CN107422883A - A kind of electronic whiteboard double-pen writing method based on ultrasonic wave - Google Patents

A kind of electronic whiteboard double-pen writing method based on ultrasonic wave Download PDF

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Publication number
CN107422883A
CN107422883A CN201710678439.3A CN201710678439A CN107422883A CN 107422883 A CN107422883 A CN 107422883A CN 201710678439 A CN201710678439 A CN 201710678439A CN 107422883 A CN107422883 A CN 107422883A
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China
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pen
ultrasonic
mrow
work
infrared
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CN107422883B (en
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燕学智
王海云
孙晓颖
陈建
武秋爽
温艳鑫
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Jilin University
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Jilin University
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03545—Pens or stylus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Position Input By Displaying (AREA)

Abstract

The present invention provides a kind of electronic whiteboard double-pen writing method based on ultrasonic wave, belongs to ultrasonic pen Writing method.Including two ultrasonic pens, electronic whiteboards, two ultrasonic pens include that the infrared infrared transmitter of phase co-wavelength can be sent and can send the ultrasonic transmitter of identical frequency ultrasonic wave, the infrared signal that another ultrasonic pen is sent can be received simultaneously, to judge whether another ultrasonic pen be in running order；The present invention judges working condition and the band of position of two pens using time-multiplexed principle, realize the alternately writing work of two pens, the time reference of pen is bifurcated as area first with the different pulse widths of infrared signal, the infrared signal sent by receiving another one-pen, judge whether it is in working condition, instructed then in conjunction with the band of position for being wirelessly transferred acquisition and realize the work-based logic sequential of oneself, nib start-up operation is pressed, double-pen writing can apply to interactive electronic teaching, interactive meeting, training etc..

Description

A kind of electronic whiteboard double-pen writing method based on ultrasonic wave
Technical field
The present invention relates to a kind of ultrasonic pen Writing method, and in particular to a kind of using infrared signal is time reference based on super The electronic whiteboard double-pen writing method of sound wave, two pens can be achieved timesharing writing is carried out on electronic whiteboard, so as to preferably should For functions such as interactive electronic teaching, interactive meeting, trainings.
Background technology
With the rise and development of virtual reality technology, people are also more and more to the demand for experience of man-machine interaction product. Interactive electric whiteboard is a kind of newer product, is developed by common electronic whiteboard to come, the electronics occurred earliest Blank can only carry out some and be similar to the simple operations (copying electronic whiteboard) duplicated, and interactive electric whiteboard can be carried out Computer is communicated, and electronic whiteboard is connected with PC, and the content on PC can be shown on electronic whiteboard, can be with ultrasonic pen Instead of mouse action, any operation to file is realized, including the compiling of file, annotation etc..
The interactive electric whiteboard occurred in the market is write using single, and electronic whiteboard is in order to realize a double book Function is write, it is general using two cameras of installation, double-pen writing is realized from hardware, or believe by infrared signal and ultrasonic wave Number frequency division multiplexing by the way of notch filter circuit and digital filter are combined, realize the differentiation of multiple targets.At present There are some introductions on dual-stylus writing function.
Chinese patent " a kind of method that double-pen writing is realized based on electronic whiteboard " (application number 201210338872.X) is carried A kind of method that double-pen writing is realized based on electronic whiteboard has been supplied, has detected the shape of corresponding writing pencil respectively by two cameras State, image capture module gather the view data of each camera, and view data is arrived by image storage module storage In SDRAM chips, meanwhile, be calculated the hot spot coordinate that writing pencil leaves by image processing module, passing through PC will The coordinate of hot spot is shown to realize double-pen writing.But such method needs specific video camera to determine writing pencil Position, cost is higher, is affected by the surrounding environment larger.Chinese patent " multi-target three-dimensional ultrasonic alignment system " (201320612723.8) a kind of multi-target three-dimensional ultrasonic alignment system is proposed, on the basis of infrared signal, passes through infrared letter Number realize that multiple target is distinguished with the frequency division multiplexing of ultrasonic signal, using notch filter circuit by the way of digital filter is combined, Isolate the localization by ultrasonic signal of different target.But the method is in two ultrasonic pen transmitted waveforms and frequency all identical ultrasounds In the case of ripple signal, it cannot be distinguished by.Chinese patent " the electromagnetic induction display device of a kind of more writings simultaneously " (201420151401.2) the electromagnetic induction display device of a kind of more while writing are proposed, the utility model is by receiving line After circle receives the wave frequency signal that different time writers are sent respectively, electromagnetic signal is through analog switch, simulation frequency-selecting amplification electricity Behind road and A/D change-over circuits, data signal is converted electromagnetic signal into, is sent to processor, is handled, processor is using existing After there are the computational methods in technology to handle the written handwriting of different time writers, handwriting trace signal is transmitted to projection by computer Machine, realize the purpose of more writings.But the method must be operated using special electronic pen, and electromagnetic wave is to people's Body has certain radiation.
The content of the invention
The present invention provides a kind of electronic whiteboard double-pen writing method based on ultrasonic wave, is judged using time-multiplexed principle The working condition of two pens and the band of position, realize the alternately writing work of two pens.
