CN103995624A - Signal-interference-resisting method and device - Google Patents

Signal-interference-resisting method and device Download PDF

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Publication number
CN103995624A
CN103995624A CN201410224826.6A CN201410224826A CN103995624A CN 103995624 A CN103995624 A CN 103995624A CN 201410224826 A CN201410224826 A CN 201410224826A CN 103995624 A CN103995624 A CN 103995624A
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signal
receiving unit
signal receiving
environmental interference
sampling number
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CN201410224826.6A
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CN103995624B (en
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薛晓光
王武军
赵书凯
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Hisense Visual Technology Co Ltd
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Qingdao Hisense Electronics Co Ltd
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Abstract

The invention discloses a signal-interference-resisting method and device and relates to the field of touch screens. The accuracy of response of a touch screen according to a touching position of a touch body is improved, and accordingly user experience is improved. The method comprises the steps that sampling signals of at least one signal receiving unit are obtained, according to environment interference signals of the at least one signal receiving unit obtained in advance, the environment interference signals in the sampling signals of the at least one signal receiving unit are removed, and effective signals of the at least one signal receiving unit are obtained. According to the effective signals of the at least one signal receiving unit, the number of touch points and the positions of the touch points are determined. The method and device are suitable for situations in which the environment interference signals are filtered out for the touch screen.

Description

Method and device that a kind of antinoise signal disturbs
Technical field
The present invention relates to touch-screen field, relate in particular to method and device that a kind of antinoise signal disturbs.
Background technology
In recent years, infrared touch panel is simple in structure with it, be not subject to electric current, voltage and electrostatic interference, has high stability, high resolving power and the advantage such as easy for installation, becomes the main product in touch-screen market.Infrared signal touch-screen forms by being arranged on the circuit board of arranging on the housing, housing of screen periphery and the infrared signal power valve in circuit board transverse and longitudinal direction and infrared signal receiving tube.Wherein, infrared signal power valve and infrared signal receiving tube are corresponding one by one, and infrared signal power valve launches infrared signal, make to form on circuit board the infrared signal matrix that transverse and longitudinal is intersected.During infrared touch panel work, mainly to utilize densely covered infrared signal matrix in transverse and longitudinal direction to detect the touch that touches body, when touching the body touch a certain position of touch-screen, touch body and blocked the infrared signal through the transverse and longitudinal direction of this position, make the infrared signal receiving tube of correspondence position cannot receive infrared signal.When all infrared signal receiving tubes report main frame by the semaphore of its reception, the infrared signal receiving tube that does not receive infrared signal owing to touching body touch infrared touch panel is almost nil to the semaphore of main frame transmission.And normally receiving the infrared signal receiving tube of infrared signal, the semaphore sending to main frame is non-vanishing.The semaphore that now main frame can send according to the infrared signal receiving tube receiving is judged the number of touch point and the position of place screen.
Yet, in ambient light signal, include infrared signal composition, particularly when solar radiation, in surround lighting, infrared signal composition is higher, as shown in Figure 1, when touching body touch touch-screen, although touch body, blocked the infrared signal that part infrared signal power valve is launched, but in ambient light signal, the angle of infrared signal is random and exists in real time, make infrared signal receiving tube corresponding to infrared signal power valve that is blocked part still can receive the infrared signal in ambient light signal, so the semaphore that this part infrared signal receiving tube sends to main frame is non-vanishing.Now main frame is determined the touch point information of touch-screen according to the non-vanishing semaphore receiving.Because the infrared signal of the infrared transmitting tube transmitting body that has been touched blocks, therefore the infrared signal that its corresponding part infrared signal receiving tube receives is the infrared signal in ambient light signal, it not the infrared signal of infrared transmitting tube transmitting, that is to say, what its corresponding part infrared signal receiving tube received is undesired signal, the non-vanishing semaphore that this part infrared signal receiving tube sends to main frame is also the semaphore disturbing, when the semaphore of this interference of host computer using carries out touch point information judgement, can cause main frame erroneous judgement touch point information, affect the accuracy that touch-screen responds according to the position that touches body touch, reduced user's experience.
In prior art, in order to solve the problem of touch-screen ambient signal interference, a kind of hardware antinoise signal interference method is proposed.Hardware antinoise signal interference method is mainly that the design by touch-screen hardware circuit comes filtering environmental signal to disturb.Normally on hardware circuit, designed anti-ambient signal interfered circuit, by hardware circuit, control the frequency of infrared signal power valve transmitting infrared signal, use filtering circuit to filter out signals different from the frequency of infrared transmitting tube transmitting infrared signal in ambient light signal.But in this technology, if the infrared signal frequency in ambient light signal is identical with the frequency of infrared transmitting tube transmitting infrared signal, now by filtering circuit, the infrared signal in ambient light signal cannot be filtered out.When touching body touch touch-screen, although touch body, blocked the infrared signal that part infrared signal power valve is launched, because the infrared signal frequency in ambient light signal is to exist in real time with the identical signal of frequency of infrared transmitting tube transmitting infrared signal, make infrared signal receiving tube corresponding to infrared signal power valve that is blocked part still can receive the infrared signal in ambient light signal, so the semaphore that this part infrared signal receiving tube sends to main frame is non-vanishing.Now main frame is determined the touch point information of touch-screen according to the non-vanishing semaphore receiving.Because the infrared signal of the infrared transmitting tube transmitting body that has been touched blocks, therefore the infrared signal that its corresponding part infrared signal receiving tube receives is the infrared signal in ambient light signal, it not the infrared signal of infrared transmitting tube transmitting, that is to say, what its corresponding part infrared signal receiving tube received is undesired signal, the non-vanishing semaphore that this part infrared signal receiving tube sends to main frame is also the semaphore disturbing, when the semaphore of this interference of host computer using carries out touch point information judgement, can cause main frame erroneous judgement touch point information, affect the accuracy that touch-screen responds according to the position that touches body touch, reducing user experiences.
Summary of the invention
The invention provides method and device that a kind of antinoise signal disturbs, in order to by filtering out environmental interference signal, improve the accuracy that touch-screen responds according to the position that touches body touch, thereby improve user, experience.
For achieving the above object, the present invention adopts following technical scheme:
First aspect, a kind of method that the embodiment of the present invention provides antinoise signal to disturb, be applied to touching device, described touching device comprises: at least one signal receiving unit and at least one signal transmitter unit, described method comprises: the sampled signal of obtaining at least one signal receiving unit, described sampled signal comprises environmental interference signal and/or useful signal, and described useful signal is by least one signal transmitter unit transmitting, for determining the signal of touch point relevant information.Wherein, environmental interference signal is to determining that according to useful signal described touch point relevant information produces the signal disturbing.According to the environmental interference signal of at least one signal receiving unit obtaining in advance, the environmental interference signal described in eliminating in the sampled signal of at least one signal receiving unit, the useful signal of at least one signal receiving unit described in obtaining.According to described at least one signal receiving unit useful signal, determine the position of touch point number and touch point.
