CN118363489B - Capacitive sensing system and signal adjustment method thereof, and capacitive touch screen terminal - Google Patents
Capacitive sensing system and signal adjustment method thereof, and capacitive touch screen terminal Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04186—Touch location disambiguation
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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Abstract
The invention relates to the technical field of capacitance induction, and particularly discloses a capacitance induction system, a signal adjustment method thereof and a capacitance touch screen terminal, wherein the capacitance induction system comprises a signal receiving and analyzing module, a touch point coordinate and a receiving time of a touch signal extracted from a capacitance signal output by an electrode array and a touch signal waveform diagram are determined; the system comprises a time-space distribution characteristic analysis module, a signal smoothing denoising module and a noise-free touch signal processing module, wherein the time-space distribution characteristic analysis module analyzes the latest touch force time-space distribution characteristic in the preset touch short period based on the receiving time and the touch point coordinates of all real-time touch signals received in the preset touch short period and the touch signal waveform diagram, the signal smoothing denoising module performs smoothing denoising on the touch signal waveform diagram of all touch signals in the latest preset touch short period based on the touch force time-space distribution characteristic in the latest preset touch short period to obtain a noise-free touch signal, and the signal smoothing denoising module is used for realizing smoothing denoising on the touch signal waveform diagram of all touch signals based on the touch force time-space distribution characteristic.
Description
Technical Field
The invention relates to the technical field of capacitance sensing, in particular to a capacitance sensing system, a signal adjusting method thereof and a capacitance touch screen terminal.
Background
Currently, capacitive sensing systems of capacitive touch screen terminals are a common sensor technology that can be used to detect the pressure applied by a user on a touch screen or the location of a touch point. A capacitive sensing system in a capacitive touch screen terminal mainly uses the working principle of a capacitive touch sensor (capacitive touch panel) to receive a touch signal of a user. The capacitive touch sensor can realize a multi-touch function based on an electrostatic induction phenomenon when a human body touches the screen. In a capacitive sensing system in a capacitive touch screen terminal, a signal conditioning method mainly comprises the following aspects:
1. the anti-interference technology aims at the problems that a capacitive induction system is easy to suffer from electromagnetic interference, electrostatic interference and the like, and can reduce the influence of external interference on the system performance by adopting the technologies of a shielding shell, a filter, a low noise amplifier and the like in the design stage.
2. Filter design for tiny signals generated by a capacitive sensing system, suitable filters may be selected for signal processing, such as low pass filters for removing high frequency noise, high pass filters for removing baseline noise, and band pass and band reject filters to remove interference at specific frequencies.
3. And the signal adjustment algorithm can adjust the touch signal to a certain extent after receiving the touch signal, such as smoothing the signal amplitude, so that the signal is more stable. Meanwhile, the method can combine the synergistic effect of hardware equipment and a software algorithm to realize more accurate signal processing.
4. And data fusion, namely fusing the data from a plurality of sensors to improve the stability and accuracy of the whole system. For example, multiple capacitive sensing systems may be data fused to form a larger reference area, thereby reducing noise and errors from a single sensor.
5. Automatic calibration, namely, the performance and the precision of the system can be effectively maintained through the periodic self-checking and the automatic calibration of the capacitance induction system. The calibration process may be periodic or may be real-time to accommodate changing application environments.
Although the prior art may signal adjustments from multiple angles to the capacitive sensing system in a capacitive touch screen terminal to improve overall system performance and stability. However, since the capacitive sensing system is sensitive to external factors such as static electricity and electromagnetic interference, false alarm and false action phenomena may be caused, for example, a finger is mistakenly considered to block a screen to trigger a closing function, or other actions are triggered under the condition of no finger touch, and since the capacitive sensing system is sensitive to environmental changes, for example, temperature changes, humidity changes, and the like, instability of a signal adjustment method may cause system performance fluctuation, and influence user experience.
Therefore, the invention provides a capacitance sensing system, a signal adjusting method thereof and a capacitance touch screen terminal.
Disclosure of Invention
The invention provides a capacitance induction system, a signal adjustment method thereof and a capacitance touch screen terminal, which are used for realizing smooth denoising of touch signal waveform diagrams of all touch signals based on touch force time-space distribution characteristics, so that the change of capacitance signals output by the capacitance induction system caused by false touch or false action is greatly reduced, the system performance fluctuation caused by external factors such as static electricity and electromagnetic interference or environmental changes such as temperature change and humidity change is also greatly reduced, and the user experience is improved.
The invention provides a capacitive sensing system, comprising:
the signal receiving and analyzing module is used for receiving all touch signals input by a user in a capacitor touch area in the latest preset touch short period, and determining touch point coordinates and receiving time of each touch signal and a touch signal waveform chart, wherein the touch signals are extracted from the capacitor signals output by each electrode pair in the electrode array;
The time-space distribution characteristic analysis module is used for analyzing the latest time-space distribution characteristic of the touch force in the preset touch short period based on the receiving time and the touch point coordinates of all the real-time touch signals received in the preset touch short period and the touch signal waveform diagram;
And the signal smoothing and denoising module is used for smoothing and denoising the touch signal waveform diagrams of all the touch signals in the latest preset touch short period based on the touch force time-space distribution characteristics in the latest preset touch short period to obtain noiseless touch signals of all the touch signals as a signal adjustment result.
Preferably, the signal receiving and analyzing module includes:
the touch signal receiving sub-module is used for receiving the capacitance signals output by each electrode pair in the electrode array in real time and extracting all touch signals from all capacitance signals output in the latest preset touch short period;
the touch signal analysis submodule is used for determining the touch point coordinates and the receiving time of each touch signal and a touch signal waveform chart;
The electrode array is two groups of metal film electrodes which are parallel to each other, and the electrode array is arranged below a capacitive touch area in the capacitive touch equipment.
