Gesture recognition system and method based on ultrasonic waves

Abstract

The invention discloses a gesture recognition system based on ultrasonic waves.The gesture recognition system comprises an electronic device capable of transmitting acoustic waves and recording acoustic wave signals at the same time, and the electronic device comprises an acoustic wave transmitter, an acoustic wave receiver and a measurement and recognition module.The electronic device controls the acoustic wave transmitter to transmit the acoustic waves, and the transmitted acoustic waves irradiate a target to generate reflected waves; the acoustic wave receiver receives the acoustic wave signals to send the acoustic wave signals to the measurement and recognition module, the acoustic waves are measured, and the gesture parameters are obtained to recognize gestures; the electronic device controls the acoustic wave receiver to receive the acoustic waves, the acoustic wave signals reflected by the target are obtained, the acoustic wave signals received by the acoustic wave receiver are mixed signals, the mixed signals comprise direct signals from acoustic sources, signals reflected by nearby objects and signals reflected by the target at the same time.The invention further discloses a gesture recognition method based on the ultrasonic waves.

Description

technical field [0001] The invention relates to the fields of signal processing and human-computer interaction, in particular to an ultrasonic-based gesture recognition system. Background technique [0002] With the popularity of smart phones and various smart wearable devices (such as smart watches, smart bracelets, etc.), people have put forward higher demands on the input functions of smart devices. Existing smart devices mainly rely on touch screen input, and its disadvantages are: 1. The touch screen is only suitable for larger devices. On small devices such as smart watches, the area of ​​the touch screen is very small and cannot meet complex input requirements; 2. 1. When inputting on the touch screen, fingers will block part of the display and easily trigger misoperations; 3. The cost of touch screen is relatively high. [0003] In order to solve these problems of the touch screen, in recent years, researchers have proposed to use non-contact gesture recognition to ...

AI Technical Summary

Problems solved by technology

Existing smart devices mainly rely on touch screen input, and its disadvantages are: 1. The touch screen is only suitable for larger devices. On small devices such as smart watches, the area of ​​the touch screen is very small and cannot meet complex input requirements; 2. 1. Fingers will block part of the display when inputting on the touch screen, and it is easy to trigger misoperation; 3. The cost of touch screen is relatively high

The defect of the existing ultrasonic gesture recognition is that the Doppler frequency measurement needs to be analyzed in the time-frequency domain, and the granularity is relatively coarse, which can only achieve rough measurement of the moving direction and moving speed

However, mmWave-based systems need to add dedicated gesture recognition chips and antennas to smart devices, bringing additional costs

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