Practical Implementation of Constant Beamwidth Transducer (CBT) Loudspeaker Circular-Arc Line Arrays

Keele J,DB(. Practical Implementation of Constant Beamwidth Transducer (CBT) Loudspeaker Circular-Arc Line Arrays. In: AES Convention 115. Audio Engineering Society; 2003. Paper 5863. Available from: https://aes.org/publications/elibrary-page/?id=12369

@inproceedings{Keele2003_12369,
  author = {Keele, Jr., D. B. (Don)},
  title = {{Practical Implementation of Constant Beamwidth Transducer (CBT) Loudspeaker Circular-Arc Line Arrays}},
  booktitle = {AES Convention 115},
  note = {Paper 5863},
  year = {2003},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=12369}
}

TY  - CPAPER
TI  - Practical Implementation of Constant Beamwidth Transducer (CBT) Loudspeaker Circular-Arc Line Arrays
AU  - Keele, Jr., D. B. (Don)
T2  - AES Convention 115
M1  - Paper 5863
PY  - 2003
DA  - 2003/10/06
UR  - https://aes.org/publications/elibrary-page/?id=12369
PB  - Audio Engineering Society
LA  - en
AB  - 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. This paper considers approximations to the Legendre shading that both discretize the levels and truncate the extent of the shading so that practical CBT arrays can be implemented. It was determined by simulation that a 3-dB stepped approximation to the shading maintained out to '12 dB did not significantly alter the excellent vertical pattern control of the CBT line array. Very encouraging experimental measurements were exhibited by a pair of passively-shaded prototype CBT arrays using miniature wide-band transducers.
ER  -