Preferably, the touch signal receiving sub-module includes:
The waveform diagram generating unit is used for generating a waveform diagram of the capacitance signal of each electrode pair in the latest preset touch short period based on the capacitance signal output by each electrode pair in the electrode array received in real time;
A touch signal extraction unit, configured to take all the partial capacitive signal waveform segments with abrupt changes in amplitude existing in all the capacitive signal waveform diagrams as all the touch signals input by the user in the capacitive touch area in the latest preset touch short period;
The relevant parameter analysis unit is used for regarding the center coordinates of the electrode pairs corresponding to the capacitance signal waveform diagrams containing the touch signals as touch point coordinates of the corresponding touch signals, regarding the starting time of the corresponding touch signals as the receiving time of the corresponding touch signals, and regarding the forehead capacitance signal waveform sections corresponding to each touch signal as the touch signal waveform diagrams of the corresponding touch signals;
The center coordinates of the electrode pairs are represented by a preset two-dimensional coordinate system on the plane of the capacitive touch area.
Preferably, the space-time distribution feature analysis module includes:
the time cluster analysis sub-module is used for carrying out cluster analysis on the receiving time of all touch signals input by a user in a capacitor touch area in the latest preset touch short period to obtain at least one time cluster;
The touch force application dynamic track generation sub-module is used for taking the time period covered by all the receiving moments in each moment cluster as a single touch action period in the latest preset touch short period, and determining the touch force application dynamic track in the single touch action period corresponding to each moment cluster;
the applied force relative value determining submodule is used for obtaining applied force relative values of the touch signals corresponding to all the receiving moments contained in each moment cluster in a corresponding single touch action period based on the amplitude characteristics of the touch signal waveform diagrams of the touch signals corresponding to all the receiving moments contained in each moment cluster;
The touch force dynamic track generation sub-module is used for carrying out mark combination on the application force relative values of the touch signals corresponding to all the receiving moments contained in each moment cluster and the touch force dynamic track in the corresponding single touch action period to obtain the touch force dynamic track of each moment cluster, and taking the touch force dynamic track of all the moment clusters as the latest touch force space-time distribution characteristic in the preset touch short period.
Preferably, the time cluster analysis sub-module includes:
A first time interval determining unit, configured to determine, as a first time interval, a maximum value in time intervals between reception moments of all the pairwise touch signals input by a user in a capacitive touch area in a latest preset touch short period;
the cluster dividing unit is used for carrying out cluster division on the receiving moments of all touch signals input by a user in a capacitor touch area in the latest preset touch short period to obtain at least one first moment cluster;
A first ratio determining unit, configured to treat the ratio of the covered time length of all the receiving moments in each first moment cluster to the first time interval as a first ratio of each first moment cluster;
A second ratio determining unit, configured to treat a maximum value of time intervals between all the reception times in each first time cluster as a second time interval of each first time cluster, treat a quotient of a time length covered by all the reception times in each first time cluster and a number of all the reception times in the corresponding first time cluster as a third time interval of each first time cluster, and treat a deviation ratio of the third time interval to the second time interval as a second ratio of each first time cluster;
The dividing process evaluation value determining unit is used for taking the sum of the first ratio and the second ratio of each first time cluster as the ratio sum of each first time cluster, and taking the average value of the ratio sums of all first time clusters obtained in the current cluster dividing process as the dividing process evaluation value of the current cluster dividing process;
And the time cluster determining unit is used for taking all the first time clusters obtained in the current cluster dividing process as the finally obtained time clusters if the dividing process evaluation value of the current cluster dividing process does not exceed the preset dividing process evaluation value, and re-carrying out cluster division on the receiving time of all the touch signals input by the user in the capacitor touch area in the latest preset touch short period if the dividing process evaluation value of the current cluster dividing process exceeds the preset dividing process evaluation value until the dividing process evaluation value of the latest cluster dividing process does not exceed the preset dividing process evaluation value, and taking all the first time clusters obtained in the latest cluster dividing process as the finally obtained time clusters.
Preferably, the touch force application dynamic track generation sub-module includes:
A single touch action period determining unit, configured to take a time period covered by all the receiving moments in each moment cluster as a single touch action period in a latest preset touch short period;
The touch force application dynamic track generation unit is used for sequencing and dynamically representing the touch point coordinates of the touch signals corresponding to all the receiving moments contained in each moment cluster according to the sequence of all the receiving moments in each moment cluster, and obtaining the touch force application dynamic track in the corresponding single touch action period.
Preferably, the applied force relative value determining sub-module comprises:
a waveform diagram cluster determining unit, configured to aggregate touch signal waveform diagrams of touch signals corresponding to all receiving moments included in each moment cluster, as a waveform diagram cluster;
The applied force relative value determining unit is used for determining the applied force relative value of the touch signal corresponding to each touch signal waveform diagram in each waveform diagram cluster in the corresponding single touch action period based on the normalized signal amplitude value and the applied force conversion coefficient of each touch signal waveform diagram in each waveform diagram cluster at each moment.
Preferably, the applied force relative value determination unit includes:
the first signal amplitude normalization subunit is used for normalizing the signal amplitude of each touch signal waveform diagram in each waveform diagram cluster at the same time to obtain the normalized signal amplitude of each touch signal waveform diagram in each waveform diagram cluster at each same time;
And the applied force relative value determining subunit is used for determining the applied force relative value of the touch signal corresponding to each touch signal waveform diagram in each waveform diagram cluster in the corresponding single touch action period based on the normalized signal amplitude and the applied force conversion coefficient of each touch signal waveform diagram in each waveform diagram cluster at the same time.