Second aspect, the invention provides a kind of touching device, and described touching device comprises: at least one signal receiving unit, at least one signal transmitter unit, acquiring unit, processing unit and determining unit.Described at least one signal transmitter unit, for sending useful signal to signal receiving unit.Described useful signal is the signal of described at least one signal transmitter unit transmitting.Described at least one signal receiving unit, for receiving sampled signal.Described sampled signal is for determining the signal of touch point relevant information.Described sampled signal comprises environmental interference signal and/or useful signal.Described environmental interference signal is to determining that according to useful signal described touch point relevant information produces the signal disturbing.Described acquiring unit, for obtaining the sampled signal of described at least one signal receiving unit.Described processing unit, the environmental interference signal of at least one signal receiving unit obtaining in advance for basis, environmental interference signal described in eliminating in the sampled signal of at least one signal receiving unit, the useful signal of at least one signal receiving unit described in obtaining.Described determining unit, for according to the useful signal of described at least one signal receiving unit, determines the position of touch point number and touch point.
The invention provides method and device that a kind of antinoise signal disturbs, obtain the sampled signal of at least one signal receiving unit, described sampled signal comprises environmental interference signal and/or useful signal, described useful signal is by least one signal transmitter unit transmitting, for determining the signal of touch point relevant information.Wherein, environmental interference signal is to determining that according to useful signal described touch point relevant information produces the signal disturbing.According to the environmental interference signal of at least one signal receiving unit obtaining in advance, the environmental interference signal described in eliminating in the sampled signal of at least one signal receiving unit, the useful signal of at least one signal receiving unit described in obtaining.According to described at least one signal receiving unit useful signal, determine the position of touch point number and touch point.Like this, when getting the sampled signal of signal receiving unit, the environmental interference signal that utilizes this signal receiving unit to obtain, the environmental interference signal comprising in the sampled signal that this signal receiving unit is obtained eliminates, thereby get the useful signal of signal receiving unit, thereby utilize the useful signal of signal receiving unit, determine position and the number of touch point, reduced according to environmental interference signal and determined the position of touch screen point and the possibility of number, be by the environmental interference target signal filter in sampled signal is fallen, reduced the erroneous judgement possibility of touch point, and then realized by filtering out environmental interference signal, improved the accuracy that touch-screen responds according to the position that touches body touch, thereby improved user's experience.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Contact erroneous judgement schematic diagram under a kind of signal that Fig. 1 provides for background technology of the present invention disturbs;
A kind of antinoise signal interference method process flow diagram that Fig. 2 provides for the embodiment of the present invention;
The another kind of antinoise signal interference method process flow diagram that Fig. 3 provides for the embodiment of the present invention;
The structural representation of a kind of touching device that Fig. 4 provides for the embodiment of the present invention;
The structural representation of the another kind of touching device that Fig. 5 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
A kind of method that the embodiment of the present invention provides antinoise signal to disturb, is applied on touching device, and described touching device comprises at least one signal receiving unit and at least one signal transmitter unit.
It should be noted that, this touching device can be infrared touching device, now, signal transmitter unit refers to the infrared signal power valve in infrared touching device, signal receiving unit refers to the infrared signal receiving tube in infrared touching device, in actual applications, the number of infrared signal power valve and infrared signal receiving tube is determined according to the size of touch-screen.
It should be noted that, this touching device can be other touching device, and the present invention does not limit touching device.
As shown in Figure 2, described method comprises:
201, obtain the sampled signal of described at least one signal receiving unit.
Wherein, described sampled signal is for determining the signal of touch point relevant information.Described sampled signal comprises environmental interference signal and/or useful signal; Described useful signal is the signal of described at least one signal transmitter unit transmitting.Described environmental interference signal is to determining that according to useful signal described touch point relevant information produces the signal disturbing.
Optionally, described sampled signal comprises: infrared sampled signal, now described environmental interference signal comprises: the infrared undesired signal of environment.
It should be noted that, sampled signal can also be other signals, and now, environmental interference signal is the undesired signal corresponding with sampled signal, and the present invention does not limit this.
Concrete, touching device is start signal transmitter unit and corresponding signal receiving unit successively, by sampling on signal receiving unit, obtains the sampled signal of signal receiving unit.
It should be noted that, when not touching body touch touching device, signal receiving unit can receive the useful signal of signal transmitter unit transmitting, and can receive the environmental interference signal in ambient light signal, the sampled signal that now touching device obtains comprises useful signal and environmental interference signal.When having the body of touch to touch touching device, owing to touching body, blocked the useful signal that part signal transmitter unit is launched, thereby make its corresponding signal receiving unit cannot receive the useful signal of this transmitter unit transmitting, can only receive the environmental interference signal in ambient light signal, the sampled signal that now touching device obtains by above-mentioned part signal receiving element only includes environmental interference signal.And the useful signal of the signal transmitter unit that other bodies that are not touched block transmitting can be received by its corresponding signal receiving unit, the sampled signal that now other signal receiving units of touching device obtain comprises useful signal and environmental interference signal.
202, according to the environmental interference signal of at least one signal receiving unit obtaining in advance, the environmental interference signal described in eliminating in the sampled signal of at least one signal receiving unit, the useful signal of at least one signal receiving unit described in obtaining.
Concrete, touching device is after having obtained the sampled signal of at least one signal receiving unit, owing to may having comprised environmental interference signal in sampled signal, now, can be according to the environmental interference signal of at least one signal receiving unit obtaining in advance, environmental interference signal in the sampled signal that at least one signal receiving unit is obtained eliminates, thereby can get the useful signal of at least one signal receiving unit.
It should be noted that, environmental interference signal obtained in advance before obtaining sampled signal.
Further, when not touching body touch touching device, the sampled signal that at least one signal receiving unit receives comprises signal and the environmental interference signal of signal transmitter unit transmitting, in the sampled signal that touching device obtains at described at least one signal receiving unit, eliminate environmental interference signal, get the useful signal of described at least one signal receiving unit.Owing to not touching body, touch touching device, so at least one signal receiving unit all can receive useful signal, wherein the useful signal of signal receiving unit is the signal that corresponding signal transmitter unit is launched, so the useful signal that at least one signal receiving unit obtains is non-vanishing.
When having the body of touch to touch touching device, owing to touching body, blocked the signal that part signal transmitter unit is launched, thereby make part signal receiving element corresponding to part signal transmitter unit being blocked can only receive environmental interference signal, now in the touching device sampled signal that signal receiving unit obtains in this section, eliminate after environmental interference signal, the useful signal of this part signal receiving unit obtaining is almost nil.And the useful signal that signal receiving unit corresponding to signal transmitter unit that other bodies that are not touched block obtains is non-vanishing.
203,, according to the useful signal of described at least one signal receiving unit, determine the position of touch point number and touch point.
Concrete, touching device gets the useful signal of at least one signal receiving unit, can compare according to predefined signal threshold value, thereby can determine the position that this signal receiving unit is corresponding according to comparative result, whether there is touch point, and then determine the number of touch point and the position of touch point.
When useful signal is more than or equal to this signal threshold value, can determine that the body that is not touched touches herein, being to determine does not have touch point herein.When useful signal is less than this signal threshold value, can determine that the body that is touched touches herein, being to determine has touch point herein, and records its position.Utilize said method, can determine the number of touch point and the position of touch point.
