CN110555350B - Elastic wave signal calibration device and method - Google Patents
Elastic wave signal calibration device and method Download PDFInfo
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Abstract
The invention provides an elastic wave signal calibration method, which comprises the following steps: acquiring a control signal, and acquiring vibration element information according to the control signal; obtaining a pre-stored vibration instruction according to the vibration element information, and controlling the vibration element to generate an excitation signal on the substrate according to the vibration instruction; collecting the excitation signals through a plurality of sensors arranged on the substrate, and respectively receiving response signals fed back by the sensors; and respectively comparing the response signals with preset standard response signals, and calibrating the sensor according to the comparison result.
Description
Technical Field
The invention relates to the field of electromechanical interaction, in particular to an elastic wave signal calibration device and method.
Background
With the development of electronic technology, the lightness and thinness of portable electronic devices have become the primary research and development directions of electronic manufacturers, and users have come to pay more attention to the lightness and thinness of electronic devices; in order to reduce the space occupied by the portable electronic device and the weight thereof, a large number of mechanical devices occupying a larger space are instead assigned, the conventional keyboard is one of the above-mentioned devices that need to be replaced by a reduced device, and a mode of recognizing the user touch by using a small number of sensing devices, such as a "virtual keyboard" as a substitute product, is developed.
The devices such as the virtual keyboards and the like are mainly used for touch detection in a full-coverage or grid type sensing device installation mode, and the mode has higher cost and larger occupied space; if fewer elements are used for identifying touch, the received touch signals are different due to different positions and differences of internal spaces, so that the touch cannot be accurately identified in practical application.
In order to overcome the problems, in the prior art, all operation points of each virtual keyboard and other equipment need to be touched and detected when the equipment leaves a factory, so that subsequent normal use is ensured, the detection mode mainly adopts a point-by-point clicking mode of an external mechanical arm to detect and judge at the present stage, the process is complex, the time cost is high, and the virtual keyboard cannot be effectively popularized on a large scale; meanwhile, after the devices leave the factory, the detection of the devices is also affected due to the addition or change of external auxiliary devices, so that the touch condition cannot be accurately identified.
Therefore, how to provide a calibration method with simple calibration procedure and accurate detection becomes a great problem to be solved urgently in the industry.
Disclosure of Invention
The invention aims to provide an elastic wave signal calibration method which is simple and convenient and can be used for quickly calibrating on any occasion, so that a user can conveniently calibrate used equipment, and related electronic equipment can be accurately and effectively identified and detected.
To achieve the above object, the method for calibrating an elastic wave signal provided by the present invention specifically comprises: acquiring a control signal, and acquiring vibration element information according to the control signal; obtaining a pre-stored vibration instruction according to the vibration element information, and controlling the vibration element to generate an excitation signal on the substrate according to the vibration instruction; collecting the excitation signals through a plurality of sensors arranged on the substrate, and respectively receiving response signals fed back by the sensors; and respectively comparing the response signals with preset standard response signals, and calibrating the sensor according to the comparison result.
In the method for calibrating an elastic wave signal, preferably, the vibration element includes a motor, a horn, and a mechanical vibration source capable of generating vibration or an elastic wave signal on the substrate; the excitation signal is a narrow pulse signal or a continuous fluctuation signal.
In the above method for calibrating an elastic wave signal, preferably, comparing the response signals with preset standard response signals respectively further includes: and filtering the response signal according to the frequency band of the excitation signal, and comparing the response signal after filtering with a preset standard response signal.
In the above method for calibrating an elastic wave signal, preferably, the comparing the response signals with preset standard response signals, and calibrating the sensor according to the comparison result includes: comparing the response signals with preset standard response signals respectively, and setting the response coefficient of the sensor corresponding to each response signal according to the comparison result; and calibrating the sensor according to the response coefficient.
In the method for calibrating an elastic wave signal, preferably, the response coefficient is a proportionality coefficient between the received response signal and a preset standard response signal.
In the elastic wave signal calibration method, preferably, the preset standard response signal is a response signal fed back by a sensor at a predetermined position after a pre-stored vibration instruction is used to control the corresponding vibration element to generate an excitation signal.
In the method for calibrating an elastic wave signal, preferably, the sensor is a piezoelectric ceramic sensor, a piezoelectric film sensor, a piezoelectric crystal sensor or other sensors with piezoelectric effect.
