Related Experiment Video
Updated: Jan 14, 2026

Author Spotlight: Development of a Scaffold-Free Acoustic Assembly Method for High-Quality 3D Cell Spheroid Culture
Published on: October 13, 2023
Wideband sound reproduction using a massive multi-channel focusing parametric array loudspeaker system
Tao Zhuang1,2, Mengtong Li1,2, Shaozhe Li1,2
1Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China.
Abstract:
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.
More Related Videos
04:32Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
Published on: December 20, 2024
08:19Controllable Nucleation of Cavitation from Plasmonic Gold Nanoparticles for Enhancing High Intensity Focused Ultrasound Applications
Published on: October 5, 2018
Related Concept Videos
Perceiving Loudness, Pitch, and Location
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
Bandpass Sampling
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
Design Example: Vintage Mixing Console
The specifications for the pre-amplifier were clear. It needed to amplify the audio signal by a factor of 10, have an input impedance above 10...
Design Example
Sound as Pressure Waves
The pressure fluctuation depends on the difference in displacements between the successive points in the...
Passive Filters
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...