CBT arrays taper drive levels from center to edges for constant beamwidth
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
Category: Factual Claims
Related
- Legendre-tapered drive levels give spherical-cap arrays constant beamwidth with low side lobes (similarity 0.90)
- Legendre-tapered spherical transducer caps achieve constant beamwidth above a cut-off frequency (similarity 0.88)
- CBT arrays achieve constant beamwidth using only level shifts, not complex frequency-dependent processing. (similarity 0.86)
- CBT arrays need only frequency-independent level shifts, unlike conventional line arrays (similarity 0.86)
- Curved, Legendre-shaded line arrays exploit floor reflections to maintain constant beamwidth at all frequencies (similarity 0.85)
- Constant Beamwidth Transducer loudspeakers produce astonishingly uniform sound level across listening distance. (similarity 0.84)
- Constant-beamwidth-transducer speaker arrays hold stable loudness across listening distance (similarity 0.83)
- Constant beamwidth transducers deliver uniform sound levels over large areas (similarity 0.82)
- Curved CBT arrays need no frequency-dependent signal processing (similarity 0.81)
- Edge diffraction sources can be canceled by out-of-phase speakers (similarity 0.80)
- Curved and Legendre-shaded loudspeaker lines use the floor reflection to achieve uniform broadband coverage. (similarity 0.80)
Broader Connections
- Edge diffraction sources can be canceled by out-of-phase speakers
#expands(0.75) — Eric J. Heller, Why You Hear What You Hear- An…, 193 - Higher frequencies focus sound into a narrowing forward beam
#qualifies(0.72) — Toole, Floyd E, Sound reproduction- the acoustics and…, 1009