Legendre shading tapers array drive from maximum at center to zero at the edges.

Evidence

To maintain constant beamwidth behavior, CBT circular-arc loudspeaker line arrays require that the individual transducer drive levels be set according to a continuous Legendre shading function. This shading gradually tapers the drive levels from maximum at the center of the array to zero at the outside edges of the array. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2914

Categorization

• DEFINE: Defines Legendre shading as the specific amplitude-tapering function required for constant beamwidth.