Preferably, the applied force relative value determination unit includes:
A normalized scaling factor determining subunit, configured to treat, as a normalized scaling factor of each touch signal waveform diagram in each waveform diagram cluster at each same time, a quotient of a normalized signal amplitude and a signal amplitude of each touch signal waveform diagram in each waveform diagram cluster at each same time;
a standard scaling factor determining subunit, configured to treat, as a standard scaling factor of each touch signal waveform diagram in each waveform diagram cluster, an average value of normalized scaling factors of each touch signal waveform diagram in each waveform diagram cluster at all the same time;
A second signal amplitude normalization subunit, configured to treat, as a normalized signal amplitude of each touch signal waveform in each waveform cluster at each time except all the same time, a product of a signal amplitude of each touch signal waveform in each waveform cluster at each time except all the same time and a standard scaling multiple;
And the applied force relative value determining subunit is used for taking the product of the average value of the normalized signal amplitude values of each touch signal waveform diagram in each waveform diagram cluster and the applied force conversion coefficient as the applied force relative value of the touch signal corresponding to each touch signal waveform diagram in each waveform diagram cluster in the corresponding single touch action period.
Preferably, the signal smoothing denoising module includes:
the model building sub-module is used for building a smooth denoising model;
The smooth denoising sub-module is used for inputting the latest touch force time-space distribution characteristic in a preset touch short period and the touch signal waveform diagrams of all the touch signals into the smooth denoising model to obtain the noiseless touch signals of all the touch signals as a signal adjustment result.
The invention provides a signal adjustment method of a capacitive sensing system, which is applied to the capacitive sensing system in any one of embodiments 1 to 10, and comprises the following steps:
S1, receiving all touch signals input by a user in a capacitor touch area in the latest preset touch short period, and determining touch point coordinates and receiving time of each touch signal and a touch signal waveform chart;
S2, analyzing the latest touch force space-time distribution characteristics in the preset touch short period based on the receiving time and the touch point coordinates of all the real-time touch signals received in the preset touch short period and the touch signal waveform diagram;
and S3, based on the touch force time-space distribution characteristics in the preset touch short period, smoothing and denoising the touch signal waveform diagrams of all touch signals in the latest preset touch short period to obtain the noiseless touch signals of all the touch signals, and taking the noiseless touch signals as a signal adjustment result.
The invention provides a capacitive touch screen terminal comprising a capacitive sensing system as described in any one of embodiments 1 to 10.
Compared with the prior art, the method has the beneficial effects that the smooth denoising of the touch signal waveform graph of all touch signals is realized based on the touch force space-time distribution characteristics, the change of the output capacitance signal of the capacitor induction system caused by false touch or false action is greatly reduced, the system performance fluctuation caused by external factors such as static electricity and electromagnetic interference or environmental changes such as temperature change and humidity change is also greatly reduced, and the user experience is improved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objects and other advantages of the application may be realized and obtained by means of the instrumentalities particularly pointed out in the specification.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of internal functional blocks of a capacitive sensing system according to an embodiment of the invention;
FIG. 2 is a flow chart of a signal adjustment method of a capacitive sensing system according to an embodiment of the invention;
Fig. 3 is a schematic diagram of a capacitive touch screen terminal according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Example 1:
The present invention provides a capacitive sensing system, referring to fig. 1, comprising:
the signal receiving and analyzing module is used for receiving all touch signals input by a user in a capacitor touch area in the latest preset touch short period, and determining touch point coordinates and receiving time of each touch signal and a touch signal waveform chart, wherein the touch signals are extracted from the capacitor signals output by each electrode pair in the electrode array;
The time-space distribution characteristic analysis module is used for analyzing the latest time-space distribution characteristic of the touch force in the preset touch short period based on the receiving time and the touch point coordinates of all the real-time touch signals received in the preset touch short period and the touch signal waveform diagram;
And the signal smoothing and denoising module is used for smoothing and denoising the touch signal waveform diagrams of all the touch signals in the latest preset touch short period based on the touch force time-space distribution characteristics in the latest preset touch short period to obtain noiseless touch signals of all the touch signals as a signal adjustment result.
In this embodiment, the preset touch short period is the maximum time that a normal touch action (an action for inputting a touch signal) can last.
In this embodiment, the capacitive touch area is a touchable area on the capacitive touch screen terminal for providing to a user who can input instructions by touching or clicking on a location or a portion of the area within the capacitive touch area.
In this embodiment, after a user touches a certain position in a capacitive touch area of the capacitive touch screen, an electric field between a parallel electrode pair disposed below the corresponding position in the capacitive touch area changes, so that an output capacitance of the parallel electrode pair changes, and a touch signal is a partial signal waveform of abrupt change of the output capacitance of the parallel electrode pair.
In this embodiment, the touch force temporal-spatial distribution feature is a feature in which the touch force input by the user in the capacitive touch region varies with time and space.
In this embodiment, the noiseless touch signal is a capacitance signal from which a change in the capacitance signal output by the capacitor induction system due to a false touch or a false operation is removed, and from which a change in the capacitance signal output by the capacitor induction system due to an external factor such as static electricity, electromagnetic interference, or an environmental change such as a temperature change, a humidity change, or the like is removed.
The technology has the beneficial effects that smooth denoising of touch signal waveform diagrams of all touch signals is realized based on touch force space-time distribution characteristics, capacitance signal change output by a capacitor induction system caused by false touch or false action is greatly reduced, system performance fluctuation caused by external factors such as static electricity and electromagnetic interference or environmental changes such as temperature change and humidity change is also greatly reduced, and user experience is improved.
