US 11,995,246 B2
Method for touchless gesture recognition, and apparatuses using the same
Yu-Xuan Xu, Hsinchu (TW); Ching-Lung Chan, Hsinchu (TW); Shih-Chung Wang, Hsinchu (TW); Yen-Son Paul Huang, Santa Clara, CA (US); and Shih-Chin Gong, Taipei (TW)
Assigned to FORTEMEDIA, INC., Alviso, CA (US)
Filed by Fortemedia, Inc., Santa Clara, CA (US)
Filed on Feb. 13, 2023, as Appl. No. 18/167,949.
Claims priority of provisional application 63/379,455, filed on Oct. 14, 2022.
Prior Publication US 2024/0126374 A1, Apr. 18, 2024
Int. Cl. G06F 3/16 (2006.01); G06F 3/01 (2006.01)
CPC G06F 3/017 (2013.01) [G06F 3/167 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for touchless gesture recognition, used in a portable electronic device, comprising:
transmitting ultrasonic signals between 20 KHz to 40 KHz via a speaker;
receiving reflected ultrasonic signals from a hand via two or more microphones;
computing, by a processor unit, a frequency shift according to the reflected ultrasonic signals;
identifying, by the processor unit, a gesture that corresponds to a movement of the hand according to the frequency shift, wherein the frequency shift is computed the processor unit by applying Fourier Transform (FT); and
performing, by the processor unit, a function that corresponds to the gesture;
wherein the gesture is a two-dimensional gesture when there are more than two microphones.