In the above method for calibrating an elastic wave signal, preferably, the comparing the response signals with preset standard response signals further includes: and comparing the response signal with a preset threshold value, and outputting a prompt signal when the response signal exceeds the preset threshold value.
The invention also provides an elastic wave signal calibration device, which comprises a control module, an acquisition module and a calibration module; the control module is used for acquiring a control signal and acquiring vibration element information according to the control signal; obtaining a pre-stored vibration instruction according to the vibration element information, and controlling the vibration element to generate an excitation signal on the substrate according to the vibration instruction; the acquisition module is used for acquiring the excitation signals through a plurality of sensors arranged on the substrate and respectively receiving response signals fed back by the sensors; the calibration module is used for comparing the response signals with preset standard response signals respectively and calibrating the sensor according to the comparison result.
In the elastic wave signal calibration device, preferably, the calibration module further includes a calculation unit, and the calculation unit is configured to compare the response signals with preset standard response signals, and set response coefficients of the sensors corresponding to the response signals according to comparison results; and calibrating the sensor according to the response coefficient.
In the elastic wave signal calibration device, preferably, the calibration device further includes a standard response signal pre-storing module, and the standard response signal pre-storing module is configured to generate a standard response signal according to a response signal fed back by a sensor at a predetermined position after controlling the corresponding vibration element to generate an excitation signal according to a pre-stored vibration instruction.
In the elastic wave signal calibration apparatus, it is preferable that the calibration module further includes a prompt unit, and the prompt unit is configured to compare the response signal with a preset threshold, and output a prompt signal when the response signal exceeds the preset threshold.
The beneficial technical effects of the invention are as follows: the method and the device for calibrating the elastic wave signal can help a user to complete the calibration of the elastic wave signal at any time, have lower requirements on external auxiliary equipment and are more accurate; the calibration of the elastic wave signal can be timely and accurately completed aiming at equipment with different structures and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic flow chart of an elastic wave signal calibration method according to the present invention;
fig. 2 is a schematic structural diagram of an elastic wave signal calibration apparatus provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention is described in further detail below with reference to the embodiments and the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
In the description herein, reference to the term "an embodiment," "a particular embodiment," "for example," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. The sequence of steps involved in the various embodiments is provided to illustrate the practice of the present application, and the sequence of steps is not limited thereto and can be adjusted as needed.
Referring to fig. 1, the method for calibrating an elastic wave signal provided by the present invention specifically includes: s101, acquiring a control signal, and acquiring vibration element information according to the control signal; s102, obtaining a pre-stored vibration instruction according to the vibration element information, and controlling the vibration element to generate an excitation signal on the substrate according to the vibration instruction; s103, acquiring the excitation signals through a plurality of sensors arranged on the substrate, and respectively receiving response signals fed back by the sensors; s104, the response signals are respectively compared with preset standard response signals, and the sensor is calibrated according to the comparison result. The vibrating element comprises a motor, a loudspeaker and a mechanical vibration source capable of generating vibration or elastic wave signals on the substrate. In actual work, a user can input a control signal according to actual needs when the equipment needs to be calibrated by elastic wave signals, appoint any vibration element to generate vibration, the vibration generates elastic wave signals on a substrate, and then each sensor receives the elastic wave signals and generates feedback signals, for example, voltage signals generated by a piezoelectric sensor according to the elastic wave signals are feedback signals, a central processing unit such as a single chip microcomputer or an intelligent chip respectively receives the feedback signals, compares the feedback signals with preset standard response signals to obtain difference ratios of the feedback signals and the standard signals of each sensor, and can respectively calibrate the feedback values of each sensor by using the difference ratios; it is worth mentioning that the sensor may be a piezoelectric ceramic sensor, a piezoelectric film sensor, a piezoelectric crystal sensor or other sensors having piezoelectric effect; when the sensor is a piezoelectric sensor, the vibration element can be integrated with the sensor, after the piezoelectric sensor at a preset position generates vibration, other piezoelectric sensors receive elastic wave signals caused by the vibration to perform self calibration, and by analogy, the sensors generate vibration in turn, so that the calibration of the elastic wave signals of the equipment can be accurately completed, when a user touches the substrate, the sensors can all feed back accurate signals, the result is more accurate and effective during later-period elastic wave signal calculation, and the problem of individual response difference caused by the fact that the sensors are arranged at different positions under the substrate is effectively solved.
