CN116974401A - LCD inductance touch screen interference signal data processing method - Google Patents
LCD inductance touch screen interference signal data processing method Download PDFInfo
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Abstract
The invention relates to the technical field of data processing, in particular to a data processing method for interference signals of an LCD (liquid crystal display) inductive touch screen. The method comprises the following steps: acquiring an excitation voltage signal; processing a plurality of sub-signal segments by segmentation of the excitation voltage, and calculating the noise adding density of each sub-signal segment; further, the noise adding number of each sub-signal segment; acquiring a plurality of noise adding functions, acquiring a plurality of position integer sequences of each sub-signal segment for controlling the noise adding position, and further adding noise to each sub-signal segment to obtain a plurality of excitation voltage signals with noise; setting a noise adding control function, and obtaining an optimal noise excitation voltage signal according to the noise adding control function and the noise excitation voltage signal; the interference signals of the optimal excitation voltage signals with noise are removed to obtain real excitation voltage signals, so that the resolution precision of the excitation voltage signals is improved by accurately adding noise, and further, the interference signals are accurately removed.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a data processing method for interference signals of an LCD (liquid crystal display) inductive touch screen.
Background
An LCD inductive touch screen is a display device that combines LCD display technology and touch screen technology. Touch screen technology allows users to interoperate by directly touching the screen without the use of a mouse or keyboard. Common touch screen technologies include capacitive touch, resistive touch, and surface acoustic wave touch, among others. The multi-point touch control can be realized, namely, a plurality of touch points are identified and responded simultaneously, and multi-finger gesture operation such as zooming in and out, rotation and the like is supported. The method is widely applied to the fields of commercial display, billboards, transportation, medical equipment, educational institutions, self-service equipment and the like.
The excitation voltage signal of the LCD inductive touch screen is easily interfered by other things, such as electromagnetic interference, electrostatic interference, external object contact, poor ground contact and the like, so that a large amount of noise signals are generated in the signal, and the touch positioning is inaccurate. Generally, in order to reduce the influence caused by interference, measures such as reasonably designing and arranging a touch screen system, optimizing ground connection, using anti-interference materials, adding a filter and the like are taken, so that the anti-interference capability of the touch screen is improved. However, touch screens are applied in various places, and these measures can only be used for preventing the generation of interference, and the aim of really suppressing external interference is to improve the self-adaptive performance of a preprocessing system facing various complex interferences.
Disclosure of Invention
In order to solve the technical problem of inaccurate touch screen positioning caused by other interferences, the invention provides a data processing method for interference signals of an LCD inductance touch screen, which adopts the following technical scheme:
acquiring an excitation voltage signal of an LCD inductance touch screen;
obtaining a plurality of extreme point pairs according to the excitation voltage signals, obtaining a segmentation point judgment value of each extreme point pair according to the variation difference condition of the maximum value and the minimum value of the extreme point pairs, obtaining a plurality of segmentation points according to the segmentation point judgment value, obtaining a plurality of sub-signal segments according to the segmentation processing of the excitation voltage signals by the segmentation points, and calculating the noise adding density of each sub-signal segment according to the condition that each sub-signal segment contains detail information and the length of each sub-signal segment; obtaining the noise adding number of each sub-signal segment according to the noise adding density;
obtaining a plurality of noise adding functions under different variances, obtaining integer sequences of each sub-signal segment under a plurality of noise adding methods according to the number of noise adding of each sub-signal segment, and adding noise to each sub-signal segment according to the integer sequences of each noise adding method of each sub-signal segment and the noise adding functions under each variance to obtain noise-carrying excitation voltage signals under each variance and each noise adding method and noise-carrying sub-signal segments of each sub-signal segment under each variance and each noise adding method; setting a noise adding control function according to each variance and the noisy excitation voltage signal under each noisy method and the noisy sub-signal segment of each sub-signal segment under each variance and each noisy method, and judging the noise adding condition of each noisy excitation voltage signal by using the noise adding control function to obtain an optimal noisy excitation voltage signal;
and removing the interference signal of the optimal noisy excitation voltage signal to obtain a real excitation voltage signal.
Preferably, the obtaining a plurality of extreme point pairs according to the excitation voltage signal includes the specific method that:
all extreme points of the excitation voltage signal are acquired, and from the first extreme point, two adjacent extreme points are taken as one extreme point pair, so that all extreme point pairs are acquired.
