CN101916153A - Method, device and terminal for positioning touch point of touch screen - Google Patents

Abstract

The invention provides a method, a device and a terminal for positioning a touch point of a touch screen, which relate to the field of touch screens and aim to solve the technical problem of higher requirement of a touch device on the ambient environment in the prior art. The method for positioning a touch point of a touch screen comprises the following steps of: 1. obtaining the time a sound wave signal derived from the touch point arrives at three different detecting points of the touch screen; and 2. obtaining the position of the touch point according to the arrival time and the positions of the detecting points. The invention has high adaptability to environment.

Description

The localization method of the touch point of touch-screen, device and terminal

Technical field

The present invention relates to the touch-screen field, be meant a kind of localization method, device and terminal of touch point of touch-screen especially.

Background technology

Along with growing with each passing day of interaction of multimedia information, people utilize touch-screen more and more.Touch-screen has to be saved the space, is easy to advantage such as interchange, is extremely attractive brand-new multimedia interactive device.Touch-screen is boundless in the range of application in the whole world, for example inquiry of public information, corporate business inquiry, panel computer, PDA (personal digital assistant), Industry Control, electronic game, choosing song or selecting dish, multimedia teaching, real estate sale or the like.Along with the rise of Smart Home and Internet of Things, touch-screen also has very large application potential at aspects such as family and control terminals.The application of touch-screen on mobile phone, fashion is frivolous more to allow the profile of mobile phone become, and has also increased the cordial feeling of man-machine direct interaction, causes warmly pursuing of consumer.

Existing capacitive touch screen is for utilizing the electromagnetic field of human body.Finger siphons away Weak current from contact point, calculates contact point by the current value of measuring four electrodes, when environment temperature, when environment of electric field changes, all can cause the drift and the maloperation of capacitance plate.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of localization method, device and terminal of touch point of touch-screen, the acoustic signals that produces in the time of can being touched according to touch-screen, determine touch point position, thereby determine the operation intention of user on touch-screen, to the adaptive faculty of environment than higher.

For solving the problems of the technologies described above, embodiments of the invention provide technical scheme as follows:

On the one hand, provide a kind of localization method of touch point of touch-screen, comprising:

Step 1 was obtained from the acoustic signals of touch point time of arrival at three different check points of touch-screen;

Step 2 according to the position of described time of arrival and described check point, is obtained described touch point position.

Before the described step 1, also comprise:

According to the frequency of described three detected acoustic signals of different check points, judge that whether described acoustic signals is from same touch point.

After the described step 2, described method also comprises:

According to default calibration equation, described touch point position is calibrated.

Before the described step 2, also comprise:

Respectively described acoustic signals is carried out low frequency and strengthen and the energy processing and amplifying, generate the acoustic signals after handling;

Whether the frequency energy of the described acoustic signals after the judgment processing is all greater than predetermined threshold;

If judged result then abandons described acoustic signals for not.

Described step 2 comprises:

A two-dimensional coordinate system is set on plane at the touch-screen place;

Calculate described acoustic signals the time of arrival of first check point Ta and described acoustic signals the difference Δ T1 of the very first time between the time of arrival of second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming Δ T2 between the time of arrival of second check point Tb;

According to the predetermined party formula, calculate described touch point position;

Described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\ΔT}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}|=\mathrm{\ΔT}2*V$

Wherein, V is the velocity of propagation of sound wave, D` <sub>x</sub>And D` _yBe respectively the horizontal ordinate and the ordinate of position, touch point; A _yAnd A _xBe respectively the horizontal ordinate and the ordinate of first check point; B _xAnd B _yBe respectively the horizontal ordinate and the ordinate of second check point; C _xAnd C _yBe respectively the horizontal ordinate and the ordinate of the 3rd check point.

Described calibration equation is:

D _x=(D` _x+ offset.x) * gain.x/ accuracy value

D _y=(D` _y+ offset.y) * gain.y/ accuracy value

Wherein, D`x and D`y are the coordinate figure of position, touch point, Dx and Dy are the coordinate figure of the position, touch point after calibrating, gain.x is the amplification factor on the X-axis, offset.x is the side-play amount on the X-axis, gain.y is the amplification factor on the Y-axis, and offset.y is the side-play amount on the Y-axis, and accuracy value is the second power of the sampling precision figure place of touch-screen and display screen.

