CN101464755A - Gain time-varying sound wave contact panel system and its control method - Google Patents
Gain time-varying sound wave contact panel system and its control method Download PDFInfo
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- CN101464755A CN101464755A CNA2007101250358A CN200710125035A CN101464755A CN 101464755 A CN101464755 A CN 101464755A CN A2007101250358 A CNA2007101250358 A CN A2007101250358A CN 200710125035 A CN200710125035 A CN 200710125035A CN 101464755 A CN101464755 A CN 101464755A
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Abstract
The invention discloses a system for an acoustic-wave contact plate and a control method thereof, in particular to a system capable of contacting with position coordinates and changing gains in real time, and a method thereof. The system adopts the gain control, thereby being capable of changing the amplification gain of the amplifier in real time during a receiving cycle so as to meet the requirement for the amplification gain by the output signals of a receiving transducer at different times during a receiving cycle, and enable the output signals to be relatively level after the detection is conducted. The invention realizes the approximate level by changing the amplification gain of the amplifier in real time, and has the advantages that the manufacturing cost is low, the realization is simple, the requirement of the mechanical design of the acoustic-wave contact plate is reduced, and the application in a large-scale acoustic-wave contact plate can be conveniently realized.
Description
Affiliated technical field
The present invention discloses a kind of acoustic wave touch panel system and control method thereof, the acoustic wave touch panel system and the control method thereof that become during the particularly a kind of gain that relates to the contact position coordinate.
Background technology
The acoustic wave touch panel device can be applied in a lot of fields, more common application is on computing machine, televisor, game machine and various specialized equipment, inputting interface as a kind of Human-to-Machine, can import information such as similar button, line, figure, literal to machine, in patent No. CN86102275A document, introduced the major technique of existing touch pad.The concrete realization of acoustic wave touch panel device also has a lot of methods, and please referring to accompanying drawing 1, Fig. 1 is wherein a kind of more common acoustic wave touch panel device, generally is installed in the surface of computer screen curtain, can be used as the input of contents such as coordinate, literal, figure.Comprising contact plate 120 and control panel 108, contact plate 120 comprises the substrate 100 of transparent material, X-axis transmitting transducer 104, X-axis receiving transducer 103, Y-axis transmitting transducer 101, Y-axis receiving transducer 102, the X-axis first reflection acoustic grating 110, the X-axis second reflection acoustic grating 112, the Y-axis first reflection acoustic grating 111, the Y-axis second reflection acoustic grating 113.Each reflection acoustic grating all is to be made of many reflector elements 115, and the arrangement of reflector element 115 is necessary for nearly transducer end and dredges, and transducer end far away is close.Control panel 108 comprises receiving circuit, sweep signal generation circuit and microcontroller, and microcontroller is responsible for the gated sweep sequential, is received sequential, coordinates computed and and computing machine communication etc.In patent No. CN86102275A document, narrated, in the detection of each, the path that nearly transducer end sound wave will be walked is short, the path length that transducer end sound wave far away will be walked, and constantly decay in the communication process of sound wave on contact plate causes signal intensity between nearly transducer end and the transducer end far away that the difference of tens of dB is arranged.For the more smooth waveform of being showed just like Fig. 4 A in obtaining after the detection during the receiving cycle 401 of amplitude, the technology that prior art has adopted reflection acoustic grating volume reflection to change, be that nearly transducer end volume reflection is little, transducer end volume reflection far away is big, the attenuation losses that causes because of transmission range with balance.The detection of X-axis and Y-axis generally is that timesharing detects, the same time has only one signal, measure tens of general each p.s., its process is: send sound wave by corresponding transmitting transducer, sound wave is diffused into substrate through the reflection acoustic grating, reflex on the receiving transducer by corresponding reflection acoustic grating again, change out electric signal.The signal that receives is amplified in the transmission of control panel control sound wave, and whether detection is touched and the coordinate of contacting points position.The described device of Fig. 1, control panel wherein, the general receiver amplifier part that Fig. 2 structure is all arranged, the signal 201 of X-axis receiving transducer output is amplified by X-axis prime amplifier 203, the signal 202 of Y-axis receiving transducer output, amplify by Y-axis prime amplifier 204, the time sharing shared main amplifier 205 of the synthetic