Fig. 3: High-speed reconfiguration.
From: Dynamic shaping of multi-touch stimuli by programmable acoustic metamaterial
a Interpolated RMS acceleration field for two unit cells actuated. b Schematic of the experiment with two unit cells driven by sine waves. c Exponential increase in attenuation with the distance between sources. d Maximum gradient of the acceleration field. The inflection point marks the transition from crosstalk between both sources to distinct vibration spots. e Steady-state RMS acceleration with actuation of LRA n = 1, then commuted to LRA n = 6, for a 205 Hz carrier. Here, the unit cells are arranged from right to left, matching standard binary notation with the least significant bit on the rightmost side. f Rising and falling edges recorded during the electronic commutation of LRAs n = 6 and n = 1, respectively. The dotted line represents the exponential envelope of the LRA settling. g Steady-state RMS acceleration for 3-bit binary numbers counted from 0 to 7 in 25 ms intervals. h Decoding sequence with binarization using thresholds optimized for each carrier. i Decoding success rate as a function of the time delay between each word.