On the other hand, provide a kind of locating device of touch point of touch-screen, it is characterized in that, comprising:

Time-obtaining module was used to obtain from the acoustic signals of touch point time of arrival at three different check points of touch-screen;

The position acquisition module is used for the position according to described time of arrival and described check point, obtains described touch point position.

The locating device of the touch point of described touch-screen also comprises:

Calibration module is used for according to default calibration equation described touch point position being calibrated.

The locating device of the touch point of described touch-screen also comprises:

The frequency judge module is used for the frequency according to described three detected acoustic signals of different check points, judges that whether described acoustic signals is from same touch point.

The locating device of the touch point of described touch-screen also comprises:

Signal processing module is used for respectively described three acoustic signals being carried out low frequency and strengthens and the energy processing and amplifying, generates the acoustic signals after handling;

The signal judge module, whether the frequency energy that is used for the described acoustic signals after the judgment processing is all greater than predetermined signal threshold; When judged result when being, start described position acquisition module; Otherwise, withdraw from treatment scheme.

Described position acquisition module comprises:

Coordinate system is set submodule, is used for setting a two-dimensional coordinate system on the plane at touch-screen place;

First calculating sub module, be used to calculate described acoustic signals the time of arrival of first check point Ta and described acoustic signals the very first time difference Δ T1 between the time of arrival of second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming Δ T2 between the time of arrival of second check point Tb;

Second calculating sub module is used for calculating described touch point position according to the predetermined party formula;

Described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}|=\mathrm{\&Delta;T}2*V$

Wherein, V is the velocity of propagation of sound wave, D` <sub>x</sub>And D` _yBe respectively the horizontal ordinate and the ordinate of position, touch point; A _yAnd A _xBe respectively the horizontal ordinate and the ordinate of first check point; B _xAnd B _yBe respectively the horizontal ordinate and the ordinate of second check point; C _xAnd C _yBe respectively the horizontal ordinate and the ordinate of the 3rd check point.

On the other hand, provide a kind of terminal, comprising:

Time-obtaining module was used to obtain from the acoustic signals of touch point time of arrival at three different check points of touch-screen;

The position acquisition module is used for the position according to described time of arrival and described check point, obtains described touch point position.

Embodiments of the invention have following beneficial effect:

In the such scheme, obtain from the acoustic signals of a touch point time of arrival at least three different check points of touch-screen; According to the position of described time of arrival and described check point, obtain described touch point position.Come touch point position is positioned by sound wave, in prior art, pass through capacitive touch screen, strong to the adaptability of environment.

Description of drawings

Fig. 1 is the schematic flow sheet of an embodiment of localization method of the touch point of touch-screen of the present invention;

Fig. 2 is the schematic flow sheet of another embodiment of localization method of the touch point of touch-screen of the present invention;

Fig. 3 is the structural representation of locating device of the touch point of touch-screen of the present invention;

Fig. 4 is the touch point on the touch screen body of the present invention and the synoptic diagram of check point.

Embodiment

For technical matters, technical scheme and advantage that embodiments of the invention will be solved is clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.

As shown in Figure 1, the embodiment for the localization method of the touch point of a kind of touch-screen of the present invention comprises:

Step 11 was obtained from the acoustic signals of touch point time of arrival at least three different check points of touch-screen;

Step 12 according to the position of described time of arrival and described check point, is obtained described touch point position.

Optionally, the localization method of the touch point of described touch-screen also comprises:

Step 13 according to default calibration equation, is calibrated described touch point position.

In the such scheme, obtain from the acoustic signals of a touch point time of arrival at least three different check points of touch-screen; According to the position of described time of arrival and described check point, obtain described touch point position.Come touch point position is positioned by sound wave, in prior art, pass through capacitive touch screen, strong to the adaptability of environment.