In the above embodiment, the excitation signal is a narrow pulse signal or a continuous wave signal, wherein the frequency and amplitude of the pulse signal or the continuous wave signal need to be determined according to the mounting structure, the substrate characteristics, and the sensor response characteristics; when the elastic wave signal calibration is carried out by a user in the later period, the internal structure of the equipment can be determined according to the model of the current equipment or other data capable of indicating the current equipment, the preset frequency or amplitude value is obtained according to the internal structure, and then the vibration element is appointed to output the corresponding frequency or amplitude value to finish the calibration of the elastic wave signal; in practical operation, the frequency or amplitude can be set according to practical requirements, and the invention is not limited herein.
In the above embodiment, the step S104 of comparing the response signals with the preset standard response signals further includes: and filtering the response signal according to the frequency band of the excitation signal, and comparing the response signal after filtering with a preset standard response signal. In actual work, a band-pass filter can be adopted to filter the response signal by utilizing the frequency band of the excitation signal, then the response signal is compared with the standard response signal to obtain a response coefficient, and the elastic wave signal calibration of each sensor at the later stage is completed by the response coefficient; of course, the filtering method using the known frequency band for subsequent filtering is a common filtering process, and the present invention is not described in detail herein.
In a preferred embodiment of the present invention, the step S104 of comparing the response signals with preset standard response signals respectively, and calibrating the sensor according to the comparison result includes: comparing the response signals with preset standard response signals respectively, and setting response coefficients of the sensors corresponding to the response signals according to comparison results; and calibrating the sensor according to the response coefficient. And the response coefficient is a proportionality coefficient of the received response signal and a preset standard response signal. The preset standard response signal is a response signal fed back by a sensor at a preset position after the corresponding vibration element is controlled by a prestored vibration instruction to generate an excitation signal. In this embodiment, a worker may control a predetermined vibrating element or sensor to generate vibration, and then collect elastic wave signals collected by other sensors, compare the elastic wave signals with a preset standard response signal to determine an attenuation condition of each elastic wave signal, and multiply a response coefficient according to the attenuation condition to make the elastic wave signals consistent with the preset standard response signal, where the response coefficient may be obtained by dividing the preset standard response signal by each elastic wave signal, and certainly, in actual work, different intervals may be classified, and a preset response coefficient of each interval is obtained according to a position of each elastic wave signal in each interval.
In the above embodiment, the comparing the response signals with the preset standard response signals in step S104 may further include: and comparing the response signal with a preset threshold value, and outputting a prompt signal when the response signal exceeds the preset threshold value. In actual operation, because the electronic equipment comprises a plurality of sensors, the actual use of the individual sensors is not affected when the individual sensors are in fault, therefore, the response signals are further judged before the response signals are compared with the standard response signals in the process, and whether the corresponding sensors are normal or not is judged; for example, a sensor preset threshold is 3-6; when the response signal is higher than 6 or lower than 3, the preset threshold value is exceeded, at the moment, a prompt signal is output to indicate that the sensor possibly has problems, and the response data of the sensor can be abandoned in subsequent use, so that the situations of detection errors and the like are avoided; of course, the present invention may be selected according to the specific situation when actually used, and the present invention is not limited to the above.
In the above embodiment, the standard response signal may also be a mean value or a median value of the sensor amplitude (or energy) responses of a certain number of vibration sources, for example, by obtaining response signals obtained by the sensors in a predetermined area under vibration of the vibration sources, and obtaining the standard response signal according to the mean value or the median value of the response signals; obtaining a response amplitude (or energy) selected in the early stage as a reference, and when the sensor amplitude (or energy) generated by other vibration sources has deviation from the standard response, multiplying the sensor response amplitude (or energy) by a scaling coefficient to obtain a calibration response of the sensor response, wherein the scaling coefficient is used as a calibration coefficient, and most simply, the scaling coefficient is the actual response amplitude (or energy) divided by the reference response amplitude (or energy); the response amplitude of the sensor can be obtained according to the frequency of the elastic wave signal, for example, when the sensor collects the elastic wave signal, the elastic wave signal is converted into a voltage signal with the same frequency or an equal ratio, and then the response amplitude or energy is obtained by calculation by using the voltage signal; the calculation method of the response energy can be calculated by the following formula:
In the above formula, m is the number of collected signal points; n is the number of signal points determined by selecting the wavelength of the voltage signal with the preset length according to the actual situation, and related technicians in the field can select the setting according to the actual needs, and the invention is not further limited herein; e is the energy value of the voltage signal.
