CN102184069A - Electromagnetic handwriting device and noise elimination method thereof - Google Patents
Electromagnetic handwriting device and noise elimination method thereof Download PDFInfo
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- CN102184069A CN102184069A CN2011101461887A CN201110146188A CN102184069A CN 102184069 A CN102184069 A CN 102184069A CN 2011101461887 A CN2011101461887 A CN 2011101461887A CN 201110146188 A CN201110146188 A CN 201110146188A CN 102184069 A CN102184069 A CN 102184069A
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Abstract
The invention discloses an electromagnetic handwriting device and a noise elimination method thereof and belongs to the technical field of electromagnetic handwriting. The electromagnetic handwriting device comprises an electromagnetic pen, an antenna plate, a control part, a receiving unit and a transmitting unit, wherein the antenna plate is provided with a plurality of groups of transmitting coils and receiving coils; the receiving unit receives signals from the receiving coils and transmits the processed signals to the control part; and the transmitting unit processes a control signal output by the control part and transmits the control signal to the transmitting coils; and the control part comprises a noise detecting and identifying unit and a signal shielding unit, wherein the noise detecting and identifying unit detects a gain value of a signal output by the receiving unit and the sequence number of the receiving coils and transmitting coils corresponding to the amplitude of the signal, compares the detected result with a preset parameter value, identifies the signal as a noise signal when the detected result is equal to the parameter value, and shields the noise signal through the signal shielding unit. Therefore, the interference of the noise signal which is generated by electrical equipment inside the device on handwriting operation is effectively eliminated.
Description
Technical field
The present invention relates to electromagnetism handwriting input field, relate to a kind of electromagnetism handwriting device and noise cancellation method thereof particularly.
Background technology
Existing electromagnetism handwriting device generally comprises magnetic board and time writer, the electromagnetism handwriting device generally sends electromagnetic wave by sending coil to time writer, make time writer produce electromagnetic induction signal, thereby receive and handle this electromagnetic induction signal afterwards and obtain data messages such as the position of time writer and pressure, by these information are handled and exported, thereby finish hand-written operation.
In the prior art, because electromagnetism handwriting device inside can be equipped with other electron devices, as loudspeaker, backlight etc., after the energising of electromagnetism handwriting device, no matter whether time writer is near magnetic board, all can produce the electromagnetic signal of fixed frequency after the above-mentioned electrical equipment energising, this electromagnetic signal can cause certain interference to the electromagnetic induction signal that time writer produces, especially under the situation of the receiving coil close together of above-mentioned electron device and magnetic board, this electromagnetic signal is more obvious, this electromagnetic signal that the device internal electronic device produces is a kind of noise signal, this noise signal causes the accuracy rate of electromagnetism handwriting device input to descend, cause the maloperation and the false triggering of electromagnetism handwriting device easily, thereby bring puzzlement to the user.
Summary of the invention
For addressing the above problem, the invention provides a kind of electromagnetism handwriting device and noise cancellation method thereof, the noise signal so that the internal electronic device of effective elimination electromagnetism handwriting device produces improves the accuracy rate of signal input.
Electromagnetism handwriting device of the present invention comprises: time writer, has the antenna plate that many groups send coil and many group of received coil, control part, receive the signal of above-mentioned receiving coil, and the signal that sends to the receiving element of above-mentioned control part after this signal handled and handle above-mentioned control part output, and this signal is sent to the transmitting element of above-mentioned transmission coil, wherein, control part comprises walkaway recognition unit and signal shielding unit, above-mentioned walkaway recognition unit detects the signal of receiving element output, obtain the receiving coil corresponding with the amplitude of this signal, send the sequence number of coil, and the yield value of signal, and the result that will detect and preset parameters value compare, and when testing result equates with described parameter value this signal is identified as noise signal; Above-mentioned signal shielding unit after described signal is identified as noise signal, shields this noise signal.
