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High frequency signal transmitting and receiving method for handwriting input device

A technology of transmitting and receiving high-frequency signals, which is applied in the field of computer peripheral equipment, can solve problems such as low signal-to-noise ratio and handwriting is prone to jitter, and achieve the effects of increasing signal-to-noise ratio, improving fluency, and reducing jitter

Inactive Publication Date: 2004-07-14
BEIJING HANWANG PENGTAI TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned problems of low signal-to-noise ratio and easy jittering of handwriting, the present invention provides a solution, which can enhance the signal-to-noise ratio of the pen and greatly improve the jittering phenomenon of handwriting

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  • High frequency signal transmitting and receiving method for handwriting input device
  • High frequency signal transmitting and receiving method for handwriting input device
  • High frequency signal transmitting and receiving method for handwriting input device

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0010] figure 1 The middle (1) part is the stylus part in the handwriting device, and (2) is the tablet part of the handwriting device. The stylus part (1) is mainly a resonant circuit composed of capacitors and inductors. Its resonant frequency is the same as the transmitting frequency of the tablet. The tablet part (2) is mainly composed of MCU, transmitting and receiving circuits, amplifier circuits, peak elimination Circuit, phase angle amplitude detection circuit and integration circuit.

[0011] The existing main types of handwriting devices are handwriting boards, and the main working principle of passive wireless handwriting boards is: generally, the signal source is generated by the MCU, sent out through the transmitter (antenna), received by the resonant circuit of the stylus, and The corresponding electromagnetic resonance signal is generat...

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Abstract

The present invention relates to handwriting input for computer and belongs to the field of computer peripheral. The handwriting signal transmitting and receiving method is to transmit and receive alternately in the high frequency the same as the resonant frequency of the resonant circuit in the handwriting pen and in the odd number times lower frequency, and this results in relatively high resonant amplitude, strengthened signal amplitude of handwriting pen, raised S / N ratio, reduced signal jitter and improved trace fluency of handwriting.

Description

technical field [0001] The invention relates to a high-frequency signal transmitting and receiving method of a computer handwriting input device, which belongs to computer peripheral equipment. Background technique [0002] Now there are many types of computer handwriting input products, among which stylus is the leading type, including wired tablet, wireless tablet, wired pressure-sensitive tablet, wireless pressure-sensitive tablet and wireless passive pressure-sensitive tablet. The most promising application at present is the electromagnetic wireless passive tablet. At present, the technology of Japan's WACOM company is the most representative. The main characteristics of its signal transmission are: the transmitting coil in the tablet first transmits a time segment The frequency of this electromagnetic wave is the same as the resonant frequency of the coil in the stylus body, which makes the LC circuit in the stylus resonate, and then the transmitting coil in the tablet ...

Claims

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Application Information

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IPC IPC(8): G06F3/02H04B1/04H04B1/16
Inventor 刘迎建王红岗赵亮
Owner BEIJING HANWANG PENGTAI TECH CO LTD