The Application of Broadband Constant Beamwidth Transducer (CBT) Theory to Loudspeaker Arrays

Keele J,DB(. The Application of Broadband Constant Beamwidth Transducer (CBT) Theory to Loudspeaker Arrays. In: AES Convention 109. Audio Engineering Society; 2000. Paper 5216. Available from: https://aes.org/publications/elibrary-page/?id=9122

@inproceedings{Keele2000_9122,
  author = {Keele, Jr., D. B. (Don)},
  title = {{The Application of Broadband Constant Beamwidth Transducer (CBT) Theory to Loudspeaker Arrays}},
  booktitle = {AES Convention 109},
  note = {Paper 5216},
  year = {2000},
  month = sep,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=9122}
}

TY  - CPAPER
TI  - The Application of Broadband Constant Beamwidth Transducer (CBT) Theory to Loudspeaker Arrays
AU  - Keele, Jr., D. B. (Don)
T2  - AES Convention 109
M1  - Paper 5216
PY  - 2000
DA  - 2000/09/06
UR  - https://aes.org/publications/elibrary-page/?id=9122
PB  - Audio Engineering Society
LA  - en
AB  - A brief tutorial review of Constant Beamwidth Theory (CBT), as first developed by the military for underwater transducers (JASA, 1978 July and 1983 June), is described. In this paper the transducer is a circular spherical cap of arbitrary half-angle with Legendre function shading. This provides a constant beam pattern and directivity with extremely low side lobes for all frequencies above a certain cutoff frequency. This paper extends the theory by simulation to discrete-source loudspeaker arrays, including: 1) circular wedge line arrays of arbitrary sector angle, which provide controlled coverage in one plane only; 2) circular spherical caps of arbitrary half-angle, which provide controlled axially symmetric coverage; and 3) elliptical toroidal caps, which provide controlled coverage for arbitrary and independent vertical and horizontal angles.:
ER  -