CN113517935B - Ultrasonic calibration method, device, mobile terminal and storage medium - Google Patents

Abstract

The application discloses an ultrasonic calibration method, an ultrasonic calibration device, a mobile terminal and a storage medium, wherein the ultrasonic calibration method is applied to the mobile terminal and comprises the following steps: in the moving state of relative movement between the mobile terminal and the object, sending an ultrasonic signal through an ultrasonic transmitting module, and receiving an ultrasonic signal returned by the ultrasonic signal after encountering the object through an ultrasonic receiving module; acquiring an ultrasonic characteristic value of an ultrasonic signal in a transmission process; acquiring a difference value between the ultrasonic characteristic value and a target characteristic value, wherein the target characteristic value is a characteristic value of an ultrasonic signal detected by a standard terminal in a moving state in a transmission process; and adjusting the emission intensity when the ultrasonic signal is sent every time and adjusting the ultrasonic characteristic value obtained every time according to the difference value. The method can calibrate the ultrasonic characteristic value so as to improve the accuracy of detecting the moving state of the relative object by the mobile terminal.

Description

Ultrasonic calibration method, device, mobile terminal and storage medium

technical field

The present application relates to the technical field of mobile terminals, and more specifically, to an ultrasonic calibration method and device, a mobile terminal and a storage medium.

Background technique

Mobile terminals, such as mobile phones and tablet computers, have become one of the most commonly used consumer electronic products in people's daily life. With the increasing development of mobile terminal technology, full-screen and curved-screen mobile phones have become mainstream products. Due to the need to save the top space of mobile terminals, many manufacturers use ultrasonic proximity detection solutions on mobile terminals to replace traditional infrared proximity detection solutions. However, after the mobile terminal is used for a period of time, some internal devices or structures of the mobile terminal will undergo subtle changes, and these changes will affect the spectrum characteristics, thereby affecting the accuracy of the ultrasonic proximity detection solution.

Contents of the invention

In view of the above problems, the present application proposes an ultrasonic calibration method, device, mobile terminal and storage medium to improve the above problems.

In the first aspect, the embodiment of the present application provides an ultrasonic calibration method, which is applied to a mobile terminal, the mobile terminal includes an ultrasonic transmitting module and an ultrasonic receiving module, and the method includes: relatively moving between the mobile terminal and an object In the moving state, the ultrasonic signal is sent through the ultrasonic transmitting module, and the ultrasonic signal is received by the ultrasonic receiving module when the ultrasonic signal returns after encountering an object; the ultrasonic characteristic value of the ultrasonic signal in the transmission process is obtained; and the ultrasonic signal is obtained. The difference between the ultrasonic eigenvalue and the target eigenvalue, the target eigenvalue is the eigenvalue of the ultrasonic signal detected by the standard terminal in the moving state during transmission; according to the difference value, the mobile terminal In the moving state, the ultrasonic transmitting module adjusts the emission intensity of the ultrasonic signal each time it sends, and adjusts the ultrasonic characteristic value acquired by the mobile terminal in the moving state each time.

In the second aspect, the embodiment of the present application provides an ultrasonic calibration device, which is applied to a mobile terminal. The mobile terminal includes an ultrasonic transmitting module and an ultrasonic receiving module. The device includes: a transceiver control module, a feature acquisition module, and a difference acquisition module and an adjustment execution module, wherein the transceiver control module is configured to send ultrasonic signals through the ultrasonic transmitting module and receive ultrasonic signals through the ultrasonic receiving module in a moving state of relative movement between the mobile terminal and the object The ultrasonic signal returned after encountering the object; the feature acquisition module is used to acquire the ultrasonic characteristic value of the ultrasonic signal during transmission; the difference acquisition module is used to obtain the difference between the ultrasonic characteristic value and the target characteristic value value, the target eigenvalue is the eigenvalue of the ultrasonic signal detected by the standard terminal in the moving state during the transmission process; the adjustment execution module is used to adjust the mobile terminal in the moving In this state, the ultrasonic transmitting module adjusts the emission intensity of each time the ultrasonic signal is sent, and adjusts the ultrasonic characteristic value acquired each time by the mobile terminal in the moving state.

In a third aspect, the embodiment of the present application provides a mobile terminal, including: one or more processors; memory; one or more application programs, wherein the one or more application programs are stored in the memory and The one or more programs are configured to be executed by the one or more processors, and the one or more programs are configured to execute the ultrasonic calibration method provided in the first aspect above.

In the fourth aspect, the embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium stores program codes, and the program codes can be invoked by a processor to execute the ultrasonic wave provided by the first aspect above. Calibration method.