back input of X, Y two beam warp amplifying signals, signal is amplified into detecting circuit 206 by main amplifier 205, exports the signal 207 after the detection then.In the prior art, the gain amplifier of X-axis prime amplifier 203 and Y-axis prime amplifier 204 is fixed, and main amplifier 205 is variable gain amplifiers, and this is because X-axis is different with the gain amplifier that Y-axis needs.In the prior art, the structure of main amplifier gain control such as Fig. 3, the signal 301 of prime amplifier output is connected to main amplifier 306, amplify back output signal 302, give a digital regulation resistance 304 by a microcontroller 303 output control signals, gain-controlled voltage 305 of digital regulation resistance 304 outputs, this voltage is directly controlled the gain amplifier of main amplifier.The technology that the described reflection acoustic grating of Fig. 1 has all adopted volume reflection to change, interval one end that is specially between the reflector element 115 is wide, and an end is narrow, and wide at interval reflection acoustic grating reflected sound wave is few, and signal energy is little; Narrow at interval reflection acoustic grating reflected sound wave is many, and signal energy is big.The signal 202 intensity opposed flattened of the signal 201 of X-axis receiving transducer output or the output of Y-axis receiving transducer after above-mentioned processing, as Fig. 4 B, the rectified signal that obtains at last such as Fig. 4 A.If the volume reflection of reflection acoustic grating is uniform, promptly path sound wave far away is not compensated, the signal 202 that then receives the signal 201 of X-axis transducer output or the output of X-axis transducer will be as just like shown in Fig. 4 C, signal intensity has the feature of decay in time, major part does not observe after will causing signal demodulator at last, to obtain the signal waveform as Fig. 4 D after the detection, most of signal gets too small that receiving cycle is 401 li can not be used.Current technology, signal after the detection can not be accomplished smooth fully, make up by later stage microcontroller algorithm process, general requirement can reach when not being touched in receiving cycle, and the signal that detection is come out gets final product between less than 2.3 volts greater than 1.2 volts of maximal values in minimum value.It is emphasized that existing receiver amplifier, before each receiving cycle 401, need preestablish gain-controlled voltage 305, do not change during the whole receiving cycle 401.Therefore the gain amplifier of reception amplifier is fixed during the receiving cycle 401, shown in Fig. 4 E.And the outer time of receiving cycle can be adjusted gain amplifier.In the patent No. 02221458.5 document, introduced the technology that cascade increases effective Petting Area, though transmitting transducer and receiving transducer group number have increased, the course of work of each group is still the same.In general, more smooth in order to realize the final detection of the signal signal that comes out, the characteristics of prior art are: reflection acoustic grating volume reflection change technique, and the signal that enters control panel that makes has been more smooth, reception amplifier is fixed at 401 li gain amplifiers of receiving cycle.15 cun acoustic wave touch plates that adopt prior art to make, reflection acoustic grating volume reflection far-end is bigger 9 times than the volume reflection of near-end, but along with the increase of acoustic wave touch board size, above-mentioned ratio must increase, and this is not easy to realize in actual production.
Summary of the invention
Gain amplifier value at the above-mentioned acoustic wave touch panel device of mentioning of the prior art immobilizes, use inconvenient, and be not suitable for making the large scale structural disadvantages, the invention provides a kind of new acoustic wave touch panel system, the signal that its receiving transducer that adopts the gain amplifier of gain control real time altering amplifier in a receiving cycle to satisfy different time in the receiving cycle is exported makes the signal of exporting after the detection reach relatively smooth to the requirement of gain amplifier.
The technical scheme that the present invention solves its technical matters employing is: the control method of the acoustic wave touch panel system that becomes during a kind of the gain, this method is: the prime amplifier that the signal input of receiving transducer output is corresponding with it amplifies, signal input main amplifier after prime amplifier amplifies amplifies, signal after main amplifier amplifies is exported after the detecting circuit detection, if receiving transducer adopts multichannel, the signal of multipath reception transducer output through corresponding with it prime amplifier amplified signal again, timesharing input main amplifier amplifies, or after the timesharing of the signal of multipath reception transducer output elder generation inserts shared prime amplifier and amplifies, signal inputs to main amplifier and amplifies, the variation with the receiving transducer input signal in a receiving cycle of the gain amplifier of gain control circuit controls amplifier changes, and is smooth with the signal after the maintenance detection.