The present invention adopts the technical scheme that：Including electronic whiteboard and two ultrasonic pen two parts, the electronic whiteboard bag Two signal receivers, smooth writing plane are included, signal receiver is used to receive the red of corresponding two ultrasonic pens transmitting External signal and ultrasonic signal, two ultrasonic pens include that the infrared infrared transmitter of phase co-wavelength can be sent and can sent out Go out the ultrasonic transmitter of identical frequency ultrasonic wave, and infrared signal that another ultrasonic pen send can be received and by wirelessly passing The positional information of defeated acquisition, principal and subordinate, i.e. every pen can treat as chief editor or treat as from pen two ultrasonic pens each other；Double pens Writing method comprises the following steps：
1) when any one ultrasonic pen or two ultrasonic pens are started working, ultrasonic signal and infrared is periodically launched Signal, electronic whiteboard calculate ultrasonic pen and started to write o'clock to the distance of two signal receivers；
2) distance that electronic whiteboard is obtained by step 1) calculates the position that ultrasonic pen is started to write a little on electronic whiteboard；
3) working region for position judgment ultrasonic pen a little of being started to write using obtained ultrasonic pen, generation band of position state are referred to Order, the region refer to writing region and fringe region, and the band of position status command by being wirelessly transferred acquisition send to it is super Sonic pen；
(1) make band of position status command be ' 0 ' when, ultrasonic pen writing regional work, the work period of ultrasonic pen is not Become, be T1；
(2) make band of position status command be ' 1 ' when, ultrasonic pen edge region work, now need to recalculate work Make the cycle, the work period is changed into T2；
4) during ultrasonic pen preparation, infrared judge whether it is in work shape by detecting another one-pen and whether sending State；
(1) if another one-pen does not work, the ultrasonic pen now started working is chief editor, by being wirelessly transferred acquisition ultrasonic pen Band of position status command determine that current work period chief editor presses nib and commenced work without delay：
(2) if another one-pen is in running order, now another one-pen be chief editor, the ultrasonic pen of start-up operation for from pen, When work period and the delay of current two pens are determined by the band of position status command for two ultrasonic pens for being wirelessly transferred acquisition It is long, after the complete infrared pulse of chief editor is detected after a t, then it is delayedOrAfter press nib start-up operation, i.e., from pen prepare Start working to press nib start working the used timeOr
The ultrasonic signal of two ultrasonic pens transmitting described in step 1) of the present invention is that waveform is identical, frequency is all FKHz ultrasonic wave, in order to which area bifurcates ultrasonic pen, its infrared signal cycle launched all is T1, pulse is respectively tu1、tu2, The size of electronic whiteboard is a × b smooth surface；
Ultrasonic pen described in step 1) of the present invention start to write o'clock to two signal receivers distance calculating method such as Under：
Wherein,Respectively ultrasonic pen is reached in the ultrasonic wave for point S (x, y) place transmission of starting to write and believed on electronic whiteboard Number receiver R1、R2Time, SR1、SR2Respectively to start to write o'clock to the distance of two receivers, the distance of two receiving terminals is L, C is the speed of ultrasonic propagation；
Position calculating method of the ultrasonic pen on electronic whiteboard described in step 2) of the present invention is as follows：
Wherein, if the coordinate started to write a little on electronic whiteboard is S (x, y), receiver R1Coordinate be (0,0), R2Coordinate Distance for (L, 0), while known two receivers is L；
Ultrasonic pen working region computational methods described in step 3) of the present invention are as follows：
1) work period of the ultrasonic pen on electronic whiteboard is T1, receiving terminal removes noise after receiving ultrasonic pulse, so Amplification extraction delay time signal afterwards, the time required for the information transmission of extraction to PC is calculated into person's handwriting is m, and two ultrasonic pens exist T1Interior while when working, the time of average every ultrasonic pen work isSo ultrasonic pen transmitting ultrasonic pulse connects to two Receiving end all receives the time used in ultrasonic signal and isI.e. any one receiving terminal receive farthest signal distance beSo can determine that with any one receiving terminal formed withFor the area to be worked in the circle of radius Domain is writing region, and now local command is designated as ' 0 '；
2) on electronic whiteboard, other regions in addition to region is write are fringe region, i.e.,This Time domain instruction is designated as ' 1 '；
Described in step 3) of the present invention make band of position status command be ' 1 ' when, ultrasonic pen edge region work Make, the computational methods for now recalculating the work period that ultrasonic pen can complete writing in a short time are as follows：
1) when ultrasonic pen edge region works, the position that ultrasonic pen is started to write a little is to the distance of any one receiving terminalSo ultrasonic wave is received the required time by ultrasonic wave receiving terminalS1For ultrasound The position started to write a little of pen is to the maximum distance of farthest receiving terminal, S1≥L1, ultrasonic wave is by the time needed for the reception of farthest receiving terminal： tS=S1/c；
2) it is m that the time required for the information transmission of extraction to PC to be calculated to person's handwriting, which has altogether, needs the time to be more than c altogether +t1, less than c+ts, andThe time that two pens complete writing within the cycle extends toAt this moment will be total Work period extend to T2；
Step 3) of the present invention is started to write the working region of position judgment ultrasonic pen a little using obtained ultrasonic pen, when two Branch pen works simultaneously when, four kinds of situations occur in the working region where two pens：
1) chief editor is writing regional work ' 0 ', from pen in writing regional work ' 0 '；
2) chief editor is writing regional work ' 1 ', from an edge region job ' 0 '；
3) chief editor's edge region work ' 0 ', from pen in writing regional work ' 1 '；
4) chief editor's edge region work ' 1 ', from an edge region job ' 1 '；
Appearance situation 1) when, two ultrasonic pens are all writing regional work, now two ultrasonic pen being averaged within the cycle Writing time is allWriting can be completed within the work period, now it is constant to obtain work period work for two pens；
Appearance situation 2) when, if chief editor is in the writing regional work timeFrom an edge region job, now on side T the time required to the ultrasonic pulse that the ultrasonic pen in edge region is sent is received by the ultrasonic wave receiving terminal of maximum distance1=L1/ c, will Time required for the information transmission of extraction calculates person's handwriting to PC is altogether m, needs the time to be more than altogetherSo needed from pen Work period it will extend to T2, while delay is changed toChief editor in order to which signal conflict does not occur in stable write and from pen, The pulse period of chief editor is also changed to T2, while delay is changed to
Appearance situation 3) if when the work of chief editor edge region, the ultrasonic wave arteries and veins that now ultrasonic pen of edge region is sent Punching is received by longer-distance ultrasonic wave receiving terminal, required time t1=L1/ c, the information transmission of extraction to PC is calculated into person's handwriting It is m that the required time, which has altogether, needs the time to be more than altogetherSo need to be delayed from ultrasonic penStart to launch oneself afterwards Infrared pulse, total work period is at this moment extended into T2, T is also changed to from the pulse period of pen2, while delay is changed to
Appearance situation 4) when, two equal edge regions of pen, at this moment the time cycle be changed to T2Effective infrared pulse, together When delay be changed to the half in cycle
Infrared judge whether it is in work by detecting another one-pen and whether sending described in step 4) of the present invention Refer to, when ultrasonic pen detects other infrared signal, illustrate there are other pens working, if not detecting red as state External signal, illustrate working without other pens；
If the another one-pen described in step 4) of the present invention is in running order, now another one-pen is chief editor, is opened The ultrasonic pen of beginning work is from pen, after the complete infrared pulse of chief editor is detected after a t, then is delayedOrAfter press nib Start working, refer specifically to：When two pens are all writing regional work, it is delayed from penAfter work, when in two ultrasonic pens Any one or two all edge region work when, from pen be delayedAfter start working.