In the solution provided by this application, in the mobile state of relative movement between the mobile terminal and the object, the ultrasonic signal is sent through the ultrasonic transmitting module, and the ultrasonic signal returned by the ultrasonic signal after encountering the object is received through the ultrasonic receiving module, and the ultrasonic signal is acquired. Ultrasonic eigenvalue in the transmission process, obtain the difference value between the ultrasonic eigenvalue and the target eigenvalue, the target eigenvalue is the eigenvalue of the ultrasonic signal detected by the standard terminal in the moving state during the transmission process, according to the difference value, the mobile When the terminal is in a moving state, the emission intensity of the ultrasonic transmitting module is adjusted each time the ultrasonic signal is sent. Therefore, according to the difference value between the ultrasonic characteristic value acquired in the same moving state and the ultrasonic characteristic value obtained by the standard terminal, the mobile terminal is in this moving state. The ultrasonic eigenvalues used for proximity detection are adjusted so that the acquired ultrasonic eigenvalues can be calibrated, so that the mobile terminal can detect the moving state between relative objects more accurately.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 shows a schematic diagram of an ultrasonic propagation path provided by an embodiment of the present application.

Fig. 2 shows a flowchart of an ultrasonic calibration method according to an embodiment of the present application.

Fig. 3 shows a flowchart of an ultrasonic calibration method according to another embodiment of the present application.

FIG. 4 shows a spectrum diagram of audio data provided by the embodiment of the present application.

Fig. 5 shows a flowchart of an ultrasonic calibration method according to yet another embodiment of the present application.

Fig. 6 shows a block diagram of an ultrasonic calibration device according to an embodiment of the present application.

Fig. 7 is a block diagram of a mobile terminal for performing an ultrasonic calibration method according to an embodiment of the present application according to an embodiment of the present application.

Fig. 8 is a storage unit for storing or carrying program codes for implementing the ultrasonic calibration method according to the embodiment of the present application according to the embodiment of the present application.

detailed description

In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

At present, with the increasing development of mobile terminal technology, there are more and more mobile terminals with curved screens and full screens. In order to save the top space of mobile terminals, many manufacturers use ultrasonic proximity detection solutions on mobile terminals to replace traditional infrared proximity detection. Program. At present, the ultrasonic proximity monitoring scheme is that the mobile terminal emits ultrasonic waves through ultrasonic sending devices (such as earpieces, speakers, special ultrasonic transmitters, etc.), and part of the ultrasonic waves propagates through the air to the ultrasonic receiving module (pickup) (path 1 in Figure 1). A part of the ultrasonic wave propagates through the air and is reflected by the shield and then reaches the ultrasonic receiving module (as shown in path 2 in Figure 1). What the ultrasonic receiving module picks up is the superimposed signal of the direct sound and the reflected sound, which is converted into an audio signal by the A/D converter. The audio data is processed by an algorithm to obtain the movement state of the occluder relative to the mobile terminal, and then guide the display screen of the mobile terminal to be in the on-screen state or off-screen state.

After a long period of research, the inventor found that after most mobile terminals have been used for a certain period of time, the internal devices or structures of the mobile terminals will undergo subtle changes, for example, the ultrasonic transmitting modules such as the ultrasonic earpieces and speakers of the mobile terminals will change. Variations can affect the spectral characteristics and, in turn, the accuracy of the ultrasonic inspection scheme.

In view of the above problems, the inventor proposes the ultrasonic calibration method, device, mobile terminal and storage medium provided by the embodiment of the present application, by obtaining the difference value between the ultrasonic characteristic value obtained in the same moving state and the ultrasonic characteristic value obtained by the standard terminal, and According to the difference value, the emission intensity of the ultrasonic signal sent by the mobile terminal in this moving state is adjusted each time, and the ultrasonic characteristic value acquired each time is adjusted, so that the acquired ultrasonic characteristic value can be calibrated, so that the mobile terminal detects It is more accurate to show the movement state between relative objects. Wherein, the specific ultrasonic calibration method will be described in detail in the subsequent embodiments.

Please refer to FIG. 2 . FIG. 2 shows a schematic flowchart of an ultrasonic calibration method provided by an embodiment of the present application. The ultrasonic calibration method is used to adjust the emission intensity of the ultrasonic signal sent by the mobile terminal each time in the mobile state according to the difference between the ultrasonic characteristic value obtained in the same moving state and the ultrasonic characteristic value obtained by the standard terminal, and to adjust the The ultrasonic characteristic value acquired each time is adjusted, so that the acquired ultrasonic characteristic value used for proximity detection can be calibrated. In a specific embodiment, the ultrasonic calibration method is applied to the ultrasonic calibration device 400 shown in FIG. 6 and the mobile terminal 100 ( FIG. 7 ) equipped with the ultrasonic calibration device 400 . The following will take a mobile terminal as an example to illustrate the specific process of this embodiment. Of course, it can be understood that the mobile terminal applied in this embodiment can be a smart phone, a tablet computer, a wearable electronic device, etc., and is not limited here. Wherein, in this embodiment, the mobile terminal may include an ultrasonic transmitting module and an ultrasonic receiving module. The process shown in FIG. 2 will be described in detail below, and the ultrasonic calibration method may specifically include the following steps:

Step S110: In the mobile state of relative movement between the mobile terminal and the object, send an ultrasonic signal through the ultrasonic transmitting module, and receive an ultrasonic signal returned after the ultrasonic signal encounters the object through the ultrasonic receiving module.

