CBT arrays need only frequency-independent level shifts, unlike conventional line arrays
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 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 flat-panel and straight-line designs, which require strongly frequency-dependent signal processing. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2902
Categorization
- CANDY: The elegant fact that flat panels can emulate curved-arc behavior with just simple delays and level shifts is a fun engineering tidbit.
Related
- CBT arrays achieve constant beamwidth using only level shifts, not complex frequency-dependent processing. (similarity 0.94)
- Curved CBT arrays need no frequency-dependent signal processing (similarity 0.92)
- Legendre-tapered drive levels give spherical-cap arrays constant beamwidth with low side lobes (similarity 0.85)
- CBT arrays taper drive levels from center to edges for constant beamwidth (similarity 0.84)
- Legendre-tapered spherical transducer caps achieve constant beamwidth above a cut-off frequency (similarity 0.84)
- Curved, Legendre-shaded line arrays exploit floor reflections to maintain constant beamwidth at all frequencies (similarity 0.81)
- Constant-beamwidth-transducer speaker arrays hold stable loudness across listening distance (similarity 0.79)