It should be noted that, signal threshold value sets in advance, when the useful signal that its value is greater than signal transmitter unit transmitting is blocked, and the useful signal that its corresponding signal receiving unit receives; When the signal that is less than signal transmitter unit transmitting is not blocked, the useful signal that its corresponding signal receiving unit receives.
Preferably, the value of signal threshold value is the useful signal of signal transmitter unit transmitting while not being blocked, 50% of the useful signal that its corresponding signal receiving unit receives.
It should be noted that, the useful signal receiving according to signal receiving unit determines that the number of current touch point and the method for position, touch point can also be additive methods, the signal for example receiving according to signal receiving unit in prior art determine the number of current touch point and the method for position, touch point identical, the present invention is not restricted this.
The invention provides a kind of method that antinoise signal disturbs, obtain the sampled signal of at least one signal receiving unit, described sampled signal comprises environmental interference signal and/or useful signal, described useful signal is by least one signal transmitter unit transmitting, for determining the signal of touch point relevant information.Wherein, environmental interference signal is to determining that according to useful signal described touch point relevant information produces the signal disturbing.According to the environmental interference signal of at least one signal receiving unit obtaining in advance, the environmental interference signal described in eliminating in the sampled signal of at least one signal receiving unit, the useful signal of at least one signal receiving unit described in obtaining.According to described at least one signal receiving unit useful signal, determine the position of touch point number and touch point.Like this, when getting the sampled signal of signal receiving unit, the environmental interference signal that utilizes this signal receiving unit to obtain, the environmental interference signal comprising in the sampled signal that this signal receiving unit is obtained eliminates, thereby get the useful signal of signal receiving unit, thereby utilize the useful signal of signal receiving unit, determine position and the number of touch point, reduced according to environmental interference signal and determined the position of touch screen point and the possibility of number, be by the environmental interference target signal filter in sampled signal is fallen, reduced the erroneous judgement possibility of touch point, and then realized by filtering out environmental interference signal, improved the accuracy that touch-screen responds according to the position that touches body touch, thereby improved user's experience.
A kind of method that the embodiment of the present invention provides antinoise signal to disturb, as shown in Figure 3, comprising:
301, obtain the environmental interference signal of described at least one signal receiving unit.
Concrete, touching device can, in the situation that described at least one signal transmitter unit is not all launched useful signal, obtain the environmental interference signal of described at least one signal receiving unit.
That is to say, touching device is by closing all signal transmitter units, then opens successively all signal receiving units, now, because all signal transmitter units are closed, do not transmit, so can not there is useful signal, signal receiving unit cannot receive useful signal like this.But have the environmental interference signal in surround lighting, signal receiving unit can receive this environmental interference signal.So in the situation that described at least one signal transmitter unit is not all launched useful signal, the signal that signal receiving unit receives is exactly environmental interference signal, and there is no useful signal.
It should be noted that, touching device can obtain the environmental interference signal of each signal receiving unit at least one signal receiving unit, environmental interference signal that also can acquisition unit sub-signal receiving element, and the present invention does not limit this.
Further, when touching device need to obtain the environmental interference signal of a plurality of signal receiving units, can utilize said method to obtain the environmental interference signal of each signal receiving unit in a plurality of signal receiving units.
Or touching device also can be by the grouping of at least one signal receiving unit, thereby can Yi Zuwei unit obtain the environmental interference signal of every group of signal receiving unit.Concrete grammar is as follows:
Number at described at least one signal receiving unit is greater than at 1 o'clock, and described at least one signal receiving unit is divided into E group, and in each group, comprises F signal receiving unit.In the situation that described at least one signal transmitter unit is not all launched useful signal, obtain the environmental interference signal of i signal receiving unit of each group in E group.Signal receiving unit in using the environmental interference signal of i signal receiving unit of each group in a described E group as group separately ought be last time environmental interference signal.
Wherein, E is greater than 0 integer, and F is greater than 0 integer, and the product of E and F is N, and N represents the number of described at least one signal receiving unit, and N is greater than 1 integer i=1, and 2 ..., F.
That is to say, touching device need to obtain the environmental interference signal of N signal receiving unit, and N signal receiving unit is divided into E group, and each group comprises F signal receiving unit.The environmental interference signal of some signal receiving units that each group can be obtained is as the environmental interference signal of each signal receiving unit of whole group.Preferably, can obtain centre position in each F of group signal receiving unit or approach the environmental interference signal of the signal receiving unit in centre position, using the environmental interference signal of the signal receiving unit of this environmental interference signal in whole group.By this method, can only need to obtain the environmental interference signal of E signal receiving unit, can know the environmental interference signal of all signal receiving units, and then can reduce the sampling time.
It should be noted that, touching device can also obtain the environmental interference signal of described at least one signal receiving unit with additive method, and the present invention does not limit this.
302, obtain the environmental interference signal interconversion rate of described at least one signal receiving unit.
It should be noted that, environmental interference change rate signal be for represent that signal receiving unit receives ought be last time environmental interference signal and the situation of last environmental interference signal intensity speed.The larger expression current environment of environmental interference change rate signal undesired signal changes rapidly, and the less expression current environment of environmental interference change rate signal undesired signal changes slowly.
It should be noted that, last environmental interference signal is the last secondary environment undesired signal of environmental interference signal that ought be last time.For example, if ought environmental interference signal last time be the environmental interference signal obtaining for the 3rd time, so last environmental interference signal be the environmental interference signal obtaining for the 2nd time.
Concrete, the method of obtaining the environmental interference signal interconversion rate of described at least one signal receiving unit is: according to the last environmental interference signal of at least one signal receiving unit, and described at least one signal receiving unit ought be last time environmental interference signal, obtain the environmental interference signal interconversion rate of described at least one signal receiving unit.
That is to say, obtained at least one signal receiving unit after environmental interference signal last time, can utilize its last environmental interference signal and environmental interference signal that ought be last time, obtain ought be last time environmental interference signal and difference or the ratio between last environmental interference signal, as the environmental interference signal interconversion rate of at least one signal receiving unit.
It should be noted that, can also utilize additive method to obtain environmental interference signal interconversion rate according to environmental interference signal that ought be last time and last environmental interference signal, the present invention limit this.
Preferably, can be according to formula obtain the environmental interference signal interconversion rate of described at least one signal receiving unit.
Wherein, P represents environment undesired signal interconversion rate, V 2represent first environment undesired signal; V 1represent second environment undesired signal.V ethe useful signal that represents signal receiving unit.
Described first environment undesired signal is that described at least one signal receiving unit obtains the environmental interference signal obtaining after described second environment undesired signal.
That is to say, first environment undesired signal is obtained after obtaining second environment undesired signal.For example, if first environment undesired signal is the environmental interference signal obtaining for the third time, second environment undesired signal is exactly the environmental interference signal obtaining for the second time so.
It should be noted that V ethe useful signal that represents signal receiving unit, is the signal that the signal transmitter unit corresponding with signal receiving unit launched.The signal of signal transmitter unit transmitting is that the physical characteristics by signal transmitter unit determines, thinks that the signal of each signal transmitter unit transmitting is certain, therefore can determine the V of each corresponding signal receiving unit efor constant.