Preferably, the method for obtaining the segmentation point determination value of each extreme point pair according to the variation difference between the maximum value and the minimum value of the extreme point pair, and obtaining a plurality of segmentation points according to the segmentation point determination value comprises the following specific steps:
the extreme point on the left side of the two extreme points of the extreme point pair is marked as the extreme point on the left side of each extreme point pair, and the extreme point on the right side of the two extreme points of the extreme point pair is marked as the extreme point on the right side;
the first data of the excitation voltage signal is marked as a segmentation point A2, and each extreme point pair between the right extreme point of the 2 nd extreme point pair and the segmentation point A2 is marked as a reference extreme point pair of the 2 nd extreme point pair; obtaining a segmentation point judgment value of the 2 nd extreme point pair according to the reference extreme point pair of the 2 nd extreme point pair; according to the segmentation point judgment value of the 2 nd extreme point pair, a plurality of segmentation points are obtained;
the nearest segmentation point before the left extreme point of the 3 rd extreme point pair is acquired and is marked as a segmentation point A3, and each extreme point pair between the right extreme point of the 3 rd extreme point pair and the segmentation point A3 is marked as a reference extreme point pair of the 3 rd extreme point pair; obtaining a segmentation point judgment value of the 3 rd extreme point pair according to the reference extreme point pair of the 3 rd extreme point pair; according to the segmentation point judgment value of the 3 rd extreme point pair, a plurality of segmentation points are obtained;
and by analogy, the nearest segmentation point before the left extreme point of the v extreme point pair is acquired and is marked as segmentation point Av, and each extreme point pair between the right extreme point of the v extreme point pair and the segmentation point Av is marked as a reference extreme point pair of the v extreme point pair; obtaining a segmentation point judgment value of the v extreme point pair according to the reference extreme point pair of the v extreme point pair; according to the segmentation point judgment value of the v extreme point pair, a plurality of segmentation points are obtained;
and (5) until all the extreme point pairs are traversed, obtaining all the segmentation points.
Preferably, the method for obtaining the segmentation point decision value of the v extreme point pair according to the reference extreme point pair of the v extreme point pair includes the following specific steps:
wherein ,represents the maximum value of the kth reference extreme point pair of the kth extreme point pair,represents the maximum value of the kth-1 reference extremum point pair of the nth extremum point pair,representing the minimum value of the kth reference extreme point pair of the kth extreme point pair,represents the minimum value of the kth-1 reference extremum point pair of the nth extremum point pair,represents the v thThe number of reference extremum point pairs of extremum point pairs,represents the maximum value of all maximum value points of the excitation voltage signal,representing the minimum of all minima points of the excitation voltage signal,a segmentation point determination value representing the v-th extremum point pair.
Preferably, the method for determining the segmentation points according to the v extreme point pair includes the following specific steps:
comparing the segmentation point judgment value of the extreme point pair with 0, and taking the right extreme point of the extreme point pair as the segmentation point when the segmentation point judgment value of the extreme point pair is smaller than or equal to 0.
Preferably, the noise adding density of each sub-signal segment is calculated according to the situation that the detail information is contained in each sub-signal segment and the length of each sub-signal segment; the method for obtaining the noise adding number of each sub-signal segment according to the noise adding density comprises the following specific steps:
the method for obtaining the noise adding density of each sub-signal segment according to the number and the length of the zero point of each sub-signal segment comprises the following steps:
wherein ,indicating the number of zeros of the i-th sub-signal segment,representing the length of the i-th sub-signal segment,representation ofThe length maximum in all sub-signal segments,representing the noise addition density of the ith sub-signal segment;
the noise adding density of each sub-signal segment is multiplied by the length to obtain the noise adding number of each sub-signal segment.
Preferably, the method for obtaining the plurality of noise adding functions under different variances includes the following specific steps:
the noise adding function is a random number generating function obeying Gaussian distribution, the mean value of the noise adding function is always 0, the variance of the noise adding function is valued from 0.1, 0.1 is taken as a valued interval, and the variances are sequentially valued at different values to obtain a plurality of noise adding functions under different variances.
Preferably, the integer sequence of each sub-signal segment under a plurality of noise adding methods is obtained according to the noise adding number of each sub-signal segment, and the specific method comprises the following steps:
for the ith sub-signal segment, generating by a random number generatorPosition integer between them, generatePosition integers, arranging the position integers according to a random number generation sequence to obtain a position integer sequence, randomly generating a plurality of integer sequences under a plurality of noise adding methods by using each position integer sequence as an integer sequence under each noise adding method,representing the number of noise additions of the ith sub-signal segment;
a plurality of integer sequences under a plurality of noise adding methods for each sub-signal segment are obtained.
Preferably, the adding noise processing to each sub-signal segment according to the integer sequence under each noise adding method and the noise adding function under each variance of each sub-signal segment to obtain the noise excitation voltage signal under each variance and each noise adding method and the noise sub-signal segment of each sub-signal segment under each variance and each noise adding method includes the following specific methods:
for the ith sub-signal segment, generating with noise addition function under each varianceThe noise random numbers are arranged according to the generation sequence to obtain a noise random number sequence, each position integer in the integer sequence under each noise adding method corresponds to the noise random number at the same position in the noise random number sequence, and the data at the position integers in each noise random number and the corresponding position integer are accumulated in the sub-signal section to realize the noise adding processing of the data at the position integers in the sub-signal section; the noise adding processing at all the position integers is completed to obtain the sub-signal segment with noise under each variance and each noise adding method,representing the number of noise additions of the ith sub-signal segment;
acquiring a noisy sub-signal segment of each sub-signal segment under each variance and each noise adding method;
each variance of all sub-signal segments and the sub-signal segment with noise under each noise adding method form a excitation voltage signal with noise under each variance and each noise adding method.