Being started working the used time from pen preparation start-up operation to nib is pressed described in step 4) of the present invention OrComputational methods are as follows：
When two pens are writing regional work simultaneously, it is necessary to total used time duration when preparing to start working out of pen the cycle Computational methods it is as follows：
1) when preparing to start working in the second half of the cycle that chief editor works from pen, detected after t complete effective Infrared pulse,So pen is after effective infrared pulse is detected, then it is delayedAfter press nib and start Launch the infrared pulse of oneself, so launching the infrared pulse used time of oneself from pen from preparing to start working to pressing nib
2) just prepare to start working when chief editor launches infrared pulse when from pen, delay is carved from standing erectAfter press nib Start to launch the infrared signal of oneself, so launching the infrared pulse used time of oneself from pen from preparing to start working to pressing nibT=tu1；
3) prepare to start working when chief editor just has begun to launch infrared pulse when from pen, now miss chief editor's Rising edge pulse, it is believed that the pulse is invalid, continues to detect from pen, until detecting complete infrared pulse, so t ∈ (T1,T1+tu1), then be delayedNib is pressed afterwards to start to launch the infrared pulse of oneself, is detected from pen from the preparation moment Launch the infrared pulse used time of oneself
4) when from pen just chief editor launch infrared pulse trailing edge when preparation, lack the rising of infrared pulse Edge, is judged as incomplete infrared pulse, and it is invalid now to think the pulse, so the pen continues to detect, until detecting Complete effective infrared pulse, in t=T1Complete infrared pulse is detected, then is delayedPress nib and send the infrared of oneself Pulse, used time
5) when preparing to start working in the preceding half period that chief editor works from pen, detected after t complete effective Infrared pulse,It is delayed againPress nib and send the infrared pulse of oneself, so accurate from pen from starting Standby work starts to launch the infrared pulse of oneself, used time to after detecting complete effective infrared pulse
When two pens have one or two all edge region work, the work period is changed into T2, it is delayed be changed to accordingly
The method have the advantages that judging working condition and the band of position of two pens using time-multiplexed principle, two are realized Pen within the work period alternating writing work, first with infrared signal different pulse widths as area bifurcation pen when Between benchmark, the infrared signal sent by receiving another one-pen, judge whether it is in working condition, then in conjunction with being wirelessly transferred The band of position status command of acquisition realizes the work-based logic sequential of oneself, presses nib start-up operation.Double-pen writing can be used In interactive electronic teaching, interactive meeting, training etc..
Brief description of the drawings
Fig. 1 is the structural representation of electronic whiteboard of the present invention；
Fig. 2 is the structural representation of ultrasonic pen of the present invention；
Fig. 3 is ultrasonic electronic blank positioning schematic of the present invention；
Fig. 4 is ultrasonic pen working region of the present invention schematic diagram；
Fig. 5 is that the present invention launches effective infrared pulse coding timing diagram from pen；
Fig. 5 A are 1. the present invention prepares start-up operation timing diagram from pen in region；
Fig. 5 B are 2. the present invention prepares start-up operation timing diagram from pen in region；
Fig. 5 C are 3. the present invention prepares start-up operation timing diagram from pen in region；
Fig. 5 D are 4. the present invention prepares start-up operation timing diagram from pen in region；
Fig. 5 E are 5. the present invention prepares start-up operation timing diagram from pen in region；
Fig. 6 is double-pen writing flow chart of the present invention.
Embodiment
Including electronic whiteboard and two ultrasonic pen two parts, the electronic whiteboard includes two signal receivers, smooth book Plane is write, signal receiver is used for the infrared signal and ultrasonic signal for receiving corresponding two ultrasonic pens transmitting, described Two ultrasonic pens include that the infrared infrared transmitter of phase co-wavelength can be sent and can send the ultrasound of identical frequency ultrasonic wave Wave launcher, and the infrared signal that another ultrasonic pen send and the positional information by being wirelessly transferred acquisition can be received, two Principal and subordinate, i.e. every pen can treat as chief editor or treat as from pen ultrasonic pen each other；Double-pen writing method comprises the following steps：
1) when any one ultrasonic pen or two ultrasonic pens are started working, ultrasonic signal and infrared is periodically launched Signal, electronic whiteboard calculate ultrasonic pen and started to write o'clock to the distance of two signal receivers；
2) distance that electronic whiteboard is obtained by step 1) calculates the position that ultrasonic pen is started to write a little on electronic whiteboard；
3) working region for position judgment ultrasonic pen a little of being started to write using obtained ultrasonic pen, generation band of position state are referred to Order, the region refer to writing region and fringe region, and the band of position status command by being wirelessly transferred acquisition send to it is super Sonic pen；
(1) make band of position status command be ' 0 ' when, ultrasonic pen writing regional work, the work period of ultrasonic pen is not Become, be T1；
(2) make band of position status command be ' 1 ' when, ultrasonic pen edge region work, now need to recalculate work Make the cycle, the work period is changed into T2；
4) during ultrasonic pen preparation, infrared judge whether it is in work shape by detecting another one-pen and whether sending State；
(1) if another one-pen does not work, the ultrasonic pen now started working is chief editor, by being wirelessly transferred acquisition ultrasonic pen Band of position status command determine that current work period chief editor presses nib and commenced work without delay：
(2) if another one-pen is in running order, now another one-pen be chief editor, the ultrasonic pen of start-up operation for from pen, When work period and the delay of current two pens are determined by the band of position status command for two ultrasonic pens for being wirelessly transferred acquisition It is long, after the complete infrared pulse of chief editor is detected after a t, then it is delayedOrAfter press nib start-up operation, i.e., from pen prepare Start working to press nib start working the used timeOr