A kind of gain time-varying sound wave contact panel system, acoustic wave touch panel system comprises contact plate and control panel, described contact plate comprises substrate, transmitting transducer, receiving transducer and reflection acoustic grating, be arranged with one or more reflection acoustic grating on the substrate, receiving transducer is installed in reflection acoustic grating one end, and transmitting transducer is installed in an end of reflection acoustic grating; Described control panel is for comprising one or more prime amplifiers, main amplifier, detecting circuit, gain control circuit, microcontroller, sound wave produces circuit, each receiving transducer output signal is connected with its corresponding prime amplifier input end respectively, each prime amplifier output terminal links together and inputs to main amplifier, or after the timesharing of the signal of multipath reception transducer output elder generation inserts shared prime amplifier and amplifies, signal inputs to main amplifier and amplifies, the main amplifier output terminal is connected with the detecting circuit input end, and the gain control circuit output terminal is connected with the Amplifier Gain control end.
The technical scheme that the present invention solves its technical matters employing further comprises:
The variation with the receiving transducer input signal in a receiving cycle of the gain amplifier of described gain control circuit controls main amplifier changes, and is smooth with the signal after the maintenance detection.
Gain amplifier variation with the receiving transducer input signal in a receiving cycle that described sub gain control circuit is not controlled each prime amplifier changes, and is smooth with the signal after the maintenance detection.
Gain amplifier variation with the receiving transducer input signal in a receiving cycle that described gain control circuit is controlled each prime amplifier and main amplifier simultaneously changes, and is smooth with the signal after the maintenance detection.
Described gain control circuit is a microcontroller.
The variation of described microprocessor controls digital to analog converter output voltage, the gain amplifier of control digital to analog converter output voltage control amplifier changes.
Described gain control circuit output terminal is connected with the gain control end of main amplifier.
Described gain control circuit output terminal is connected with the gain control end of each prime amplifier respectively.
Described gain control circuit output terminal is connected with the gain control end of each prime amplifier and main amplifier respectively.
Described reflection acoustic grating transducer end far away is arranged than nearly transducer end and is arranged closely.) (change back you original literary style, problem is little, and other technologies are no one's employing now)
Described gain control circuit is a microcontroller, and the microcontroller data output end is connected with the digital to analog converter input end, and the digital to analog converter output terminal is connected with the amplifier gain control end.
Described digital to analog converter is a functional module in the microcontroller.
The invention has the beneficial effects as follows: the present invention realizes exporting the approximate smooth of rectified signal by the gain amplifier of real time altering amplifier, its cost of manufacture is low, realize simple, but also reduced acoustic wave touch panel device for mechanical designing requirement, also can be applied in easily on the large scale acoustic wave touch panel device.
The present invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a receiving circuit structured flowchart of the present invention.
Fig. 3 is main amplifier and a gain control structured flowchart in the prior art.
The detection output signal synoptic diagram that Fig. 4 A obtains for expectation.
Fig. 4 B is the receiving circuit input signal synoptic diagram of prior art.
Fig. 4 C is the signal schematic representation of the uniform receiving transducer output of reflection acoustic grating volume reflection.
Rectified signal synoptic diagram after the signal that Fig. 4 D exports for the uniform receiving transducer of reflection acoustic grating volume reflection amplifies with existing amplifier.
Fig. 4 E is that the amplifier of prior art changes synoptic diagram at the gain amplifier of receiving cycle.
Fig. 4 F is that amplifier of the present invention changes synoptic diagram at the gain amplifier of receiving cycle.
Fig. 5 is the structured flowchart of a kind of implementation of the present invention.
The structured flowchart of the gain amplifier of the gain control circuit controls main amplifier that becomes when Fig. 6 A is of the present invention.
The structured flowchart of the gain amplifier of the gain control circuit controls prime amplifier that becomes when Fig. 6 B is of the present invention.
The gain control circuit that becomes when Fig. 6 C is of the present invention is controlled the structured flowchart of the gain amplifier of prime amplifier and main amplifier simultaneously.
Embodiment
Present embodiment is the preferred embodiment for the present invention, and other all its principles are identical with present embodiment or approximate with basic structure, all within protection domain of the present invention.