Preferably, the noise adding control function is set according to the noise excitation voltage signal with noise under each variance and each noise adding method and the noise sub-signal segment of each sub-signal segment under each variance and each noise adding method, and the noise adding condition of each noise excitation voltage signal is judged by using the noise adding control function to obtain the optimal noise excitation voltage signal, including the specific methods as follows:
wherein ,representing the ith sub-signal segmentThe variance values of all data in the noisy sub-signal segment under each variance and each noisy approach,representing variance values of all data in the noisy excitation voltage signal under each variance and each noise adding method,representing the number of noisy excitation voltage signals containing noisy sub-signal segments under each variance and each noisy method, classifying the data with the same value in the noisy sub-signal segments into one class,representing the number of z-th data in the ith sub-signal segment under each variance and each noise adding method,representing the length of the noisy sub-signal segment for the ith sub-signal segment under each variance and each noise adding method,representing the total class of values of all data in the ith sub-signal segment under each variance and each noise adding method,representing a noise addition control function;
and taking the noise-added excitation voltage signal at the position where the noise adding control function takes the maximum value as an optimal noise-added excitation voltage signal.
The invention has the following beneficial effects:
in order to remove interference signals in an excitation voltage signal, the excitation voltage signal is required to be decomposed, but modal aliasing is easy to occur in the decomposition process, so that noise is required to be added to the excitation voltage signal, the effect of removing the modal aliasing is influenced by the addition position of the added noise and the addition condition of the noise, the modal aliasing degree of a component signal is influenced by the fluctuation condition of an average value envelope curve when the excitation voltage signal is decomposed, the fluctuation condition of the average value envelope curve can be reflected by the difference condition of adjacent maximum value point fluctuation and adjacent minimum value point fluctuation of the excitation voltage signal, and therefore, a plurality of sub-signal segments are obtained by carrying out segmentation processing on the excitation voltage signal according to the difference condition of the adjacent maximum value point fluctuation and the minimum value point fluctuation of the excitation voltage signal. In the excitation voltage decomposition process, the condition of the mean value envelope curve of each sub-signal segment containing details and the fluctuation condition of the mean value envelope curve influence the modal aliasing degree of each sub-signal segment, wherein the larger the modal aliasing degree is, the larger the required noise amount is, and therefore the noise adding number of each sub-signal segment is obtained according to the condition of the mean value envelope curve of the sub-signal segment containing details and the fluctuation condition of the mean value envelope curve. Because the adding position and the noise intensity of the noise can influence the effect of removing modal aliasing, a noise adding control function is set, noise adding processing is carried out on each sub-signal segment according to the noise adding number and the noise adding control function of each sub-signal segment to obtain an optimal excitation voltage signal with noise, and an interference signal in the optimal excitation voltage with noise is removed in a component decomposition mode to obtain a real excitation voltage signal.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions and advantages of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a method for processing interference signal data of an LCD inductive touch screen according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an excitation voltage signal according to an embodiment of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description is given below of a data processing method for interference signals of an LCD inductive touch screen according to the invention, which is specific to the implementation, structure, characteristics and effects thereof, with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" means that the embodiments are not necessarily the same. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
An embodiment of a data processing method for an LCD inductance touch screen interference signal comprises the following steps:
the following specifically describes a specific scheme of the method for processing interference signal data of the LCD inductance touch screen provided by the invention with reference to the accompanying drawings.
Referring to fig. 1, a flowchart of a method for processing interference signal data of an LCD inductive touch screen according to an embodiment of the present invention is shown, where the method includes:
s001: an excitation voltage signal is acquired.
It should be noted that, a series of electrodes, called induction coils or induction units, are provided on the LCD touch screen for detecting the touch excitation signal. When a user touches the screen, the induction coil detects a change in capacitance and converts it into an electrical signal that is related to the touch location. After processing these detection signals, the position coordinates of the touch can be determined.
First, the excitation voltage signal generated when the touch screen is acquired, and a schematic diagram of the excitation voltage signal is shown in fig. 2.
S002: the excitation voltage signal is segmented to obtain a plurality of sub-signal segments, the noise adding density of each sub-signal segment is calculated, and the noise adding number is obtained according to the noise adding density.
It should be noted that, because the excitation voltage signal of the LCD touch screen is easily interfered by other things, there is an interference signal in the excitation voltage signal, the voltage range of the excitation signal is only tens to hundreds of millivolts, which is easily submerged by the interference signal, and the coordinate precision of the touch position analyzed by the submerged excitation voltage signal is low, so that in order to improve the positioning precision of the touch position, the interference signal in the excitation voltage signal needs to be eliminated. For complex interference signals, an EMD algorithm and various variant algorithms thereof are often utilized to decompose component signals, the EMD belongs to parameter-free self-adaptive decomposition, independent component signals cannot be well separated, the problem of modal aliasing is easy to occur, the EEMD algorithm generated on the basis of the EMD is used for solving the problem of modal aliasing by standardizing signals and then adding noise, however, when the added noise intensity and the adding position are improper, a signal section with gentle envelope is easy to occur in the decomposition process, the component signals are generated in the modal decomposition process by repeatedly subtracting the mean envelope, and the mean envelope can contain the difference information of different types of signals in an original signal, only one type of information can be reserved in the component signals obtained by repeatedly subtracting the mean envelope, and when the noise of the original signal is improper, the mean envelope cannot contain the difference information of different types of signals, so that the component sequences obtained by repeatedly subtracting the mean envelope can reserve various types of information, namely the problem of modal aliasing exists. Therefore, noise with correct intensity needs to be added to the correct position of the signal to effectively solve the problem of modal aliasing.