The ultrasonic signal of two ultrasonic pens transmitting described in step 1) of the present invention is that waveform is identical, frequency is all FKHz ultrasonic wave, in order to which area bifurcates ultrasonic pen, its infrared signal cycle launched all is T1, pulse is respectively tu1、tu2, The size of electronic whiteboard is a × b smooth surface；
Ultrasonic pen described in step 1) of the present invention start to write o'clock to two signal receivers distance calculating method such as Under：
Wherein,Respectively ultrasonic pen is reached in the ultrasonic wave for point S (x, y) place transmission of starting to write and believed on electronic whiteboard Number receiver R1、R2Time, SR1、SR2Respectively to start to write o'clock to the distance of two receivers, the distance of two receiving terminals is L, C is the speed of ultrasonic propagation；
Position calculating method of the ultrasonic pen on electronic whiteboard described in step 2) of the present invention is as follows：
Wherein, if the coordinate started to write a little on electronic whiteboard is S (x, y), receiver R1Coordinate be (0,0), R2Coordinate Distance for (L, 0), while known two receivers is L；
Ultrasonic pen working region computational methods described in step 3) of the present invention are as follows：
1) work period of the ultrasonic pen on electronic whiteboard is T1, receiving terminal removes noise after receiving ultrasonic pulse, so Amplification extraction delay time signal afterwards, the time required for the information transmission of extraction to PC is calculated into person's handwriting is m, and two ultrasonic pens exist T1Interior while when working, the time of average every ultrasonic pen work isSo ultrasonic pen transmitting ultrasonic pulse connects to two Receiving end all receives the time used in ultrasonic signal and isI.e. any one receiving terminal receive farthest signal distance beSo can determine that with any one receiving terminal formed withFor the area to be worked in the circle of radius Domain is writing region, and now local command is designated as ' 0 '；
2) on electronic whiteboard, other regions in addition to region is write are fringe region, i.e.,This Time domain instruction is designated as ' 1 '；
Described in step 3) of the present invention make band of position status command be ' 1 ' when, ultrasonic pen edge region work Make, the computational methods for now recalculating the work period that ultrasonic pen can complete writing in a short time are as follows：
1) when ultrasonic pen edge region works, the position that ultrasonic pen is started to write a little is to the distance of any one receiving terminalSo ultrasonic wave is received the required time by ultrasonic wave receiving terminalS1For ultrasound The position started to write a little of pen is to the maximum distance of farthest receiving terminal, S1≥L1, ultrasonic wave is by the time needed for the reception of farthest receiving terminal： tS=S1/c；
2) it is m that the time required for the information transmission of extraction to PC to be calculated to person's handwriting, which has altogether, needs the time to be more than c altogether +t1, less than c+ts, andThe time that two pens complete writing within the cycle extends toAt this moment will be total Work period extends to T2；
Step 3) of the present invention is started to write the working region of position judgment ultrasonic pen a little using obtained ultrasonic pen, when two Branch pen works simultaneously when, four kinds of situations occur in the working region where two pens：
1) chief editor is writing regional work ' 0 ', from pen in writing regional work ' 0 '；
2) chief editor is writing regional work ' 1 ', from an edge region job ' 0 '；
3) chief editor's edge region work ' 0 ', from pen in writing regional work ' 1 '；
4) chief editor's edge region work ' 1 ', from an edge region job ' 1 '；
Appearance situation 1) when, two ultrasonic pens are all writing regional work, now two ultrasonic pen being averaged within the cycle Writing time is allWriting can be completed within the work period, now it is constant to obtain work period work for two pens；
Appearance situation 2) when, if chief editor is in the writing regional work timeFrom an edge region job, now on side T the time required to the ultrasonic pulse that the ultrasonic pen in edge region is sent is received by the ultrasonic wave receiving terminal of maximum distance1=L1/ c, will Time required for the information transmission of extraction calculates person's handwriting to PC is altogether m, needs the time to be more than altogetherSo needed from pen Work period it will extend to T2, while delay is changed toChief editor in order to which signal conflict does not occur in stable write and from pen, The pulse period of chief editor is also changed to T2, while delay is changed to
Appearance situation 3) if when the work of chief editor edge region, the ultrasonic wave arteries and veins that now ultrasonic pen of edge region is sent Punching is received by longer-distance ultrasonic wave receiving terminal, required time t1=L1/ c, the information transmission of extraction to PC is calculated into person's handwriting It is m that the required time, which has altogether, needs the time to be more than altogetherSo need to be delayed from ultrasonic penStart to launch oneself afterwards Infrared pulse, total work period is at this moment extended into T2, T is also changed to from the pulse period of pen2, while delay is changed to
Appearance situation 4) when, two equal edge regions of pen, at this moment the time cycle be changed to T2Effective infrared pulse, together When delay be changed to the half in cycle
Infrared judge whether it is in work by detecting another one-pen and whether sending described in step 4) of the present invention Refer to, when ultrasonic pen detects other infrared signal, illustrate there are other pens working, if not detecting red as state External signal, illustrate working without other pens；
If the another one-pen described in step 4) of the present invention is in running order, now another one-pen is chief editor, is opened The ultrasonic pen of beginning work is from pen, after the complete infrared pulse of chief editor is detected after a t, then is delayedOrAfter press nib Start working, refer specifically to：When two pens are all writing regional work, it is delayed from penAfter work, when in two ultrasonic pens Any one or two all edge region work when, from pen be delayedAfter start working.
