CN1196054C - Coordinate input method and device - Google Patents
Coordinate input method and device Download PDFInfo
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- CN1196054C CN1196054C CN 01122363 CN01122363A CN1196054C CN 1196054 C CN1196054 C CN 1196054C CN 01122363 CN01122363 CN 01122363 CN 01122363 A CN01122363 A CN 01122363A CN 1196054 C CN1196054 C CN 1196054C
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- signal
- digiboard
- coordinate
- digital
- cursor device
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Abstract
The present invention relates to a coordinate input method and a device thereof. The coordinate input method comprises the following steps: a cursor receives a signal of an electromagnetic field on a particular position on a digital plate and converts the signal to a digital signal, and the cursor transmits the digital signal back to the digital plate; a receiving signal is confirmed as a peak signal by a signal confirming means; after the digital plate receives the digital signal, the coordinate position of the cursor on the digital plate is determined by another confirming means. The coordinate input method establishes the connection of the digital signal between the cursor and the digital plate so as to ensure that the receiving and the sending of the signal of a coordinate device are free from interference. In the coordinate input method, a plurality of mistake preventing measures are provided, and accuracy and stability can be enhanced.
Description
Technical field
Relevant a kind of coordinate input method of the present invention and device.
Background technology
Digiboard is one of main coordinate entering device of computing machine, and it is to cooperate a cursor device, moves its position and carry out to click action on digiboard, to handle the cursor on the screen or to carry out function.Its principle of work is with the array form several receiving coils and transmitting coil to be installed at the medial surface of digiboard, and the cursor device is the simulating signal that receives its transmitting coil emission on digiboard, and produce a simulating signal according to this and return to the receiving coil on the digiboard, after receiving coil in the digiboard receives, promptly through processing and amplifying, again by the position of the interior processor interpretation cursor device of establishing, and then the cursor position or the action of decision screen.Be the input media of using this principle as No. 4786765 patent of invention of the U.S..Other European patent discloses the 0607694AI patent and also uses similar principles in coordinate entering device.
Only the signal transmission form by electromagnetic field inducing has its significant disadvantage to exist between described digiboard and cursor device:
One. be subject to disturb: be that the inductive electromagnetic field signal is to constitute the transmitted in both directions of signal in air between digiboard and cursor device, during this period, its induced signal is subject to the noise of external environment, causes the instability and the misoperation of system.
Two. power consumption: since the cursor device be by behind the digiboard induced signal again the passback, so signal intensity a little less than, can receive stronger and stable signal for guaranteeing digiboard, digiboard must use stronger electric power to transmit, therefore, its power consumption is higher.
From the above, the signal transfer mode between existing digiboard and cursor device exist degree of accuracy low, be subject to disturb and problems such as power consumption, need to be further reviewed, and seek feasible solution.
Summary of the invention
Therefore, fundamental purpose of the present invention is to provide a kind of and can constitutes digital data transmission between cursor device and digiboard in case system is disturbed and reached the coordinate input method of power saving purpose and the device that is adopted thereof.
For realizing above-mentioned purpose of the present invention, a kind of coordinate input method according to an aspect of the present invention is characterized in, may further comprise the steps: the electromagnetic field signal that is received its emission by the cursor device on digiboard; The cursor device is converted to digital signal with the electromagnetic field signal that receives; The cursor device returns described digital signal; Receive the digital signal of cursor device passback by digiboard, and judge further whether it is peak signal,, promptly receive the electromagnetic field signal of next group dispatch coil emission of digiboard again, till receiving peak signal as non-peak signal; As be peak signal, promptly stop to launch electromagnetic field signal, and then receive the status signal that the cursor device is sent here subsequently; The digital signal of utilizing digiboard to receive is judged the coordinate position of cursor device on digiboard, and coordinate signal and status signal are passed to computing machine.