It should be further noted that when the EMD is used to generate the component signal of the excitation voltage signal, when the mean envelope curve of some areas in the excitation voltage signal fluctuates less, the mean envelope curve of the areas cannot contain different types of difference information, so that modal aliasing easily exists in the component signal decomposed at the areas, and when the mean envelope curve of some areas in the excitation voltage signal fluctuates more, the mean envelope curve of the areas contains different types of difference information, so that modal aliasing does not easily exist in the component signal decomposed at the areas, so that the fluctuation of the mean envelope curve of each area is different, and the degree of modal aliasing is different, so that the excitation voltage signal needs to be segmented according to the fluctuation condition of the mean envelope curve.
Specifically, all extreme points of the excitation voltage signal are acquired, one extreme point pair is formed by two adjacent extreme points from the first extreme point, a plurality of extreme point pairs are obtained, and it is to be noted that no extreme point in other extreme point pairs exists in each extreme point pair, for example, the v extreme point pair is formed by the 2v extreme point and 2v+1st extreme point, and the v+1st extreme point pair is formed by 2v+2nd extreme point and 2v+3rd extreme point. Each extreme point pair comprises a maximum point and a minimum point.
The extreme point on the left side of the two extreme points of the extreme point pair is marked as the extreme point on the left side of each extreme point pair, and the extreme point on the right side of the two extreme points of the extreme point pair is marked as the extreme point on the right side;
the first data of the excitation voltage signal is marked as a segmentation point A2, and each extreme point pair between the right extreme point of the 2 nd extreme point pair and the segmentation point A2 is marked as a reference extreme point pair of the 2 nd extreme point pair; obtaining a segmentation point judgment value of the 2 nd extreme point pair according to the reference extreme point pair of the 2 nd extreme point pair, and displaying the segmentation point judgment value in the subsequent process of the specific method; according to the segmentation point judgment value of the 2 nd extreme point pair, a plurality of segmentation points are obtained, and the specific method is displayed in the subsequent process;
the nearest segmentation point before the left extreme point of the 3 rd extreme point pair is acquired and is marked as a segmentation point A3, and each extreme point pair between the right extreme point of the 3 rd extreme point pair and the segmentation point A3 is marked as a reference extreme point pair of the 3 rd extreme point pair; obtaining a segmentation point judgment value of the 3 rd extreme point pair according to the reference extreme point pair of the 3 rd extreme point pair; according to the segmentation point judgment value of the 3 rd extreme point pair, a plurality of segmentation points are obtained;
and by analogy, the nearest segmentation point before the left extreme point of the v extreme point pair is acquired and is marked as segmentation point Av, and each extreme point pair between the right extreme point of the v extreme point pair and the segmentation point Av is marked as a reference extreme point pair of the v extreme point pair; obtaining a segmentation point judgment value of the v extreme point pair according to the reference extreme point pair of the v extreme point pair; according to the segmentation point judgment value of the v extreme point pair, a plurality of segmentation points are obtained; it should be noted that the reference extremum point pair of the v-th extremum point pair includes the v-th extremum point pair and the extremum point pair where the segment point Av is located.
Until all extreme point pairs are traversed, obtaining all segmentation points;
the method for acquiring the segmentation point judgment value of each extreme point pair according to each extreme point pair comprises the following steps:
wherein ,represents the maximum value of the kth reference extreme point pair of the kth extreme point pair,represents the maximum value of the kth-1 reference extremum point pair of the nth extremum point pair,representing the minimum value of the kth reference extreme point pair of the kth extreme point pair,represents the minimum value of the kth-1 reference extremum point pair of the nth extremum point pair,the difference condition of adjacent wave crest variation and adjacent wave trough variation of the excitation signal is reflected, the value is more similar to 1, the difference between the adjacent wave crest variation and the adjacent wave trough variation of the excitation signal is smaller, wherein when the adjacent wave crest variation is similar to the adjacent wave trough variation, the upper envelope fluctuation and the lower envelope fluctuation are mutually counteracted, so that the mean value envelope fluctuation obtained by using the upper envelope and the lower envelope is smaller, the mean value envelope with smaller fluctuation is easy to lose the difference information of various signals, and the decomposed component signals contain various kinds of signal information, namely the modal aliasing phenomenon occurs.Represents the number of v-th extreme point pair reference extreme point pairs,represents the maximum value of all maximum value points of the excitation voltage signal,representing the minimum value of all minimum value points of the excitation voltage signal byTo pair(s)The normalization process is carried out, the processing is carried out,reflecting the cumulative fluctuation of the mean envelope, the larger the value is, the larger the cumulative fluctuation degree of the mean envelope from the last segmentation point to the region between the right extreme points of the v extreme point pair is,a segment point determination value indicating a v-th extreme point pair, by which segment point determination is performed for the v-th extreme point.