The noise cancellation method of electromagnetism handwriting device of the present invention, this electromagnetism handwriting device comprises time writer, has the antenna plate that many groups send coil and many group of received coil, control part with walkaway recognition unit and signal shielding unit, receiving element from this receiving coil received signal and processing, receive the signal of above-mentioned control part and to sending to the transmitting element of above-mentioned transmission coil after this signal Processing, this noise cancellation method comprises: signal detection step: the signal to above-mentioned receiving element output detects, and obtains the receiving coil corresponding with the amplitude of this signal, send the sequence number of coil, and the yield value of this signal; Signal identification step: the testing result and the preset parameters value of this signal are compared, when testing result equates with described parameter value, this signal is identified as noise signal; Signal shielding step: after described signal is identified as noise signal, this noise signal is shielded.
Electromagnetism handwriting device provided by the invention and noise cancellation method thereof, detect by parameter value the signal that receives, after identifying noise signal, this noise signal is shielded, the noise signal of the natural frequency that produces thereby the cancellation element internal electronic device powers on has been avoided problems such as the false triggering of electromagnetism handwriting device and maloperation effectively.
Description of drawings
Figure 1 shows that the structural representation of electromagnetism handwriting device of the present invention.
Figure 2 shows that the structural representation of the transmitting element of electromagnetism handwriting device of the present invention.
Figure 3 shows that the structural representation of the receiving element of electromagnetism handwriting device of the present invention.
Figure 4 shows that the structural representation of control part of the electromagnetism handwriting device of a preferred embodiment of the present invention.
Figure 5 shows that the workflow diagram of the electromagnetism handwriting device noise cancellation method of a preferred embodiment of the present invention.
Embodiment
Below, be described with reference to the accompanying drawings the specific embodiment of the present invention.
Fig. 1 is the structural representation of the electromagnetism handwriting device 10 of a preferred embodiment of the present invention, as shown in Figure 1, electromagnetism handwriting device 10 of the present invention comprises: have transmission coil 11 and magnetic board 1, receiving element 2, control part 3, transmitting element 4 and the inner time writer 5 that contains electromagnetic wave resonant circuit 51 of organizing the receiving coil 12 that is arranged in parallel that many groups are arranged in parallel more.
When time writer 5 and magnetic board 1 near to or in contact with the time, the digital signal of 4 pairs of control parts of transmitting element, 3 outputs is handled the back and is produced pumping signal, and this pumping signal is sent to time writer 5 with form of electromagnetic wave by the transmission coil 11 in the magnetic board 1, the electromagnetic wave resonant circuit 51 of time writer 5 by inside generates electromagnetic induction signal after producing resonance with this pumping signal, and this electromagnetic induction signal sent back to magnetic board 1, the electromagnetic induction signal that receiving element 2 receives the receiving coil in the magnetic board 1 12 handle and be converted to digital signal after send to control part 3, carry out computing by 3 pairs of data of control part, thereby determine position coordinates and the information such as force value of time writer 5 on magnetic board 1, to send to the host computer (not shown) through the data of computing afterwards, these data will be shown to the user with forms such as images by host computer.In the present embodiment, host computer is the display screen that is integrated on the magnetic board 1, but the present invention is not limited to this, and the host computer among the present invention also can be terminal devices such as computer.
Fig. 2 is the structural representation of transmitting element 4 in the electromagnetism handwriting device 10 of a preferred embodiment of the present invention, as shown in Figure 2, transmitting element 4 comprises multidiameter option switch 21, transmission amplifying circuit 42 and the exiting signal generating circuit 43 of an end that is connected many group transmission coils 11.
As shown in Figure 1, the digital signal of control part 3 outputs is at first handled by exiting signal generating circuit 43, and the pumping signal of generation assigned frequency, sending 42 pairs of these pumping signals of amplifying circuit afterwards amplifies, one group that utilizes multidiameter option switch to organize 21 pairs in the transmission coil 11 is carried out gating more, thereby sends these pumping signals by sending coil 11 to time writer 5.
