CN1258706C - High frequency signal transmitting and receiving method for handwriting input device - Google Patents
High frequency signal transmitting and receiving method for handwriting input device Download PDFInfo
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- CN1258706C CN1258706C CN 02159515 CN02159515A CN1258706C CN 1258706 C CN1258706 C CN 1258706C CN 02159515 CN02159515 CN 02159515 CN 02159515 A CN02159515 A CN 02159515A CN 1258706 C CN1258706 C CN 1258706C
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 230000005284 excitation Effects 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
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Abstract
The present invention discloses a high frequency signal transmitting and receiving method used for handwriting input devices, which relates to handwriting input by a computer and belongs to a computer peripheral. The method is mainly used for transmitting and receiving signals. A mutual and alternate change method of a high-frequency signal with the same frequency with resonance frequency of a resonance loop in a handwriting pen and the odd number in tenth (corresponding low frequency) of the frequency of high frequency square waves for transmission and reception to make resonance amplitude in the resonance loop in the handwriting pen preserve large. The present invention enhances the signal strength of the handwriting pen and increases signal-noise ratio. Consequently, the present invention reduces signal judder and improves the fluency performance of the handwriting pen.
Description
Technical field
The present invention relates to a kind of high-frequency signal method for transmitting and receiving that is used for the computing machine hand input device, belong to electricity field.
Background technology
Computing machine handwriting input product category is a lot of now, wherein takes the wired handwriting pad of kind, wireless handwriting pad, wired pressure sensitivity handwriting pad, wireless pressure sensitivity handwriting pad and wireless and passive pressure sensitivity handwriting pad etc. as the leading factor with writing pencil.What application now was the most good is the handwriting pad of the wireless and passive of electromagnetic type, at present the most representative with the technology of the WACOM company of Japan, the principal feature that its signal sends is: the electromagnetic wave of being launched a time slice by the transmitting coil in the handwriting pad earlier, this electromagnetic frequency is identical with the resonance frequency of coil in the writing pencil handwriting, make lc circuit resonance in the handwriting like this, transmitting coil in the handwriting pad stops to send then, switch to accepting state, and the lc circuit in the writing pencil handwriting can be because resonance produces a vibration and decay gradually, receive by the receiving coil in the handwriting pad, and by amplifying and filtering circuit comes out signal extraction, through calculating the XY coordinate position and the pressure sensitive accordingly of trying to achieve planar.This method has certain characteristics, but a weak point is arranged also: be exactly signal between handwriting pad and the pen be alternately to send and receive, the semaphore minimizing that so just in a time period, is produced, quantity of information is enriched inadequately, signal to noise ratio (S/N ratio) is lower, and person's handwriting also has bigger jitter phenomenon.Before this, the present patent application people also proposed a solution, be that application number is: 02117257.9, name is called the patented claim of " wireless, the passive handwriting device that is used for the computing machine typing ", but the method is still waiting to improve part: promptly handwriting pad the signal that can receive strong inadequately, the shake that easily produces person's handwriting.
Summary of the invention
The objective of the invention is to solve above-mentioned signal to noise ratio (S/N ratio) and easily produce the problem of shake than low and person's handwriting, the method that the present invention deals with problems is: the handwriting pad radiating circuit emission high frequency square wave identical with the resonance frequency of resonant tank in the writing pencil transmits, produce corresponding resonance in the resonant tank in writing pencil, and the resonance wave amplitude that resonant tank produces in the maintenance writing pencil reach maximum and stable after, the handwriting pad radiating circuit transmits with the frequency (low frequency relatively) of one of odd number of points of original high frequency square wave frequency again, and switch to accepting state, what at this moment the writing pencil resonant tank vibrated is the harmonic wave of transmission frequency odd-multiple, excitation when the excitation that is subjected to is less than high-frequency emission, the resonance wave amplitude that resonant tank produces in the writing pencil can be decayed gradually, after handwriting pad receiving circuit signal receives, once more with writing pencil in the high frequency square wave of resonance frequency same frequency of resonant tank launch, hocket with this.