In the embodiment of the present application, the mobile terminal may include an ultrasonic sending module and an ultrasonic receiving module at the same time. During the movement of the ultrasonic sending module relative to the object, the essence is that the mobile terminal moves relative to the object, and thus the ultrasonic receiving module also moves relative to the object. According to the Doppler effect, the wavelength radiated by an object changes due to the relative motion between the wave source (mobile terminal) and the observer (object). The Doppler effect formula is as follows:

Among them, f' is the observed frequency, f is the original emission frequency emitted from the medium, v is the propagation velocity of the wave in the medium, v ₀ is the moving speed of the observer, if the observer is close to the emission source, the front The operation sign is + sign, otherwise it is - sign; _vs is the moving speed of the emission source, if the object is close to the observer, the front operation sign is - sign, otherwise it is + sign. According to the Doppler effect formula, when the emission source is relatively close to the observer, the frequency of the signal received by the observer will increase; when the emission source is relatively far away from the observer, the frequency of the signal received by the observer will become smaller; When the emission source and the observer are relatively stationary, the frequency of the signal received by the observer is consistent with that of the emission source.

In the embodiment of the present application, the mobile terminal can calibrate the ultrasonic detection function, wherein the ultrasonic detection function can use ultrasonic characteristic values acquired by the mobile terminal to determine the relative movement state between the mobile terminal and the object.

In some embodiments, the mobile terminal calibrates the ultrasonic detection function, which may be to adjust the ultrasonic characteristic value required by the mobile terminal when performing the ultrasonic detection function, so as to determine the relative movement state between the mobile terminal and the object The ultrasonic eigenvalues are more accurate.

In some implementations, the mobile terminal can transmit a fixed-frequency ultrasonic signal through the ultrasonic sending module built in the mobile terminal in a moving state relative to the object. It can be understood that the ultrasonic signal sent by the ultrasonic sending module A part of it propagates through the air and directly reaches the ultrasonic receiving module, and the other part passes through the air and forms a reflection with the occluder to reach the ultrasonic receiving module. signal, wherein the occluder may include a human face, a human body, and the like. For example, a fixed-frequency ultrasonic signal can be sent through a mobile terminal built-in earpiece, speaker, or a dedicated ultrasonic transmitter. Part of the ultrasonic signal propagates through the air and reaches the pickup, and the other part passes through the air and reflects off an obstruction before reaching the pickup. The pickup is What is obtained is the superposition signal of the direct sound and the reflected sound, which is converted into an audio signal through A/D.

In the embodiment of the present application, the relative movement state between the above-mentioned mobile terminal and the object may include a movement speed, a movement direction, and the like. The moving state may be an approaching movement between the mobile terminal and the object at a certain speed, or a moving away between the mobile terminal and the object at a moving speed, which is not limited herein.

In the embodiment of the present application, the mobile terminal can send an ultrasonic signal through the ultrasonic sending module in a moving state relative to the object, and receive the ultrasonic signal returned by the ultrasonic signal after encountering the object through the ultrasonic receiving module, or The ultrasonic signal (reflected sound) returned by the ultrasonic signal after encountering an object is extracted from the ultrasonic signal (direct sound and reflected sound) received by the ultrasonic receiving module, which is not limited here.

Step S120: Obtain ultrasonic characteristic values of the ultrasonic signal during transmission.

In some implementation manners, the mobile terminal can obtain ultrasonic characteristic values during transmission of the ultrasonic signal sent by the ultrasonic sending module. The ultrasonic characteristic value during the transmission of the ultrasonic signal may include a Doppler effect area difference, a Doppler effect area sum, or an absolute value of an ultrasonic amplitude change rate, which is not limited herein.

Step S130: Obtain the difference between the ultrasonic characteristic value and the target characteristic value, the target characteristic value is the characteristic value of the ultrasonic signal detected by the standard terminal in the moving state during transmission.

In the embodiment of the present application, after the mobile terminal obtains the ultrasonic characteristic value of the ultrasonic signal sent in the above-mentioned moving state during the transmission process, it can obtain the ultrasonic signal detected by the standard terminal in a variety of different moving states during the transmission process. Among the multiple eigenvalues, determine the eigenvalue corresponding to the mobile state of the mobile terminal, wherein the various different mobile states of the standard terminal correspond to the multiple eigenvalues one-to-one, that is, each different mobile state corresponds to one eigenvalue. The moving state of the mobile terminal is the moving state in which the mobile terminal moves relative to the object when the mobile terminal is sending and receiving ultrasonic signals in step S110. It can be understood that from the Doppler effect formula, the frequency of the received ultrasonic signal is related to the specific moving state (speed and moving direction) of the sound source relative to the object, so that the mobile terminal and the standard terminal are in different moving states. Ultrasonic characteristic values are different. The standard terminal can be a mobile terminal with the best indicators and parameters, and the accuracy of its ultrasonic detection function is good, which is of reference significance.

In some implementations, the mobile terminal can store multiple characteristic values of the ultrasonic signals detected by the standard terminal in a variety of different moving states during the transmission process, so that the mobile terminal can learn from the multiple moving states of the standard terminal. Among the eigenvalues, determine the eigenvalue corresponding to the mobile state of the mobile terminal, and use the determined eigenvalue as the target eigenvalue.

In some implementations, the mobile terminal can also generate a request for obtaining the target feature value according to its moving state relative to the object, and send the request to the server. A feature value corresponding to a moving state that moves relative to the object is determined from the multiple feature values corresponding to the state, and the determined feature value is sent to the mobile terminal as a target feature value.