According to the segmentation point judgment value of each extreme point pair, a plurality of segmentation points are obtained, and the specific method is as follows:
and comparing the segmentation point judgment value of the extreme point pair with 0, and taking the right extreme point of the extreme point pair as a segmentation point when the segmentation point judgment value of the extreme point pair is smaller than or equal to 0.
Each segment point is used as a dividing point of the excitation voltage signal, and the excitation voltage signal is divided into a plurality of sub-signal segments by the dividing point.
It should be noted that, because the capability of the mean envelope containing various information difference information is related to the modal aliasing degree, the more the mean envelope contains the detail information, the stronger the capability of the mean envelope containing various information difference information is, and the worse the fluctuation condition of the mean envelope is, the weaker the capability of the mean envelope containing various information difference information is, so that the noise adding number of each sub-signal segment is controlled according to the condition that the mean envelope contains the detail information and the fluctuation condition of the mean envelope.
Further, the method for calculating the noise adding density of each sub-signal segment according to the number and the length of the zero point of each sub-signal segment comprises the following steps:
wherein ,the number of zero points of the ith sub-signal segment is represented, the larger the value is, the higher the frequency of the sub-signal segment is, the more details of the mean envelope of the sub-signal segment are, namely, the mean envelope of the sub-signal segment contains more differential information of various signals, so that the sub-signal segment does not need to add excessive noise, and the less the noise adding density of the sub-signal segment is,the length of the ith sub-signal segment is expressed, the larger the value is, the smaller the mean envelope fluctuation of the sub-signal segment is, the less difference information of various signals is contained in the mean envelope of the sub-signal segment, therefore, more noise needs to be added to the sub-signal segment,reflecting the number of zeros of the ith sub-signal segment,representing the maximum value of the length among all sub-signal segments,representing the noise addition density of the ith sub-signal segment.
Further, the noise adding density of each sub-signal segment is multiplied by the length to obtain the number of noise adding of each sub-signal segment.
The noise adding number of each sub-signal segment is obtained, when the noise adding number of each sub-signal segment is obtained, the fluctuation condition of the mean envelope of each area in the excitation voltage signal is considered to be different, the excitation voltage signal is segmented according to the fluctuation condition of the mean envelope to obtain a plurality of sub-signal segments, meanwhile, the noise adding number of the ith sub-signal segment is recorded as the noise adding number of the ith sub-signal segment because the mean envelope of each sub-signal segment contains detailed information and can reflect the capability of the mean envelope to describe various information difference information。
S003: and setting a noise adding control function, and carrying out noise adding regulation and control on each sub-signal segment according to the noise adding control function and the noise adding number to obtain an optimal excitation voltage signal with noise.
It should be noted that, the number of noise added to each sub-signal segment is obtained in the above steps, and the noise adding position and the intensity of the added noise also affect the mode aliasing degree, so that the noise adding position and the intensity of the added noise of each sub-signal segment need to be controlled, so that each sub-signal segment can better add noise.
Specifically, the noise adding function is a random number generating function obeying Gaussian distribution, the value of the variance of the noise adding function can control the noise intensity, so that the mean value of the noise adding function is always 0, the noise intensity is changed by adjusting the value of the variance of the noise adding function, the variance of the noise adding function is valued from 0.1, the variances are valued at 0.1 as valued intervals, and the variances are valued at different values in sequence, so that a plurality of noise adding functions under different variances are obtained.
Further, taking the ith sub-signal segment as an example, the ith sub-signal segment is generated by a random number generatorPosition integer between them, generatePosition integers, wherein each position integer represents the noise adding position of the ith sub-signal segment, the position integers are arranged according to the random number generation sequence to obtain a position integer sequence, each position integer sequence is called an integer sequence under each noise adding method, Q integer sequences under Q noise adding methods are generated,representing the length of the i-th sub-signal segment,the number of noise additions in the ith sub-signal segment is shown, and in this embodiment, Q is 1000, and other embodiments may take other values, and the present embodiment is not particularly limited.
Further, taking the ith sub-signal segment as an example, a noise addition function under each variance is used to generateAnd the noise random numbers are arranged according to the generation sequence to obtain a noise random number sequence, each position integer in the integer sequence under each noise adding method corresponds to the noise random number at the same position in the noise random number sequence, and the data at the position integers in the sub-signal section are accumulated with each noise random number and the data at the corresponding position integers to realize the noise adding processing of the data at the position integers in the sub-signal section. And similarly, finishing the noise adding processing of all the position integers to obtain the sub-signal segment with noise under each variance and each noise adding method.
Acquiring a noisy sub-signal segment of each sub-signal segment under each variance and each noise adding method;
each variance of all sub-signal segments and the sub-signal segment with noise under each noise adding method form a excitation voltage signal with noise under each variance and each noise adding method.