Being started working the used time from pen preparation start-up operation to nib is pressed described in step 4) of the present invention OrComputational methods are as follows：
When two pens are writing regional work simultaneously, it is necessary to total used time duration when preparing to start working out of pen the cycle Computational methods it is as follows：
1) when preparing to start working in the second half of the cycle that chief editor works from pen, detected after t complete effective Infrared pulse,So pen is after effective infrared pulse is detected, then it is delayedAfter press nib and start Launch the infrared pulse of oneself, so launching the infrared pulse used time of oneself from pen from preparing to start working to pressing nib
2) just prepare to start working when chief editor launches infrared pulse when from pen, delay is carved from standing erectAfter press nib Start to launch the infrared signal of oneself, so launching the infrared pulse used time of oneself from pen from preparing to start working to pressing nibT=tu1；
3) prepare to start working when chief editor just has begun to launch infrared pulse when from pen, now miss chief editor's Rising edge pulse, it is believed that the pulse is invalid, continues to detect from pen, until detecting complete infrared pulse, so t ∈ (T1,T1+tu1), then be delayedNib is pressed afterwards to start to launch the infrared pulse of oneself, is detected from pen from the preparation moment Launch the infrared pulse used time of oneself
4) when from pen just chief editor launch infrared pulse trailing edge when preparation, lack the rising of infrared pulse Edge, is judged as incomplete infrared pulse, and it is invalid now to think the pulse, so the pen continues to detect, until detecting Complete effective infrared pulse, in t=T1Complete infrared pulse is detected, then is delayedPress nib and send the infrared of oneself Pulse, used time
5) when preparing to start working in the preceding half period that chief editor works from pen, detected after t complete effective Infrared pulse,It is delayed againPress nib and send the infrared pulse of oneself, so accurate from pen from starting Standby work starts to launch the infrared pulse of oneself, used time to after detecting complete effective infrared pulse
When two pens have one or two all edge region work, the work period is changed into T2, it is delayed be changed to accordingly
In order that those skilled in the art are better understood from the present invention, below in conjunction with the accompanying drawings with instantiation to the present invention It is described in further detail.
1st, the ultrasonic pen electronic whiteboard composition schematic diagram that Fig. 1 and Fig. 2 applies for the present invention, including electronic whiteboard 100 and sky The two parts of mouse pen 200, electronic whiteboard 100 mainly include blank 101 and 2 signal receivers 1 and signal receiver two 103, signal receiver primary recipient ultrasonic signal and infrared signal；Ultrasonic pen 200 mainly includes nib 201, PVDF ultrasounds Film 202, infrared transmitting tube 203, button 204, infrared receiving tube 206 and microprocessor [205 etc.；Specific ultrasonic pen is started to write Point preparation method refers to Fig. 3, and 300, when triggering the button 204 of ultrasonic pen on writing plane 301, PVDF ultrasonic membranes 202 And infrared transmitting tube 203 launches ultrasonic signal and infrared signal to signal generator 303 and 304, differentiation is used as using infrared signal The time reference of two pens, ultrasonic pen pen is positioned by ultrasonic positioning techniques, and then obtain the position coordinates S of ultrasonic pen (x, y) 302, in this real system, we are 40KHz given the ultrasonic signal frequency that two ultrasonic pens are launched, its The infrared signal cycle of transmitting is all T1=16ms, pulse are respectively tu1=176us, tu2=180us, the size of electronic whiteboard For 2m × 1.2m smooth surface.
The distance calculating method that ultrasonic pen is started to write o'clock to two ultrasonic receivers is as follows：
Wherein,Respectively ultrasonic pen is reached in the ultrasonic wave for point S (x, y) place transmission of starting to write and believed on electronic whiteboard Number receiver R1、R2Time, SR1、SR2Respectively start to write o'clock to the distance of two receivers, the distance of two receiving terminals is L, c；
Position calculating method of the ultrasonic pen on electronic whiteboard is as follows：
Wherein, if the coordinate started to write a little on electronic whiteboard is S (x, y), receiver R1Coordinate be (0,0), R2Coordinate Distance for (L, 0), while known two receivers is L；
2nd, with reference first to Fig. 4, Fig. 4 is ultrasonic pen working region schematic diagram 400, when triggering the button 204 of ultrasonic pen, PVDF Ultrasonic membrane 202 and infrared transmitting tube 203 launch ultrasonic signal and infrared signal respectively, and signal transmitting terminal 403 receives ultrasound The ultrasonic signal and infrared signal, specific ultrasonic pen working region computational methods of pen transmitting are as follows：
1) work period of the ultrasonic pen on electronic whiteboard is T1, receiving terminal 403 removes noise after receiving ultrasonic pulse, Then amplification extraction delay time signal, it is m by the time required for the information transmission of extraction to PC calculating person's handwriting, two ultrasonic pens In T1Interior while when working, the time of average every ultrasonic pen work isSo ultrasonic pen launches ultrasonic pulse to two Receiving terminal 403 all receives the time used in ultrasonic signal and isThe farthest signal that i.e. any one receiving terminal receives Distance 404 isSo can determine that with any one receiving terminal formed withFor in the circle of radius The region of work is writing region [402], and now local command is designated as ' 0 '
2) on electronic whiteboard, other regions in addition to region is write are fringe region [401], i.e., Now local command is designated as ' 1 '；
When ultrasonic pen edge region works, the computational methods of work period of writing can be completed by recalculating ultrasonic pen It is as follows：
1) when ultrasonic pen edge region works, the position that ultrasonic pen is started to write a little is to the distance of any one receiving terminalSo ultrasonic wave is received the required time by ultrasonic wave receiving terminalS is ultrasound The position started to write a little of pen is to the maximum distance of farthest receiving terminal, S1≥L1, ultrasonic wave is by the time needed for the reception of farthest receiving terminal： tS=S1/c；
2) it is m that the time required for the information transmission of extraction to PC to be calculated to person's handwriting, which has altogether, needs the time to be more than c altogether +t1, it is less thanThe time that two pens complete writing within the cycle extends toAt this moment by total work week Phase extends to T2, in a practical situation, the c=4ms t that we survey1>4ms, tS=8.79ms, S1=1.63m, T2=18ms, L =0.16m, c=340m/s；
When two pens work simultaneously, four kinds of situations occur in the working region where two pens：
1), chief editor works ' 0 ' in writing region 402, and ' 0 ' is worked in writing region 402 from pen；
2), chief editor works ' 1 ' in writing region 402, and ' 0 ' is worked from an edge region 401；
3), chief editor's edge region 401 works ' 0 ', and ' 1 ' is worked in writing region 402 from pen；
4), chief editor's edge region 401 works ' 1 ', and ' 1 ' is worked from an edge region 401；
Appearance situation 1) when, two ultrasonic pens all work in writing region 402, and now two ultrasonic pens are flat within the cycle Equal writing time is all 8ms, and writing can be completed within the work period, and now it is constant to obtain work period work for two pens；
Appearance situation 2) when, if chief editor is 8ms in the writing working time of region 402, worked from an edge region 401, The time required to the ultrasonic pulse that now ultrasonic pen of edge region 401 is sent is received by the ultrasonic wave receiving terminal of maximum distance t1=L1/c>4ms, it is 4ms that the time required for the information transmission of extraction to PC to be calculated to person's handwriting, which has altogether, needs the time altogether More than 8ms, so need work period extending to 18ms from pen, while delay is changed to 9ms, chief editor is in order in stable write Signal conflict does not occur with from pen, the pulse period of chief editor is also changed to 18ms, while delay is changed to 9ms；
Appearance situation 3) if when chief editor edge region 401 work, now the ultrasonic pen of edge region 401 is sent super Sound wave pulse is received by longer-distance ultrasonic wave receiving terminal, required time t1=L1/ c, by the information transmission of extraction to PC meter It is 4ms that time required for calculating person's handwriting, which has altogether, needs the time to be more than 8ms altogether, so since ultrasonic pen needs after delay 9ms Launch the infrared pulse of oneself, total work period is at this moment extended into 18ms, be also changed to 18ms from the pulse period of pen, simultaneously Delay is changed to 9ms；
Appearance situation 4) when, the equal edge region 401 of two pens, at this moment the time cycle be changed to 18ms effective infrared arteries and veins Punching, while delay is changed to the half 9ms in cycle；
Fig. 5 is that chief editor launches effective infrared pulse coding timing diagram 500, is existed from pen in region 501, region 502, region 503rd, region 504, region 505 begin preparing for the situation of work, and the cycle of chief editor's work be 16ms, that is to say, that from pen preparation This 16ms any time can be appeared at the time of work, Fig. 5 A, Fig. 5 B, Fig. 5 C, Fig. 5 D, Fig. 5 E are respectively in a cycle From preparation at the time of the whole circumstances.
