a terminal device

Abstract

A terminal device, comprising an ultrasonic transmitting module, an ultrasonic receiving module and a processing module, the terminal device is set to: the ultrasonic transmitting module transmits an ultrasonic signal; the ultrasonic receiving module receives the ultrasonic signal through the air; the processing module obtains the terminal The current state of the device, the state includes a far away state and an approaching state; in the far away state, the processing module detects the first characteristic value of the received ultrasonic signal, judges whether it reaches a predetermined threshold, and uses the detection to determine Whether to switch to the approach state; in the approach state, the processing module detects the second characteristic value of the received ultrasonic signal, judges whether it reaches a predetermined threshold, and uses the detection to determine whether to switch to the far away state.

Description

technical field [0001] The invention belongs to the technical field of terminal communication, and relates to a terminal device, in particular, the terminal device uses ultrasonic signals to control the state of the terminal device. Background technique [0002] In terminal equipment based on screen touch technology, proximity sensing is an important anti-mistouch function. Traditional terminal devices, such as mobile phones, implement proximity sensing through infrared proximity sensing. It judges the size of the received reflected infrared energy to judge whether it is approaching or leaving. The disadvantage of this solution is that it is impossible to track and measure moving objects. At the same time, under the background that smart devices continue to increase the screen-to-body ratio, the infrared proximity sensor will occupy additional material costs and the space on the front of the mobile phone, affecting the screen-to-body ratio. promote. [0003] The tradition...

AI Technical Summary

Problems solved by technology

Since the transmitted signal and the echo signal cannot overlap in the time domain, there will be a blind area of ​​the ranging distance, which will affect the accuracy of short-distance ranging

In addition, the transmitted ultrasonic signal contains audio components, which will interfere with the audio range of the sound emitting device, and is not suitable for terminal equipment with voice or call functions.

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