CN103472933B - Portable hand input device and method based on microphones - Google Patents
Portable hand input device and method based on microphones Download PDFInfo
- Publication number
- CN103472933B CN103472933B CN201310404511.5A CN201310404511A CN103472933B CN 103472933 B CN103472933 B CN 103472933B CN 201310404511 A CN201310404511 A CN 201310404511A CN 103472933 B CN103472933 B CN 103472933B
- Authority
- CN
- China
- Prior art keywords
- peak
- ultrasound
- ultrasonic
- memory space
- wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008859 change Effects 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000002604 ultrasonography Methods 0.000 claims description 61
- 241001269238 Data Species 0.000 claims description 6
- 230000006870 function Effects 0.000 claims description 6
- 230000001629 suppression Effects 0.000 claims description 5
- 238000013500 data storage Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims 1
- 230000003993 interaction Effects 0.000 abstract description 3
- 230000003139 buffering effect Effects 0.000 abstract 1
- 230000005236 sound signal Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 208000031339 Split cord malformation Diseases 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004645 scanning capacitance microscopy Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000013068 supply chain management Methods 0.000 description 3
- 101100236764 Caenorhabditis elegans mcu-1 gene Proteins 0.000 description 2
- 102100026436 Regulator of MON1-CCZ1 complex Human genes 0.000 description 2
- 101710180672 Regulator of MON1-CCZ1 complex Proteins 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000005055 memory storage Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 210000004247 hand Anatomy 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
A portable hand input device and method based on microphones is applicable to the fields of man-machine interaction, character input, multimedia education and the like. The three microphones are used for receiving ultrasonic signals emitted by a hand writing pen, a single cycle sine wave cross-correlation filtering algorithm is adopted to restrain sound signal interference lower than 20 KHz, in an ultrasonic signal buffering area subjected to relevant filter processing, a peak value change maximum value is used as an ultrasonic wave arriving judging criterion, ultrasonic transit time is calculated through a straight line fitting method, locating of an electronic pen is achieved, and the portable hand input device is used for man-machine interaction, educational informationization and character input.
Description
Technical field
The present invention relates to a kind of portable handwriting input device based on mike and method are and in particular to one kind adopts wheat
Gram wind receives ultrasonic signal, realizes portable handwriting input device and the method for writing pencil positioning using ultrasonic wave location technology.
Background technology
Existing hand input device generally requires special circuit, special material or ad hoc structure, such as handwriting pad, touch screen
Deng, relatively large sized it has not been convenient to carry.Traditional handwriting input equipment mainly adopts electromagnetic induction, infrared scan, pressure sensitivity, number
The technology such as word vision, ultrasonic locating, based on the hand input device of the technology such as electromagnetic induction, infrared scan, pressure sensitivity, need solid
Surely there is special circuit, special material or ad hoc structure it is difficult to apply in portable handwriting input device.Based on digital-visual
Image scanning techniques, algorithm is complicated, positioning precision is low, affected by environment big, using inconvenience.Chinese patent is " portable hand-written
Input equipment " (application number 200910301802.5) discloses a kind of portable handwriting input device, absorbs handss using photographic head
Write person's handwriting, send computer to, realize the input of handwriting, this device simply will absorb person's handwriting in the way of picture it is impossible to list
Solely extract person's handwriting, be unfavorable for preserving and transmit.Ultrasonic locating belongs to wireless location technology, transmitting ultrasound wave letter on writing pencil
Number, receptor utilizes multiple reception sensor received ultrasonic signals, obtains writing pencil according to the ultrasonic signal receiving
Coordinate, realizes the positioning to writing pencil as followed the tracks of.It is excellent that ultrasonic wave location technology has noncontact, positioning precision is high, scope is big etc.
Point, without special circuit and certain material, is the optimization technique of portable handwriting input device.
Content of the invention
Based on this, the present invention adopts ultrasonic wave location technology, discloses a kind of portable handwriting input dress based on mike
Put, using 3 mike received ultrasonic signals, by a/d transducer gathered data and store, mutual using monocycle sine wave
The acoustical signal interference less than 20khz for the correlation filtering suppression, the ultrasonic signal relief area after processing through correlation filtering
Interior, search obtains the peak point of ultrasonic signal, calculates adjacent periods peak change value, with peak change maximum as ultrasound wave
Reach basis for estimation, obtain the delay inequality of relatively reference microphone, realize the positioning to electronic pen and tracking, be man-machine interaction,
IT application in education sector, word input provide a kind of portable handwriting input device and method.
