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Automatic Calibration Method of Reference Frequency of Electromagnetic Pen

A reference frequency and automatic calibration technology, applied in the field of electromagnetic screen, can solve the problems of large error and low efficiency, and achieve the effect of easy implementation, low error and strong practicability

Active Publication Date: 2021-08-24
VSON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This calibration method is very inefficient, and requires people with a certain technical foundation to realize the operation, and the error is relatively large during mass production, so it has great disadvantages

Method used

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  • Automatic Calibration Method of Reference Frequency of Electromagnetic Pen
  • Automatic Calibration Method of Reference Frequency of Electromagnetic Pen
  • Automatic Calibration Method of Reference Frequency of Electromagnetic Pen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 As shown, the reference frequency automatic calibration method of the electromagnetic pen of the present embodiment includes the following steps:

[0039] S11: electromagnetic screen initialization, read the reference frequency of the stored electromagnetic pen;

[0040] S12: The electromagnetic screen actively scans the signal of the electromagnetic pen;

[0041] S13: The electromagnetic screen acquires several sets of frequency signal values ​​of the signal of the electromagnetic pen from none to some for three times successively and stores them respectively. For example, the first group of frequency signal values ​​is acquired at T time, the second group of frequency signal values ​​is acquired at T+M time, and the third group of frequency signal values ​​is acquired at T+N time. Wherein, M is not equal to N, and each group of frequency signal values ​​includes several frequency signal values ​​of the signal of the electromagnetic pen from scratch;...

Embodiment 2

[0054] Such as figure 2 As shown, the reference frequency automatic calibration method of the electromagnetic pen of the present embodiment includes the following steps:

[0055] S21: electromagnetic screen initialization, read the reference frequency of the electromagnetic pen of storage;

[0056] S22: The electromagnetic screen actively scans the signal of the electromagnetic pen;

[0057] S23: The electromagnetic screen acquires and stores the first group of frequency signal values ​​of the signal of the electromagnetic pen from none to some for the first time. Wherein, the first group of frequency signal values ​​includes several frequency signal values ​​of the signal of the electromagnetic pen from none to some; the several frequency signal values ​​can be set according to needs, for example, 5 to 20 frequency signal values.

[0058] S24: Filtering the first group of frequency signal values ​​to obtain the first reference frequency to be judged;

[0059] S25: Calcula...

Embodiment 3

[0073] Such as image 3 As shown, the reference frequency automatic calibration method of the electromagnetic pen of the present embodiment includes the following steps:

[0074] S31: electromagnetic screen initialization, read the reference frequency of the electromagnetic pen of storage;

[0075] S32: The electromagnetic screen actively scans the signal of the electromagnetic pen;

[0076] S33: The electromagnetic screen acquires the first group of frequency signal values ​​of the signal of the electromagnetic pen from none to some for the first time and stores it. Wherein, the first group of frequency signal values ​​includes several frequency signal values ​​of the signal of the electromagnetic pen from none to some; the several frequency signal values ​​can be set according to needs, for example, 5 to 20 frequency signal values.

[0077] S34: Filtering the first group of frequency signal values ​​to obtain the first reference frequency to be judged;

[0078] S35: Calcu...

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Abstract

A method for automatically calibrating a reference frequency of an electromagnetic pen, comprising the following steps: a method for automatically calibrating a reference frequency of an electromagnetic pen, characterized in that it comprises the steps of: the electromagnetic screen actively scans the signal of the electromagnetic pen; the electromagnetic screen repeatedly acquires Several groups of frequency signal values ​​of the signal of the electromagnetic pen from nothing to time, wherein each group of frequency signal values ​​includes several frequency signal values ​​of the signal of the electromagnetic pen from nothing to time; filter processing is performed on the several groups of frequency signal values ​​respectively , to obtain several reference frequencies to be judged; the several reference frequencies to be judged are compared with the reference frequencies originally stored by the electromagnetic screen; If they are all within the threshold range, calculate the average value of the several reference frequencies to be judged, replace the original reference frequency stored by the electromagnetic screen with the average value, and determine the average value as the calibrated reference frequency.

Description

【Technical field】 [0001] The invention relates to the field of electromagnetic screens, in particular to a method for automatically calibrating a reference frequency of an electromagnetic pen. 【Background technique】 [0002] In the electromagnetic screen system, the principle of pressure sensitivity is realized by the different frequencies generated by the different forces on the electromagnetic pen tip. The greater the force on the electromagnetic pen tip, the greater the frequency change (according to the different internal circuits, the frequency change can be in a large direction or in a small direction). When the pen tip of the electromagnetic pen is not stressed, the pressure sensitivity is 0, and its frequency is a fixed value. Therefore, as long as the frequency when the pressure sensitivity is 0 is determined as the reference frequency, different pressure sensitivity can be realized according to different changing frequencies. Effect. The electromagnetic pen circu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/038G06F3/0354
CPCG06F3/03545G06F3/0383
Inventor 张银虎
Owner VSON TECH
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