Advantage of the present invention with effect is: the mode of the frequency of one of this odd number of points with high frequency and high frequency square wave frequency (relative low rate) replaces method for transmitting, with originally compared with the launching technique of single-frequency merely, strengthened the resonance wave amplitude that resonant tank produces in the writing pencil, because under the certain situation of emission amplitude, when transmission frequency is identical with resonance frequency, the electromagnetism amplitude maximum of resonant tank induction, therefore increase signal to noise ratio (S/N ratio), thereby reduce the shake of handwriting tracks, improved the fluency of handwriting.
Description of drawings
Fig. 1 is the harmonic wave synoptic diagram of handwriting pad high-frequency signal of the present invention emission and reception and writing pencil resonant tank.
Fig. 2 is for adopting the circuit theory synoptic diagram of hand input device of the present invention.
1-writing pencil part, 2-handwriting pad part.
Specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
The writing pencil part mainly is the resonant circuit that is made of electric capacity, inductance among Fig. 2, and its resonance frequency is identical with the transmission frequency of the radiating circuit of handwriting pad part; The handwriting pad part mainly is made of processing main MCU, secondary MCU, radiating circuit, receiving circuit, amplifying circuit, disappear peak circuit, phase angle, amplitude detection circuit and integrating circuit.
The existing main kind of hand input device is a handwriting pad, and the groundwork principle of wireless and passive handwriting pad is now: generally produce signal source by secondary MCU, send by emitter (antenna), resonant circuit by the writing pencil part receives, and produce corresponding electromagnetic resonance signal, can receive by the receiving circuit of handwriting pad part, because receiving circuit is by at X, equally distributed receiving coil is formed in the Y plane, so by different gatings, and amplify, the peak that disappears, phase angle, amplitude and Integral Processing, treated main MCU computing draw the track of pen and the size of pressure when writing.
But in the writing process of reality, because inner, outside various interference and labile factor, make signal in the middle of transmission and processing procedure, produce error, be also referred to as noise, consequently present the phenomenon of shake, in the performance of electromagnetic signal, also show as noise through the person's handwriting that deals, in order to reduce the shake of handwriting tracks, need to increase signal to noise ratio (S/N ratio), the way of often taking is to reduce noise and enhancing signal, and the present invention promptly is an enhancing signal.
When operate as normal, before writing pencil part received signal, secondary MCU produces the high-frequency square-wave signal source earlier in the handwriting pad part, and through the radiating circuit emission, the resonance frequency of the resonant tank of writing pencil part equals or is approximately equal to the transmission frequency of this moment, therefore just produce resonance in the resonant tank in the writing pencil part, at this moment, the time of the high frequency square wave emission in the handwriting pad part will continue a time slice, make the resonance wave amplitude that resonant tank produces in the writing pencil part reach maximum and stable.When handwriting pad partly switches to accepting state, handwriting pad part is again with the frequency emission of one of odd number of points of the relative low frequency of original high frequency square wave frequency, at this moment the resonant tank induction of writing pencil part is the odd-multiple harmonic wave of transmission frequency, the excitation that is subjected to is less than the excitation of previous stage during high-frequency emission, so the resonance wave amplitude that resonant tank produces in the writing pencil part can be decayed gradually, the waveform that transmits and receives as shown in Figure 1, according to Fourier Tranform as can be known, the higher hamonic wave that contains odd multiple number of frequency in the square wave, and the resonance frequency that inductance capacitance constituted in the writing pencil is exactly its odd-multiple, like this, resonance coil in the pen is sensed the higher hamonic wave in the square wave that coil sends on the handwriting pad, will produce resonance; Resonance signal is received circuit directions X coil receive after, amplify through amplifying circuit, again by phase angle, amplitude detection circuit signal decomposition become I mutually with J mutually, at last I is handled main MCU with J by the integrating circuit input mutually, handle main MCU through calculating amplitude and phase angle, wherein amplitude is corresponding to X, Y coordinate position, and phase angle is directly proportional with the pressure of writing pencil.Because when nib is depressed, the inductance value in the pen changes, and causes the phase place of a resonance to be offset, and like this, measures this phase angle, just can draw pen pressure at that time.After handwriting pad part receiving course is finished, promptly switch to emission state once more, the handwriting pad part is launched with high frequency square wave again, the resonance wave amplitude that resonant tank produces in the writing pencil can strengthen gradually, reach stable always, cycle alternation carries out in this way later on, and above-mentioned corresponding signal can be received by receiving circuit in the handwriting pad part.