The present invention provides the portable handwriting input device based on mike, including lettering pen and receptor two parts.
(1) receptor
Including three ultrasound wave receiving channels, power supply, microprocessor, memorizer and temperature sensor.Each ultrasound wave
Receiving channel all includes mike, amplifying circuit, gain adjustment circuit, a/d transducer.
Mike adopts electret condenser microphone or silicon microphone, for received ultrasonic signal.
Amplifying circuit adopts single supply low noise operational amplifier, the signal of mike output is amplified and filters.
Gain adjustment circuit according to receipt signal amplitude size, by the tune to amplifying circuit gain for the microprocessor control realization
Whole it is ensured that in whole working range, input to the amplitude of ultrasonic change of a/d transducer less.
A/d transducer to input ultrasonic signal carry out analog digital conversion, using single a/d conversion chip it is also possible to
The a/d transducer being carried using microprocessor internal.
Microprocessor adopts dsp, arm, fpga or High Performance SCM.
Power supply can be powered using battery or 220v Alternating Current Power Supply, need produce 5v power and microprocessor needed for power supply electricity
Pressure, such as 3.3v, 1.8v etc..
The ultrasonic signal of memory storage collection, capacity according to discharger and receives the distance with processing meanss and setting
Sample rate determine.
Temperature sensor adopts digital or analog temperature sensor, for measuring operating ambient temperature, receptor root
Calculate ultrasonic propagation velocity according to system temperature, it is to avoid the impact to positioning precision for the temperature change.
(2) writing pencil
Including ultrasound-driven circuit, ultrasound emission sensor, processor 1 (mcu 1), power supply and button.
Ultrasonic drive circuit adopts pulse transformer to drive, and ultrasonic pulse width is the half in ultrasonic signal cycle, surpasses
Acoustic emission sensor is capacitance type transducers, constitutes shunt-resonant circuit it is desirable to the inductance of transformer secondary output with transformer secondary output
Meet condition of resonance with the electric capacity of sonac.
Ultrasonic emitting sensor adopts pvdf (pvdf:polyvinylidene difluoride, Kynoar) to press
Conductive film sensor, is designed to cylindrical shape, can 360 degree of horizontal emission it is ensured that writing pencil horizontal omnidirectional transmitting ultrasonic signal.
Processor 1 mainly produces ultrasonic pulse signal and timing signal, using low pin, low performance single-chip microcomputer.
Power supply provides power supply for writing pencil, using single-unit aa battery or aaa battery, rechargeable battery may also be employed, with boosting
Circuit produces 5v DC source and powers to other circuit.
Button includes key, lower key and nib button, upper key and lower key analog mouse right and left key respectively, and nib key is used for opening
Dynamic writing function.The differentiation of keypress function is distinguished by the cycle difference of launched ultrasound wave.
The present invention provides a kind of portable stylus localization method, comprising:
(1) microprocessor controls a/d transducer continuous acquisition ultrasound data, sets ultrasound data memory space, will
Described ultrasound data is stored in described ultrasound data memory space；
(2) do monocycle related operation (phase using the monocycle sinusoidal wave data of storage with ultrasound data memory space
Close filtering), the interference of suppression below 20khz voice signal；
(3) search in the ultrasound data memory space in step (1), obtain the maximum of ultrasonic signal,
10 cycles and the peak point finding each ultrasonic period of wave below in 10 ultrasonic periods of wave before big value, and set peak value
Point memory space store the numerical value of each peak point and its in the address of ultrasound data memory space；
(4) calculate peak amplitude changing value before and after each ultrasonic period of wave in the peak point memory space in step (3),
And set peak change value memory space, store each ultrasound wave cycle peak changing value with it in ultrasound data memory space
Address；
(5) in the peak change value memory space in step (4), search obtains peak-peak changing value；
(6) direction increasing to storage address from the ultrasound data storage location of peak-peak changing value is searched in order
Rope, obtains first zero crossing, and former and later two ultrasound datas closest to described first zero crossing；
(7) by step 6 obtain described in the numerical value of former and later two ultrasound datas and storage address line fitting method
It is calculated ultrasound wave and reach precise moments；
(8) reach the due in of three mikes according to the ultrasound wave of writing pencil transmitting, set one of them as reference
Mike, the ultrasonic signal calculating writing pencil transmitting reaches two other mike and reaches the time of reference microphone
Difference, using tdoa method, realizes the positioning of lettering pen.