In the present embodiment, with two groups of corresponding transmitting transducers and receiving transducer is that example is carried out specific description to the present invention, be intended to illustrate the principle and the working method of gain control circuit, during concrete enforcement, also can adopt many group transmitting transducers and receiving transducer, the group number that the transmitting transducer that difference is just installed on substrate 100 receives transducing increases, corresponding prime amplifier increases, the signal of multipath reception transducer output is after corresponding with it prime amplifier amplifies, signal timesharing input main amplifier amplifies, or after the timesharing of the signal of multipath reception transducer output elder generation inserted shared prime amplifier and amplify, signal inputed to main amplifier and amplifies.Adopted the time-division processing method the same with two groups to handle many group signals, its fundamental mode is identical with two groups: the signal that receiving transducer comes out, all pass through prime amplifier and main amplifier and amplify.
Please referring to accompanying drawing 1, the physical construction of the acoustic wave touch panel system among the present invention and acoustic wave touch panel physical construction of the prior art are roughly the same, also be as main devices at the substrate 100 that adopts transparent material to make, substrate 100 is designed to rectangle, be equipped with the reflection acoustic grating that reflector element 115 constitutes on 100 4 limits of substrate, wherein be set to the X-axis first reflection acoustic grating 110, the X-axis second reflection acoustic grating 112 on Dui Cheng two limits respectively, be set to the Y-axis first reflection acoustic grating 111, the Y-axis second reflection acoustic grating 113 on two other symmetrical limit respectively.In 100 4 angles of substrate, be respectively arranged with X-axis transmitting transducer 104 and Y-axis transmitting transducer 101 on two angles of symmetry, be provided with X-axis receiving transducer 103 and Y-axis receiving transducer 102 simultaneously on the angle in all the other two remaining angles.Acoustic wave energy is launched in X-axis transmitting transducer 104 and 101 timesharing of Y-axis transmitting transducer, is received by X-axis receiving transducer 103 and Y-axis receiving transducer 102 after reflector element 115 reflections, and is transferred to controller 108.Among the present invention, reflector element 115 can on average be arranged on substrate 100, and promptly the spacing of reflector element 115 is identical.Please referring to accompanying drawing 5, accompanying drawing 5 is middle controller 108 main part circuit structure block diagrams of the present invention, the signal 501 of receiving transducer output is connected to and receives amplification circuits 503, after amplifying, amplification circuits 503 outputs to detecting circuit 506 through receiving, output signal 502 after detecting circuit 506 detections, the time gain control circuit 505 outputing gain control signals 506 that become, control receives the gain amplifier of amplification circuits 503.Because acoustic signals is propagated decay in time on substrate 100, in general glass material, the rate of decay probably is 1dB/CM, attenuation characteristic is linear substantially, its cutoff characteristic is please referring to shown in the accompanying drawing 4C, be example now with 15 cun screen, X-axis for 15 cun screens, adopt nearly transducer end of reflection acoustic grating volume reflection uniform Design and transducer end far away that the difference in signal strength of 60dB will be arranged, be the signal 501 of 401 li receiving transducers of receiving cycle output among Fig. 4 C, the difference of signal minimax is about 60dB, make detection after signal more smooth, as Fig. 4 A, must be in 401 li recruitments that make amplifier gain that 60dB be arranged of a receiving cycle, gain increases signal 501 couplings of wanting and receiving transducer output, promptly presents linearity substantially, then the gain amplifier change curve is shown in Fig. 4 F, and the variable quantity of gain is 60dB.This recruitment of the size of different size is different, is the less of the big amplification of signal in simple terms, the amplification that signal is little some more, thus signal is more smooth after obtaining detection, as Fig. 4 A.
For the system that a plurality of receiving transducers are arranged, can adopt time-sharing operation to handle input signal, promptly the same time has only one signal, generally measures each p.s. tens of times.
Among the present invention, when specifically implementing, the time gain control circuit pair amplifier that becomes gain amplifier control can be divided into following three kinds multi-form:
First kind, the time gain control circuit that becomes can only control the gain amplifier of main amplifier, realize the change in gain of whole reception amplifier.Particular circuit configurations is please referring to accompanying drawing 6A, X-axis receiving transducer input signal 601 and Y-axis receiving transducer input signal 602, output to main amplifier 605 after amplifying through separately X-axis prime amplifier 603 and Y-axis prime amplifier 604 respectively, output to the signal 608 after the wave detector 606 output detections then, the time gain control circuit 607 outputs that become the gain of control signal control main amplifier 605.