In the embodiment of the present application, after the mobile terminal obtains the target feature value, it can calculate the difference between the ultrasonic feature value and the target feature value, and use the calculated difference as the difference between the ultrasonic feature value and the target feature value value, so that the mobile terminal can calibrate the ultrasonic detection function according to the difference value.

In addition, the first transmission parameters (such as transmission intensity, transmission frequency, etc.) of the ultrasonic signal corresponding to the above-mentioned ultrasonic characteristic value are the same as the second transmission parameters of the ultrasonic signal corresponding to the target characteristic value, so that the target characteristic value has strong reference. The first transmitting parameter is when the mobile terminal acquires the ultrasonic characteristic value of the ultrasonic signal in the transmission process, transmits the ultrasonic signal transmission parameter; The transmission parameters of the ultrasonic signal.

Step S140: According to the difference value, adjust the emission intensity of the ultrasonic transmitting module when the mobile terminal is in the moving state each time when it sends an ultrasonic signal, and adjust the emission intensity of the mobile terminal in the moving state every time. Adjust the ultrasonic characteristic value acquired for the first time.

In the embodiment of the present application, when the mobile terminal obtains the difference value, it can know the difference between the ultrasonic characteristic value obtained by the above-mentioned mobile terminal moving relative to the object and the target characteristic value obtained by the standard terminal in the same moving state. The mobile terminal can calibrate the ultrasonic detection function according to the difference value, so that the final ultrasonic characteristic value used by the mobile terminal to determine the moving state of the relative object has high accuracy.

In some implementation manners, the mobile terminal can adjust the emission intensity when sending the ultrasonic signal and the ultrasonic characteristic value obtained each time in the mobile state when the mobile terminal obtains the ultrasonic characteristic value according to the difference value, and compensate The above difference value, so that the final ultrasonic characteristic value used to determine the moving state of the relative object is more accurate.

In some implementations, the mobile terminal adjusts the transmission intensity of the ultrasonic signal and the ultrasonic characteristic value obtained each time when the mobile terminal is in the moving state where the ultrasonic characteristic value is obtained above, and the ultrasonic characteristic value obtained each time. The difference value is split into two parts, one part of the difference value is compensated by adjusting the emission intensity when sending the ultrasonic signal, and the other part of the difference value is compensated by adjusting the acquired ultrasonic characteristic value, so that the final ultrasonic characteristic used to determine the relative object's moving state The value is close to or the same as the target characteristic value obtained by the standard equipment, so as to improve the accuracy of the ultrasonic characteristic value finally used to determine the moving state of the relative object. The ultrasonic characteristic value obtained after calibration is used to determine the moving state of the relative object. Due to its high accuracy, the moving state of the mobile terminal relative to the object determined according to the ultrasonic characteristic value obtained after calibration is also more accurate, improving the mobile terminal based on The moving state of the relative object controls the accuracy of the on-screen and off-screen states of the display.

The ultrasonic calibration method provided in the embodiment of the present application obtains the difference value between the characteristic value of the ultrasonic wave obtained in the same moving state and the characteristic value of the ultrasonic wave obtained by the standard terminal, and according to the difference value, the mobile terminal transmits the ultrasonic wave in the moving state each time. The emission intensity of the signal is adjusted, and the ultrasonic characteristic value acquired each time is adjusted, so that the acquired ultrasonic characteristic value can be calibrated, so that the mobile terminal can detect the moving state between relative objects more accurately. In addition, by adjusting the transmission intensity of the ultrasonic signal to compensate for part of the difference value, it is possible to avoid increasing the power consumption of the mobile terminal, and it also avoids directly using the difference value to compensate the acquired ultrasonic feature value, which affects the relative detection of the mobile terminal. The detection effect of the ultrasonic detection algorithm of the moving state of the object makes the calibration more accurate.

Please refer to FIG. 3 , which shows a schematic flowchart of an ultrasonic calibration method provided in another embodiment of the present application. The method is applied to the above-mentioned mobile terminal. The mobile terminal includes an ultrasonic transmitting module and an ultrasonic receiving module. The process shown in FIG. 3 will be described in detail below. The ultrasonic calibration method may specifically include the following steps:

Step S210: In the mobile state of relative movement between the mobile terminal and the object, send an ultrasonic signal through the ultrasonic transmitting module, and receive an ultrasonic signal returned after the ultrasonic signal encounters the object through the ultrasonic receiving module.

In the embodiment of the present application, for step S210, reference may be made to the content of the foregoing embodiments, which will not be repeated here.

Step S220: Obtain ultrasonic characteristic values of the ultrasonic signal during transmission.

In this embodiment of the present application, the first characteristic value of the ultrasonic signal during transmission may include a Doppler effect area difference, a Doppler effect area sum, or an absolute value of an ultrasonic amplitude change rate, which is not limited herein.