Example 2:
on the basis of embodiment 1, the signal receiving and analyzing module includes:
the touch signal receiving sub-module is used for receiving the capacitance signals output by each electrode pair in the electrode array in real time and extracting all touch signals from all capacitance signals output in the latest preset touch short period;
the touch signal analysis submodule is used for determining the touch point coordinates and the receiving time of each touch signal and a touch signal waveform chart;
The electrode array is two groups of metal film electrodes which are parallel to each other, and the electrode array is arranged below a capacitive touch area in the capacitive touch equipment.
In this embodiment, the electrode array is two sets of metal film electrodes distributed parallel to each other, each set of metal film electrodes is uniformly distributed, and each metal film electrode in the two sets of metal film electrodes has a metal film electrode parallel to it.
In this embodiment, the electrode pairs are parallel to each other and form metal film electrodes of an electric field, and the output of each metal film electrode pair is connected to a signal processing circuit, the signal processing circuit connected to the electrode array receives a capacitance signal output by the electrode array, and when a user touches or presses a capacitance touch area in the capacitance touch device, the capacitance signal received by the signal processing circuit connected to the electrode array changes, where the circuit structure of the signal processing circuit is the same as the existing circuit structure (or an oscilloscope-like device) with the function of "reading capacitance signal".
The method has the advantages that the touch signal is extracted from the capacitance signal output by each electrode pair in the electrode array received in the latest preset touch short period, and the touch point coordinate and the receiving time of each touch signal and the touch signal waveform diagram are determined.
Example 3:
on the basis of embodiment 1, the touch signal receiving sub-module includes:
The waveform diagram generating unit is used for generating a waveform diagram of the capacitance signal of each electrode pair in the latest preset touch short period based on the capacitance signal output by each electrode pair in the electrode array received in real time;
A touch signal extraction unit, configured to take all the partial capacitive signal waveform segments with abrupt changes in amplitude existing in all the capacitive signal waveform diagrams as all the touch signals input by the user in the capacitive touch area in the latest preset touch short period;
The relevant parameter analysis unit is used for regarding the center coordinates of the electrode pairs corresponding to the capacitance signal waveform diagrams containing the touch signals as touch point coordinates of the corresponding touch signals, regarding the starting time of the corresponding touch signals as the receiving time of the corresponding touch signals, and regarding the forehead capacitance signal waveform sections corresponding to each touch signal as the touch signal waveform diagrams of the corresponding touch signals;
The center coordinates of the electrode pairs are represented by a preset two-dimensional coordinate system on the plane of the capacitive touch area.
In this embodiment, the capacitance signal waveform is a waveform including the output capacitance signal amplitude of a single electrode pair at each time within the latest preset touch period.
In this embodiment, the partial capacitance signal waveform segment is a partial waveform with abrupt amplitude change in the capacitance signal waveform graph, and the judgment basis of the abrupt change is that if the difference between the amplitude of the capacitance signal waveform segment at the current time and the amplitude of the capacitance signal waveform segment at the previous time is greater than a preset amplitude threshold, the partial waveform formed by connecting all the abrupt change points is determined as the partial capacitance signal waveform segment.
In this embodiment, the center coordinates of the electrode pair are two-dimensional coordinate values of the physical center of the projected area of the electrode pair in the capacitive touch area.
In this embodiment, the start time of the touch signal is the occurrence time of the start position of the partial capacitance signal waveform segment of the touch signal.
In this embodiment, the preset two-dimensional coordinate system is a preset two-dimensional coordinate system of a plane and a plane of the capacitive touch area, and the unit value of the abscissa and the ordinate is smaller than the edge or the diameter of the single electrode pair.
The method has the advantages that the capacitance signal waveform diagram is obtained by fitting the capacitance output signals of each electrode pair in the latest preset touch short period, partial capacitance signal waveform sections with abrupt change of signal amplitude are extracted, all touch signals input by a user in a capacitance touch area in the latest preset touch short period are obtained, and the touch point coordinates and the receiving time of each touch signal and the touch signal waveform diagram are determined based on the center coordinates of the electrode pairs, the starting time of the touch signals and the like.
Example 4:
on the basis of embodiment 1, the spatiotemporal distribution feature analysis module includes:
the time cluster analysis sub-module is used for carrying out cluster analysis on the receiving time of all touch signals input by a user in a capacitor touch area in the latest preset touch short period to obtain at least one time cluster;
The touch force application dynamic track generation sub-module is used for taking the time period covered by all the receiving moments in each moment cluster as a single touch action period in the latest preset touch short period, and determining the touch force application dynamic track in the single touch action period corresponding to each moment cluster;
the applied force relative value determining submodule is used for obtaining applied force relative values of the touch signals corresponding to all the receiving moments contained in each moment cluster in a corresponding single touch action period based on the amplitude characteristics of the touch signal waveform diagrams of the touch signals corresponding to all the receiving moments contained in each moment cluster;
The touch force dynamic track generation sub-module is used for carrying out mark combination on the application force relative values of the touch signals corresponding to all the receiving moments contained in each moment cluster and the touch force dynamic track in the corresponding single touch action period to obtain the touch force dynamic track of each moment cluster, and taking the touch force dynamic track of all the moment clusters as the latest touch force space-time distribution characteristic in the preset touch short period.
In this embodiment, the time cluster is a cluster including at least one receiving time obtained after performing cluster analysis on the receiving times of all touch signals input by a user in a capacitive touch area in a latest preset touch short period, all the receiving times in the time cluster are distributed and gathered in the latest preset touch short period, and the time interval between every two receiving times in the time cluster is uniform.
In this embodiment, the single touch action period is the duration of one touch action currently identified.
In this embodiment, the touch force application dynamic track is a change track including the movement of the force application position of the currently recognized one touch action with time.
In this embodiment, the amplitude characteristic is the signal amplitude at each time in the touch signal waveform.