It should be noted that, one variance corresponds to one noise random number sequence, so that a plurality of variances and a plurality of noise adding methods obtain the noise excitation voltage signals under a plurality of variances and under a plurality of noise adding methods, and therefore an evaluation mode is required to be set to select the optimal noise excitation voltage signal.
Further, according to the noise excitation voltage signal with each variance and each noise adding method and the noise sub-signal segment with each sub-signal segment under each variance and each noise adding method, the set noise adding control function is as follows:
wherein ,representing variance values of all data in the i-th sub-signal segment in each variance and noisy sub-signal segment under each noise adding method,representing variance values of all data in the noisy excitation voltage signal under each variance and each noise adding method,the number of noisy sub-signal segments contained in the noisy excitation voltage signal for each variance and each noisy approach is represented,the noise intensity of the noisy excitation voltage signal under each variance and each noise adding method is reflected, and the smaller the value is, the smaller the noise intensity of the noisy excitation voltage signal is, and the phenomenon that the envelope curve is flatter is easy to occur. Thus, the manner of adding noise and the intensity of the added noise need to be changed, so as to ensure that the obtained excitation voltage signal with noise can be decomposed into independent component signals. Data with the same value in the noise signal segment is divided into one class,representing the ith sub-signal segment in noisy sub-signal segments for each variance and each noise adding methodThe number of data of the z-th class,representing the length of the ith sub-signal segment at each variance and noisy sub-signal segment for each noisy version,representing the total class of values of all data of the ith sub-signal segment in each variance and noisy sub-signal segment of each noisy approach,the degree of confusion of all data in the noisy excitation voltage signal of each variance and each noise adding method is reflected, and the larger the value is, the more chaotic the noisy excitation voltage signal is, so that the noise adding effect of the noisy excitation voltage signal is better.Representing a noise addition control function.
It should be noted that, one variance and one noise adding method of the noisy excitation voltage signal obtain one noise adding control function value, and multiple variance and multiple noise adding methods of the noisy excitation voltage signal can obtain multiple noise adding control function values, where the noise adding function takes the best noise adding effect of the noisy excitation voltage signal at the maximum value.
Further, the noise excitation voltage signals under each variance and each noise adding method and the noise sub-signal segments of each sub-signal segment under each variance and each noise adding method are sequentially input into a noise adding function, and the noise adding control function converges through continuous iteration; and when the noise addition control function converges, taking the noise excitation voltage signal at the position where the noise addition control function takes the maximum value as the optimal noise excitation voltage signal.
So far, the optimal noisy excitation voltage signal is obtained, when the optimal noisy excitation voltage signal is obtained, a noise adding control function is set, and the noise adding position and the intensity of added noise are controlled by utilizing the noise adding control function, so that the optimal noisy excitation voltage signal is obtained.
S004: and removing the interference signal in the optimal noisy excitation voltage signal to obtain a real excitation voltage signal.
In addition, according to the idea of ICA independent component analysis, the signal main component must not have gaussian property, and the interference noise has strong Gao Sixing, so that the interference signal in the excitation voltage signal is removed according to the condition that each component signal conforms to gaussian property.
Specifically, the EEMD algorithm is utilized to decompose the optimal noisy excitation voltage signal to obtain a plurality of IMF component signals and a baseline signal. Fitting the Gaussian function of each IMF component signal, performing kurtosis calculation on the Gaussian function of each IMF component signal, and obtaining the Gaussian coincidence degree of each IMF component signal by taking the kurtosis as a judgment standard of the Gaussian, wherein the Gaussian coincidence condition judgment method is the prior art and is not repeated here. And removing the three IMF component signals with the maximum Gaussian coincidence degree, and combining the rest IMF component signals and the baseline signal into a real excitation voltage signal.
In order to remove interference signals in an excitation voltage signal, the excitation voltage signal is required to be decomposed, but modal aliasing is easy to occur in the decomposition process, so that noise is required to be added to the excitation voltage signal, the mode aliasing removing effect is influenced by the adding position of the added noise and the adding condition of the noise, the modal aliasing degree of a component signal is influenced by the fluctuation condition of an average value envelope curve when the excitation voltage signal is decomposed, the fluctuation condition of the average value envelope curve can be reflected by the difference condition of adjacent maximum value point fluctuation and adjacent minimum value point fluctuation of the excitation voltage signal, and therefore, a plurality of sub-signal segments are obtained by carrying out segmentation processing on the excitation voltage signal according to the difference condition of adjacent maximum value point fluctuation and minimum value point fluctuation of the excitation voltage signal. In the excitation voltage decomposition process, the condition of the mean value envelope curve of each sub-signal segment containing details and the fluctuation condition of the mean value envelope curve influence the modal aliasing degree of each sub-signal segment, wherein the larger the modal aliasing degree is, the larger the required noise amount is, and therefore the noise adding number of each sub-signal segment is obtained according to the condition of the mean value envelope curve of the sub-signal segment containing details and the fluctuation condition of the mean value envelope curve. Because the adding position and the noise intensity of the noise can influence the effect of removing modal aliasing, a noise adding control function is set, noise adding processing is carried out on each sub-signal segment according to the noise adding number and the noise adding control function of each sub-signal segment to obtain an optimal excitation voltage signal with noise, and an interference signal in the optimal excitation voltage with noise is removed in a component decomposition mode to obtain a real excitation voltage signal.