The present invention has strengthened the resonance wave amplitude that the resonant tank in the writing pencil part produces, and has therefore increased the signal to noise ratio (S/N ratio) of the received signal of handwriting pad part, thereby reduces the shake of handwriting tracks.
Claims (1)
1, a kind of high-frequency signal method for transmitting and receiving of hand input device, it is characterized in that: handwriting pad partly launch with writing pencil part in the identical high-frequency square-wave signal of resonant tank resonance frequency, in resonant tank, produce corresponding resonance, it is maximum and stable that the resonance wave amplitude that resonant tank is produced reaches, when handwriting pad partly switches to accepting state, transmission frequency is the signal of one of the odd number of points of high frequency square wave frequency once more, what at this moment resonant tank vibrated is the harmonic wave of transmission frequency odd-multiple, excitation when the excitation that is subjected to is less than high-frequency emission, the resonance wave amplitude that resonant tank produces can be decayed gradually, after handwriting pad part accepting state finishes, once more launching with the high frequency square wave of the resonance frequency same frequency of resonant tank, with this hocket emission with receive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02159515 CN1258706C (en) | 2002-12-30 | 2002-12-30 | High frequency signal transmitting and receiving method for handwriting input device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02159515 CN1258706C (en) | 2002-12-30 | 2002-12-30 | High frequency signal transmitting and receiving method for handwriting input device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1512302A CN1512302A (en) | 2004-07-14 |
| CN1258706C true CN1258706C (en) | 2006-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02159515 Expired - Lifetime CN1258706C (en) | 2002-12-30 | 2002-12-30 | High frequency signal transmitting and receiving method for handwriting input device |
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| Country | Link |
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| CN (1) | CN1258706C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102193703B (en) * | 2010-03-19 | 2013-03-13 | 太瀚科技股份有限公司 | Multi-signal electromagnetic induction system and multi-signal processing method |
| CN102262494B (en) * | 2010-05-26 | 2013-09-11 | 汉王科技股份有限公司 | Electromagnetic writing device and multi-way scanning method of antenna thereof |
| EP3477439B1 (en) * | 2017-12-27 | 2020-02-12 | Shenzhen Goodix Technology Co., Ltd. | Signal transmission method, active pen, signal reception method and touch screen |
-
2002
- 2002-12-30 CN CN 02159515 patent/CN1258706C/en not_active Expired - Lifetime
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| Publication number | Publication date |
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| CN1512302A (en) | 2004-07-14 |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C56 | Change in the name or address of the patentee |
Owner name: HANWANG BUILDING, HANWANG TECHNOLOGY CO., LTD. Free format text: FORMER NAME OR ADDRESS: BEIJING HANWANG SCIENCE AND TECHNOLOGY CO., LTD. |
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| CP03 | Change of name, title or address |
Address after: 100094 box 5121, Zhongguancun Software Park, Beijing, Haidian District Patentee after: Hanvon Polytron Technologies Inc. Hanvon building Address before: 100080 No. 95 East Zhongguancun Road, Beijing, Haidian District Patentee before: Beijing Hanwang Technology Co.,Ltd. |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161219 Address after: 100193 Beijing, Haidian District, northeast Wang West Road, building 3, floor 363, room 5, room 8 Patentee after: BEIJING HANVON PENTECH TECHNOLOGY CO.,LTD. Address before: 100094 Beijing City, Haidian District Zhongguancun Software Park building 5121 mailbox Hanvon Patentee before: HANWANG TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100193 363, 3 floor, 5 building, 8 Northeast Road, Haidian District, Beijing. Patentee after: HANVON PENTECH Co. TTD Address before: 100193 363, 3 floor, 5 building, 8 Northeast Road, Haidian District, Beijing. Patentee before: BEIJING HANVON PENTECH TECHNOLOGY CO.,LTD. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20060607 |