In this embodiment, the applied force relative value represents a force value applied by the user at a corresponding position in the capacitive touch area at a corresponding time determined based on the touch signals corresponding to all the reception times included in each time cluster, compared to a relative magnitude value of force values applied by the user at the rest of the time determined based on the rest of the touch signals in the corresponding single touch action period at the rest of the time in the capacitive touch area.
In this embodiment, the relative values of the applied forces of the touch signals corresponding to all the receiving moments included in each moment cluster and the dynamic track of the applied force of the touch in the corresponding single touch action period are marked and combined as follows:
And marking the relative values of the applied force of the touch signals corresponding to all the receiving moments contained in each moment cluster at the position points corresponding to the receiving moments in the touch force application dynamic track corresponding to the single touch action period, namely finishing the process of marking the relative values of the applied force of the touch signals corresponding to all the receiving moments contained in each moment cluster in the touch force application dynamic track corresponding to the single touch action period.
In this embodiment, the touch force dynamic track is a change track including the force application position of one touch action currently identified and the corresponding force application relative value moving with time.
The method has the advantages that the single touch action period in the latest preset touch short period is determined through cluster analysis of the receiving moments of all touch signals input by a user in the capacitor touch area in the latest preset touch short period, the touch force application dynamic track in the single touch action period is further determined, and the touch force dynamic track of all moment clusters is obtained by combining the determined relative applied force values of the touch signals corresponding to all the receiving moments in the corresponding single touch action period, namely the touch force time-space distribution characteristics in the latest preset touch short period.
Example 5:
on the basis of embodiment 4, the temporal cluster analysis submodule includes:
A first time interval determining unit, configured to determine, as a first time interval, a maximum value in time intervals between reception moments of all the pairwise touch signals input by a user in a capacitive touch area in a latest preset touch short period;
the cluster dividing unit is used for carrying out cluster division on the receiving moments of all touch signals input by a user in a capacitor touch area in the latest preset touch short period to obtain at least one first moment cluster;
A first ratio determining unit, configured to treat the ratio of the covered time length of all the receiving moments in each first moment cluster to the first time interval as a first ratio of each first moment cluster;
A second ratio determining unit, configured to treat a maximum value of time intervals between all the reception times in each first time cluster as a second time interval of each first time cluster, treat a quotient of a time length covered by all the reception times in each first time cluster and a number of all the reception times in the corresponding first time cluster as a third time interval of each first time cluster, and treat a deviation ratio of the third time interval to the second time interval as a second ratio of each first time cluster;
The dividing process evaluation value determining unit is used for taking the sum of the first ratio and the second ratio of each first time cluster as the ratio sum of each first time cluster, and taking the average value of the ratio sums of all first time clusters obtained in the current cluster dividing process as the dividing process evaluation value of the current cluster dividing process;
And the time cluster determining unit is used for taking all the first time clusters obtained in the current cluster dividing process as the finally obtained time clusters if the dividing process evaluation value of the current cluster dividing process does not exceed the preset dividing process evaluation value, and re-carrying out cluster division on the receiving time of all the touch signals input by the user in the capacitor touch area in the latest preset touch short period if the dividing process evaluation value of the current cluster dividing process exceeds the preset dividing process evaluation value until the dividing process evaluation value of the latest cluster dividing process does not exceed the preset dividing process evaluation value, and taking all the first time clusters obtained in the latest cluster dividing process as the finally obtained time clusters.
In this embodiment, the deviation ratio of the third time interval to the second time interval is calculated by:
the ratio of the difference between the third time interval and the second time interval to the second time interval is regarded as the deviation ratio of the third time interval to the second time interval.
In this embodiment, the preset dividing process evaluation value is a preset value for judging whether the dividing process evaluation value according to which the current cluster dividing process meets the requirement is not exceeded.
The method has the advantages that the aggregation degree of all the receiving moments of the moment clusters in the latest preset touch short period is restrained based on the first ratio, the uniformity degree of the time intervals between every two receiving moments in the moment clusters is restrained based on the second ratio, and further the sum of the first ratio and the second ratio of all the first moment clusters obtained in the current cluster dividing process is used as the dividing process evaluation value of the current cluster dividing process, and the dividing process evaluation value of the current cluster dividing process is restrained from exceeding the preset dividing process evaluation value, so that all the receiving moments in the moment clusters obtained based on the cluster dividing process are distributed in the latest preset touch short period relatively and the time intervals between every two receiving moments in the moment clusters are relatively uniform.
Example 6:
on the basis of embodiment 4, the touch force application dynamic track generation sub-module includes:
A single touch action period determining unit, configured to take a time period covered by all the receiving moments in each moment cluster as a single touch action period in a latest preset touch short period;
The touch force application dynamic track generation unit is used for sequencing and dynamically representing the touch point coordinates of the touch signals corresponding to all the receiving moments contained in each moment cluster according to the sequence of all the receiving moments in each moment cluster, and obtaining the touch force application dynamic track in the corresponding single touch action period.
In this embodiment, the touch point coordinates of the touch signals corresponding to all the receiving moments included in each moment cluster are ordered and dynamically expressed as:
The touch point coordinates of the touch signals corresponding to all the receiving moments contained in each moment cluster are ordered, and the touch point coordinates of the touch signals corresponding to all the receiving moments contained in each moment cluster are displayed at time intervals based on the time intervals between the receiving moments of the touch signals corresponding to all the receiving moments contained in each moment cluster, namely the ordering and dynamic representation of the touch point coordinates are completed.
The touch point coordinates of the touch signals corresponding to all the receiving moments contained in each moment cluster are ordered and dynamically represented according to the sequence of all the receiving moments in each moment cluster, and a touch force application dynamic track in a single touch action period is obtained.