For achieving the above object, coordinate entering device according to a further aspect of the invention, it is made up of a cursor device and a digiboard; Be characterized in that described cursor device includes: a dual-mode antenna group, in order to the simulating signal of reception digiboard emission, or the passback digital signal is given digiboard; One pulse producer, it is connected in the output terminal of transmitting/receiving wireless group, produces an activation signal in order to the signal according to the dual-mode antenna group of received; One analog/digital converter, its input end are to be connected with the dual-mode antenna group by an amplifier, are digital signal in order to the analog signal conversion with its reception; One process control unit, its input end are to be connected with the output terminal of pulse producer, and its output terminal is to be connected to analog/digital converter; One storage and comparing unit, its input end is connected with output terminal and one group of button of analog/digital converter respectively; Its output terminal is to be connected to the dual-mode antenna group by a parallel/serial conversion unit; Be provided with many group dispatch coils in the described digiboard, it is connected with a signal transmitting and receiving unit by an analog switch, described signal transmitting and receiving unit includes: a high frequency geophone, be to be connected with the I/O end of described analog switch, enter detection in order to the digital signal that dispatch coil is received and handle by an electric capacity; One differential amplifier is an output terminal of being located at high frequency geophone, to make processing and amplifying; One hysteresis comparator is that the output signal of differential amplifier is done to confirm to handle; One microprocessor, its input end are to be connected with the I/O end of analog switch by described circuit: the one control output end is connected to the control end of analog switch, switches with the transmitting-receiving of control analog switch; One drive circuit, its input end are to be connected with a sequential generator by a wave filter, and wherein timing sequencer is controlled by microprocessor; Described driving circuit output terminal is the I/O end that is connected to analog switch by another electric capacity.
The LC resonant circuit that described dual-mode antenna group is made up of inductance and electric capacity.
Described digiboard is to adopt the LC resonance mode to transmit, and the emission and the received signal of digiboard are to take place simultaneously simultaneously, mainly is to adopt load modulation (Load Modulation) mode to carry out.And digiboard only need be launched a little electric current, return again to digiboard by being converted to digital signal after the reception of cursor device, can judge the position of cursor device on digiboard, and then the coordinate on the decision computer screen, signal radiation pattern power saving that like this can more existing digiboard, and can guarantee the accuracy of signal.
Be clearer understanding purpose of the present invention, characteristics and advantage, the present invention is described in detail below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is a system schematic of the present invention;
Fig. 2 is the wiring diagram of digiboard internal circuit of the present invention;
Fig. 3 is the wiring diagram of cursor device internal circuit of the present invention;
Fig. 4 is the workflow diagram of cursor device of the present invention;
Fig. 5 is the workflow diagram of digiboard of the present invention.
Embodiment
At first see also shown in Figure 1, its announcement has a digiboard 10 and a cursor device 20, wherein digiboard 10 inside are provided with several dispatch coil (not shown) with the array form, but the electromagnetic field signal of dispatch coil launching simulation wherein, and receive by cursor device 20, be arranged with pressure transducer 201 and button 202/203 on the cursor device 20, wherein pressure transducer 201 is to be located at cursor device 20 front end inboards; When cursor device 20 is sensed electromagnetic field signal on digiboard 10, promptly become digital signal in internal conversion, digiboard 10 is given in passback again, judges the coordinate position of cursor device 20 according to the digital signal of described passback for digiboard 10.
To further describe the inside detailed construction of digiboard 10 and cursor device 20 below:
At first see also shown in Figure 3ly, it is the internal circuit diagram of cursor device 20, and it includes:
One dual-mode antenna group 21, by the resonant circuit that inductance L I and capacitor C I form, in order to the simulating signal of reception digiboard 10 emissions, or the passback digital signal is given digiboard 10; Wherein, to can be coil turn be less person to inductance L I;
One pulse producer 22 is made up of a RC circuit and a comparer, and it is connected in the output terminal of dual-mode antenna group 21, produces an activation signal in order to the signal that receives according to dual-mode antenna group 21;
One analog/digital converter 23, its input end are to be connected with dual-mode antenna group 21 by an amplifier 24, are digital signal in order to the analog signal conversion with its reception; Its another input end is to be connected with described pressure detector 201, so that the pressure signal of analog form is converted to digital signal;
One process control unit 25, its input end are to be connected with the output terminal of pulse producer 22, " waken up " by its output signal, and its output terminal is to be connected to analog/digital converter 23, to control its work;
One storage and comparing unit 26, its input end is connected with the output terminal and the described button 202,203 of analog/digital converter 23 respectively; Its output terminal is to be connected to dual-mode antenna group 21 by a parallel/serial conversion unit 27;
One frequency eliminator 28 is to be connected between dual-mode antenna group 21 and the parallel/serial conversion unit 27.