It should be noted that: the sequence of the embodiments of the present invention is only for description, and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
Claims (10)
1. An LCD inductive touch screen interference signal data processing method, comprising:
acquiring an excitation voltage signal of an LCD inductance touch screen;
obtaining a plurality of extreme point pairs according to the excitation voltage signals, obtaining a segmentation point judgment value of each extreme point pair according to the variation difference condition of the maximum value and the minimum value of the extreme point pairs, obtaining a plurality of segmentation points according to the segmentation point judgment value, obtaining a plurality of sub-signal segments according to the segmentation processing of the excitation voltage signals by the segmentation points, and calculating the noise adding density of each sub-signal segment according to the condition that each sub-signal segment contains detail information and the length of each sub-signal segment; obtaining the noise adding number of each sub-signal segment according to the noise adding density;
obtaining a plurality of noise adding functions under different variances, obtaining integer sequences of each sub-signal segment under a plurality of noise adding methods according to the number of noise adding of each sub-signal segment, and adding noise to each sub-signal segment according to the integer sequences of each noise adding method of each sub-signal segment and the noise adding functions under each variance to obtain noise-carrying excitation voltage signals under each variance and each noise adding method and noise-carrying sub-signal segments of each sub-signal segment under each variance and each noise adding method; setting a noise adding control function according to each variance and the noisy excitation voltage signal under each noisy method and the noisy sub-signal segment of each sub-signal segment under each variance and each noisy method, and judging the noise adding condition of each noisy excitation voltage signal by using the noise adding control function to obtain an optimal noisy excitation voltage signal;
and removing the interference signal of the optimal noisy excitation voltage signal to obtain a real excitation voltage signal.
2. The method for processing interference signal data of an LCD inductive touch screen according to claim 1, wherein the obtaining a plurality of extreme point pairs according to the excitation voltage signal comprises the following specific steps:
all extreme points of the excitation voltage signal are acquired, and from the first extreme point, two adjacent extreme points are taken as one extreme point pair, so that all extreme point pairs are acquired.
3. The method for processing interference signal data of an LCD inductive touch screen according to claim 1, wherein the step of obtaining a segmentation point determination value of each extremum point pair according to a variation difference between a maximum value and a minimum value of the extremum point pair, and obtaining a plurality of segmentation points according to the segmentation point determination value comprises the following specific steps:
the extreme point on the left side of the two extreme points of the extreme point pair is marked as the extreme point on the left side of each extreme point pair, and the extreme point on the right side of the two extreme points of the extreme point pair is marked as the extreme point on the right side;
the first data of the excitation voltage signal is marked as a segmentation point A2, and each extreme point pair between the right extreme point of the 2 nd extreme point pair and the segmentation point A2 is marked as a reference extreme point pair of the 2 nd extreme point pair; obtaining a segmentation point judgment value of the 2 nd extreme point pair according to the reference extreme point pair of the 2 nd extreme point pair; according to the segmentation point judgment value of the 2 nd extreme point pair, a plurality of segmentation points are obtained;
the nearest segmentation point before the left extreme point of the 3 rd extreme point pair is acquired and is marked as a segmentation point A3, and each extreme point pair between the right extreme point of the 3 rd extreme point pair and the segmentation point A3 is marked as a reference extreme point pair of the 3 rd extreme point pair; obtaining a segmentation point judgment value of the 3 rd extreme point pair according to the reference extreme point pair of the 3 rd extreme point pair; according to the segmentation point judgment value of the 3 rd extreme point pair, a plurality of segmentation points are obtained;
and by analogy, the nearest segmentation point before the left extreme point of the v extreme point pair is acquired and is marked as segmentation point Av, and each extreme point pair between the right extreme point of the v extreme point pair and the segmentation point Av is marked as a reference extreme point pair of the v extreme point pair; obtaining a segmentation point judgment value of the v extreme point pair according to the reference extreme point pair of the v extreme point pair; according to the segmentation point judgment value of the v extreme point pair, a plurality of segmentation points are obtained;
and (5) until all the extreme point pairs are traversed, obtaining all the segmentation points.
4. The method for processing interference signal data of an LCD inductive touch screen according to claim 3, wherein the obtaining the segment point decision value of the v extreme point pair according to the reference extreme point pair of the v extreme point pair comprises the following specific steps:
wherein ,maximum value in the kth reference extremum point pair, representing the nth extremum point pair,/>The (k-1) th reference extremum representing the (v) th extremum point pairMaximum value in dot pair +_>Minimum value in the kth reference extremum point pair, representing the nth extremum point pair,/->Minimum value of the kth-1 th reference extremum point pair representing the nth extremum point pair,/->Representing the number of reference extremum point pairs of the v-th extremum point pair, < >>Represents the maximum value of all maximum value points of the excitation voltage signal, +.>Minimum value of all minimum value points representing the excitation voltage signal, +.>A segmentation point determination value representing the v-th extremum point pair.