It is an advantage of the current invention that: using mike received ultrasonic signal, receiving angle is big, low cost, signal bandwidth
Wide；Reduce amount of calculation using monocycle correlation filtering, basis for estimation extraction is reached for ultrasound wave with peak change maximum ultrasonic
Ripple reach the moment, positioning precision is high.
Brief description
Fig. 1 is receptor schematic diagram
Fig. 2 is acceptor circuit theory diagram
Fig. 3 is writing pen structure schematic diagram
Fig. 4 is writing pencil schematic block circuit diagram
Fig. 5 is ultrasound wave receipt signal waveform
Fig. 6 is monocycle sinusoidal wave form
Fig. 7 is signal contrast before and after cross correlation filter
Fig. 8 is ultrasound wave due in detection waveform figure
Fig. 9 calculates schematic diagram for due in
Figure 10 positions schematic diagram for writing pencil
Specific embodiment
The invention provides a kind of be based on mike portable handwriting input device, mainly include writing pencil and receptor two
Part.
(1) receptor
Acceptor device equidistantly installs 3 mikes, and between two neighboring mike, distance is d, as shown in Figure 1.
Mike adopts electret condenser microphone or silicon microphone it is contemplated that the portability of acceptor device, select small size or
The mike of person's paster encapsulation.
Receptor internal circuit includes three ultrasound wave receiving channels, power supply 2, microprocessor 2, memorizer and temperature and passes
Sensor.Each ultrasound wave receiving channel all includes mike, ultrasonic amplifying circuit, gain adjustment circuit, a/d transducer, such as Fig. 2
Shown.
In Fig. 2, mic1, mic2, mic3 are mike, using electret condenser microphone or silicon microphone, are used for connecing
Receive ultrasonic signal.
In Fig. 2, ultrasonic amplifying circuit 1, ultrasonic amplifying circuit 2 and ultrasonic amplifying circuit 3 amplify respectively mic1, mic2 and
The ultrasonic signal that tri- mikes of mic3 receive, possesses amplification and filter action, is amplified using single supply low noise operational
Device.
In Fig. 2, gain control circuit 1, gain adjustment circuit 2 and gain adjustment circuit 3 are respectively used to adjust ultrasonic amplification
The gain of circuit 1, ultrasonic amplifying circuit 2 and ultrasonic amplifying circuit 3, microprocessor 2 according to each channel receiving signal amplitude size,
Produce the gain control signal of each channel ultrasound amplifying circuit it is ensured that in whole working range, inputing to the super of a/d transducer
Wave amplitude change is less.
In Fig. 2, ad1, ad2 and ad3 are respectively the a/d change-over circuit of three passages, and the ultrasonic signal of input is carried out
Analog digital conversion, can adopt single a/d conversion chip, it would however also be possible to employ the a/d transducer that microprocessor internal carries, according to being
The required precision of system carries out the digit of a/d transducer and sample rate selects.
Microprocessor 2 adopts dsp, arm, fpga or other High Performance SCMs, due to computings such as correlation filterings to be completed,
Relatively higher to the execution rate request of the instruction of processor, therefore select computing capability relatively strong dsp, arm, fpga
Or other High Performance SCMs.
Power supply 2 can be powered using battery or 220v Alternating Current Power Supply, provides needed for 5v voltage and microprocessor for receptor
Supply voltage, such as 3.3v, 1.8v etc..
The ultrasonic signal of memory storage collection, capacity according to discharger and receives the distance with processing meanss and setting
Sample rate determine.
Temperature sensor adopts digital or analog temperature sensor, for measuring operating ambient temperature, receptor root
Calculate ultrasonic propagation velocity according to system temperature, it is to avoid the impact to positioning precision for the temperature change.
(2) writing pencil
Fig. 3 is writing pencil schematic appearance, mainly includes housing, button, nib, ultrasonic transmitter, internal circuit etc..
Ultrasonic transmitter adopt pvdf piezoelectric film sensor, be designed to cylindrical shape, can 360 degree horizontal emission, guarantor
Card writing pencil horizontal direction theaomni-directional transmission ultrasonic signal.
