Electromagnetic signal control method, electromagnetic induction detecting device and electromagnetic handwriting system

Abstract

An embodiment of the invention provides an electromagnetic signal control method, an electromagnetic induction detecting device and an electromagnetic handwriting system and relates to the technical field of electrics. For improving the detecting speed during positioning of an electromagnetic pen and the writing effect of the electromagnetic pen, the technical scheme is that rectangular waves or approximate rectangular waves of first frequency are transmitted to produce electromagnetic waves same as the first frequency and electromagnetic waves of odd number frequency of the first frequency; inductive electromagnetic waves transmitted by the electromagnetic pen are detected and include the electromagnetic waves of the first frequency and at least one electromagnetic wave in the electromagnetic waves of the odd number frequency of the first frequency; and operation information of the electromagnetic pen is obtained according to detected inductive electromagnetic waves. The electromagnetic signal control method, the electromagnetic induction detecting device and the electromagnetic handwriting system are applicable to a wireless passive electromagnetic sensing technology.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to an electromagnetic signal control method, an electromagnetic induction detection device and an electromagnetic handwriting system. Background technique [0002] Electromagnetic sensing technology has the characteristics of high resolution and not easily affected by the outside world, and is currently being used more and more widely. The wireless passive electromagnetic sensing technology in the electromagnetic sensing technology, because the electromagnetic pen does not need to receive the excitation from the electromagnetic board through the wire, and there is no battery in the electromagnetic pen, it is easy to miniaturize, so the representative of wireless passive electromagnetic sensing technology With the highest level of contemporary electromagnetic sensing technology, it has been widely used in various fields such as drawing boards, drawing screens, and embedded produc...

AI Technical Summary

Problems solved by technology

And in order to prevent the interference between these electromagnetic waves of different frequencies, the resonant frequencies of these electromagnetic pens are quite different from each other

Therefore, in actual use, it is necessary to switch the emission of electromagnetic waves of different frequencies, which will cause a delay in finding the pen (position detection or function detection of the electromagnetic pen, etc.)

In addition, frequent switching of the emission of electromagnetic waves of different frequencies will seriously reduce the transmission speed of the effective data packets sent by the electromagnetic board to the host computer, which in turn will affect the writing effect of the electromagnetic pen, resulting in a series of problems such as broken lines and broken lines.

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