Taking the Doppler effect area difference as an example, the acquisition of the Doppler effect area of the ultrasonic signal during transmission is described. The process of obtaining the Doppler effect area of the ultrasonic signal during transmission may include:

Obtain the sending frequency of the ultrasonic signal sent by the ultrasonic sending module, and the frequency range of the ultrasonic signal received by the ultrasonic receiving module; determine a first frequency change interval and a second frequency change interval based on the sending frequency and the frequency range ; According to the first frequency change interval and the first intensity change curve corresponding to the first frequency change interval, calculate and obtain the first area; according to the second frequency change interval and the second frequency change interval corresponding to the first area Two intensity change curves, calculating the second area; calculating the difference between the first area and the second area to obtain the Doppler effect area difference during the transmission of the ultrasonic signal.

When the mobile terminal is in a call state, the relative motion state of the mobile terminal relative to the object is essentially the process of the user picking up the mobile terminal to get close to or away from the human body during the process of using the mobile terminal. Considering that the user picks up the mobile terminal The speed changes within a certain range, so that the frequency of the ultrasonic signal received by the ultrasonic receiving module also changes within a certain range, that is, the frequency range of the ultrasonic signal.

In some implementations, the mobile terminal can obtain the sending frequency of the ultrasonic signal sent by its built-in ultrasonic sending module, and obtain the frequency range of the ultrasonic signal received by its built-in ultrasonic receiving module. Wherein, the sending frequency of the ultrasonic signal sent by the ultrasonic sending module may be a fixed frequency, therefore, the mobile terminal may obtain the sending frequency based on the set sending parameters of the ultrasonic signal of the ultrasonic sending module. In addition, the frequency range of the ultrasonic signal received by the ultrasonic receiving module is related to the relative motion relationship between the mobile terminal and the object. Therefore, it is possible to obtain the variation range of the movement speed of most users in the process of using the mobile terminal, and based on their movement The variation range of the speed determines the frequency range of the ultrasonic signal received by the ultrasonic receiving module.

Specifically, based on the Doppler effect formula, f' is the frequency of the ultrasonic signal reflected by the object received by the ultrasonic receiving module. f is the sending frequency of the ultrasonic signal sent by the ultrasonic sending module. v is the propagation speed of sound in the air, which is 340m/s. Assuming that the mobile terminal is stationary, then _vs =0. If the moving speed of the object relative to the terminal is v ₀₁ , then the moving speed of the object in the Doppler effect formula is v ₀ =2v ₀₁ . Suppose the sending frequency of the ultrasonic signal sent by the ultrasonic sending module is ultrasonic=22500Hz, and the frequency range of the ultrasonic signal received by the ultrasonic receiving module is [22420Hz, 22580Hz], then the maximum relative speed between the object and the mobile terminal that can be identified according to the Doppler effect for:

If the data length of the Fourier transform (fast Fourier Transform, DFT) transform is fftlen=8192, and the audio data sampling rate is fs=48kHz, then the frequency resolution of the DFT result is:

和式

则能够识别到的物体与移动终端最小相对速度为：

then by the formula

Japanese style

Then the minimum relative speed between the recognized object and the mobile terminal is:

Therefore, in this embodiment, the maximum relative velocity and the minimum relative velocity between the mobile terminal and the object can be obtained based on historical data, etc., and the maximum relative velocity, the minimum relative velocity, and the above formula can be reversely deduced to obtain the ultrasonic waves received by the ultrasonic receiving module The frequency range of the signal.

In some implementations, after acquiring the sending frequency of the ultrasonic signal sent by the ultrasonic sending module and the frequency range of the ultrasonic signal received by the ultrasonic receiving module, the frequency change interval may be determined based on the sending frequency and the frequency range. For example, as shown in Figure 4, Figure 4 shows the audio data spectrogram provided by the embodiment of the present application. The spectrum is the abbreviation of the frequency spectrum, which is the distribution curve of the frequency. leaf transform, in Figure 4, it is a spectrogram obtained by discrete Fourier transform of a piece of audio data, each point on the abscissa corresponds to a frequency value in reality, and the ordinate represents the signal strength of the frequency.

In some embodiments, the feature extraction module uses the data module of length fftlen=8192 to do DFT transformation each time, and obtains the corresponding amplitude-frequency vector X as shown in Figure 4,

The relationship between the actual frequency f _n and the nth data of the amplitude-frequency vector X is as follows:

Among them, f _s is the sampling rate, and fftlen is the data length. Then X[n] represents the strength of the actual frequency f _n .

Suppose the key frequencies considered in the algorithm are ultrasonic=22500Hz, f_min_low=22494Hz, f_min_up=22506Hz, f_low=22420Hz, f_up=22580Hz, then the key frequencies considered are: n1, n2, n3, n4 and n5, n1 is point_low, n2 is point_mid_low, n3 is point_mid, n4 is point_mid_up, n5 is point_up, among them,

As shown in Figure 4, the sending frequency of the ultrasonic signal sent by the ultrasonic sending module is point_mid, the signal strength corresponding to the sending frequency is ultrasonic_amp, the frequency range of the ultrasonic signal received by the ultrasonic receiving module is point_low to point_up, therefore, it can be determined The frequency change range is from point_low to point_mid_low and from point_min-up to point_up.

In some implementations, the first frequency change interval and the second frequency change interval may be determined based on the sending frequency and the frequency range. For example, as shown in FIG. 4 , the first frequency change range is from point_low to point_mid_low, and the second frequency change range is from point_min-up to point_up.