Fig. 5 A be from pen prepare to start working the moment appear in region 1. when timing diagram 501, it is later half in the cycle from pen Prepare to start working during individual cycle 5010, complete effective infrared pulse, t ∈ (176us, 8ms+ are detected after tms 176us), so from pen after effective infrared pulse is detected, delay 8ms presses nib 5011, starts to launch the red of oneself Outer pulse, so being started working used time t+8ms from pen from preparation start-up operation to nib is pressed.
Fig. 5 B just launch infrared from timing diagram when appearing in region 2. at the pen preparation start-up operation moment from pen in chief editor Prepare start-up operation 5020 during pulse, launch the infrared signal of oneself since standing erect to carve delay 8ms presses nib 5021, so Started working used time t+8ms from pen from preparation start-up operation to nib is pressed, t=176us.
Fig. 5 C just launch from the timing diagram 503 when appearing in region 3. at the pen preparation start-up operation moment from pen in chief editor Prepare start-up operation 5030 during infrared pulse, just miss the rising edge of chief editor, it is invalid now to think the pulse, from pen Continue to detect, until detecting complete infrared pulse, so pressing nib after t ∈ (16ms, 16+176us), the 8ms that is delayed 5031 start to launch the infrared pulse of oneself, from pen from prepare start working when to launch the infrared pulse used time t+8ms of oneself.
Fig. 5 D just launch from the timing diagram 504 when appearing in region 4. at the pen preparation start-up operation moment from pen in chief editor Prepare start-up operation 5040 during the trailing edge of infrared pulse, lack the rising edge of infrared pulse, be judged as incomplete infrared arteries and veins Punching, it is invalid now to think the pulse, so the pen continues to detect, until detecting complete effective infrared pulse, in t= 16ms detects complete infrared pulse, and pressing nib 5041 after the 8ms that is delayed sends the infrared pulse of oneself, used time t+8ms.
Fig. 5 E are from the timing diagram 505 when appearing in region 5. at the pen preparation start-up operation moment, from pen before chief editor works Half period prepares start-up operation 5050, and complete effective infrared pulse, t ∈ (8+176us, 16ms), institute are detected after tms Start to launch the infrared pulse of oneself, used time to press nib 5051 after second pen detects complete effective infrared pulse t+8ms。
Whether Fig. 6 is double-pen writing flow chart 600, carry out initialization 602 to the ultrasonic pen of preparation, have around detection It is infrared to have 603, if detect infrared judgement it is infrared be that chief editor sends or interference signal 604, if infrared is that chief editor sends , then the infrared flag bit for setting chief editor to launch is 1, while starts timer 605, and the position started to write a little by principal and subordinate's pen, Judge the accumulative timing upper limit (16ms or 18ms) of timer, then press from a nib 606, in the case of having chief editor's work 607 computation delay times were simultaneously delayed 608, launched ultrasonic wave and infrared by 609, continued to detect infrared；If after pressing nib, without other Pen is working, then timer clear 0 610, continues to detect infrared.
Described above is directed to specific embodiment, and in the implementation process of reality, the embodiment of description can be carried out Others deformation and modification, to realize more operations or more easily write.Thus, these descriptions should be understood that only right Various principles illustrate, rather than limit the invention.

