3D FIR-Based Beam Shaping—Revolution or Evolution

Presenters:
Stefan Feistel, AFMG - Berlin, Germany
Scott Leslie, PD Squared - Irvine, CA USA

In this session we discuss backgrounds and trends of FIR-based coverage optimization. After the era of conventional beam steering, for modern line arrays it is nowadays almost a standard to tailor radiation patterns precisely to the venue. This technology uses simulated FIR filters in order to optimize SPL uniformity, create avoidance zones, and improve speech intelligibility. However, the next level of sound field control is already looming: Horizontal arrays as well as modular planar systems with steering capabilities are being designed and tested. The talk outlines important aspects of horizontal and 3D coverage control using FIR filter optimization and demonstrates their capabilities using case studies. We compare these new concepts with the known approaches of classical beam steering and 2D vertical beam shaping. Finally we discuss off-the-shelf availability, hardware and software requirements, as well as computational effort and needed measurement accuracy.