Ultrasound-based methods for touchless gesture recognition, and apparatuses using the same

摘要

A portable electronic device including an ultrasound transmitter, an ultrasound receiver, and a processing unit is provided. The ultrasound transmitter sends ultrasonic signals, while the ultrasound receiver receives reflected ultrasonic signals from an object. The ultrasound transmitter and the ultrasound receiver are disposed to form a reference axis. The processing unit processes the reflected ultrasonic signals to obtain a time-frequency distribution thereof, and determines a 1D gesture corresponding to projection loci of movements of the object on the reference axis according to the time-frequency distribution.

主权项

1. A portable electronic device, comprising:
a first ultrasound transmitter, sending ultrasonic signals; a first ultrasound receiver, receiving reflected ultrasonic signals from an object, wherein the first ultrasound transmitter and the first ultrasound receiver are disposed to form a reference axis, and the first ultrasound receiver is a directional microphone which provides another reference axis non-parallel to the reference axis, and the two reference axes further form a reference plane; and a processing circuit, processing the reflected ultrasonic signals to obtain a time-frequency distribution thereof, determining a 1D gesture corresponding to projection loci of movements of the object on the reference axis according to the time-frequency distribution, and determining a 2D gesture corresponding to projection loci of movements of the object on the reference plane according to the time-frequency distribution.