Signal delays can substitute for curved physical geometry in shaping wavefronts

Evidence

Conventional CBT arrays require a driver configuration that conforms to either a spherical-cap curved surface or a circular arc. Keele also showed how CBT arrays can also be implemented in flat-panel or straight-line array configurations using signal delays and Legendre function shading of the driver amplitudes. CBT arrays do not require any signal processing except for simple frequency-independent shifts in loudspeaker level. This is in contrast with conventional constant-beamwidth flatpanel and straight-line designs, which require strongly frequency-dependent signal processing. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2918

Categorization

• XREF: Parallels the tree article’s idea that living root bridges substitute grown structure for built structure — engineered delay substitutes for physical curvature. — connects to: Cabinet edges and centered drivers create diffraction that smooth curves minimize — David Howard, Jamie Angus, coustics and Psychoacoustics, 2217
• SHARE: Send to anyone into line-array PA design — the flat-panel CBT trick is the exact nerdy lore they’d enjoy.