Example 7:
on the basis of embodiment 4, the applied force relative value determination submodule includes:
a waveform diagram cluster determining unit, configured to aggregate touch signal waveform diagrams of touch signals corresponding to all receiving moments included in each moment cluster, as a waveform diagram cluster;
The applied force relative value determining unit is used for determining the applied force relative value of the touch signal corresponding to each touch signal waveform diagram in each waveform diagram cluster in the corresponding single touch action period based on the normalized signal amplitude value and the applied force conversion coefficient of each touch signal waveform diagram in each waveform diagram cluster at each moment.
In this embodiment, the applied strength conversion coefficient is a preset conversion coefficient for converting the signal amplitude into an applied strength value, and the quotient of the applied strength value and the signal amplitude is applied to the strength conversion coefficient.
The method has the advantages that the corresponding waveform cluster is determined based on the time clusters, and the relative value of the applied force of the touch signal corresponding to each touch signal waveform in each waveform cluster in the corresponding single touch action period is determined based on the normalized signal amplitude and the applied force conversion coefficient of each touch signal waveform in each waveform cluster at each time.
Example 8:
On the basis of embodiment 7, the applied force relative value determination unit includes:
the first signal amplitude normalization subunit is used for normalizing the signal amplitude of each touch signal waveform diagram in each waveform diagram cluster at the same time to obtain the normalized signal amplitude of each touch signal waveform diagram in each waveform diagram cluster at each same time;
And the applied force relative value determining subunit is used for determining the applied force relative value of the touch signal corresponding to each touch signal waveform diagram in each waveform diagram cluster in the corresponding single touch action period based on the normalized signal amplitude and the applied force conversion coefficient of each touch signal waveform diagram in each waveform diagram cluster at the same time.
In this embodiment, the normalized signal amplitude at the same time is a signal amplitude obtained by normalizing the signal amplitude of each touch signal waveform at the same time in the waveform diagram cluster.
The method has the advantages that normalized signal amplitude values of the touch signal waveform diagrams in each waveform diagram cluster at the same time obtained by normalizing the signal amplitude values of the touch signal waveform diagrams in each waveform diagram cluster at the same time are utilized, and the applied force relative value of the touch signal corresponding to each touch signal waveform diagram in each waveform diagram cluster in the corresponding single touch action period is determined by combining the applied force conversion coefficient.
Example 9:
On the basis of embodiment 8, the applied force relative value determination unit includes:
A normalized scaling factor determining subunit, configured to treat, as a normalized scaling factor of each touch signal waveform diagram in each waveform diagram cluster at each same time, a quotient of a normalized signal amplitude and a signal amplitude (which is a signal amplitude in a corresponding stamp signal waveform diagram at the same time) of each touch signal waveform diagram in each waveform diagram cluster at each same time;
a standard scaling factor determining subunit, configured to treat, as a standard scaling factor of each touch signal waveform diagram in each waveform diagram cluster, an average value of normalized scaling factors of each touch signal waveform diagram in each waveform diagram cluster at all the same time;
A second signal amplitude normalization subunit, configured to treat, as a normalized signal amplitude of each touch signal waveform in each waveform cluster at each time except all the same time, a product of a signal amplitude of each touch signal waveform in each waveform cluster at each time except all the same time and a standard scaling multiple;
And the applied force relative value determining subunit is used for taking the product of the average value of the normalized signal amplitude values of each touch signal waveform diagram in each waveform diagram cluster and the applied force conversion coefficient as the applied force relative value of the touch signal corresponding to each touch signal waveform diagram in each waveform diagram cluster in the corresponding single touch action period.
In this embodiment, the normalized scaling factor is the quotient of the values of the signal amplitude before and after normalization.
In this embodiment, the standard scaling factor is the average of the normalized scaling factors of the individual touch signal waveforms in the individual waveform diagram clusters at all the same time instances.
The method has the advantages that based on the values of the signal amplitude values of all touch signals in each waveform diagram cluster at the time before and after normalization, the normalization scaling factors of each touch signal waveform diagram in the waveform diagram cluster at each same time are determined, the normalization scaling factors of each touch signal waveform diagram in the waveform diagram cluster at each same time are averaged, the standard scaling factors used for determining the normalization signal amplitude values of all touch signals in the corresponding waveform diagram cluster except for the time remaining time are determined, the normalization signal amplitude values of each touch signal waveform diagram in the obtained waveform diagram cluster at each time except for all the same time are learned, the calculation mode of the normalization signal amplitude value normalization process of the corresponding touch signal at all the same time is further guaranteed, and finally the reasonable degree of the normalization signal amplitude value of each touch signal waveform diagram in the waveform diagram cluster except for all the same time is calculated, so that the relative motion value of the corresponding motion value of each touch signal in the waveform diagram in the corresponding waveform diagram cluster is accurately calculated.
Example 10:
On the basis of embodiment 1, the signal smoothing denoising module includes:
the model building sub-module is used for building a smooth denoising model;
The smooth denoising sub-module is used for inputting the latest touch force time-space distribution characteristic in a preset touch short period and the touch signal waveform diagrams of all the touch signals into the smooth denoising model to obtain the noiseless touch signals of all the touch signals as a signal adjustment result.