Claims (10)

  1. A kind of 1. electronic whiteboard double-pen writing method based on ultrasonic wave, it is characterised in that：Including electronic whiteboard and two ultrasounds Two parts, the electronic whiteboard include two signal receivers, smooth writing plane, and signal receiver is used to receive corresponding institute The infrared signal and ultrasonic signal of two ultrasonic pen transmittings are stated, two ultrasonic pens are red including that can send phase co-wavelength Outer infrared transmitter and the ultrasonic transmitter of identical frequency ultrasonic wave can be sent, and another ultrasonic pen hair can be received The infrared signal gone out and the positional information by being wirelessly transferred acquisition, principal and subordinate, i.e. every pen can both be treated as two ultrasonic pens each other Chief editor can also treat as from pen；Double-pen writing method comprises the following steps：
    1) when any one ultrasonic pen or two ultrasonic pens are started working, ultrasonic signal and infrared letter are periodically launched Number, electronic whiteboard calculates ultrasonic pen and started to write o'clock to the distance of two signal receivers；
    2) distance that electronic whiteboard is obtained by step 1) calculates the position that ultrasonic pen is started to write a little on electronic whiteboard；
    3) working region for position judgment ultrasonic pen a little of being started to write using obtained ultrasonic pen, generates band of position status command, The region refers to writing region and fringe region, and the band of position status command by being wirelessly transferred acquisition sends ultrasound to Pen；
    (1) make band of position status command be ' 0 ' when, ultrasonic pen writing regional work, the work period of ultrasonic pen is constant, is T1；
    (2) make band of position status command be ' 1 ' when, ultrasonic pen edge region work, now need to recalculate work week Phase, work period are changed into T2；
    4) during ultrasonic pen preparation, infrared judge whether it is in running order by detecting another one-pen and whether sending；
    (1) if another one-pen does not work, the ultrasonic pen now started working is chief editor, and the position of ultrasonic pen is obtained by being wirelessly transferred Put zone state instruction and determine that current work period chief editor presses nib and commenced work without delay：
    (2) if another one-pen is in running order, now another one-pen is chief editor, and the ultrasonic pen of start-up operation is from pen, by nothing The band of position status command for two ultrasonic pens that line transmission obtains determines work period and the delay duration of current two pens, from After detecting the complete infrared pulse of chief editor after t, then it is delayedOrAfter press nib start-up operation, i.e., since pen prepare Work to press nib start working the used timeOr
  2. A kind of 2. electronic whiteboard double-pen writing method based on ultrasonic wave according to claim 1, it is characterised in that：It is described The ultrasonic signal of two ultrasonic pens transmitting described in step 1) is the ultrasonic wave that waveform is identical, frequency is all fKHz, in order to Area bifurcates ultrasonic pen, and its infrared signal cycle launched all is T1, pulse is respectively tu1、tu2, the size of electronic whiteboard is a × b smooth surface.
  3. A kind of 3. electronic whiteboard double-pen writing method based on ultrasonic wave according to claim 1, it is characterised in that：It is described The distance calculating method that ultrasonic pen described in step 1) is started to write o'clock to two signal receivers is as follows：
    <mrow> <msub> <mi>SR</mi> <mn>1</mn> </msub> <mo>=</mo> <msub> <mi>&amp;tau;</mi> <mrow> <msub> <mi>SR</mi> <mn>1</mn> </msub> </mrow> </msub> <mo>&amp;times;</mo> <mi>c</mi> </mrow>
    <mrow> <msub> <mi>SR</mi> <mn>2</mn> </msub> <mo>=</mo> <msub> <mi>&amp;tau;</mi> <mrow> <msub> <mi>SR</mi> <mn>2</mn> </msub> </mrow> </msub> <mo>&amp;times;</mo> <mi>c</mi> </mrow>
    Wherein,Respectively ultrasonic pen reaches signal on electronic whiteboard in the ultrasonic wave for point S (x, y) place transmission of starting to write and connect Receive device R1、R2Time, SR1、SR2Respectively start to write o'clock to the distance of two receivers, the distance of two receiving terminals is L, and c is The speed of ultrasonic propagation.
  4. A kind of 4. electronic whiteboard double-pen writing method based on ultrasonic wave according to claim 1, it is characterised in that：It is described Position calculating method of the ultrasonic pen on electronic whiteboard described in step 2) is as follows：
    <mrow> <mfenced open = "{" close = "}"> <mtable> <mtr> <mtd> <mrow> <msub> <mi>SR</mi> <mn>1</mn> </msub> <mo>=</mo> <msqrt> <mrow> <msup> <mi>x</mi> <mn>2</mn> </msup> <mo>+</mo> <mi>y</mi> </mrow> </msqrt> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>SR</mi> <mn>2</mn> </msub> <mo>=</mo> <msqrt> <mrow> <msup> <mrow> <mo>(</mo> <mi>x</mi> <mo>-</mo> <mi>L</mi> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>+</mo> <msup> <mi>y</mi> <mn>2</mn> </msup> </mrow> </msqrt> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> <mfenced open = "{" close = "}"> <mtable> <mtr> <mtd> <mrow> <mi>x</mi> <mo>=</mo> <mfrac> <mrow> <msup> <mi>L</mi> <mn>2</mn> </msup> <mo>-</mo> <msup> <mrow> <mo>(</mo> <msub> <mi>c&amp;tau;</mi> <mrow> <msub> <mi>SR</mi> <mn>1</mn> </msub> </mrow> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>+</mo> <msup> <mrow> <mo>(</mo> <msub> <mi>c&amp;tau;</mi> <mrow> <msub> <mi>SR</mi> <mn>2</mn> </msub> </mrow> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mrow> <mrow> <mn>2</mn> <mi>L</mi> </mrow> </mfrac> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>y</mi> <mo>=</mo> <msqrt> <mrow> <msup> <mrow> <mo>(</mo> <msub> <mi>c&amp;tau;</mi> <mrow> <msub> <mi>SR</mi> <mn>1</mn> </msub> </mrow> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>-</mo> <msup> <mi>x</mi> <mn>2</mn> </msup> </mrow> </msqrt> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
    Wherein, if the coordinate started to write a little on electronic whiteboard is S (x, y), receiver R1Coordinate be (0,0), R2Coordinate be (L, 0), while the distance of known two receivers is L.
  5. A kind of 5. electronic whiteboard double-pen writing method based on ultrasonic wave according to claim 1, it is characterised in that：It is described Ultrasonic pen working region computational methods described in step 3) are as follows：
    1) work period of the ultrasonic pen on electronic whiteboard is T1, receiving terminal removes noise after receiving ultrasonic pulse, then amplifies Delay time signal is extracted, the time required for the information transmission of extraction to PC is calculated into person's handwriting is m, and two ultrasonic pens are in T1It is interior same When working, the time of average every ultrasonic pen work isSo ultrasonic pen transmitting ultrasonic pulse is complete to two receiving terminals Portion receives the time used in ultrasonic signal and isI.e. any one receiving terminal receive farthest signal distance beSo can determine that with any one receiving terminal formed withFor the area to be worked in the circle of radius Domain is writing region, and now local command is designated as ' 0 '；
    2) on electronic whiteboard, other regions in addition to region is write are fringe region, i.e.,This time domain Instruction is designated as ' 1 '.