In some implementations, after the frequency change interval is obtained, the intensity change curve corresponding to the frequency change interval can be obtained based on the spectrogram, and based on the frequency change interval and the intensity change curve corresponding to the frequency change interval, the ultrasonic signal can be calculated. The Doppler effect area difference in the process.

Specifically, after the first frequency change interval is obtained, the first intensity change curve corresponding to the first frequency change interval can be obtained based on the spectrogram, and the first intensity change curve corresponding to the first frequency change interval can be obtained based on the first frequency change interval and the first intensity change corresponding to the first frequency change interval. change curve to calculate the first area of the ultrasonic signal during transmission, and at the same time, after obtaining the second frequency change interval, the second intensity change curve corresponding to the second frequency change interval can be obtained based on the spectrogram, and based on the first The second frequency change interval and the second intensity change curve corresponding to the second frequency change interval are used to calculate the second area of the ultrasonic signal during transmission. Further, by calculating the difference between the first area and the second area, for example, subtracting the second area from the first area or subtracting the first area from the second area, the Doppler value of the ultrasonic signal during transmission can be obtained. The effect area is poor.

Similarly, the sum of the Doppler effect area can be obtained by calculating the sum of the first area and the second area.

Taking the absolute value of the ultrasonic amplitude change rate as an example, the acquisition of the absolute value of the ultrasonic amplitude change rate during the transmission of the ultrasonic signal is described. The process of obtaining the absolute value of the ultrasonic amplitude change rate during the transmission of the ultrasonic signal may include:

Obtain the first ultrasonic amplitude corresponding to the ultrasonic signal received by the ultrasonic receiving module, and the second ultrasonic amplitude corresponding to the ultrasonic signal received by the ultrasonic receiving module at the last moment; obtain the first ultrasonic amplitude and the obtained The absolute value of the difference of the second ultrasonic amplitude value is obtained to obtain the absolute value of the ultrasonic amplitude change rate of the ultrasonic signal during transmission.

Wherein, when the first characteristic value includes the absolute value of the ultrasonic amplitude change rate, the mobile terminal can collect the first ultrasonic amplitude corresponding to the ultrasonic signal received by the ultrasonic receiving module at the current moment, and obtain the ultrasonic signal received by the ultrasonic receiving module at the previous moment. Amplitude of the second ultrasonic wave. Wherein, the specific interval between the current moment and the previous moment is not limited, for example, it may be 0.5S, 0.75S and so on. In some embodiments, when the mobile terminal receives the ultrasonic signal through the ultrasonic receiving module, it can record the amplitude of the received ultrasonic signal at each moment.

After the mobile terminal obtains the first ultrasonic amplitude and the second ultrasonic amplitude, it can calculate the difference between the first ultrasonic amplitude and the second ultrasonic amplitude, and take the absolute value of the difference, so as to obtain the ultrasonic signal The absolute value of the rate of change of ultrasonic amplitude during transmission.

Certainly, the specific manner of obtaining the ultrasonic feature value may not be limited in this embodiment of the present application.

Step S230: Obtain the difference between the ultrasonic characteristic value and the target characteristic value, the target characteristic value is the characteristic value of the ultrasonic signal detected by the standard terminal in the moving state during transmission.

In the embodiment of the present application, reference may be made to the contents of the foregoing embodiments for step S230, and details are not repeated here. Wherein, the manner in which the target terminal obtains the characteristic value may be the same as the foregoing manner in which the mobile terminal obtains the ultrasonic characteristic value.

Step S240: Determine whether the absolute value of the difference is greater than a preset threshold.

In the embodiment of the present application, the mobile terminal obtains the sum of the difference between the ultrasonic characteristic value of the ultrasonic signal during the transmission process and the target characteristic value of the standard terminal, and judges whether the absolute value of the difference is greater than the preset threshold value. Determine if calibration is required. If the absolute value of the difference is greater than the preset threshold, it means that the current ultrasonic detection effect of the mobile terminal is not good, that is, the acquired ultrasonic characteristic value is inaccurate, which will affect the accuracy of judging the mobile state of the mobile terminal relative to the object, so follow-up needs Calibrate; and if the absolute value of the difference is less than or equal to the preset threshold, it means that the difference between the currently acquired ultrasonic characteristic value and the target characteristic value is within an acceptable range, so subsequent calibration may not be performed, that is, subsequent step. Wherein, the specific value of the preset threshold may not be used as a limitation, and the preset threshold is related to the specific type of ultrasonic characteristic value, for example, the preset threshold corresponding to the Doppler effect area difference and the preset threshold corresponding to the absolute value of the ultrasonic amplitude change rate The thresholds are different. In addition, since the difference value may be positive, that is, the ultrasonic eigenvalue is greater than the target eigenvalue, the difference value may also be negative, that is, the ultrasonic eigenvalue is smaller than the target eigenvalue, therefore, taking the absolute value of the difference value and comparing it with the preset threshold value can be It reflects the difference between the ultrasonic eigenvalue and the target eigenvalue.