In this embodiment, the construction of the smooth denoising model is to delete a large number of touch force space-time distribution characteristics of other preset touch periods and touch signal waveform diagrams of all touch signals, and correspondingly delete the manually calibrated noise signals (i.e., noise signals caused by false touch or false action, noise signals caused by external factors such as static electricity and electromagnetic interference, or noise signals caused by environmental changes such as temperature change and humidity change) contained in the touch signal waveform diagrams as the model obtained by training the training sample;
In the training process, other touch force space-time distribution characteristics in a preset touch short period and touch signal waveform diagrams of all touch signals are used as model input quantities, and correspondingly, the touch signals (namely, noiseless touch signals corresponding to the touch signals) which are contained in the touch signal are deleted (namely, noise signals caused by false touch or false action, noise signals caused by external factors such as static electricity, electromagnetic interference and the like, or noise signals caused by environmental changes such as temperature changes, humidity changes and the like) are used as model output quantities for training;
The smooth denoising model can utilize the touch force time-space distribution characteristic of the input preset touch in a short period to smooth denoising (namely, remove signal noise caused by false touch or false action, or signal noise caused by external factors such as static electricity, electromagnetic interference, or signal noise caused by environmental changes such as temperature change, humidity change, and the like) of touch signal waveform diagrams of all input touch signals, so as to obtain the noiseless touch signals of all input touch signals.
The method has the advantages that the smooth denoising model is built by introducing the touch force time-space distribution characteristic in the preset touch short period, so that the smooth denoising performance of the built smooth denoising model is better, the touch force time-space distribution characteristic in the latest preset touch short period and the touch signal waveform diagrams of all touch signals are input into the smooth denoising model, the smooth denoising of the touch signal waveform diagrams of all input touch signals is realized, namely, the change of the output capacitance signals of the capacitor induction system caused by false touch or false action is removed, and the change of the output capacitance signals of the capacitor induction system caused by external factors such as static electricity, electromagnetic interference or environmental changes such as temperature change and humidity change is also removed.
Example 11:
the invention provides a signal adjustment method of a capacitive sensing system, which is applied to the capacitive sensing system in any one of embodiments 1 to 10, and referring to fig. 2, the signal adjustment method comprises the following steps:
S1, receiving all touch signals input by a user in a capacitor touch area in the latest preset touch short period, and determining touch point coordinates and receiving time of each touch signal and a touch signal waveform chart;
S2, analyzing the latest touch force space-time distribution characteristics in the preset touch short period based on the receiving time and the touch point coordinates of all the real-time touch signals received in the preset touch short period and the touch signal waveform diagram;
and S3, based on the touch force time-space distribution characteristics in the preset touch short period, smoothing and denoising the touch signal waveform diagrams of all touch signals in the latest preset touch short period to obtain the noiseless touch signals of all the touch signals, and taking the noiseless touch signals as a signal adjustment result.
The signal adjustment method for the capacitive sensing system has the beneficial effects that smooth denoising of touch signal waveform diagrams of all touch signals is achieved based on touch force space-time distribution characteristics, capacitance signal change output by the capacitive sensing system due to false touch or false action is greatly reduced, system performance fluctuation caused by external factors such as static electricity and electromagnetic interference or environmental changes such as temperature change and humidity change is also greatly reduced, and user experience is improved.
Example 12:
the invention provides a capacitive touch screen terminal comprising a capacitive sensing system as described in any one of embodiments 1 to 10.
In this embodiment, referring to fig. 3, the capacitive touch screen terminal includes at least:
a driving circuit for supplying a voltage to the electrode array such that pairs of electrodes in the electrode array form an electric field;
the electrode array is used for forming an electric field and reflecting the touch action of a user on the change of the output capacitance;
the signal processing circuit is used for receiving the capacitance signals output by the electrode array and forwarding the capacitance signals to the processor;
a processor configured to implement smooth denoising of touch signal waveforms of all touch signals by loading the capacitive sensing system as described in any one of embodiments 1 to 10.
The capacitive touch screen terminal has the beneficial effects that smooth denoising of touch signal waveform diagrams of all touch signals is realized based on touch force space-time distribution characteristics, capacitance signal change output by a capacitor induction system caused by false touch or false action is greatly reduced, system performance fluctuation caused by external factors such as static electricity and electromagnetic interference or environmental changes such as temperature change and humidity change is also greatly reduced, and user experience is improved.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A capacitive sensing system, comprising:
the signal receiving and analyzing module is used for receiving all touch signals input by a user in a capacitor touch area in the latest preset touch short period, and determining touch point coordinates and receiving time of each touch signal and a touch signal waveform chart, wherein the touch signals are extracted from the capacitor signals output by each electrode pair in the electrode array;
The time-space distribution characteristic analysis module is used for analyzing the latest time-space distribution characteristic of the touch force in the preset touch short period based on the receiving time and the touch point coordinates of all the real-time touch signals received in the preset touch short period and the touch signal waveform diagram;
The signal smoothing denoising module is used for smoothing and denoising touch signal waveform diagrams of all touch signals in the latest preset touch short period based on touch force time-space distribution characteristics in the latest preset touch short period to obtain noiseless touch signals of all touch signals as signal adjustment results;
The preset touch short period is the longest time that a preset normal touch action can last;
The touch force time-space distribution characteristic is a characteristic that the touch force input by a user in a capacitive touch area changes with time and space.
2. The capacitive sensing system of claim 1, wherein the signal receiving and resolving module comprises:
the touch signal receiving sub-module is used for receiving the capacitance signals output by each electrode pair in the electrode array in real time and extracting all touch signals from all capacitance signals output in the latest preset touch short period;
the touch signal analysis submodule is used for determining the touch point coordinates and the receiving time of each touch signal and a touch signal waveform chart;
The electrode array is two groups of metal film electrodes which are parallel to each other, and the electrode array is arranged below a capacitive touch area in the capacitive touch equipment.
3. The capacitive sensing system of claim 2, wherein the electrode array is two sets of mutually parallel metal film electrodes and is disposed below a capacitive touch area in the capacitive touch device.