The useful signal V of signal receiving unit e, first environment undesired signal V 2with second environment undesired signal V 1corresponding signal receiving unit is same signal receiving unit.Therefore, touching device can calculate according to above-mentioned formula the environmental interference signal interconversion rate of signal receiving unit, and the number of environmental interference signal interconversion rate and the number of signal receiving unit that calculate are identical.
It should be noted that, if the environmental interference signal obtaining is for the first time first environment undesired signal, be, now, there is no second environment undesired signal, cannot obtain environmental interference signal interconversion rate by said method, can set in advance environmental interference signal interconversion rate.
303,, according to the environmental interference signal interconversion rate of described at least one signal receiving unit, adjust the first sampling number.
Wherein, described the first sampling number is when obtaining twice environmental interference signal, the number of times that obtains sampled signal at interval.For example, the first sampling number is 10, obtains so and between twice environmental interference signal, needs to obtain 10 times sampled signal.
It should be noted that, within a certain period of time, if it is excessive that the first sampling number arranges, be and obtain excessive that the number of times of sampled signal arranges, while obtaining too small that the number of times of environmental interference signal arranges, when environmental change is rapid, touching device can not be sampled in time to vertiginous environmental interference signal, because the environmental interference signal having little time changing upgrades in time, can cause eliminating the phenomenon that environmental interference signal is blunt.Within a certain period of time, if it is too small that the first sampling number arranges, be and obtain too small that the number of times of signal sampling arranges, while obtaining excessive that the sampling number of environmental interference signal arranges, obtaining the time that environmental interference signal can affect judgement and the output of position, touch point of touch point more repeatedly, can make touching device occur the phenomenon of " card ".So just need touching device according to obtaining the number of times of sampled signal in the adaptive change certain hour of the situation of change of environmental interference signal, be and adjust the first sampling number, make it along with the situation of change real-time update of environment.
Concrete, according to the environmental interference signal interconversion rate of described at least one signal receiving unit, the method for adjusting the first sampling number is as follows:
In determining the environmental interference signal interconversion rate of described at least one signal receiving unit, have when at least the environmental interference signal interconversion rate of m signal receiving unit is all greater than the first preset value, according to the second preset value, adjust described the first sampling number.
Wherein, the first sampling number after adjustment is less than the first sampling number before adjustment; M is for being greater than 0, and is less than or equal to the integer of N; N represents the number of described at least one signal receiving unit.
Concrete, touching device is according to the 302 environmental interference signal interconversion rates that calculate N signal receiving unit, in these environmental interference signal interconversion rates, if there is the environmental interference signal interconversion rate that is not less than m signal receiving unit to be all greater than the first preset value, shown that now environmental interference signal intensity is rapid, touching device determines that the sampling number that need to increase environmental interference signal carrys out the vertiginous environmental interference signal of real-time update.Within a certain period of time, the number of times that obtains sampled signal by minimizing is realized the number of times of the sampling that increases environmental interference signal, the first sampling number can be deducted to the second preset value, thereby adjusts the first sampling number.
It should be noted that, the first preset value refers to acceptable environmental interference signal interconversion rate, be predefined, and the setting range of the first preset value is 0%～100%.The second preset value refers to the variable quantity of each adjustment the first sampling number, and this number of times variable quantity also sets in advance.
Exemplary, suppose that touching device has 10 signal receiving units, the first preset value is 40%, the second preset value is 10, the first sampling number is 100, and when having the environmental interference signal interconversion rate value of the signal receiving unit that is not less than 3 to be all greater than the first preset value, show that now environmental interference signal intensity is rapid.If calculate the environmental interference signal interconversion rate of 10 signal receiving units, be respectively p 1, p 2, p 3p 10, wherein have 6 p 1, p 2, p 4, p 6, p 9and p 10all be greater than 40%, can determine that current environment undesired signal changes rapidly, touching device determines that the sampling number that need to increase environmental interference signal carrys out the vertiginous environmental interference signal of real-time update.The first sampling number after adjusting so deducts the second preset value by hits for the first time and obtains, and is 100 and deducts 10, and getting the first sampling number is 90.
While having at the most the environmental interference signal interconversion rate of n signal receiving unit to be all greater than the first preset value in determining described at least one signal receiving unit in the environmental interference signal interconversion rate of each signal receiving unit, according to the second preset value, adjust described the first sampling number.
Wherein, the first sampling number after adjustment is greater than the first sampling number before adjustment; N is the integer that is less than m.
Concrete, touching device is according to the 302 environmental interference signal interconversion rates that calculate N signal receiving unit, in these environmental interference signal interconversion rates, if there is the environmental interference signal interconversion rate that is not more than n signal receiving unit to be all greater than the first preset value, shown that now environmental interference signal intensity is slow, touching device is determined the sampling number that need to reduce environmental interference signal.Within a certain period of time, the number of times that obtains sampled signal by increase is realized the number of times of the sampling that reduces environmental interference signal, can will on the first sampling number, deduct the second preset value, thereby adjusts the first sampling number.
Exemplary, suppose that touching device has 10 signal receiving units, the first preset value is 40%, the second preset value is 10, hits is 100 for the first time, and when having, be greater than when the environmental interference signal interconversion rate value of 2 signal receiving units is all greater than the first preset value, show that now environmental interference signal intensity is slow.If calculate 10, be respectively p 1, p 2, p 3p 10, wherein only have 1 p 3the environmental interference signal interconversion rate that is greater than 40%, 9 signal receiving unit is less than 40%, can determine that current environment undesired signal changes slowly, and touching device is determined the sampling number that need to reduce environmental interference signal.Hits for the first time after adjusting so adds that by the sampling of once sampling number the second preset value obtains, and is 100 and adds 10, and the first sampling number obtaining is 110.
It should be noted that, if the first sampling number is to obtain environmental interference signal sampling and for the second time number of times at environmental interference signal sampling interval for the first time for determining, this first sampling number sets in advance so.
304, obtain the sampled signal of described at least one signal receiving unit.
Concrete, touching device obtains the sampled signal method of described at least one signal receiving unit with consistent described in 201, repeats no more herein.
It should be noted that, the present invention does not limit the order between step 304 and step 301-303.Can first perform step 301-303, then perform step 304; Also can first perform step 304, at execution step 301-303; Can also perform step 301-303 and step 304 simultaneously.In diagram, express a kind of.
305, obtain the useful signal of described at least one signal receiving unit.
Concrete, touching device obtains the method for useful signal that ought be last time can refer step 202, repeats no more herein.
306,, according to the useful signal of described at least one signal receiving unit, determine the position of touch point number and touch point.
Concrete, touching device is according to the useful signal of described at least one signal receiving unit, determines that the method for position of touch point number and touch point is consistent with method described in 203, repeats no more herein.
307, determining behind the position of touch point number last time and touch point, upgrade sampling number.
Wherein, described sampling number refers to that signal receiving unit obtains the number of times of sampled signal.
Concrete, when touching device is according to the useful signal of at least one signal receiving unit, determine behind the position of arriving in touch point number and touch point, the sampling number of record can be added to 1, thereby upgrade sampling number.
It should be noted that, upgrading sampling number can also be additive method, for example, the sampling number of record is increased to b, and b is greater than 1 number, and the present invention does not limit this.
