Electromagnetic pen, electromagnetic touch receiving device and wireless communication system composed of electromagnetic pen and electromagnetic touch receiving device

Abstract

The invention relates to the field of electromagnetic touch, and discloses an electromagnetic pen, an electromagnetic touch receiving device and a wireless communication system composed of the electromagnetic pen and the electromagnetic touch receiving device. In the electromagnetic pen, the electromagnetic touch receiving device and the wireless communication system, a wireless transmitter is arranged in the electromagnetic pen and used for collecting useful signals of the electromagnetic pen and sending the useful signals to the electromagnetic touch receiving device through electromagnetic waves after the useful signals are combined to form data frames and modulated. A wireless receiver is arranged in the electromagnet touch receiving device and used for receiving electromagnetic signals transmitted by the electromagnetic pen through an antenna array, conducting filtering on the received signals, and conducting analog-digital conversion on the received signals to obtain digital signals. Preprocessing, demodulation and frame decoding are conducted on the digital signals through the digital signal processing technology, and received bit data flow is obtained and outputted. According to the scheme, the useful signals are sent after being combined to form the data frames and modulated, information is transmitted without purely relying on frequencies, and therefore abundant information transmission can be conducted between the electromagnetic pen and the electromagnetic touch receiving device.

Description

Technical field [0001] The present invention relates to electromagnetic touch technology, in particular to an electromagnetic pen, an electromagnetic touch receiving device and a wireless communication system composed of the two. Background technique [0002] Touch technology is used as input control in many products. With the popularity of smart phones and tablet computers, touch technology has become more widely used. These devices usually do not have external keyboard and mouse input devices due to portability and device size limitations. As a natural and convenient input method, touch input has a powerful appeal. There are also many categories of touch input technology, of which stylus input is an important application. Using the stylus, users can directly perform handwriting input on the device, and can also simulate mouse operations. Stylus input devices usually use technologies based on electromagnetic radiation. Such as figure 1 As shown, in devices such as smart pho...

AI Technical Summary

Problems solved by technology

[0004] In the existing active electromagnetic touch solution, the electromagnetic pen usually transmits a single-frequency or continuous frequency sweep signal, and the electromagnetic touch receiving device can only determine the effective information that the electromagnetic pen needs to transmit by detecting the strength and frequency information of the received signal

The frequency change is relatively monotonous, and only approximately linearly changes with the pen pressure, so the amount of information transmitted is very small

In addition, the frequency of the signal emitted by the electromagnetic pen is currently modulated by analog, and its anti-interference and receiving performance are relatively poor

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