Step S250: If it is greater than the preset threshold, divide the difference value into a first difference value and a second difference value, and the sum of the first difference value and the second difference value is the difference value.

In the embodiment of the present application, if it is determined in step S240 that the absolute value of the difference is greater than a preset threshold, calibration is required. Therefore, according to the difference value, in the moving state of the mobile terminal when acquiring the above-mentioned ultrasonic characteristic value, the emission intensity when sending the ultrasonic signal each time and the ultrasonic characteristic value obtained each time can be adjusted.

In some embodiments, when the mobile terminal adjusts the emission intensity of each ultrasonic signal sent and the ultrasonic characteristic value acquired each time according to the difference value, the difference value can be divided into the first difference value value and the second difference value, and the sum of the first difference value and the second difference value is equal to the difference value. Wherein, the mobile terminal can adjust the ultrasonic characteristic value obtained by the mobile terminal each time in the moving state according to the first difference value, so as to realize the compensation for the first difference value; In the moving state, the transmission intensity of the ultrasonic signal transmitted each time is adjusted to realize compensation for the second difference value.

In some implementations, the part of the difference that needs to be compensated by adjusting the ultrasonic characteristic value acquired each time may account for a preset proportion of the whole difference. The mobile terminal can obtain the product of the difference value and the preset ratio, and use the obtained product as the first difference value; and for the other part of the difference value, the difference obtained by calculating the difference between the difference value and the first difference value is Can be used as the second difference value. Wherein, the specific value of the preset ratio may not be limited. For example, the preset ratio may be 40% to 50%, so that the difference value that needs to be directly compensated by adjusting the ultrasonic characteristic value will not be too large, so as to avoid affecting the ultrasonic detection algorithm. effect; for example, the preset ratio can be 50% to 60%, so that the difference value that needs to be compensated by adjusting the emission intensity will not be too large, and the situation of large power consumption of the mobile terminal will be avoided.

Of course, it can also be that part of the difference value that needs to be compensated by adjusting the ultrasonic characteristic value acquired each time can account for the first proportion of the entire difference value, and another part of the difference value that needs to be compensated by adjusting the emission intensity of the ultrasonic signal transmitted each time can be Accounting for the second proportion of the entire difference value, the sum of the first proportion and the second proportion is 1, the first difference value is obtained by multiplying the difference value by the first proportion, and the difference value is obtained by multiplying the difference value by the second proportion Second difference value.

Step S260: According to the first difference value, adjust the ultrasonic feature value acquired each time by the mobile terminal in the moving state.

In the embodiment of the present application, the mobile terminal adjusts the ultrasonic characteristic value acquired each time in the mobile state according to the first difference value, which may include:

Increasing or decreasing the size of the first difference value of the ultrasonic feature value acquired each time by the mobile terminal in the moving state.

Wherein, if the difference between the ultrasonic characteristic value obtained by the mobile terminal and the target characteristic value is positive, it means that the ultrasonic characteristic value obtained by the mobile terminal in this moving state is greater than the target characteristic value obtained by the standard terminal in this moving state, Therefore, the ultrasonic features acquired by the mobile terminal in the mobile state can be reduced by the first difference value each time to compensate for the first difference value; The acquired ultrasonic features increase the size of the first difference value to compensate for the first difference value.

Step S270: Obtain a target adjustment intensity according to the second difference value, and adjust the emission intensity of the ultrasonic transmitting module when the mobile terminal is in the moving state each time it transmits an ultrasonic signal according to the target adjusted intensity.

In the embodiment of the present application, the mobile terminal adjusts the transmission intensity of the ultrasonic signal sent by the mobile terminal each time in the moving state according to the second difference value, which may be to obtain the target adjustment intensity according to the second difference value, and the target adjustment intensity For the emission intensity that needs to be adjusted each time, the mobile terminal adjusts the target adjustment intensity by adjusting the emission intensity that needs to be sent each time by the ultrasonic emission module in this moving state. Wherein, the target adjustment intensity is obtained by the mobile terminal according to the second difference value, and by adjusting the emission intensity and adjusting the target adjustment intensity, the acquired ultrasonic feature value can compensate for the second difference value.

In some implementation manners, the mobile terminal may calculate the target adjustment strength corresponding to the second difference value according to the corresponding relationship between the transmission intensity of the ultrasonic signal and the transmission frequency, the Doppler effect formula, and the second difference value, Then increase or decrease the target adjustment intensity for each time the ultrasonic transmitting module transmits an ultrasonic signal when the mobile terminal is in the moving state. It can be understood that after the ultrasonic transmitter module transmits the ultrasonic signal, it receives the ultrasonic signal through the ultrasonic receiving module. Calculate the emission frequency corresponding to the second difference value according to the Le effect formula, and then obtain the emission intensity corresponding to the calculated emission frequency through the corresponding relationship between the emission intensity of the ultrasonic signal and the emission frequency. The acquired transmission intensity can be used as the target adjustment intensity, that is to say, the target adjustment intensity can have an impact on the magnitude of the second difference value of the ultrasonic characteristic value, so the target is adjusted by the emission intensity of the ultrasonic signal transmitted by the ultrasonic transmission module each time. By adjusting the intensity, the size of the second difference value can be compensated for the ultrasonic characteristic value. Wherein, when the difference value is positive, the emission intensity of the ultrasonic signal transmitted by the ultrasonic transmitting module can be reduced by the target adjustment intensity, and when the difference value is negative, the emission intensity of the ultrasonic signal transmitted by the ultrasonic transmitting module can be increased each time. Target adjustment strength.

