Directivity-Customizable Loudspeaker Arrays Using Constant-Beamwidth Transducer (CBT) Overlapped Shading

Feng X, Shen Y, Keele J,DB(, Xia J. Directivity-Customizable Loudspeaker Arrays Using Constant-Beamwidth Transducer (CBT) Overlapped Shading. In: AES Convention 139. Audio Engineering Society; 2015. Paper 9478. Available from: https://aes.org/publications/elibrary-page/?id=18034

@inproceedings{Feng2015_18034,
  author = {Feng, Xuelei and Shen, Yong and Keele, Jr., D.B. (Don) and Xia, Jie},
  title = {{Directivity-Customizable Loudspeaker Arrays Using Constant-Beamwidth Transducer (CBT) Overlapped Shading}},
  booktitle = {AES Convention 139},
  note = {Paper 9478},
  year = {2015},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=18034}
}

TY  - CPAPER
TI  - Directivity-Customizable Loudspeaker Arrays Using Constant-Beamwidth Transducer (CBT) Overlapped Shading
AU  - Feng, Xuelei
AU  - Shen, Yong
AU  - Keele, Jr., D.B. (Don)
AU  - Xia, Jie
T2  - AES Convention 139
M1  - Paper 9478
PY  - 2015
DA  - 2015/10/06
UR  - https://aes.org/publications/elibrary-page/?id=18034
PB  - Audio Engineering Society
LA  - en
AB  - In this work a multiple constant-beamwidth transducer (Multi-CBT) loudspeaker array is proposed that is constructed by applying multiple overlapping CBT Legendre shadings to a circular-arc or straight-line delay-curved multi-acoustic-source array. Because it has been proved theoretically and experimentally that the CBT array provides constant broadband directivity behavior with nearly no side lobes, the Multi-CBT array can provide a directivity-customizable sound field with frequency-independent element weights by sampling and reconstructing the targeted directivity pattern. Various circularly curved Multi-CBT arrays and straight-line, delay-curved Multi-CBT arrays are analyzed in several application examples that are based on providing constant Sound Pressure Level (SPL) on a seating plane, and their performance capabilities are verified. The power of the method lies in the fact only a few easily-adjustable real-valued element weights completely control the shape of the polar pattern that makes matching the polar shape to a specific seating plane very easy. The results indicate that the desired directivity patterns can indeed be achieved.
ER  -