Detailed as described below as for the working method of described circuit, please cooperate the workflow diagram of consulting Fig. 4:
When dual-mode antenna group 21 is responded to a simulating signal from digiboard 10, produce a pulse to wake (WAKE UP) process control unit 25 up by pulse producer 22 immediately, and the signal that dual-mode antenna group 21 receives is also delivered to parallel/serial conversion unit 27 by frequency eliminator 28 generations one pulse wave signal, after making processing and amplifying, amplifier 24 delivers to analog/digital converter 23 in addition, notifying described analog/digital converter 23 by process control unit 25 is a new numerical data (DATAnew) with the conversion of signals of analog form, and with its be stored to the storage and comparing unit 26, and deliver to dual-mode antenna group 21 through parallel/serial conversion unit 27 and launch, digiboard 10 is given in passback.
After digital signal is returned, described storage and comparing unit 26 will confirm relatively further that described digital signal is peak signal (DATAnew 〉=DATAold) again, as non-peak signal, promptly continue the electromagnetic field signal that induction receives digiboard 10 next group dispatch coil emission again; As be peak signal, promptly receive the signal of pressure transducer 201 and button 202/203;
Described action is to be to lay its transmitting coil with matrix form on digiboard 10; when cursor device 20 is positioned on the digiboard 10; it can respond to the signals that receive near the emission of many group transmitting coils; and be the intensity of guaranteeing return path signal; promptly by affirmation means; so that get the signal of intensity maximum; described affirmation means are that the data (DATAnew) with present reception receive data (DATAold) relatively with last one; as DATAnew 〉=DATAold; promptly replace DATAold by DATAnew; and lasting another DATAnew that receives; again with previous DATAold comparison; as DATAnew during less than DATAold, i.e. the previous DATAold that stores of expression was a peak signal, stopped to receive the signal of digiboard 10 immediately.
When the signal that is received from digiboard 10 to be confirmed was the strongest, described process control unit 25 promptly notified analog/digital converter 23 to read its pressure rank signal from pressure transducer 201, and was stored to storage and comparing unit 26; After described storage and comparing unit 26 read the function selecting that its status signal is the user by button 202,203 in addition, to deliver to digiboard 10 through digitized pressure signal and key-press status signal by parallel/serial conversion unit 27, dual-mode antenna group 21 immediately, subsequently DATAold is made zero, and repeating said steps.
And for example shown in Figure 2, be the circuit structure of numerical digit plate 10 inside, it is to be connected with a signal transmitting and receiving unit 30 by an analog switch 13 by many groups dispatch coil 11, it is in order to the launching simulation signal, or from the digital signal of cursor device 20 its passbacks of reception; Wherein:
Described signal transmitting and receiving unit 30 includes;
One high frequency geophone 31 is to be connected with the I/O end of described analog switch 13 by an electric capacity, enters detection in order to the digital signal that dispatch coil 11 is received and handles;
One differential amplifier 32 is output terminals of being located at high frequency geophone 31, makes processing and amplifying;
One hysteresis comparator 33 is that the output signal of differential amplifier 32 is done to confirm to handle;
One microprocessor 34, its input end are to be connected with the I/O end of analog switch 13 by described circuit, handling its passback and through the signal of demodulation, and send to computing machine; The one control output end is the control end that is connected to analog switch 13 again, switches with the transmitting-receiving of control analog switch 13;
One drive circuit 35, its input end are to be connected with a sequential generator 37 by a wave filter 36, and wherein timing sequencer 37 is controlled by microprocessor 34; Driving circuit 35 output terminals are the I/O ends that are connected to analog switch 13 by another capacitor C 1 again.