It should be noted that, before obtaining for the first time sampled signal, setting sampling number initial value is 0.
308, according to the sampling number of described touch point number and record, again obtain the sampled signal of signal receiving unit.
Concrete, different according to the sampling number of touch point number that ought be last time and record, the process of sampled signal of again obtaining signal receiving unit is different, specific as follows:
Sampling number at record reaches the first sampling number, and touch point number is while being not more than the 3rd preset value, again obtains the environmental interference signal of described at least one signal receiving unit.
Concrete, touching device compares the sampling number of record and the first sampling number, when sampling number and first sampling number of record equates, and when the touch point number that touching device is determined is not more than the 3rd preset value, touching device can be ignored touch point thus and the error of obtaining environmental interference signal that causes, again obtains the environmental interference signal of described at least one signal receiving unit.Be that the touch point number that touching device is determined is while being not more than the 3rd preset value, current may have the body of touch to touch touching device.Owing to touching body, touch touching device, make the environmental interference signal of at least one signal receiving unit that touching device obtains have certain error.Current touch point number is that while being not more than the 3rd preset value, this error is negligible, and now, touching device can obtain the environmental interference signal of described at least one signal receiving unit again.
Preferably, the 3rd preset value is zero.Now, at the sampling number of record, reach the first sampling number, and the number of touch point is while being zero, illustrate that touching device does not touch body when the sampling number recording reaches the first sampling number.Like this, touching device can obtain the environmental interference signal of signal receiving unit when not touching body, and the environmental interference signal now obtaining is the most accurate.
It should be noted that, the 3rd preset value sets in advance.
Or, at the sampling number of record, reach described the first sampling number, and definite touch point number is while being greater than the 3rd preset value, again obtains the sampled signal of at least one signal receiving unit, and the sampling number of described record is updated to zero.
Concrete, touching device compares the sampling number of record and the first sampling number, when the sampling number of record equates with the first sampling number, when but touching device is determined touch point number and is greater than the 3rd preset value, can again obtain the sampled signal of at least one signal receiving unit so, and the sampling number of described record is updated to zero.
Or, when the sampling number of record does not reach described the first sampling number, again obtain the sampled signal of at least one signal receiving unit.
Concrete, touching device compares the sampling number of record and the first sampling number, when the sampling number of record is less than the first sampling number, whether no matter touching device is determined ought touch point number last time be greater than the 3rd preset value, so all needs again to obtain the sampled signal of at least one signal receiving unit.
The invention provides a kind of method that antinoise signal disturbs, obtain the sampled signal of at least one signal receiving unit, described sampled signal comprises environmental interference signal and/or useful signal, described useful signal is by least one signal transmitter unit transmitting, for determining the signal of touch point relevant information.Wherein, environmental interference signal is to determining that according to useful signal described touch point relevant information produces the signal disturbing.According to the environmental interference signal of at least one signal receiving unit obtaining in advance, the environmental interference signal described in eliminating in the sampled signal of at least one signal receiving unit, the useful signal of at least one signal receiving unit described in obtaining.According to described at least one signal receiving unit useful signal, determine the position of touch point number and touch point.Like this, when getting the sampled signal of signal receiving unit, the environmental interference signal that utilizes this signal receiving unit to obtain, the environmental interference signal comprising in the sampled signal that this signal receiving unit is obtained eliminates, thereby get the useful signal of signal receiving unit, thereby utilize the useful signal of signal receiving unit, determine position and the number of touch point, reduced according to environmental interference signal and determined the position of touch screen point and the possibility of number, be by the environmental interference target signal filter in sampled signal is fallen, reduced the erroneous judgement possibility of touch point, and then realized by filtering out environmental interference signal, improved the accuracy that touch-screen responds according to the position that touches body touch, thereby improved user's experience.
The embodiment of the present invention provides a kind of touching device, and as shown in Figure 4, described touching device comprises: at least one signal transmitter unit 401, at least one signal receiving unit 402, acquiring unit 403, processing unit 404 and determining unit 405.
It should be noted that, this touching device can be infrared touching device, now, at least one signal receiving unit 402 refers to the infrared signal power valve in infrared touching device, at least one signal transmitter unit 401 refers to the infrared signal receiving tube in infrared touching device, in actual applications, the number of infrared signal power valve and infrared signal receiving tube is determined according to the size of touch-screen.Certainly, this touching device can be other touching device, and the present invention does not limit touching device.
Described at least one signal transmitter unit 401, for sending useful signal to signal receiving unit 402.
Wherein, described useful signal is the signal of described at least one signal transmitter unit 401 transmitting.
Described at least one signal receiving unit 402, for receiving sampled signal.
Wherein, described sampled signal is that described sampled signal comprises environmental interference signal and/or useful signal for determining the signal of touch point relevant information.Described environmental interference signal is to determining that according to useful signal described touch point relevant information produces the signal disturbing.
Described acquiring unit 403, for obtain described at least one signal receiving unit 402 ought be last time sampled signal.
Optionally, described sampled signal comprises: infrared sampled signal, now described environmental interference signal comprises: the infrared undesired signal of environment.
It should be noted that, sampled signal can also be other signals, and now, environmental interference signal is the undesired signal corresponding with sampled signal, and the present invention does not limit this.
Concrete, start signal transmitter unit 401 and corresponding signal receiving unit 402 successively, acquiring unit 403, by sampling on signal receiving unit 402, obtains the sampled signal of signal receiving unit 402.
It should be noted that, when not touching body touch touching device, signal receiving unit 402 can receive the useful signal of signal transmitter unit 401 transmittings, and can receive the environmental interference signal in ambient light signal, the sampled signal that now acquiring unit 403 obtains comprises useful signal and environmental interference signal.When having the body of touch to touch touching device, owing to touching body, blocked the useful signal that part signal transmitter unit 401 is launched, thereby make its corresponding signal receiving unit 402 cannot receive the useful signal of this transmitter unit transmitting, can only receive the environmental interference signal in ambient light signal, the sampled signal that now acquiring unit 403 obtains by above-mentioned part signal receiving element 402 only includes environmental interference signal.And the useful signal of signal transmitter unit 401 transmittings that other bodies that are not touched block can be received by its corresponding signal receiving unit 402, the sampled signal that now acquiring unit 403 obtains from other signal receiving units 402 comprises useful signal and environmental interference signal.
Processing unit 404, the environmental interference signal of at least one signal receiving unit 402 obtaining in advance for basis, environmental interference signal described in eliminating in the sampled signal of at least one signal receiving unit 402, obtains described at least one signal receiving unit 402 useful signal.
Concrete, processing unit 404 has obtained after the sampled signal of at least one signal receiving unit 402 at acquiring unit 403, owing to may having comprised environmental interference signal in sampled signal, now, can be according to the environmental interference signal of at least one signal receiving unit 402 obtaining in advance, environmental interference signal in the sampled signal that at least one signal receiving unit 402 is obtained eliminates, thereby can get the useful signal of at least one signal receiving unit 402.
It should be noted that, environmental interference signal obtained in advance before obtaining sampled signal.