As shown in Figure 2, another embodiment for the localization method of the touch point of a kind of touch-screen of the present invention comprises:

Step 21 according to the frequency of described three detected acoustic signals of different check points, judges that whether described acoustic signals is from same touch point.

Step 22 was obtained from the acoustic signals of touch point time of arrival at three different check points of touch-screen;

Step 23 is carried out low frequency to described acoustic signals respectively and is strengthened and the energy processing and amplifying, generates the acoustic signals after handling;

Step 24, whether the frequency energy of the described acoustic signals after the judgment processing is all greater than predetermined threshold; If judged result then abandons described acoustic signals for not.If judged result is for being then to carry out next step.

Step 25 according to the position of described time of arrival and described check point, is obtained described touch point position.

Step 26 according to default calibration equation, is calibrated described touch point position.

Described default calibration equation is:

D _x=(D` _x+ offset.x) * gain.x/ accuracy value;

Dy=(D` _y+ offset.y) * gain.y/ accuracy value;

Wherein, D` <sub>x</sub>And D` _yBe the coordinate figure of position, touch point, D _xAnd D _yCoordinate figure for the position, touch point after the calibration, gain.x is the amplification factor on the X-axis, and offset.x is the side-play amount on the X-axis, and gain.y is the amplification factor on the Y-axis, offset.y is the side-play amount on the Y-axis, and accuracy value is the second power of precision figure place of the sampling precision of touch-screen and display screen.

Described step 25 comprises:

Step 251 is set a two-dimensional coordinate system on the plane at touch-screen place;

Step 252, calculate described acoustic signals the time of arrival of first check point Ta and described acoustic signals the difference Δ T1 of the very first time between the time of arrival of second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming Δ T2 between the time of arrival of second check point Tb;

Step 253 according to the predetermined party formula, calculates described touch point position; Described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}|=\mathrm{\&Delta;T}2*V$

Wherein, V is the velocity of propagation of sound wave, D` <sub>x</sub>And D` _yBe respectively the horizontal ordinate and the ordinate of position, touch point; A _yAnd A _xBe respectively the horizontal ordinate and the ordinate of first check point; B _xAnd B _yBe respectively the horizontal ordinate and the ordinate of second check point; C _xAnd C _yBe respectively the horizontal ordinate and the ordinate of the 3rd check point.

As shown in Figure 3, the locating device for the touch point of a kind of touch-screen of the present invention comprises:

Time-obtaining module 31 was used to obtain from the acoustic signals of touch point time of arrival at three different check points of touch-screen;

Position acquisition module 32 is used for the position according to described time of arrival and described check point, obtains described touch point position.

The locating device of the touch point of described touch-screen also comprises:

Calibration module 33 is used for according to default calibration equation described touch point position being calibrated.

The locating device of the touch point of described touch-screen also comprises:

Frequency judge module 34 is used for the frequency according to described three detected acoustic signals of different check points, judges that whether described acoustic signals is from same touch point.

The locating device of the touch point of described touch-screen also comprises:

Signal processing module 35 is used for respectively described three acoustic signals being carried out low frequency and strengthens and the energy processing and amplifying, generates the acoustic signals after handling;

Signal judge module 36, whether the frequency energy that is used for the described acoustic signals after the judgment processing is all greater than predetermined signal threshold; When judged result when being, start described position acquisition module; Otherwise, withdraw from treatment scheme.

Described position acquisition module 32 comprises:

Coordinate system is set submodule, is used for setting a two-dimensional coordinate system on the plane at touch-screen place;

First calculating sub module, be used to calculate described acoustic signals the time of arrival of first check point Ta and described acoustic signals the very first time difference Δ T1 between the time of arrival of second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming Δ T2 between the time of arrival of second check point Tb;

Second calculating sub module is used for calculating described touch point position according to the predetermined party formula;

Described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}|=\mathrm{\&Delta;T}2*V$

Wherein, V is the velocity of propagation of sound wave, D` <sub>x</sub>And D` _yBe respectively the horizontal ordinate and the ordinate of position, touch point; A _yAnd A _xBe respectively the horizontal ordinate and the ordinate of first check point; B _xAnd B _yBe respectively the horizontal ordinate and the ordinate of second check point; C _xAnd C _yBe respectively the horizontal ordinate and the ordinate of the 3rd check point.