In described circuit design, be to produce clock signal by microprocessor 34 control timing generators 37, after wave filter 36 is made Filtering Processing, make driving circuit 35 produce a simulating signal and deliver to analog switch 13, utilize 34 pairs of analog switches of microprocessor 13 to switch, make simulating signal respectively by each group dispatch coil 11 emission, transmit as for it and then to adopt the LC resonance mode, wherein L promptly respectively organizes dispatch coil 11, C is the electric capacity of 13 of driving circuit 35 and analog switches, utilize this kind emission mode, directly by the mode of dispatch coil emission, has the power saving advantage compared to the conventional digital drive circuit.
As for the workflow of described circuit, please cooperate consult shown in Figure 5:
It is in Qi Shihou, and DATAold makes zero with data, and passes through the switching controls of analog switch 13, makes the electromagnetic field signal of each dispatch coil 11 launching simulation;
Receive the digital signal of its passback from cursor device 20;
Is the digital signal of judging passback peak signal DATAnew 〉=DATAold? Also promptly by affirmation means, so that get the signal of intensity maximum;
Described affirmation means are to compare with the data DATAnew of present reception and a last reception data DATAold, as DATAnew 〉=DATAold, promptly replace DATAold by DATAnew, and lasting another DATAnew that receives, again with previous DATAold relatively, as DATAnew during less than DATAold, i.e. the previous DATAold that stores of expression was a peak signal, receive pressure signal and key-press status signal that cursor device 20 is sent here immediately, and stop to launch electromagnetic field signal.
Utilize all to be received from cursor device 20 and converse the coordinate position of cursor device 20, again together with pressure signal and key-press status signal, deliver to computing machine subsequently greater than zero digital signal.
In described step, because digiboard 10 is a digital signal from the return path signal that cursor device 20 receives, thus can be directly for inner signal transmitting and receiving processing unit 30 interpretations, it need not through conversion, and signal is concrete and clear and definite.
The hardware unit that can understand coordinate input method of the present invention and carry out described method through above-mentioned explanation possesses following advantage:
1. degree of accuracy height, effectively prevent to disturb: the resonant circuit dual-mode antenna group Q value on the cursor device is quite high, so can produce higher electric current, give the cursor device of digiboard compared to existing direct passback simulating signal, inductance on the resonant circuit can use less coil turn to get final product, because the telefault number of turn the more, more disturbed, so between cursor device and digiboard, constitute the digital data transmission pattern and through the design of multiple affirmation by the present invention, can use the resonant circuit and the few inductance of the number of turn of high Q value, and effectively get rid of interference phenomenon.
2. power saving design: because the resonant circuit on the cursor device is very sensitive, thereby as long as the transmitting coil in the digiboard is emission one little electric current, can on the cursor device, produce electric current, and return a stable digital signal after treatment, penetrate the big electric current beginning compared to existing digiboard beard and hair and can guarantee the simulating signal intensity that the cursor device returns, so comparatively power saving in design.
Digiboard is originally also adopted the LC resonance mode in the aspect that transmits again, is directly outputed signal to the more power saving of mode of dispatch coil emission by driving circuit compared to the conventional digital plate.
Claims (9)
1. a coordinate input method is characterized in that, may further comprise the steps:
On digiboard, receive the electromagnetic field signal of its emission by the cursor device;
The cursor device is converted to digital signal with the electromagnetic field signal that receives;
The cursor device returns described digital signal;
Receive the digital signal of cursor device passback by digiboard, and judge further whether it is peak signal,, promptly receive the electromagnetic field signal of next group dispatch coil emission of digiboard again, till receiving peak signal as non-peak signal; As be peak signal, promptly stop to launch electromagnetic field signal, and then receive the status signal that the cursor device is sent here subsequently;
The digital signal of utilizing digiboard to receive is judged the coordinate position of cursor device on digiboard, and coordinate signal and status signal are passed to computing machine.