Fig. 3 is the structural representation of receiving element 2 of the electromagnetism handwriting device 10 of a preferred embodiment of the present invention, as shown in Figure 3, receiving element 2 comprises that the multidiameter option switch 21, reception amplifying circuit 22, signal processing circuit 23 and the integrating circuit 24 that link to each other with many group of received coil 12 are the A/D change-over circuit with analog to digital conversion circuit 25().
As shown in Figure 1, many group of received coil 12 in the magnetic board 1 is behind the electromagnetic induction signal that receives time writer 5, scan by the group of received coil 12 more than 21 pairs of the multidiameter option switch in the receiving element 2, i.e. gating one group of received coil 12 one by one, thereby obtain the electromagnetic induction signal that every group of received coil 12 receives, and utilize 22 pairs of these signals of reception amplifying circuit to amplify, after signal after 23 pairs of these amplifications of signal processing circuit is handled, undertaken by integrating circuit 24 and 25 pairs of signals of analog to digital conversion circuit again that the form with data sends to control part 3 to determine the information such as position coordinates of time writer 5 on magnetic board 1 after integration and the analog to digital conversion.
Yet, because in the practical application, tend to be equipped with various electric elements in electromagnetism handwriting device inside, as loudspeaker, backlight etc., the electromagnetic signal that can produce certain frequency after the above-mentioned electric elements energising is a noise signal, many group of received coil 12 also can receive the noise signal that above-mentioned electric elements produce in the electromagnetic induction signal that receives the time writer generation, and this noise signal is received unit 2 with the electromagnetic induction signal by time writer 5 outputs that receives and carries out outputing to control part 3 after the above-mentioned processing, thereby the operate as normal signal to time writer 5 outputs has caused interference, influenced the bearing accuracy of time writer 5, and cause false triggering, problems such as maloperation are made troubles to the user.
Find that after deliberation because the noise signal that the inner electric elements of device produce produces because of the electric elements back that powers on, therefore, the frequency of this noise signal is changeless.In order effectively to eliminate the intrinsic noise signal that electromagnetism handwriting device internal electronic device produces, improve the accuracy rate of signal input, the invention provides a kind of electromagnetism handwriting device of eliminating noise.
Figure 4 shows that shown in the structural representation of control part 3 of electromagnetism handwriting device 10 of a preferred embodiment of the present invention, include the walkaway recognition unit 31 and the signal shielding unit 32 that are used to eliminate noise signal in the control part 3.Describe electromagnetism handwriting device 10 and noise cancellation method thereof in detail below with reference to Fig. 4 and Fig. 5.
In the present embodiment, when electromagnetism handwriting device 10 is in holding state, promptly when time writer 5 is kept off or do not contact magnetic board 1, after the signal that many group of received coil 12 receives is noise signal (the non-electromagnetic induction signal that comes from time writer 5), this noise signal is promptly handled by receiving element 4, and be output to control part 3, determine the correlation parameter of this noise signal by control part 3, the transmission coil 11 and the receiving coil 12 that comprise the amplitude correspondence of this noise signal, and the yield value of this noise signal, and preserve the above-mentioned parameter value as the preset parameters value.
Behind the treated signal of receiving element 4 outputs, after promptly having carried out signal receiving step 501 shown in Figure 5, walkaway recognition unit 31 all can receive and detect this signal, promptly carry out the signal detection step 502 among Fig. 5, and with the yield value of detected this signal, parameters such as transmission coil 11 corresponding with the amplitude of this noise signal and receiving coil 12 and above-mentioned preset parameters value compare, promptly carry out the signal identification step 503 among Fig. 5, then this signal is identified as noise signal if equate, and send to signal shielding unit 32, by signal shielding unit 32 with signal shielding, be the signal shielding step 504 in the execution graph 5, to eliminate this noise signal; Then this signal is identified as normal working signal as if unequal, carry out follow-up computing by 3 pairs of signals of control part, be that actual figure it is calculated that treatment step 505, determining the information such as coordinate of time writer 5 on magnetic board 1, and these information are shown to the user by the host computer (not shown).