4. The capacitive sensing system of claim 1, wherein the touch signal receiving sub-module comprises:
The waveform diagram generating unit is used for generating a waveform diagram of the capacitance signal of each electrode pair in the latest preset touch short period based on the capacitance signal output by each electrode pair in the electrode array received in real time;
A touch signal extraction unit, configured to take all the partial capacitive signal waveform segments with abrupt changes in amplitude existing in all the capacitive signal waveform diagrams as all the touch signals input by the user in the capacitive touch area in the latest preset touch short period;
the related parameter analysis unit is used for regarding the center coordinates of the electrode pairs corresponding to the capacitance signal waveform diagrams containing the touch signals as touch point coordinates of the corresponding touch signals, regarding the starting time of the corresponding touch signals as the receiving time of the corresponding touch signals, and regarding the partial capacitance signal waveform sections corresponding to each touch signal as the touch signal waveform diagrams of the corresponding touch signals;
the center coordinates of the electrode pairs are represented by a preset two-dimensional coordinate system on the plane of the capacitive touch area;
The partial capacitance signal waveform section is a partial waveform with abrupt amplitude change in a capacitance signal waveform diagram, wherein the judgment basis of the 'amplitude abrupt change' is that if the difference between the amplitude of the capacitance signal waveform section at the current moment and the amplitude of the previous moment is larger than a preset amplitude threshold value, the current moment is judged as an abrupt change point, and the partial waveform formed by connecting all the abrupt change points is used as the partial capacitance signal waveform section.
5. The capacitive sensing system of claim 1, wherein the spatiotemporal distribution characterization module comprises:
the time cluster analysis sub-module is used for carrying out cluster analysis on the receiving time of all touch signals input by a user in a capacitor touch area in the latest preset touch short period to obtain at least one time cluster;
The touch force application dynamic track generation sub-module is used for taking the time period covered by all the receiving moments in each moment cluster as a single touch action period in the latest preset touch short period, and determining the touch force application dynamic track in the single touch action period corresponding to each moment cluster;
the applied force relative value determining submodule is used for obtaining applied force relative values of the touch signals corresponding to all the receiving moments contained in each moment cluster in a corresponding single touch action period based on the amplitude characteristics of the touch signal waveform diagrams of the touch signals corresponding to all the receiving moments contained in each moment cluster;
The touch force dynamic track generation sub-module is used for carrying out mark combination on the application force relative values of the touch signals corresponding to all the receiving moments contained in each moment cluster and the touch force dynamic track in the corresponding single touch action period to obtain the touch force dynamic track of each moment cluster, and taking the touch force dynamic track of all the moment clusters as the latest touch force space-time distribution characteristic in the preset touch short period;
wherein the single touch action period is a duration period of one touch action currently recognized;
the touch force application dynamic track is a change track which comprises the current identified force application position of one touch action and moves along with time;
The applied force relative value represents a force value applied by a user at a corresponding position in the capacitive touch area at a corresponding moment determined based on touch signals corresponding to all receiving moments contained in each moment cluster, and is compared with a relative magnitude value of force values applied by the user at other moments determined based on other touch signals in a corresponding single touch action period at other positions in the capacitive touch area;
The touch force dynamic track is a change track containing the force application position of one touch action which is currently identified and the corresponding force application relative value which moves along with time.
6. The capacitive sensing system of claim 5, wherein the touch-force-application dynamic trajectory generation sub-module comprises:
A single touch action period determining unit, configured to take a time period covered by all the receiving moments in each moment cluster as a single touch action period in a latest preset touch short period;
The touch force application dynamic track generation unit is used for sequencing and dynamically representing the touch point coordinates of the touch signals corresponding to all the receiving moments contained in each moment cluster according to the sequence of all the receiving moments in each moment cluster, and obtaining the touch force application dynamic track in the corresponding single touch action period.
7. The capacitive sensing system of claim 5, wherein the applied force relative value determination sub-module comprises:
a waveform diagram cluster determining unit, configured to aggregate touch signal waveform diagrams of touch signals corresponding to all receiving moments included in each moment cluster, as a waveform diagram cluster;
The applied force relative value determining unit is used for determining the applied force relative value of the touch signal corresponding to each touch signal waveform diagram in each waveform diagram cluster in the corresponding single touch action period based on the normalized signal amplitude value and the applied force conversion coefficient of each touch signal waveform diagram in each waveform diagram cluster at each moment.
8. The capacitive sensing system of claim 7, wherein the applied force relative value determination unit comprises:
the first signal amplitude normalization subunit is used for normalizing the signal amplitude of each touch signal waveform diagram in each waveform diagram cluster at the same time to obtain the normalized signal amplitude of each touch signal waveform diagram in each waveform diagram cluster at each same time;
And the applied force relative value determining subunit is used for determining the applied force relative value of the touch signal corresponding to each touch signal waveform diagram in each waveform diagram cluster in the corresponding single touch action period based on the normalized signal amplitude and the applied force conversion coefficient of each touch signal waveform diagram in each waveform diagram cluster at the same time.
9. A method for adjusting a signal of a capacitive sensing system, applied to the capacitive sensing system of any one of claims 1 to 8, comprising:
S1, receiving all touch signals input by a user in a capacitor touch area in the latest preset touch short period, and determining touch point coordinates and receiving time of each touch signal and a touch signal waveform chart;
S2, analyzing the latest touch force space-time distribution characteristics in the preset touch short period based on the receiving time and the touch point coordinates of all the real-time touch signals received in the preset touch short period and the touch signal waveform diagram;
and S3, based on the touch force time-space distribution characteristics in the preset touch short period, smoothing and denoising the touch signal waveform diagrams of all touch signals in the latest preset touch short period to obtain the noiseless touch signals of all the touch signals, and taking the noiseless touch signals as a signal adjustment result.
10. A capacitive touch screen terminal comprising a capacitive sensing system as claimed in any one of claims 1 to8.
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