Through the method, after the energy value of the elastic wave signal is obtained, the elastic wave signal calibration method provided by the invention can calibrate the force value of each sensor response, the specific method is similar to the calibration method, only when the response signal of each sensor is collected subsequently, the energy value of each sensor is further calculated according to the response signals, the energy values are compared with a preset standard response energy value to determine the error rate, namely the response coefficient, of each sensor, so that the force value calibration of each sensor is completed, in the actual work, each intelligent device adopts different use directions of the elastic wave signals, the required acquisition precision is different, therefore, related technicians in the field can select the calibrated application surface according to actual needs, and the invention does not limit the application surface.
Referring to fig. 2, the present invention further provides an elastic wave signal calibration apparatus, which includes a control module, an acquisition module, and a calibration module; the control module is used for acquiring a control signal and acquiring vibration element information according to the control signal; obtaining a pre-stored vibration instruction according to the vibration element information, and controlling the vibration element to generate an excitation signal on the substrate according to the vibration instruction; the acquisition module is used for acquiring the excitation signals through a plurality of sensors arranged on the substrate and respectively receiving response signals fed back by the sensors; the calibration module is used for comparing the response signals with preset standard response signals respectively and calibrating the sensor according to the comparison result. Wherein, the sensor can be a piezoelectric ceramic sensor, a piezoelectric film sensor, a piezoelectric crystal sensor or other sensors with piezoelectric effect; when the sensor is a piezoelectric sensor, the vibration element can be integrated with the sensor, after the piezoelectric sensor at a preset position generates vibration, other piezoelectric sensors receive elastic wave signals caused by the vibration to perform self calibration, and by analogy, the sensors generate vibration in turn, so that the calibration of the elastic wave signals of the equipment can be accurately completed, when a user touches the substrate, the sensors can all feed back accurate signals, the result is more accurate and effective during later-period elastic wave signal calculation, and the problem of individual response difference caused by the fact that the sensors are arranged at different positions under the substrate is effectively solved. The substrate may be made of rigid materials such as existing touch screens, glass, wood boards, etc., and has the function of generating elastic wave signals according to the vibration generated by the connected vibration elements.
In the above embodiment, the calibration module further includes a calculating unit, and the calculating unit is configured to compare the response signals with preset standard response signals, and set response coefficients of the sensors corresponding to the response signals according to comparison results; and calibrating the sensor according to the response coefficient. The calibration device further comprises a standard response signal pre-storing module, and the standard response signal pre-storing module is used for controlling the corresponding vibration element to generate an excitation signal through a pre-stored vibration instruction and then generating a standard response signal according to a response signal fed back by the sensor at a preset position. The standard response signal pre-storing module can be a memory.
In the above embodiment, the calibration module further includes a prompt unit, where the prompt unit is configured to compare the response signal with a preset threshold, and output a prompt signal when the response signal exceeds the preset threshold. In actual operation, because the electronic equipment comprises a plurality of sensors, the actual use of the individual sensors is not affected when the individual sensors are in fault, therefore, the response signals are further judged before the response signals are compared with the standard response signals in the process, and whether the corresponding sensors are normal or not is judged; for example, a certain sensor preset threshold is 3-6; when the response signal is higher than 6 or lower than 3, the preset threshold value is exceeded, at the moment, a prompt signal is output to indicate that the sensor possibly has problems, and the response data of the sensor can be abandoned in subsequent use, so that the situations of detection errors and the like are avoided; of course, the present invention may be selected according to the specific situation when actually used, and the present invention is not limited to the above.