In the present embodiment, default parameter value is the noise signal by receiving under the detection holding state, the yield value of resulting this noise signal and the transmission coil 11 corresponding with the amplitude of this noise signal, the parameters such as sequence number of receiving coil 12.
In electromagnetism handwriting device of the present invention and noise cancellation method thereof, utilize the walkaway recognition unit that the signal that receives is detected, and the correlation parameter of this signal and pre-set parameter value compared, thereby the noise signal of identifying, utilize the noise shielding unit with this noise signal shielding afterwards, and then eliminate of the influence of this noise signal the electromagnetism handwriting device.By electromagnetism handwriting device of the present invention and noise cancellation method thereof, can be simple and effective the power on noise signal of the fixed frequency that the back produces of the inner electric elements of elimination electromagnetism handwriting device, avoided false triggering that interference causes, maloperation etc., made the user can carry out accurately smooth writing because of noise signal.
The above is the preferred embodiments of the present invention only, yet the present invention is not limited to the foregoing description.Those of ordinary skill in the art is reading on the basis of instructions of the present invention and can make amendment to the technical scheme that each embodiment put down in writing, and perhaps part technical characterictic is wherein replaced; And these modifications or replacement are contained in the scope of technical solution of the present invention.
Claims (8)
1. an electromagnetism handwriting device is characterized in that, comprising: magnetic board; Described magnetic board comprises:
Antenna plate, it has many groups and sends coil and many group of received coil;
Control part;
Wherein, described control part comprises walkaway recognition unit and signal shielding unit, described walkaway recognition unit detects the signal that receiving coil received, obtain the sequence number of described receiving coil corresponding and described transmission coil and the yield value of received signal with the amplitude of received signal, and the result that will detect and preset parameters value compare, and when testing result equates with described parameter value described signal is identified as noise signal; Described signal shielding unit is connected with the walkaway recognition unit, and the detected noise signal of walkaway recognition unit is shielded.
2. electromagnetism handwriting device according to claim 1, it is characterized in that, described preset parameters value be with the matching used time writer of magnetic board when the magnetic board, described control part detects the resulting receiving coil corresponding with the amplitude of described received signal and the sequence number of transmission coil and the yield value of received signal to the signal that receives.
3. electromagnetism handwriting device according to claim 1 is characterized in that this device also comprises transmitting element, and it handles the control signal by described control part output, and sends to described transmission coil; Described transmitting element comprises:
Exiting signal generating circuit, its control signal to described control part output is handled, and produces pumping signal;
Send amplifying circuit, its pumping signal to described exiting signal generating circuit output is amplified;
Multidiameter option switch, it links to each other with many groups of described transmission coils, by described transmission coil is carried out gating, the signal of described amplifying circuit output is exported to described transmission coil.
4. according to claim 1 or 3 described electromagnetism handwriting devices, it is characterized in that this device also comprises receiving element, the signal that it receives from described receiving coil sends to described control part after the processing; Described receiving element comprises:
Multidiameter option switch, it links to each other with many groups of described receiving coils, by one by one many groups of described receiving coils being carried out gating, scans described receiving coil;
Receive amplifying circuit, it amplifies the signal from described receiving coil;
Signal processing circuit, its signal to described amplifying circuit output is handled;
Integrating circuit, its signal with described signal processing circuit output carries out Integral Processing; With
Analog to digital conversion circuit, it will send to described control part after will carrying out mould/number conversion through the signal after the Integral Processing.