Further, when not touching body touch touching device, the sampled signal that at least one signal receiving unit 402 receives comprises signal and the environmental interference signal of signal transmitter unit 401 transmittings, in the sampled signal that processing unit 404 obtains at described at least one signal receiving unit 402, eliminate environmental interference signal, get the useful signal of each signal receiving unit 402.Owing to not touching body, touch touching device, so each at least one signal receiving unit 402 all can receive useful signal, wherein the useful signal of signal receiving unit 402 is signals that corresponding signal transmitter unit 401 is launched, so the useful signal of at least one signal receiving unit 402 that processing unit 404 obtains is non-vanishing.
When having the body of touch to touch touching device, owing to touching body, blocked the signal that part signal transmitter unit 401 is launched, thereby make the part signal receiving element 402 of part signal transmitter unit 401 correspondences that are blocked can only receive environmental interference signal, now in processing unit 404 sampled signal that signal receiving unit 402 obtains in this section, eliminate after environmental interference signal, the useful signal of this part signal receiving unit 402 that processing unit 404 obtains is almost nil.And the signal receiving unit 402 of signal transmitter unit 401 correspondences of blocking for other bodies that are not touched, the useful signal that processing unit 404 obtains is non-vanishing.
Determining unit 405, for according to the useful signal of described at least one signal receiving unit 402, determines the position of touch point number and touch point.
Concrete, determining unit 405 is according to the useful signal of at least one signal receiving unit 402 obtaining, compare with predefined signal threshold value, thereby whether the position that can determine these signal receiving unit 402 correspondences according to comparative result has touch point, and then determines the number of touch point and the position of touch point.
When useful signal is more than or equal to this signal threshold value, 405 of determining units can determine that the body that is not touched touches herein, and being to determine does not have touch point herein.When useful signal is less than this signal threshold value, 405 of determining units can determine that the body that is touched touches herein, and being to determine has touch point herein, and records its position.Utilize said method, determining unit 405 can be determined the number of touch point and the position of touch point.
It should be noted that, signal threshold value sets in advance, when the useful signal that its value is greater than signal transmitter unit 401 transmitting is blocked, and the useful signal that its corresponding signal receiving unit 402 receives; When the signal that is less than signal transmitter unit 401 transmitting is not blocked, the useful signal that its corresponding signal receiving unit 402 receives.
Preferably, the value of signal threshold value is the useful signal of signal transmitter unit 401 transmitting while not being blocked, 50% of the useful signal that its corresponding signal receiving unit 402 receives.
It should be noted that, the useful signal that determining unit 405 receives according to signal receiving unit 402 determines that the number of current touch point and the method for position, touch point can also be additive methods, for example with the signal receiving according to signal receiving unit in prior art determine the number of current touch point and the method for position, touch point identical, the present invention is not restricted this.
Described acquiring unit 403, also for obtaining the environmental interference signal of described at least one signal receiving unit 402.
Concrete, described acquiring unit 403, specifically in the situation that described at least one signal transmitter unit 401 is not all launched useful signal, obtains the environmental interference signal of described at least one signal receiving unit 402.
That is to say, acquiring unit 403 is by closing all signal transmitter units 401, open successively more all signal receiving units 402, now, because all signal transmitter units 401 are closed, do not transmit, so can not there is useful signal, signal receiving unit 402 cannot receive useful signal like this.But have the environmental interference signal in surround lighting, signal receiving unit 402 can receive this environmental interference signal.So in the situation that described at least one signal transmitter unit 401 is not all launched useful signal, the signal that signal receiving unit 402 receives is exactly environmental interference signal, and there is no useful signal, like this, acquiring unit 403 can obtain environmental interference signal by signal receiving unit 402.
It should be noted that, acquiring unit 403 can obtain the environmental interference signal of all signal receiving units 402 at least one signal receiving unit 402, environmental interference signal that also can acquisition unit sub-signal receiving element 402, and the present invention does not limit this.
Further, when acquiring unit 403 need to obtain the environmental interference signal of a plurality of signal receiving units 402, can utilize said method to obtain the environmental interference signal of a plurality of signal receiving units 402.
Or touching device also can be by 402 groupings of at least one signal receiving unit, thereby acquiring unit 403 can Yi Zuwei unit obtains the environmental interference signal of every group of signal receiving unit 402.Concrete grammar is as follows:
Acquiring unit 403, is greater than at 1 o'clock specifically for the number at described at least one signal receiving unit 402, and described at least one signal receiving unit 402 is divided into E group, and in each group, comprises F signal receiving unit 402.In the situation that described at least one signal transmitter unit 401 is not all launched useful signal, obtain the environmental interference signal of i signal receiving unit 402 of each group in E group.The environmental interference signal of the signal receiving unit 402 in using the environmental interference signal of i signal receiving unit 402 of each group in a described E group as group separately.
Wherein, E is greater than 0 integer, and F is greater than 0 integer, and the product of E and F is N, and N represents the number of described at least one signal receiving unit, and N is greater than 1 integer, i=1, and 2 ..., F.
That is to say, touching device need to obtain the environmental interference signal of N signal receiving unit 402, N signal receiving unit 402 is divided into E group, each group comprises F signal receiving unit 402, and the dry signal of environment of some signal receiving units 402 that each group can be obtained is as the environmental interference signal of each signal receiving unit 402 of whole group.Preferably, can obtain centre position in each F of group signal receiving unit 402 or approach the environmental interference signal of the signal receiving unit 402 in centre position, the environmental interference signal of the signal receiving unit 402 using this environmental interference signal in whole group.By this method, acquiring unit 403 can only need to obtain the environmental interference signal of E signal receiving unit 402, can know the environmental interference signal of all signal receiving units 402, and then can reduce the sampling time.
It should be noted that, described acquiring unit 403 can also obtain the environmental interference signal of described at least one signal receiving unit 402 with additive method, and the present invention does not limit this.
Described acquiring unit 403, also for obtaining the environmental interference signal interconversion rate of described at least one signal receiving unit 402.
It should be noted that, environmental interference change rate signal be for represent that signal receiving unit 402 receives ought be last time environmental interference signal and the situation of last environmental interference signal intensity speed.The larger expression current environment of environmental interference change rate signal undesired signal changes rapidly, and the less expression current environment of environmental interference change rate signal undesired signal changes slowly.
It should be noted that, last environmental interference signal is the last secondary environment undesired signal of environmental interference signal that ought be last time.For example, if ought environmental interference signal last time be the environmental interference signal obtaining for the 3rd time, so last environmental interference signal be the environmental interference signal obtaining for the 2nd time.
Concrete, acquiring unit 403 is for according to the last environmental interference signal of at least one signal receiving unit 402, and described at least one signal receiving unit 402 ought be last time environmental interference signal, obtain described at least one signal and receive single 402 environmental interference signal interconversion rate.
That is to say, acquiring unit 403 obtained at least one signal receiving unit 402 after environmental interference signal last time, acquiring unit 403 can utilize its last environmental interference signal and environmental interference signal that ought be last time, obtain ought be last time environmental interference signal and difference or the ratio between last environmental interference signal, as the environmental interference signal interconversion rate of at least one signal receiving unit 402.
It should be noted that, acquiring unit 403 can also utilize additive method to obtain environmental interference signal interconversion rate according to environmental interference signal that ought be last time and last environmental interference signal, and the present invention does not limit this.
