Directive loudspeaker elements act as spatial filters reducing array side lobes

Evidence

One way of reducing the effect of spatial aliasing is to use directive loudspeakers instead of point sources as the array elements. If one uses directive sources, their polar patterns will act as a form of spatial filter. That is, the off-axis side lobes will be reduced by the off-axis reduction in sound level that a directive source affords. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2907

Categorization

• XREF: Connects to the spatial-aliasing discussion earlier in this appendix, where point-source arrays produce aliased main lobes above a frequency threshold. — connects to: Directive microphone arrays in hearing aids improve speech intelligibility in noise; Loudspeaker arrays can create private sound zones within one large listening area.; A loudspeaker array’s polar pattern is a Fourier transform of its illumination (+1 more)
• corroborated: 2 independent passages support this claim — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2907

Broader Connections

• A loudspeaker array’s polar pattern is a Fourier transform of its illumination #complicates (0.75)