Internal circuit includes ultrasound-driven circuit, ultrasound emission sensor, microprocessor 1 (mcu 1), power supply and button.
Ultrasound-driven circuit adopts pulse transformer to drive, and ultrasonic pulse width is the half in ultrasonic signal cycle, ultrasonic
Emitter be capacitance type transducers, with transformer secondary output constitute shunt-resonant circuit it is desirable to transformer secondary output inductance with ultrasonic
The electric capacity of sensor meets condition of resonance.
Microprocessor 1 mainly produces ultrasonic pulsative signal and timing signal, using low pin, low performance single-chip microcomputer.
Power supply provides power supply for writing pencil, using single-unit aa battery or aaa battery, rechargeable battery may also be employed, with boosting
Circuit produces 5v DC source and powers to other circuit.
Button includes key, lower key and nib button, upper key and lower key analog mouse right and left key respectively, and nib key is used for opening
Dynamic writing function.The differentiation of keypress function is distinguished by the cycle difference of launched ultrasound wave.
The invention provides a kind of writing pencil method for ultrasonic locating, specific embodiment is as follows:
(1) microprocessor 2 continuous acquisition writing pencil transmitting ultrasonic signal and store, memory space be buf, mike
The ultrasound wave typical waveform receiving is as shown in Figure 5.
(2) related operation (correlation filtering) in short-term, monocycle are done using monocycle sine wave with the ultrasound data in buf
The waveform of sine wave as shown in fig. 6, correlation result still leaves in buf, signal waveform such as Fig. 7 institute before and after related operation
Show.
(3) search in buf, find the peak point of each ultrasonic period of wave, as shown in figure 8, using " ° " to represent in fig. 8,
And open up memory space bpeakStore the numerical value of each peak point and its in the address of buf memory space.Execute this step operation
When it is contemplated that the presence of noise, want peaking to be more than a certain level when searching in buf, it is to avoid noise jamming, raising algorithm
Stability；
(4) in bpeakInterior search, calculates peak amplitude changing value before and after ultrasonic signal, uses " * " to represent in fig. 8, and
Open up memory space bvalpStore each peak change value with it in the address of buf memory space；
(5) in bvalpInterior search, obtains maximum, the as peak change value of maximum, is designated as vmvalp, its address is
vmvalpadr；
(6) in buf memory space, from vmvalpadrSearch obtains first former and later two sampled point of zero crossing backward, uses
p1、p2Represent, preserve numerical value and the storage address of two sampled points, be designated as v respectively1、v2And ad1、ad2, wherein ad2=ad1+1.
Represent p with the time1(t1, v1), p2(t1+ ts, v2), wherein t1=ad1Ts, v1＞ 0, v2＜ 0, as shown in Figure 9；
(7) p is passed through in definition1, p22 points of straight line and the intersection point p of time shafts0For ultrasound wave due in, it is designated as tcom.Profit
Use p1, p22 points of sampled value and storage address, can be obtained using line fitting method
By t1=ad1Ts brings above formula into and obtains
" " is used to represent t in fig. 8com.Detect arriving of three road ultrasonic signals using above-mentioned steps (1)～(7) respectively
Reach moment tcom1, tcom2And tcom3.
(8) Figure 10 positions schematic diagram, in figure b for lettering pen1(0,0), b2(d, 0), b3(2d, 0) is respectively 3 mikes
Coordinate, the coordinate of p (x, y) lettering pen.With mike b1(0,0) it is reference mode, velocity of sound vuRepresent, m, n are to have symbol
Number, represents range difference, m=vu*(tcom2-tcom1), n=vu*(tcom3-tcom1).The positioning of writing pencil is described below in conjunction with Figure 10
Method.
If lettering pen p and mike b1The distance between be l, p and mike b1、b2、b3The distance between can be written as:
x2+y2=l2(1)
(x-d)2+y2=(l-m)2(2)
(x-2d)2+y2=(l-n)2(3)
(1) formula deducts (2) formula and obtains:
2xd-d2=2lm-m2(4)
(1) formula deducts (3) formula and obtains:
4xd-4d2=2ln-n2(5)
L is tried to achieve by (4) formula, (5) formula
X just can be tried to achieve by formula (6) and formula (4)
Y can be tried to achieve by formula (7) and formula (1)
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Any modification, equivalent and improvement of being made within principle etc., should be included within the scope of the present invention.