5. the noise cancellation method of an electromagnetism handwriting device, it is characterized in that, described electromagnetism handwriting device comprises time writer, has the antenna plate that sends coils and many group of received coil, the control parts with walkaway recognition unit and signal shielding unit organized more, the noise cancellation method of this electromagnetism handwriting device comprises:
Signal detection step: the signal that receiving coil received is detected, obtain described receiving coil and the sequence number of described transmission coil and the yield value of received signal of the amplitude correspondence of received signal;
Signal identification step: the testing result and the preset parameters value of described signal are compared, when testing result equates with described parameter value, described signal is identified as noise signal;
Signal shielding step: after described signal is identified as noise signal, described noise signal is shielded.
6. electromagnetism handwriting device noise cancellation method according to claim 5, it is characterized in that: described preset parameters value at time writer when the magnetic board, described control part detects the resulting receiving coil corresponding with the amplitude of described received signal and the sequence number of transmission coil and the yield value of received signal to the signal that receives.
7. electromagnetism handwriting device noise cancellation method according to claim 5, it is characterized in that: described the signal that receiving coil received is detected before, this method also comprises: the received signal of receiving coil is carried out sending to described control part after processing and amplifying, orthogonal processing, Integral Processing and the analog-to-digital conversion process.
8. electromagnetism handwriting device noise cancellation method according to claim 7, it is characterized in that: this method also comprises: the signal to described control part output is handled, generate pumping signal, and this pumping signal is carried out sending to described transmission coil by described multidiameter option switch after the processing and amplifying.
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| CN2011101461887A CN102184069A (en) | 2011-06-01 | 2011-06-01 | Electromagnetic handwriting device and noise elimination method thereof |
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| CN2011101461887A CN102184069A (en) | 2011-06-01 | 2011-06-01 | Electromagnetic handwriting device and noise elimination method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103064577A (en) * | 2011-10-19 | 2013-04-24 | 汉王科技股份有限公司 | Input method and device of electromagnetic touch |
| CN110321020A (en) * | 2018-03-30 | 2019-10-11 | 北京钛方科技有限责任公司 | A kind of piezo-electric sensor signals noise remove method and device |
| CN110413189A (en) * | 2018-04-28 | 2019-11-05 | 北京钛方科技有限责任公司 | A kind of dummy keyboard control method and system |
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| CN101957705A (en) * | 2010-09-30 | 2011-01-26 | 汉王科技股份有限公司 | Electromagnetic handwriting equipment and noise recognizing method thereof |
| US7887911B2 (en) * | 2003-03-25 | 2011-02-15 | Shin-Etsu Polymer Co., Ltd. | Electromagnetic noise suppressor, article with electromagnetic noise suppressing function and their manufacturing methods |
| CN102063238A (en) * | 2010-12-24 | 2011-05-18 | 汉王科技股份有限公司 | Processing method and device of electromagnetic induction signal |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7887911B2 (en) * | 2003-03-25 | 2011-02-15 | Shin-Etsu Polymer Co., Ltd. | Electromagnetic noise suppressor, article with electromagnetic noise suppressing function and their manufacturing methods |
| CN101957705A (en) * | 2010-09-30 | 2011-01-26 | 汉王科技股份有限公司 | Electromagnetic handwriting equipment and noise recognizing method thereof |
| CN102063238A (en) * | 2010-12-24 | 2011-05-18 | 汉王科技股份有限公司 | Processing method and device of electromagnetic induction signal |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103064577A (en) * | 2011-10-19 | 2013-04-24 | 汉王科技股份有限公司 | Input method and device of electromagnetic touch |
| CN103064577B (en) * | 2011-10-19 | 2015-08-26 | 汉王科技股份有限公司 | The input method of electromagnetic touch and device |
| CN110321020A (en) * | 2018-03-30 | 2019-10-11 | 北京钛方科技有限责任公司 | A kind of piezo-electric sensor signals noise remove method and device |
| CN110413189A (en) * | 2018-04-28 | 2019-11-05 | 北京钛方科技有限责任公司 | A kind of dummy keyboard control method and system |
| CN110413189B (en) * | 2018-04-28 | 2021-12-10 | 北京钛方科技有限责任公司 | Virtual keyboard control method and system |
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Application publication date: 20110914 |