity pattern, whose pressure level increases with frequency. To mitigate this problem, a sidelobe suppression approach based on sparse array optimization is proposed. To reduce peak side lobe sound pressure levels, particle swarm optimization (PSO) and constrained genetic algorithms (GA) are employed to achieve random sparse optimization of array element positions and sparse optimization of structural symmetry in loudspeaker line array, respectively. Furthermore, due to the increased side lobe sound pressure level after beam steering, a beam steering algorithm combining sparse constraints with an improved Cosh criterion was proposed to achieve effective side lobe suppression following beam steering. This algorithm maintains the sidelobe suppression effect while achieving digital beam steering, allowing the main beam to be directed to a specific direction without requiring mechanical movement. The simulation results indicate that, by sparsifying loudspeaker units, the proposed method effectively suppresses the sidelobe sound pressure levels, with acceptable performance degradation in main-beam gain. In addition, flexible digital beam steering is archived with the sparsely optimized loudspeaker arrays in a low sidelobe level.
Keywords:
loudspeaker line array
sparse array
sidelobe suppression
optimization algorithm
beam steering