5. The method for processing interference signal data of an LCD inductive touch screen according to claim 3, wherein the step of obtaining a plurality of segment points according to the segment point decision value of the v-th extreme point pair comprises the following specific steps:
comparing the segmentation point judgment value of the extreme point pair with 0, and taking the right extreme point of the extreme point pair as the segmentation point when the segmentation point judgment value of the extreme point pair is smaller than or equal to 0.
6. The method for processing interference signal data of an LCD inductive touch screen according to claim 1, wherein the noise adding density of each sub-signal segment is calculated according to the condition that the detail information is contained in each sub-signal segment and the length of each sub-signal segment; the method for obtaining the noise adding number of each sub-signal segment according to the noise adding density comprises the following specific steps:
the method for obtaining the noise adding density of each sub-signal segment according to the number and the length of the zero point of each sub-signal segment comprises the following steps:
wherein ,represents the number of zeros, < +.>Representing the length of the ith sub-signal segment, +.>Representing the maximum value of the length in all sub-signal segments, < >>Representing the noise addition density of the ith sub-signal segment;
the noise adding density of each sub-signal segment is multiplied by the length to obtain the noise adding number of each sub-signal segment.
7. The method for processing interference signal data of an LCD inductive touch screen according to claim 1, wherein the obtaining a plurality of noise adding functions under different variances comprises the following specific steps:
the noise adding function is a random number generating function obeying Gaussian distribution, the mean value of the noise adding function is always 0, the variance of the noise adding function is valued from 0.1, 0.1 is taken as a valued interval, and the variances are sequentially valued at different values to obtain a plurality of noise adding functions under different variances.
8. The method for processing interference signal data of an LCD inductive touch screen according to claim 6, wherein the integer sequence of each sub-signal segment under a plurality of noise adding methods is obtained according to the noise adding number of each sub-signal segment, comprising the following specific steps:
for the ith sub-signal segment, generating by a random number generatorInteger of positions between, generate->Position integers, arranging the position integers according to a random number generation sequence to obtain a position integer sequence, randomly generating a plurality of integer sequences under a plurality of noise adding methods by referring to each position integer sequence as an integer sequence under each noise adding method, and carrying out +_>Representing the number of noise additions of the ith sub-signal segment;
a plurality of integer sequences under a plurality of noise adding methods for each sub-signal segment are obtained.
9. The method for processing interference signal data of an LCD inductive touch screen according to claim 8, wherein the adding noise to each sub-signal segment according to the integer sequence under each noise adding method and the noise adding function under each variance to obtain each variance and the noise excitation voltage signal under each noise adding method and the noise sub-signal segment of each sub-signal segment under each variance and each noise adding method comprises the following specific steps:
for the ith sub-signal segment, generating with noise addition function under each varianceThe noise random numbers are arranged according to the generation sequence to obtain a noise random number sequence, and each position integer in the integer sequence under each noise adding method is combined with the noise random number sequenceCorresponding to the noise random numbers at the same positions in the sub-signal section, and accumulating each noise random number with the data at the corresponding position integer to realize the noise adding processing of the data at the position integer in the sub-signal section; the noise adding processing at all the position integers is completed to obtain the sub-signal segment with noise under each variance and each noise adding method,representing the number of noise additions of the ith sub-signal segment;
acquiring a noisy sub-signal segment of each sub-signal segment under each variance and each noise adding method;
each variance of all sub-signal segments and the sub-signal segment with noise under each noise adding method form a excitation voltage signal with noise under each variance and each noise adding method.
10. The method for processing interference signal data of LCD inductive touch screen according to claim 1, wherein the noise adding control function is set according to each variance and each noise adding method of the noise-added excitation voltage signal and each sub-signal segment, and the noise adding condition of each noise-added excitation voltage signal is judged by using the noise adding control function to obtain the optimal noise-added excitation voltage signal, comprising the following specific steps:
wherein ,representing variance values of all data in the noisy sub-signal segment of the ith sub-signal segment under each variance and each noise adding method +.>Representing all numbers in the noisy excitation voltage signal for each variance and for each noise adding methodVariance value of data>Representing the number of noise-carrying sub-signal segments contained in the noise-carrying excitation voltage signal under each variance and each noise adding method, classifying the data with the same value in the noise-carrying sub-signal segments into one class, and dividing the data into one class>Representing the number of z-th data in the ith sub-signal segment in each variance and each noise adding method>Representing the length of the noisy sub-signal segment of the ith sub-signal segment under each variance and each noise adding method, < ->Representing the total class of values of all data in the noisy sub-signal segment of the ith sub-signal segment under each variance and each noise adding method, +.>Representing a noise addition control function;
and taking the noise-added excitation voltage signal at the position where the noise adding control function takes the maximum value as an optimal noise-added excitation voltage signal.
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