Preferably, described acquiring unit 403, specifically for can be according to formula obtain the environmental interference signal interconversion rate of each signal receiving unit 402 in described at least one signal receiving unit 402.
Wherein, P represents environment undesired signal interconversion rate, V 2represent first environment undesired signal; V 1represent second environment undesired signal, V ethe useful signal that represents signal receiving unit.
Described first environment undesired signal is that described at least one signal receiving unit 402 obtains the environmental interference signal obtaining after described second environment undesired signal.
That is to say, first environment undesired signal is obtained after obtaining second environment undesired signal.For example, if first environment undesired signal is the environmental interference signal obtaining for the third time, second environment undesired signal is exactly the environmental interference signal obtaining for the second time so.
It should be noted that V ethe useful signal that represents signal receiving unit 402, is the signal that the signal transmitter unit 401 corresponding with signal receiving unit 402 launched.The signal of signal transmitter unit 401 transmitting is that the physical characteristics by signal transmitter unit 401 determines, thinks that the signal of each signal transmitter unit 401 transmitting is certain, therefore can determine the V of each corresponding signal receiving unit 402 efor constant.
The useful signal V of signal receiving unit 402 e, first environment undesired signal V 2with second environment undesired signal V 1corresponding signal receiving unit 402 is same signal receiving units 402.Therefore, acquiring unit 403 can calculate according to above-mentioned formula the environmental interference signal interconversion rate of each signal receiving unit 402, and the number of environmental interference signal interconversion rate and the number of signal receiving unit 402 that obtain are identical.
Further, described touching device, as shown in Figure 5, also comprises: adjustment unit 406.
Described adjustment unit 406, for the environmental interference signal interconversion rate of described at least one signal receiving unit 402 of obtaining according to described acquiring unit 403, adjusts the first sampling number.
Wherein, described the first sampling number is while obtaining twice undesired signal, the number of times that obtains sampled signal at interval.For example, the first sampling number is 10, obtains so and between twice environmental interference signal, needs to obtain 10 times sampled signal.
Concrete, described adjustment unit 406 is according to the environmental interference signal interconversion rate of described at least one signal receiving unit 402, and the method for adjusting the first sampling number is as follows:
In determining the environmental interference signal interconversion rate of described at least one signal receiving unit 402, have when at least the environmental interference signal interconversion rate of m signal receiving unit 402 is all greater than the first preset value, according to the second preset value, adjust described the first sampling number.
Wherein, the first sampling number after adjustment is less than the first sampling number before adjustment; M is for being greater than 0, and is less than or equal to the integer of N; N represents the number of described at least one signal receiving unit 402.
While having at the most the environmental interference signal interconversion rate of n signal receiving unit 402 to be all greater than the first preset value, according to described the second preset value, adjust described the first sampling number in the environmental interference signal interconversion rate of determining described at least one signal receiving unit 402.
Wherein, the first sampling number after adjustment is greater than the first sampling number before adjustment; N is the integer that is less than m.
Further, described touching device, also comprises: updating block 407.
Described updating block 407, during for position in the definite touch point number of described determining unit 405 and touch point, upgrades sampling number.
Wherein, described sampling number refers to that signal receiving unit 402 obtains the number of times of sampled signal.
Concrete, when touching device is according to the useful signal of at least one signal receiving unit 402, while determining the position of touch point number and touch point, updating block 407 can add 1 by the sampling number of record, upgrades sampling number.
It should be noted that, it can also be additive method that updating block 407 upgrades sampling number, for example, the sampling number of record is increased to b, and b is greater than 1 integer, and the present invention does not limit this.
It should be noted that, before obtaining for the first time sampled signal, setting sampling number initial value is 0.
Further, acquiring unit 403, also reaches the first sampling number for the sampling number at record, and touch point number is while being not more than the 3rd preset value, again obtains the environmental interference signal of described at least one signal receiving unit 402.
Or described acquiring unit 403, while also not reaching described the first sampling number for the sampling number at record, obtains the sampled signal of at least one signal receiving unit 402 again.
Or, described acquiring unit 403, also for the sampling number at record, reach described the first sampling number, and when touch point number is greater than the 3rd preset value, again obtain the sampled signal of at least one signal receiving unit 402, and trigger described updating block 407 described sampling number is updated to zero.
Now, described updating block 407, also for being updated to the sampling number of described record zero.
Preferably, the 3rd preset value is zero.
The invention provides method and device that a kind of antinoise signal disturbs, obtain the sampled signal of at least one signal receiving unit, described sampled signal comprises environmental interference signal and/or useful signal, described useful signal is by least one signal transmitter unit transmitting, for determining the signal of touch point relevant information.Wherein, environmental interference signal is to determining that according to useful signal described touch point relevant information produces the signal disturbing.According to the environmental interference signal of at least one signal receiving unit obtaining in advance, the environmental interference signal described in eliminating in the sampled signal of at least one signal receiving unit, the useful signal of at least one signal receiving unit described in obtaining.According to described at least one signal receiving unit useful signal, determine the position of touch point number and touch point.Like this, when getting the sampled signal of signal receiving unit, the environmental interference signal that utilizes this signal receiving unit to obtain, the environmental interference signal comprising in the sampled signal that this signal receiving unit is obtained eliminates, thereby get the useful signal of signal receiving unit, thereby utilize the useful signal of signal receiving unit, determine position and the number of touch point, reduced according to environmental interference signal and determined the position of touch screen point and the possibility of number, be by the environmental interference target signal filter in sampled signal is fallen, reduced the erroneous judgement possibility of touch point, and then realized by filtering out environmental interference signal, improved the accuracy that touch-screen responds according to the position that touches body touch, thereby improved user's experience.
Above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (13)

1. the method that antinoise signal disturbs, is characterized in that, be applied to touching device, described touching device comprises: at least one signal receiving unit and at least one signal transmitter unit, and described method comprises:
Obtain the sampled signal of described at least one signal receiving unit; Described sampled signal is for determining the signal of touch point relevant information; Described sampled signal comprises environmental interference signal and/or useful signal; Described useful signal is the signal of described at least one signal transmitter unit transmitting; Described environmental interference signal is to determining that according to useful signal described touch point relevant information produces the signal disturbing;
According to the environmental interference signal of at least one signal receiving unit obtaining in advance, the environmental interference signal described in eliminating in the sampled signal of at least one signal receiving unit, the useful signal of at least one signal receiving unit described in obtaining;
According to described at least one signal receiving unit useful signal, determine the position of touch point number and touch point.
2. method according to claim 1, is characterized in that, the environmental interference signal of at least one signal receiving unit obtaining in advance in described basis, before the environmental interference signal described in eliminating in the sampled signal of at least one signal receiving unit, also comprises:
Number at described at least one signal receiving unit is greater than at 1 o'clock, and described at least one signal receiving unit is divided into E group, and in each group, comprises F signal receiving unit; Wherein, E is greater than 0 integer, and F is greater than 0 integer, and the product of E and F is N, and N represents the number of described at least one signal receiving unit, and N is greater than 1 integer;
In the situation that described at least one signal transmitter unit is not all launched useful signal, obtain the environmental interference signal of i signal receiving unit of each group in E group; Wherein, i=1,2 ..., F;
The environmental interference signal of the signal receiving unit in using the environmental interference signal of i signal receiving unit of each group in a described E group as group separately.