Claims (5)
1. a kind of portable handwriting input device based on mike is it is characterised in that include:
Writing pencil and receptor；
Described writing pencil includes ultrasound-driven circuit, ultrasound emission sensor, microprocessor 1, power supply and button；
Described button includes key, lower key and nib key, upper key and lower key analog mouse right and left key respectively, and nib key is used for starting
Writing function, keypress function is distinguished by the cycle difference of launched ultrasound wave；
Described receptor includes three ultrasound wave receiving channels, power supply, microprocessor 2, memorizer and temperature sensor；Each
Ultrasound wave receiving channel all includes mike, amplifying circuit, gain adjustment circuit, a/d transducer；
Described microprocessor 2 produces gain control signal according to the ultrasonic signal amplitude size that each passage is received, automatically
Adjust the gain of each passage；
The ultrasonic signal real-time sampling to each passage for the described microprocessor 2, and store, using monocycle correlation filtering
The noise jamming of suppression below 20khz voice signal；
Described microprocessor 2 searches for, in the ultrasound data memory space of each passage, the maximum obtaining ultrasonic signal,
Find the peak point of each ultrasonic period of wave in first 10 of maximum and rear 10 ultrasonic periods of wave, set peak point storage empty
Between, peak point memory space store the numerical value of each peak point and its in the address of ultrasound data memory space；Microprocessor 2
Calculate peak amplitude changing value before and after each ultrasonic period of wave in peak point memory space, and it is empty to set the storage of peak change value
Between, store each ultrasound wave cycle peak changing value with it in the address of ultrasound data memory space；Deposit in peak change value
Search in storage space obtains peak-peak changing value；From the ultrasound data storage location of peak-peak changing value in order backward
Search, obtains first zero crossing, and former and later two ultrasound datas closest to described first zero crossing；By obtain
The numerical value of described two ultrasound datas and storage address line fitting method are calculated ultrasound wave and reach precise moments；
Described microprocessor 2 reaches the due in of three mikes according to the ultrasonic signal that writing pencil is launched, and sets wherein
One is reference microphone, and the ultrasonic signal calculating writing pencil transmitting reaches two other mike and reaches with reference to Mike
The time difference of wind, realizes the positioning of lettering pen.
2. a kind of method for ultrasonic locating based on mike is it is characterised in that include:
(1) microprocessor controls a/d transducer continuous acquisition ultrasound data, sets ultrasound data memory space, will be described
Ultrasound data is stored in described ultrasound data memory space；
(2) do monocycle related operation using the monocycle sinusoidal wave data of storage with ultrasound data memory space to be filtered
Ripple, the interference of suppression below 20khz voice signal；
(3) search in the ultrasound data memory space in step (1), obtain the maximum of ultrasonic signal, in maximum
Before and after find the peak point of each ultrasonic period of wave in 10 ultrasonic periods of wave, and set peak point memory space and store each
The numerical value of peak point is with it in the address of ultrasound data memory space；
(4) calculate peak amplitude changing value before and after each ultrasonic period of wave in the peak point memory space in step (3), and set
Determine peak change value memory space, store each ultrasound wave cycle peak changing value with it on the ground of ultrasound data memory space
Location；
(5) in the peak change value memory space in step (4), search obtains peak-peak changing value；
(6) search for backward in order from the ultrasound data storage location of peak-peak changing value, obtain first zero crossing, with
And former and later two ultrasound datas closest to described first zero crossing；
(7) numerical value of the described two ultrasound datas obtaining and storage address line fitting method are calculated ultrasound wave
Reach precise moments；
(8) reach the due in of three mikes according to the ultrasound wave of writing pencil transmitting, set one of them as with reference to Mike
Wind, the ultrasonic signal calculating writing pencil transmitting reaches two other mike and reaches the time difference of reference microphone, real
The positioning of existing lettering pen.
3. method as claimed in claim 2 it is characterised in that: using monocycle sine wave correlation filtering suppression voice letter
Number interference.
4. method as claimed in claim 2 it is characterised in that: be super with adjacent periods ultrasonic signal peak change maximum
The basis for estimation of sound wave due in.