The invention provides a kind of localization method and device of touch point of the touch-screen based on sound wave.With touching acoustic signals that body produces at touch-screen as signal source, poor by calculating acoustic signals at the time of reception of three check points, calculate the range difference of three check points of signal source distance, thereby calculate the coordinate position of signal source (being the touch point).

In the subsequent treatment, after the CPU of terminal gets access to the coordinate data of touch point, judge menu or other operation intentions of click place coordinate position representative, carry out corresponding operation response, and response results is shown.

The application scenarios of localization method of the touch point of the touch-screen based on sonic detection of the present invention is below described.At first set a two-dimensional coordinate system on the plane at touch-screen place.As shown in Figure 4, be the synoptic diagram of touch point on the touch screen body of the present invention and check point.The coordinate of touch point be D` (x, y), the coordinate of the check point of three diverse locations be respectively A (x, y), B (x, y), C (x, y) (three point coordinate values are known).The position difference of described three check points.

Step 1, the user clicks certain position (this position is called the touch point) of touch screen body, makes touch screen body produce vibration, produces an acoustic vibration signal, and the acoustic vibration signal of generation is propagated in touch screen body.Touch screen body is the carrier that acoustic signals is propagated.

Step 2, three check point A (x, y), B (x, y), (x y) detects acoustic signals to C.

Step 3, the frequency energy of detection acoustic vibration signal.

Step 4 is carried out low frequency to acoustic signals and is strengthened energy amplification, processing such as denoising, energy frequency inverted.

Step 5 after acoustic signals adjustment correction, is judged features such as its energy.If energy is lower than thresholding Q _Min, then abandon this invalid signals, otherwise proceed next step.When the user contacts touch-screen gently or detect scene such as voice signal, then because signal energy is low excessively, end process.When the user normally clicked touch-screen, then acoustic signals was effective, continued next step.

Step 6 is measured acoustic vibration signal in the frequency (Fa, Fb, Fc) of three check points, in the time of arrival of three check points (Ta, Tb, Tc).When frequency is consistent, then be defined as acoustic vibration signal from same touch point.Wherein, Fa is the frequency of acoustic vibration signal at first check point; Fb is the frequency of acoustic vibration signal at second check point; Fc is the frequency of acoustic vibration signal at the 3rd check point.Ta is the time of arrival of acoustic vibration signal at first check point; Tb is the time of arrival of acoustic vibration signal at second check point; Tc is the time of arrival of acoustic vibration signal at the 3rd check point.It will be understood by those skilled in the art that first check point can be the A point, also can be B point or C point.Second check point can be the B point, also can be A point or C point.The 3rd check point can be the C point, also can be A point or B point.

Step 7, computing time is poor.

| Ta-Tb|=Δ T1 (formula 1)

| Tc-Tb|=Δ T2 (formula 2)

Step 8 is calculated the coordinate figure of touch point by following equation.

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}|=\mathrm{\&Delta;T}2*V$

That is to say, in formula 1, formula 2, formula 5, formula 6, formula 7 difference substitution formula 3, formula 4.

Formula 3 and 4 is that computed range is poor.

| L _C-L _A|=Δ T1*V (formula 3)

| L _C-L _B|=Δ T2*V (formula 4)

Wherein, V is an acoustic velocity, L _A, L _B, L _CBe respectively A (x, y), B (x, y), (x is y) to touch point D` (x, y) distance for C.

$\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}=L_C$ (formula 5)

$\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}=L_B$ (formula 6)

$\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}=L_A$ (formula 7)

Step 9, (x y) calibrates terminal to D`.

Step 10, (x, menu that coordinate figure y) is represented on current page or operation intention respond processing to the D` after the terminal judges calibration accordingly, show according to response results.