3. method according to claim 1 and 2, is characterized in that, also comprises:
Obtain the environmental interference signal interconversion rate of described at least one signal receiving unit;
According to the environmental interference signal interconversion rate of described at least one signal receiving unit, adjust the first sampling number; Described the first sampling number is while obtaining twice undesired signal, the number of times that obtains sampled signal at interval.
4. method according to claim 3, is characterized in that, the environmental interference signal interconversion rate of at least one signal receiving unit described in described basis is adjusted the first sampling number and comprised:
In determining the environmental interference signal interconversion rate of described at least one signal receiving unit, have when at least the environmental interference signal interconversion rate of m signal receiving unit is all greater than the first preset value, according to the second preset value, adjust described the first sampling number; Wherein, the first sampling number after adjustment is less than the first sampling number before adjustment; M is for being greater than 0, and is less than or equal to the integer of N; N represents the number of described at least one signal receiving unit;
While having at the most the environmental interference signal interconversion rate of n signal receiving unit to be all greater than the first preset value, according to described the second preset value, adjust described the first sampling number in the environmental interference signal interconversion rate of determining described at least one signal receiving unit; Wherein, the first sampling number after adjustment is greater than the first sampling number before adjustment; N is the integer that is less than m.
5. according to the method described in claim 3 or 4, it is characterized in that, described in obtain described at least one signal receiving unit environmental interference signal interconversion rate comprise:
According to formula obtain the environmental interference signal interconversion rate of described at least one signal receiving unit; Wherein, P represents environment undesired signal interconversion rate, V 2represent first environment undesired signal; V 1represent second environment undesired signal, described first environment undesired signal is that described at least one signal receiving unit obtains the environmental interference signal obtaining after described second environment undesired signal; V ethe useful signal that represents signal receiving unit.
6. according to the method described in claim 3-5 any one, it is characterized in that, the useful signal at least one signal receiving unit described in described basis, after determining the position of touch point number and touch point, also comprises:
When determining the position of touch point number and touch point, upgrade sampling number; Described sampling number refers to that signal receiving unit obtains the number of times of sampled signal;
Sampling number at record reaches the first sampling number, and touch point number is while being not more than the 3rd preset value, again obtains the environmental interference signal of described at least one signal receiving unit; Or,
Sampling number at record does not reach described the first sampling number, again obtains the sampled signal of at least one signal receiving unit; Or,
Sampling number at record reaches described the first sampling number, and touch point number is while being greater than the 3rd preset value, again obtains the sampled signal of at least one signal receiving unit, and the sampling number of described record is updated to zero.
7. according to the method described in claim 1-6 any one, it is characterized in that,
Described sampled signal comprises: infrared sampled signal;
Described environmental interference signal comprises: the infrared undesired signal of environment.
8. a touching device, is characterized in that, comprising: at least one signal receiving unit, at least one signal transmitter unit, acquiring unit, processing unit and determining unit;
Described at least one signal transmitter unit, for sending useful signal to signal receiving unit; Described useful signal is the signal of described at least one signal transmitter unit transmitting;
Described at least one signal receiving unit, for receiving sampled signal; Described sampled signal is for determining the signal of touch point relevant information; Described sampled signal comprises environmental interference signal and/or useful signal; Described environmental interference signal is to determining that according to useful signal described touch point relevant information produces the signal disturbing;
Described acquiring unit, for obtaining the sampled signal of described at least one signal receiving unit;
Described processing unit, the environmental interference signal of at least one signal receiving unit obtaining in advance for basis, environmental interference signal described in eliminating in the sampled signal of at least one signal receiving unit, the useful signal of at least one signal receiving unit described in obtaining;
Described determining unit, for according to the useful signal of described at least one signal receiving unit, determines the position of touch point number and touch point.
9. device according to claim 8, is characterized in that,
Described acquiring unit, is also greater than at 1 o'clock for the number at described at least one signal receiving unit, and described at least one signal receiving unit is divided into E group, and in each group, comprises F signal receiving unit; Wherein, E is greater than 0 integer, and F is greater than 0 integer, and the product of E and F is N, and N represents the number of described at least one signal receiving unit, and N is greater than 1 integer;
In the situation that described at least one signal transmitter unit is not all launched useful signal, obtain the environmental interference signal of i signal receiving unit of each group in E group; Wherein, i=1,2 ..., F;
The environmental interference signal of the signal receiving unit in using the environmental interference signal of i signal receiving unit of each group in a described E group as group separately.
10. device according to claim 8 or claim 9, is characterized in that, also comprises: adjustment unit;
Described acquiring unit, also for obtaining the environmental interference signal interconversion rate of described at least one signal receiving unit;
Described adjustment unit, for the environmental interference signal interconversion rate of described at least one signal receiving unit of obtaining according to described acquiring unit, adjusts the first sampling number; Described the first sampling number is while obtaining twice undesired signal, the number of times that obtains sampled signal at interval.
11. devices according to claim 10, is characterized in that,
Described adjustment unit, specifically in determining the environmental interference signal interconversion rate of described at least one signal receiving unit, have when at least the environmental interference signal interconversion rate of m signal receiving unit is all greater than the first preset value, according to the second preset value, adjust described the first sampling number; Wherein, the first sampling number after adjustment is less than the first sampling number before adjustment; M is for being greater than 0, and is less than or equal to the integer of N; N represents the number of described at least one signal receiving unit;
While having at the most the environmental interference signal interconversion rate of n signal receiving unit to be all greater than the first preset value, according to described the second preset value, adjust described the first sampling number in the environmental interference signal interconversion rate of determining described at least one signal receiving unit; Wherein, the first sampling number after adjustment is greater than the first sampling number before adjustment; N is the integer that is less than m.
12. according to the device described in claim 10 or 11, it is characterized in that,
Described acquiring unit, specifically for according to formula obtain the environmental interference signal interconversion rate of described at least one signal receiving unit; Wherein, P represents environment undesired signal interconversion rate, V 2represent first environment undesired signal; V 1represent second environment undesired signal, described first environment undesired signal is that described at least one signal receiving unit obtains the environmental interference signal obtaining after described second environment undesired signal; V ethe useful signal that represents signal receiving unit.
13. according to the device described in claim 10-12 any one, it is characterized in that, also comprises:
Updating block, during for position in the definite touch point number of described determining unit and touch point, upgrades sampling number; Described sampling number refers to that signal receiving unit obtains the number of times of sampled signal;
Described acquiring unit, also reaches the first sampling number for the sampling number at record, and touch point number is while being not more than the 3rd preset value, again obtains the environmental interference signal of described at least one signal receiving unit; Or,
Described acquiring unit, does not also reach described the first sampling number for the sampling number at record, again obtains the sampled signal of at least one signal receiving unit; Or,
Described acquiring unit, also for the sampling number at record, reach described the first sampling number, and when touch point number is greater than the 3rd preset value, again obtain the sampled signal of at least one signal receiving unit, and trigger described updating block described sampling number is updated to zero;
Described updating block, also for being updated to the sampling number of described record zero.
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