Wideband sound reproduction using a massive multi-channel focusing parametric array loudspeaker system.

Generating high-contrast, wideband audio in a confined target area remains challenging for conventional electrodynamic loudspeaker (EDL) arrays due to their large size and complex multi-channel processing. We present a 576-channel focusing parametric array loudspeaker (PAL) with compact 24 × 24 cm dimensions that modulates ultrasonic signals rather than wideband audio, enabling focused beam control with reduced hardware and processing demands. This work represents the first demonstration of wideband reproduction using a massive multi-channel focusing PAL, achieved through field-programmable gate array-based ultrasonic delay control combined with single-digital-to-analog converter modulation. Experimental results validate the approach, showing effective focal sound reproduction. This work presents a compact-size approach for high-contrast, wideband sound field control, which offers a potential alternative to conventional EDL arrays.