The elastic wave signal calibration device provided by the invention can be applied to the existing devices such as smart phones, tablet computers, smart household appliances and the like, the calibration time of a user is greatly saved by utilizing the advantages that the calibration process is simple, external auxiliary devices are not needed, and the calibration can be carried out at any time and place, so that the user is helped to quickly and accurately finish the calibration on touch or touch pressure, and the use convenience and the calibration efficiency of the user are improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (11)
1. An elastic wave signal calibration method, the method comprising:
acquiring a control signal, and acquiring vibration element information according to the control signal;
obtaining a pre-stored vibration instruction according to the vibration element information, and controlling the vibration element to generate an excitation signal on the substrate according to the vibration instruction; the vibrating element comprises a sensor arranged on the substrate, and the sensor on the substrate is taken as the vibrating element in turn;
the method comprises the following steps of collecting the excitation signals through a plurality of sensors arranged on the substrate, respectively receiving response signals fed back by the sensors, respectively comparing the response signals with preset standard response signals, and calibrating the sensors according to comparison results, wherein the method comprises the following steps: after a sensor serving as a vibrating element vibrates, acquiring elastic wave signals caused by the vibration through other sensors arranged on the substrate, respectively receiving response signals fed back by the other sensors, respectively comparing the response signals with preset standard response signals, and calibrating the other sensors according to the comparison result.
2. The method for calibrating an elastic wave signal according to claim 1, wherein comparing the response signals with preset standard response signals respectively further comprises: and filtering the response signal according to the frequency band of the excitation signal, and comparing the response signal after filtering with a preset standard response signal.
3. The method for calibrating an elastic wave signal according to claim 1, wherein the comparing the response signals with preset standard response signals respectively, and calibrating the sensor according to the comparison result comprises: comparing the response signals with preset standard response signals respectively, and setting the response coefficient of the sensor corresponding to each response signal according to the comparison result; and calibrating the sensor according to the response coefficient.
4. The method for calibrating an elastic wave signal according to claim 3, wherein the response coefficient is a proportionality coefficient between the received response signal and a preset standard response signal.
5. The method for calibrating an elastic wave signal according to claim 1, wherein the predetermined standard response signal is a response signal fed back by a sensor at a predetermined position after a pre-stored vibration command is used to control a corresponding vibrating element to generate an excitation signal.
6. The method for calibrating an elastic wave signal according to claim 1, wherein the sensor is a piezoelectric ceramic sensor, a piezoelectric film sensor, a piezoelectric crystal sensor or other sensors having piezoelectric effect.
7. The method for calibrating an elastic wave signal according to claim 1, wherein comparing the response signals with preset standard response signals further comprises: and comparing the response signal with a preset threshold value, and outputting a prompt signal when the response signal exceeds the preset threshold value.
8. An elastic wave signal calibration device is characterized by comprising a control module, an acquisition module and a calibration module;
the control module is used for acquiring a control signal and acquiring vibration element information according to the control signal; obtaining a pre-stored vibration instruction according to the vibration element information, and controlling the vibration element to generate an excitation signal on the substrate according to the vibration instruction; the vibrating element comprises a sensor arranged on the substrate, and the sensor on the substrate is taken as the vibrating element in turn;
the acquisition module is used for acquiring the excitation signal through a plurality of sensors arranged on the substrate and respectively receiving response signals fed back by the sensors, and comprises: after a sensor serving as a vibration element generates vibration, acquiring elastic wave signals caused by the vibration through other sensors arranged on the substrate, and respectively receiving response signals fed back by the other sensors;
The calibration module is used for comparing the response signals with preset standard response signals respectively and calibrating the sensor according to the comparison result, and comprises: and respectively comparing the response signals with preset standard response signals, and calibrating the other sensors according to the comparison result.
9. The device for calibrating an elastic wave signal according to claim 8, wherein the calibration module further comprises a calculation unit, the calculation unit is configured to compare the response signals with preset standard response signals, and set response coefficients of the sensors corresponding to the response signals according to the comparison result; and calibrating the sensor according to the response coefficient.
10. The device for calibrating an elastic wave signal according to claim 8, further comprising a standard response signal pre-storing module, wherein the standard response signal pre-storing module is configured to generate a standard response signal according to a response signal fed back from the sensor at a predetermined position after controlling the corresponding vibrating element to generate an excitation signal according to a pre-stored vibration command.
11. The apparatus according to claim 8, wherein the calibration module further comprises a prompt unit, the prompt unit is configured to compare the response signal with a preset threshold, and output a prompt signal when the response signal exceeds the preset threshold.
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| CN113219067B (en) * | 2021-05-27 | 2023-04-07 | 北京钛方科技有限责任公司 | Elastic wave sensor paste state judgment method, device and system |
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