5. method as claimed in claim 2 it is characterised in that: described ultrasonic signal frequency be more than 20khz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310404511.5A CN103472933B (en) | 2013-09-09 | 2013-09-09 | Portable hand input device and method based on microphones |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310404511.5A CN103472933B (en) | 2013-09-09 | 2013-09-09 | Portable hand input device and method based on microphones |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103472933A CN103472933A (en) | 2013-12-25 |
| CN103472933B true CN103472933B (en) | 2017-02-01 |
Family
ID=49797816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310404511.5A Expired - Fee Related CN103472933B (en) | 2013-09-09 | 2013-09-09 | Portable hand input device and method based on microphones |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103472933B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106778720B (en) * | 2016-11-23 | 2020-05-22 | 武汉工程大学 | System and method for digitally recording and electronically reconstructing handwriting process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1740958A (en) * | 2005-06-14 | 2006-03-01 | 袁芳革 | Ultrasonic positioning control device and method thereof |
| CN101853111A (en) * | 2010-05-21 | 2010-10-06 | 福州锐达数码科技有限公司 | Ultrasonic interactive electronic white board system |
| CN201698393U (en) * | 2010-06-02 | 2011-01-05 | 卢永雄 | Integrated electronic white board and electronic pen thereof |
| CN102636252A (en) * | 2012-04-10 | 2012-08-15 | 吉林大学 | Method and device for detecting precise arrival moment of ultrasonic wave |
| CN102929451A (en) * | 2011-08-10 | 2013-02-13 | 李幸超 | Intelligent whiteboard system using ultrasonic touch screen |
-
2013
- 2013-09-09 CN CN201310404511.5A patent/CN103472933B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1740958A (en) * | 2005-06-14 | 2006-03-01 | 袁芳革 | Ultrasonic positioning control device and method thereof |
| CN101853111A (en) * | 2010-05-21 | 2010-10-06 | 福州锐达数码科技有限公司 | Ultrasonic interactive electronic white board system |
| CN201698393U (en) * | 2010-06-02 | 2011-01-05 | 卢永雄 | Integrated electronic white board and electronic pen thereof |
| CN102929451A (en) * | 2011-08-10 | 2013-02-13 | 李幸超 | Intelligent whiteboard system using ultrasonic touch screen |
| CN102636252A (en) * | 2012-04-10 | 2012-08-15 | 吉林大学 | Method and device for detecting precise arrival moment of ultrasonic wave |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103472933A (en) | 2013-12-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4154342B2 (en) | Wireless powerless handwriting device for computer input | |
| CN101642405B (en) | Ultrasonic blind guide method and portable ultrasonic blind guide device thereof | |
| CN106598293B (en) | A kind of three-dimensional large space multichannel pen type interactive system | |
| EP3923273B1 (en) | Voice recognition method and device, storage medium, and air conditioner | |
| Chen et al. | Your table can be an input panel: Acoustic-based device-free interaction recognition | |
| CN106772246B (en) | Unmanned plane real-time detection and positioning system and method based on acoustic array | |
| CN103455171B (en) | A kind of three-dimensional interactive electronic whiteboard system and method | |
| Liu et al. | Vibsense: Sensing touches on ubiquitous surfaces through vibration | |
| CN105866742A (en) | Shell explosion point positioning system and positioning method | |
| CN102741919A (en) | Method and apparatus for providing user interface using acoustic signal, and device including user interface | |
| CN103948398B (en) | Be applicable to the heart sound location segmentation method of android system | |
| CN105044676A (en) | Energy-based sound source localization method | |
| CN105828266A (en) | Signal processing method and system for microphone array | |
| CN203851275U (en) | Automatic-adjusting pickup equipment based on face identification | |
| CN104076364A (en) | Automobile obstacle detection system based on ultrasonic positioning technology | |
| CN203811806U (en) | A life detection instrument based on an ultra wide band pulse radar | |
| CN103472933B (en) | Portable hand input device and method based on microphones | |
| CN105898649B (en) | A kind of sound collector suitable under remote high-noise environment | |
| CN106339081A (en) | Commercial equipment-based equipment carrying-free palm-positioning human-computer interaction method | |
| CN103344703A (en) | Method for detecting type of medium material of part for receiving terminal equipment | |
| Luo et al. | SoundWrite II: Ambient acoustic sensing for noise tolerant device-free gesture recognition | |
| CN206209105U (en) | A kind of high-precision ultrasonic ranging device | |
| CN201417510Y (en) | Touch reading machine | |
| CN205157771U (en) | Sound orientation device | |
| CN208520985U (en) | A kind of sonic location system based on multi-microphone array |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170201 |