In above-mentioned application scenarios, the resolution (IC that depends on LCD) of resolution of touch screen body (precision that depends on detection sub-module) and LCD may be inconsistent, and the origin of touch screen body and the origin of LCD also may be inconsistent.Therefore, the coordinate figure of the touch-screen of the touch point that calculates need be converted into the coordinate figure of LCD display matrix.In addition, the error between touch-screen and the LCD also can have influence on the precision of coordinate figure, for example: machine error (there is skew etc. the position between touch-screen and the LCD), the amplification factor of Conversion of energy or operator's maloperation etc.Calibration process is for transforming coordinate figure, with error minimize.

First kind of situation is:, set a two-dimensional coordinate system on the plane at touch-screen place; Set a two-dimensional coordinate system on the plane at display screen place, and the true origin of described touch-screen and LCD consistent (for example, all being that the upper left corner is true origin), the sampling precision of touch-screen and LCD all is 10, promptly 2 ¹⁰=1024.

Calibration equation is:

D _x=(D` _x+ offset.x) * gain.x/ accuracy value

D _y=(D` _y+ offset.y) * gain.y/ accuracy value

Wherein, D` <sub>x</sub>And D` _yBe the coordinate figure of touch point on touch-screen, D _xAnd D _yBe the coordinate figure of touch point on LCD after the calibration, gain.x is the amplification factor on the X-axis, and offset.x is the side-play amount on the X-axis, and gain.y is the amplification factor on the Y-axis, and offset.y is the side-play amount on the Y-axis.Should be with in the scene, the sampling precision of touch-screen and LCD is 10, therefore, accuracy value is 1024, just 2 ¹⁰

The generative process of calibration equation is as follows, comprising:

Step 1, (Ax Ay), for example is A (20,20) to send A point coordinate value for the display module of locating device;

Step 2, display module show A (20,20) point on the LCD display matrix.If because machine error causes touch screen body and LCD that skew is arranged, in fact the position of A point on touch screen body seen of user become the A` point.When clicking A`, the coordinate data that passes to the position acquisition module should be (20,20), therefore needs by calibration, and the position correction that A` is ordered is coordinate figure A (20,20).

Step 3, the user clicks the A` point.

Step 4, by equation 21 and 22, calculate coordinate figure A` coordinate (A`x, A`y).For example, the formula that A` (125,150) is calibrated to A (20,20) is:

A _x=(A` _x+ offset.x) * gain.x/1024 formula (10)

A _y=(A` _y+ offset.y) * gain.y/1024 formula (11)

Substitution formula 10 and formula 11 are specially:

20=(125+offset.x) * gain.x/1024 (formula 13)

20=(150+offset.y) * gain.y/1024 (formula 14)

Step 5, display module show B (80,150) point on the LCD display matrix.The position of B point on touch screen body that the user sees become the B` point.

Step 6, the user clicks the B` point.

Step 7, locating device calculate coordinate figure B` (B`x, coordinate B`y).For example, the formula that B` (505,1138) is calibrated to B (80,150) is:

80=(505+offset.x) * gain.x/1024 (formula 15)

150=(1138+offset.y) * gain.y/1024 (formula 16)

Step 8 can be calculated by the formula (formula 13 and formula 15) of two x axles:

gain.x＝161；offset.x＝2

Formula (formula 14 and formula 16) by two y axles can calculate:

gain.y＝134.7，offset.y＝2。

So can draw calibration equation:

D _x＝(D` _x+offset.x)*gain.x/1024

D _y＝(D` _y+offset.y)*gain.y/1024

Wherein, D` (D` _x, D` _y) being the coordinate that the user calculates after clicking on the touch screen body, (Dx Dy) is the displaing coordinate that the LCD after the calibration shows to D.

That is: D _x=(D` _x+ 2) * 161/1024

D _y＝(D` _y+2)*134.7/1024

The proof procedure of calibration equation is below described.Be specially: after the user clicked C`, detection module was scaled coordinate figure above the LCD to the C` coordinate that receives by calibration equation, then with the C point coordinate relatively, calibration equation is verified.Concrete steps comprise as follows:

Step 1, display module on the LCD display matrix C ₁(50,80) point shows.The C that the user sees ₁The position of point on touch screen body become the C` point.

Step 2, the user clicks the C` point.

