A2SP​Lab

Engineers from Inha University and Hyundai Motor Company have developed a software-driven algorithm that dynamically adjusts the touch focal size of mid-air ultrasound haptics without requiring physical hardware changes. Core Innovation Traditional mid-air ultrasound haptics rely on Delay-and-Sum (DAS) beamforming, which adjusts only signal phases and produces a fixed focal area size. The proposed Energy Difference Method (EDM) optimizes both the amplitude and phase of individual transducers. This software-based control allows the device to expand or shrink the acoustic focal area on demand.