Second kind, the time gain control circuit that becomes can only control the gain of prime amplifier, realize the change in gain of whole reception amplifier.Particular circuit configurations is please referring to accompanying drawing 6B, X-axis receiving transducer input signal 601 and Y-axis receiving transducer input signal 602, respectively through outputing to main amplifier 605 after X-axis prime amplifier 603 and 604 amplifications of Y-axis prime amplifier, output to the signal 607 after the wave detector 606 output detections then, the time gain control circuit 608 outputs that become control signal control the gain of X-axis prime amplifier 603 and Y-axis prime amplifier 604 respectively.
The third, the time gain control circuit that becomes can also control the gain of main amplifier and prime amplifier simultaneously, realize the change in gain of whole reception amplifier.Particular circuit configurations is please referring to accompanying drawing 6C, X-axis receiving transducer input signal 601 and Y-axis receiving transducer input signal 602, respectively through outputing to main amplifier 605 after X-axis prime amplifier 603 and 604 amplifications of Y-axis prime amplifier, output to the signal 607 after the wave detector 606 output detections then, the time gain control circuit 608 outputs that become control signal control the gain of X-axis prime amplifier 603, Y-axis prime amplifier 604 and main amplifier 605 respectively.
Among the present invention, the time gain control circuit that becomes can realize by the microcontroller on the control panel and some peripheral components, also can realize by other discrete components.The time gain control circuit that becomes when adopting microcontroller to realize, can be by microprocessor controls DAC (digital to analog converter), control the output voltage of DAC by microcontroller by program, make voltage make corresponding variation in time, thus the gain size of ride gain control circuit.The time gain control circuit that becomes when realizing by discrete component, if the variation of the control signal that is produced makes Amplifier Gain change in the time of can not mating mutually with the signal of transducer output, just merely by the time gain control circuit controls Amplifier Gain that becomes change can not satisfy the rectified signal that makes output and reach the smooth effect of phase pairing approximation of expection the time, can correct by the volume reflection changing pattern of revising the reflection acoustic grating, promptly be to change volume reflection by changing the density of arranging of reflector element 115 on substrate 100.
The present invention can also and prior art in change the reflection acoustic grating and arrange technology that density changes volume reflection in conjunction with application, reflect smaller that the volume reflection ratio of acoustic grating can design like this, and the change in gain amount is also smaller.The two combination makes and all realizes than being easier on Machine Design still is electrical design.
The present invention is when work, after each transmission detects sound wave, receiving circuit begins to receive during the sound wave that returns, just during receiving cycle 401, the gain of constantly adjusting reception amplifier changes in time, and promptly in the time period that receives, the gain of control amplifier is changed from small to big in time, make the signal amplitude after the amplification relatively smooth, and do not require that the signal intensity of receiving transducer output is straight.Thereby, can realize the design of large scale acoustic wave touch panel.
The inputting interface that the present invention can be used as a kind of Human-to-Machine is widely used on computing machine, televisor, game machine and the various specialized equipment, can import information such as similar button, line, figure, literal to machine.
Claims (13)
1, the control method of the acoustic wave touch panel system that becomes during a kind of the gain, it is characterized in that: described this method is: the prime amplifier that the signal input of receiving transducer output is corresponding with it amplifies, signal input main amplifier after prime amplifier amplifies amplifies, signal after main amplifier amplifies is exported after the detecting circuit detection, if receiving transducer adopts multichannel, the signal of multipath reception transducer output through corresponding with it prime amplifier amplified signal again timesharing input main amplifier amplify, or after the timesharing of the signal of multipath reception transducer output elder generation inserts shared prime amplifier and amplifies, signal inputs to main amplifier and amplifies, the variation with the receiving transducer input signal in a receiving cycle of the gain amplifier of gain control circuit controls amplifier changes, and is smooth with the signal after the maintenance detection.
The control method of the acoustic wave touch panel system that becomes when 2, requiring 1 described gain according to claim, it is characterized in that: the variation with the receiving transducer input signal in a receiving cycle of the gain amplifier of described gain control circuit controls main amplifier changes, and is smooth with the signal after the maintenance detection.
The control method of the acoustic wave touch panel system that becomes when 3, requiring 1 described gain according to claim, it is characterized in that: gain amplifier variation with the receiving transducer input signal in a receiving cycle that described sub gain control circuit is not controlled each prime amplifier changes, and is smooth with the signal after the maintenance detection.