Step 3, detection module calculate coordinate figure C` (C`x, coordinate C`y), for example C` (310,600).The substitution calibration equation removes to calculate the coordinate that LCD goes up C:

C _x＝(C`x+2)*161/1024

C _y＝(C`y+2)*134.7/1024

C _x＝(310+2)*161/1024

C _y＝(600+2)*134.7/1024

Calculate: C _2x=49.05; C _2y=79.2.

Step 4 is with C ₂(49.05,79.2) and C (50,80) compare, and error is in 1 resolution, so think that calibration equation is satisfactory.

Second kind of situation: the resolution of supposing the resolution of LCD and touch screen body is inconsistent, and the true origin of LCD and the true origin of touch screen body are inconsistent.For example, the true origin of LCD is in the lower right corner, and resolution is 96*128; The true origin of touch screen body is in the upper left corner, and resolution is 800*1000, and sampling precision all is 10, and promptly 2 ¹⁰=1024.Can similarly release formula:

D _x＝96-(D` _x+2)*161/1024

D _y＝128-(D` _y+2)*134.7/1024

Calibration Method and corresponding formulas have a variety of, and above-mentioned is one of them example.

Calibration process below is described.If the touch point that calculates is respectively D`x, D`y at the transverse axis and the coordinate figure on the longitudinal axis of display screen.

Adopt above-mentioned calibration equation, calculate Dx and Dy.

D _x＝(D` _x+2)*161/1024

D _y＝(D` _y+2)*134.7/1024。

On the other hand, the invention provides a kind of terminal, comprising:

Time-obtaining module was used to obtain from the acoustic signals of touch point time of arrival at least three different check points of touch-screen;

The position acquisition module is used for the position according to described time of arrival and described check point, obtains described touch point position.

Described terminal can be multimedia interactive device, mobile phone, PDA (personal digital assistant), panel computer etc.

The present invention measures by sonic transmissions, compares with existing touch-screen, and simple in structure, low in energy consumption, cost is low, and light transmission is good, does not influence imaging, and accommodative ability of environment is strong.Not disturbed by extraneous light.

It will be understood by those skilled in the art that the invention is not restricted to check point is three, can make that the position of determining, touch point is more accurate for greater than three.

Described method embodiment is corresponding with described device embodiment, the description of relevant portion gets final product among the part comparable device embodiment that does not describe in detail in method embodiment, and the description of relevant portion gets final product among the part reference method embodiment that does not describe in detail in device embodiment.

One of ordinary skill in the art will appreciate that, realize that all or part of step in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, this program is when carrying out, comprise step as above-mentioned method embodiment, described storage medium, as: magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.

In each method embodiment of the present invention; the sequence number of described each step can not be used to limit the sequencing of each step; for those of ordinary skills, under the prerequisite of not paying creative work, the priority of each step is changed also within protection scope of the present invention.

The above is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (12)

1. the localization method of the touch point of a touch-screen is characterized in that, comprising:

Step 1 was obtained from the acoustic signals of touch point time of arrival at three different check points of touch-screen;

Step 2 according to the position of described time of arrival and described check point, is obtained described touch point position.

2. the localization method of the touch point of touch-screen according to claim 1 is characterized in that, before the described step 1, also comprises:

According to the frequency of described three detected acoustic signals of different check points, judge that whether described acoustic signals is from same touch point.

3. the localization method of the touch point of touch-screen according to claim 1 is characterized in that, after the described step 2, described method also comprises:

According to default calibration equation, described touch point position is calibrated.

4. the localization method of the touch point of touch-screen according to claim 1 is characterized in that, before the described step 2, also comprises:

Respectively described acoustic signals is carried out low frequency and strengthen and the energy processing and amplifying, generate the acoustic signals after handling;

Whether the frequency energy of the described acoustic signals after the judgment processing is all greater than predetermined threshold;

If judged result then abandons described acoustic signals for not.