  6. A kind of 6. electronic whiteboard double-pen writing method based on ultrasonic wave according to claim 1, it is characterised in that：It is described Described in step 3) make band of position status command be ' 1 ' when, ultrasonic pen edge region work, now recalculate ultrasound The computational methods that pen can complete the work period of writing in a short time are as follows：
    1) when ultrasonic pen edge region works, the position that ultrasonic pen is started to write a little is to the distance of any one receiving terminalSo ultrasonic wave is received the required time by ultrasonic wave receiving terminalS1For ultrasound The position started to write a little of pen is to the maximum distance of farthest receiving terminal, S1≥L1, ultrasonic wave is by the time needed for the reception of farthest receiving terminal： tS=S1/c；
    2) it is m that the time required for the information transmission of extraction to PC to be calculated to person's handwriting, which has altogether, needs the time to be more than c+t altogether1, Less than c+ts, andThe time that two pens complete writing within the cycle extends toAt this moment by total work Make cycle stretch-out to T2。
  7. A kind of 7. electronic whiteboard double-pen writing method based on ultrasonic wave according to claim 1, it is characterised in that：It is described Step 3) is started to write the working region of position judgment ultrasonic pen a little using obtained ultrasonic pen, when two pens while when working, two Four kinds of situations occur in working region where branch pen：
    1) chief editor is writing regional work ' 0 ', from pen in writing regional work ' 0 '；
    2) chief editor is writing regional work ' 1 ', from an edge region job ' 0 '；
    3) chief editor's edge region work ' 0 ', from pen in writing regional work ' 1 '；
    4) chief editor's edge region work ' 1 ', from an edge region job ' 1 '；
    Appearance situation 1) when, two ultrasonic pens are all in writing regional work, now average writing of two ultrasonic pens within the cycle Time is allWriting can be completed within the work period, now it is constant to obtain work period work for two pens；
    Appearance situation 2) when, if chief editor is in the writing regional work timeFrom an edge region job, now in marginal zone T the time required to the ultrasonic pulse that the ultrasonic pen in domain is sent is received by the ultrasonic wave receiving terminal of maximum distance1=L1/ c, it will extract Information transmission to PC calculate person's handwriting required for time have altogether be m, need the time to be more than altogetherSo from pen need by Work period extends to T2, while delay is changed toChief editor in stable write and from pen in order to not occur signal conflict, chief editor Pulse period be also changed to T2, while delay is changed to
    Appearance situation 3) if when the work of chief editor edge region, the ultrasonic pulse quilt that now ultrasonic pen of edge region is sent Longer-distance ultrasonic wave receiving terminal receives, required time t1=L1/ c, the information transmission of extraction to PC is calculated needed for person's handwriting It is m that the time wanted, which has altogether, needs the time to be more than altogetherSo need to be delayed from ultrasonic penStart to launch the red of oneself afterwards Outer pulse, total work period is at this moment extended into T2, T is also changed to from the pulse period of pen2, while delay is changed to
    Appearance situation 4) when, two equal edge regions of pen, at this moment the time cycle be changed to T2Effective infrared pulse, same to time delay The half in Shi Gaiwei cycles
  8. A kind of 8. electronic whiteboard double-pen writing method based on ultrasonic wave according to claim 1, it is characterised in that：It is described Infrared judge that it whether in running order refers to work as ultrasonic pen by detecting another one-pen and whether sending described in step 4) When detecting other infrared signal, illustrate there are other pens working, if not detecting infrared signal, illustrate without other Pen is working.
  9. A kind of 9. electronic whiteboard double-pen writing method based on ultrasonic wave according to claim 1, it is characterised in that：It is described If the another one-pen described in step 4) is in running order, now another one-pen is chief editor, the ultrasonic pen of start-up operation be from Pen, after the complete infrared pulse of chief editor is detected after a t, then is delayedOrAfter press nib start-up operation, refer specifically to：When Two pens are delayed all when writing regional work from penAfter work, when any one in two ultrasonic pens or two exist When fringe region works, it is delayed from penAfter start working.
  10. A kind of 10. electronic whiteboard double-pen writing method based on ultrasonic wave according to claim 1, it is characterised in that：Institute State being started working the used time from pen preparation start-up operation to nib is pressed described in step 4)OrComputational methods It is as follows：
    When two pens are writing regional work simultaneously, it is necessary to the meter of total used time duration when preparing to start working out of pen the cycle Calculation method is as follows：
    1) when preparing to start working in the second half of the cycle that chief editor works from pen, detected after t complete effective infrared Pulse,So pen is after effective infrared pulse is detected, then it is delayedAfter press nib and start to launch The infrared pulse of oneself, so launching the infrared pulse used time of oneself from pen from preparing to start working to pressing nib
    2) just prepare to start working when chief editor launches infrared pulse when from pen, delay is carved from standing erectAfter press nib and start Launch the infrared signal of oneself, so launching the infrared pulse used time of oneself from pen from preparing to start working to pressing nibT=tu1；
    3) prepare to start working when chief editor just has begun to launch infrared pulse when from pen, now miss the rising of chief editor Along pulse, it is believed that the pulse is invalid, continues to detect from pen, until detecting complete infrared pulse, so t ∈ (T1,T1+ tu1), then be delayedNib is pressed afterwards to start to launch the infrared pulse of oneself, detects transmitting certainly from pen from the preparation moment Oneself infrared pulse used time
    4) when from pen just chief editor launch infrared pulse trailing edge when preparation, lack the rising edge of infrared pulse, sentence Break as incomplete infrared pulse, it is invalid now to think the pulse, so the pen continues to detect, until detecting completely have The infrared pulse of effect, in t=T1Complete infrared pulse is detected, then is delayedPress nib and send the infrared pulse of oneself, Used time
    5) when preparing to start working in the preceding half period that chief editor works from pen, detected after t complete effective infrared Pulse,It is delayed againPress nib and send the infrared pulse of oneself, so from pen from beginning preparing for work Accomplish and start to launch the infrared pulse of oneself, used time after detecting complete effective infrared pulse
    When two pens have one or two all edge region work, the work period is changed into T2, it is delayed be changed to accordingly
CN201710678439.3A 2017-08-09 2017-08-09 A kind of electronic whiteboard double-pen writing method based on ultrasound Active CN107422883B (en)

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