The control method of the acoustic wave touch panel system that becomes when 4, requiring 1 described gain according to claim, it is characterized in that: gain amplifier variation with the receiving transducer input signal in a receiving cycle that described gain control circuit is controlled each prime amplifier and main amplifier simultaneously changes, and is smooth with the signal after the maintenance detection.
5, according to the control method of the acoustic wave touch panel system that any described when gain becomes in the claim 1 to 4, it is characterized in that: described gain control circuit is a microcontroller.
6, when gain according to claim 5 the acoustic wave touch panel system that becomes control method, it is characterized in that: the variation of described microprocessor controls digital to analog converter output voltage, the gain amplifier of control digital to analog converter output voltage control amplifier changes.
The gain time-varying sound wave contact panel system of the control method of the acoustic wave touch panel system that becomes when 7, realizing as claimed in claim 1 the gain, it is characterized in that: described acoustic wave touch panel system comprises contact plate and control panel, described contact plate comprises substrate, transmitting transducer, receiving transducer and reflection acoustic grating, be arranged with one or more reflection acoustic grating on the substrate, receiving transducer is installed in reflection acoustic grating one end, and transmitting transducer is installed in an end of reflection acoustic grating; Described control panel is for comprising each prime amplifier, main amplifier, detecting circuit, gain control circuit, microcontroller, sound wave produces circuit, each receiving transducer output signal is connected with its corresponding prime amplifier input end respectively, each prime amplifier output terminal links together and inputs to main amplifier, or after the timesharing of the signal of multipath reception transducer output elder generation inserts shared prime amplifier and amplifies, signal inputs to main amplifier and amplifies, the main amplifier output terminal is connected with the detecting circuit input end, and the gain control circuit output terminal is connected with the Amplifier Gain control end.
8, gain time-varying sound wave contact panel system according to claim 7 is characterized in that: described gain control circuit output terminal is connected with the gain control end of main amplifier.
9, gain time-varying sound wave contact panel system according to claim 7 is characterized in that: described gain control circuit output terminal is connected with the gain control end of each prime amplifier respectively.
10, gain time-varying sound wave contact panel system according to claim 7 is characterized in that: described gain control circuit output terminal is connected with the gain control end of each prime amplifier and main amplifier respectively.
11, according to any described gain time-varying sound wave contact panel system in the claim 7 to 10, it is characterized in that: described reflection acoustic grating transducer end far away is arranged closely than nearly transducer end.(about none formulation is more more specifically arranged herein, so saying is a technique effect, rather than technical scheme, probably the auditor can not accept, can provide the saying of a recapitulative technical scheme? saying generality is not enough closely such as arranging, but it is a concrete technical scheme, should be a kind of technique effect that can reach and change present saying into, such saying is unallowed in accordance with regulations on patent, and patent is only accepted the saying of technical scheme)
12, according to any described gain time-varying sound wave contact panel system in the claim 7 to 10, it is characterized in that: described gain control circuit is a microcontroller, the microcontroller data output end is connected with the digital to analog converter input end, and the digital to analog converter output terminal is connected with the amplifier gain control end.
13, gain time-varying sound wave contact panel system according to claim 12 is characterized in that: described digital to analog converter is a functional module in the microcontroller.
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| CNA2007101250358A CN101464755A (en) | 2007-12-17 | 2007-12-17 | Gain time-varying sound wave contact panel system and its control method |
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| CNA2007101250358A CN101464755A (en) | 2007-12-17 | 2007-12-17 | Gain time-varying sound wave contact panel system and its control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339477B (en) * | 2008-05-07 | 2012-04-18 | 骆航 | Acoustic wave contact plate system and its multitime scanning control method |
| CN107219964A (en) * | 2017-06-30 | 2017-09-29 | 成都吉锐时代触摸技术有限公司 | A kind of signal gain adjusting method of acoustic wave touching screen |
-
2007
- 2007-12-17 CN CNA2007101250358A patent/CN101464755A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339477B (en) * | 2008-05-07 | 2012-04-18 | 骆航 | Acoustic wave contact plate system and its multitime scanning control method |
| CN107219964A (en) * | 2017-06-30 | 2017-09-29 | 成都吉锐时代触摸技术有限公司 | A kind of signal gain adjusting method of acoustic wave touching screen |
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Application publication date: 20090624 |