5. according to the localization method of the touch point of each described touch-screen of claim 1 to 4, it is characterized in that described step 2 comprises:

A two-dimensional coordinate system is set on plane at the touch-screen place;

Calculate described acoustic signals the time of arrival of first check point Ta and described acoustic signals the difference Δ T1 of the very first time between the time of arrival of second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming Δ T2 between the time of arrival of second check point Tb;

According to the predetermined party formula, calculate described touch point position;

Described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}|=\mathrm{\&Delta;T}2*V$

Wherein, V is the velocity of propagation of sound wave, D` <sub>x</sub>And D` _yBe respectively the horizontal ordinate and the ordinate of position, touch point; A _yAnd A _xBe respectively the horizontal ordinate and the ordinate of first check point; B _xAnd B _yBe respectively the horizontal ordinate and the ordinate of second check point; C _xAnd C _yBe respectively the horizontal ordinate and the ordinate of the 3rd check point.

6. the localization method of the touch point of touch-screen according to claim 2 is characterized in that, described calibration equation is:

D _x=(D` _x+ offset.x) * gain.x/ accuracy value

D _y=(D` _y+ offset.y) * gain.y/ accuracy value

Wherein, D` <sub>x</sub>And D` _yBe the coordinate figure of position, touch point, D _xAnd D _yCoordinate figure for the position, touch point after the calibration, gain.x is the amplification factor on the X-axis, and offset.x is the side-play amount on the X-axis, and gain.y is the amplification factor on the Y-axis, offset.y is the side-play amount on the Y-axis, and accuracy value is the second power of the sampling precision figure place of touch-screen and display screen.

7. the locating device of the touch point of a touch-screen is characterized in that, comprising:

Time-obtaining module was used to obtain from the acoustic signals of touch point time of arrival at three different check points of touch-screen;

The position acquisition module is used for the position according to described time of arrival and described check point, obtains described touch point position.

8. the locating device of the touch point of touch-screen according to claim 7 is characterized in that, also comprises:

Calibration module is used for according to default calibration equation described touch point position being calibrated.

9. the locating device of the touch point of touch-screen according to claim 7 is characterized in that, also comprises:

The frequency judge module is used for the frequency according to described three detected acoustic signals of different check points, judges that whether described acoustic signals is from same touch point.

10. the locating device of the touch point of touch-screen according to claim 7 is characterized in that, also comprises:

Signal processing module is used for respectively described three acoustic signals being carried out low frequency and strengthens and the energy processing and amplifying, generates the acoustic signals after handling;

The signal judge module, whether the frequency energy that is used for the described acoustic signals after the judgment processing is all greater than predetermined signal threshold; When judged result when being, start described position acquisition module; Otherwise, withdraw from treatment scheme.

11. the locating device according to the touch point of each described touch-screen of claim 7 to 10 is characterized in that described position acquisition module comprises:

Coordinate system is set submodule, is used for setting a two-dimensional coordinate system on the plane at touch-screen place;

First calculating sub module, be used to calculate described acoustic signals the time of arrival of first check point Ta and described acoustic signals the very first time difference Δ T1 between the time of arrival of second check point Tb and described acoustic signals the time of arrival of the 3rd check point Tc and described acoustic signals at the second mistiming Δ T2 between the time of arrival of second check point Tb;

Second calculating sub module is used for calculating described touch point position according to the predetermined party formula;

Described predetermined party formula is:

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-A_x)}^2+{({D`}_y-A_y)}^2}|=\mathrm{\&Delta;T}1*V$

$|\sqrt{{({D`}_x-C_x)}^2+{({D`}_y-C_y)}^2}-\sqrt{{({D`}_x-B_x)}^2+{({D`}_y-B_y)}^2}|=\mathrm{\&Delta;T}2*V$

Wherein, V is the velocity of propagation of sound wave, D` <sub>x</sub>And D` _yBe respectively the horizontal ordinate and the ordinate of position, touch point; A _yAnd A _xBe respectively the horizontal ordinate and the ordinate of first check point; B _xAnd B _yBe respectively the horizontal ordinate and the ordinate of second check point; C _xAnd C _yBe respectively the horizontal ordinate and the ordinate of the 3rd check point.

12. a terminal is characterized in that, comprising:

Time-obtaining module was used to obtain from the acoustic signals of touch point time of arrival at three different check points of touch-screen;

The position acquisition module is used for the position according to described time of arrival and described check point, obtains described touch point position.

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