2. coordinate input method as claimed in claim 1 is characterized in that, the status signal of described cursor device comprises the pressure signal of pressure transducer generation and the status signal of one group of button.
3. coordinate input method as claimed in claim 1 is characterized in that, described digiboard launching simulation signal gives the cursor device and reaches the digital signal system generation simultaneously that receives its passback from the cursor device, also promptly utilizes load modulation mode to carry out.
4. coordinate entering device, it is made up of a cursor device and a digiboard; It is characterized in that:
Described cursor device includes:
One dual-mode antenna group, in order to the simulating signal of reception digiboard emission, or the passback digital signal is given digiboard;
One pulse producer, it is connected in the output terminal of dual-mode antenna group, produces an activation signal in order to the signal according to the dual-mode antenna group of received;
One analog/digital converter, its input end are to be connected with the dual-mode antenna group by an amplifier, are digital signal in order to the analog signal conversion with its reception;
One process control unit, its input end are to be connected with the output terminal of pulse producer, and its output terminal is to be connected to analog/digital converter;
One storage and competitive list do not have, and its input end is connected with output terminal and one group of button of analog/digital converter respectively; Its output terminal is to be connected to the dual-mode antenna group by a parallel/serial conversion unit;
Be provided with many group dispatch coils in the described digiboard, it is connected with a signal transmitting and receiving unit by an analog switch, and described signal transmitting and receiving unit includes:
One high frequency geophone is to be connected with the I/O end of described analog switch by an electric capacity, enters detection in order to the digital signal that dispatch coil is received and handles;
One differential amplifier is an output terminal of being located at high frequency geophone, to make processing and amplifying;
One hysteresis comparator is that the output signal of differential amplifier is done to confirm to handle;
One microprocessor, its input end are to be connected with the I/O end of analog switch by described circuit; The one control output end is connected to the control end of analog switch, switches with the transmitting-receiving of control analog switch;
One drive circuit, its input end are to be connected with a sequential generator by a wave filter, and wherein timing sequencer is controlled by microprocessor; Described driving circuit output terminal is the I/O end that is connected to analog switch by another electric capacity.
5. coordinate entering device as claimed in claim 4 is characterized in that, is provided with a frequency eliminator between its dual-mode antenna group and the parallel/serial conversion unit.
6. coordinate entering device as claimed in claim 4 is characterized in that, the LC resonant circuit that described dual-mode antenna group is made up of inductance and electric capacity.
7. coordinate entering device as claimed in claim 4 is characterized in that, described pulse producer is made up of a comparer and a RC circuit.
8. coordinate entering device as claimed in claim 4 is characterized in that, another input end of described analog/digital converter is to be connected with a pressure detector.
9. coordinate entering device as claimed in claim 4 is characterized in that, many groups dispatch coil of described digiboard be and analog switch and signal transmitting and receiving unit between electric capacity constitute LC resonance to transmit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01122363 CN1196054C (en) | 2001-07-03 | 2001-07-03 | Coordinate input method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01122363 CN1196054C (en) | 2001-07-03 | 2001-07-03 | Coordinate input method and device |
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| Publication Number | Publication Date |
|---|---|
| CN1393754A CN1393754A (en) | 2003-01-29 |
| CN1196054C true CN1196054C (en) | 2005-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01122363 Expired - Fee Related CN1196054C (en) | 2001-07-03 | 2001-07-03 | Coordinate input method and device |
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| CN (1) | CN1196054C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106843539B (en) * | 2017-01-03 | 2020-12-18 | 深圳市绘王动漫科技有限公司 | Wireless passive handwriting input system |
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| CN1393754A (en) | 2003-01-29 |
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