In the embodiment of the present application, the mobile terminal can determine the moving state of the mobile terminal relative to the object by using the ultrasonic detection algorithm according to the ultrasonic characteristic value obtained each time after calibration, so as to control the display screen to be off according to the moving state of the mobile terminal relative to the object. screen status or bright screen status. Wherein, if the moving state of the mobile terminal relative to the object is close state, then the control display screen is in the off state; If the moving state is stationary, the control display will maintain the current display state.

The ultrasonic calibration method provided in the embodiment of the present application obtains the difference value between the ultrasonic characteristic value obtained in the same moving state and the ultrasonic characteristic value obtained by the standard terminal, and divides the difference value into a first difference value and a second difference value. Directly increase or decrease the first difference value of the ultrasonic characteristic value obtained each time when the mobile terminal is in the moving state, so as to realize the compensation for the first difference value of the acquired ultrasonic characteristic value, by placing the mobile terminal in the moving state The transmission intensity of each transmitted ultrasonic signal increases or decreases the target adjustment intensity, so that the adjusted emission intensity has an influence on the size of the second difference value of the ultrasonic characteristic value acquired each time, and realizes the second difference value of the acquired ultrasonic characteristic value. The compensation of the difference value realizes the compensation of the size of the difference value for each acquired ultrasonic characteristic value, so that the ultrasonic characteristic value can be calibrated, so that the mobile terminal can detect the moving state between relative objects more accurately.

Please refer to FIG. 5 , which shows a schematic flowchart of an ultrasonic calibration method provided in another embodiment of the present application. The method is applied to the above-mentioned mobile terminal. The mobile terminal includes an ultrasonic transmitting module and an ultrasonic receiving module. The process shown in FIG. 5 will be described in detail below. The ultrasonic calibration method may specifically include the following steps:

Step S310: In the mobile state of relative movement between the mobile terminal and the object, send an ultrasonic signal through the ultrasonic transmitting module, and receive an ultrasonic signal returned after the ultrasonic signal encounters the object through the ultrasonic receiving module.

Step S320: Obtain ultrasonic characteristic values of the ultrasonic signal during transmission.

Step S330: Obtain the relative moving speed between the mobile terminal and the object.

In the embodiment of the present application, it can be seen from the Doppler effect formula that the frequency of the received ultrasonic signal is related to the moving speed (speed and moving direction) of the sound source relative to the object, so that the mobile terminal and the standard terminal are moving at different moving speeds. , the acquired ultrasonic eigenvalues are different. Therefore, when the mobile terminal obtains the difference value between the ultrasonic characteristic value and the target characteristic value, it can obtain the characteristic value detected by the standard terminal at the relative moving speed through the relative moving speed between the mobile terminal and the object at this time, so as to obtain the standard The target feature value detected by the terminal in the same moving state as the mobile terminal.

In some implementations, the mobile terminal obtains the relative moving speed between the mobile terminal and the object. The mobile terminal may use a built-in acceleration sensor to calculate the moving speed of the mobile terminal according to the relationship between the acceleration detected by the acceleration sensor and time. The calculated moving speed of the mobile terminal is used as a relative moving speed between the mobile terminal and the object. It can be understood that the scene where ultrasonic waves are used to detect the moving state of the mobile terminal relative to the object is used to control the extinguishing and lighting of the display screen when the mobile terminal is talking. Most of the movement between the terminal and the object is that the object is stationary while the mobile terminal moves, so the relative moving speed between the mobile terminal and the object can be determined by detecting the moving speed of the mobile terminal.

Step S340: Calculate the difference between the ultrasonic feature value and the target feature value to obtain the difference value of the mobile terminal in the moving state of the relative moving speed.

In the embodiment of this application, the mobile terminal can determine the above-mentioned The mobile terminal detects the feature value corresponding to the moving state of the relative moving speed, and uses the determined feature value as the target feature value.

Further, by calculating the difference between the ultrasonic feature value obtained by the mobile terminal and the target feature value, the difference value of the mobile terminal in the moving state of the relative moving speed can be obtained.

Step S350: Obtain multiple difference values of the mobile terminal in multiple moving states with different relative moving speeds, wherein the multiple moving states correspond to the multiple difference values one by one.

In some embodiments, the mobile terminal can also obtain multiple difference values in multiple moving states with different relative moving speeds through steps S310 to S340, so that the mobile terminal can use the ultrasonic detection function each time, according to the actual Relative movement speed, select the corresponding difference value to adjust.

Step S360: Obtain the current relative moving speed between the mobile terminal and the object each time the emission intensity of the ultrasonic transmitting module is adjusted and the ultrasonic characteristic value obtained by the mobile terminal is adjusted.

In some embodiments, the mobile terminal can obtain the current relative moving speed between the mobile terminal and the object each time the ultrasonic detection function is calibrated, so that the mobile terminal can select a corresponding difference value according to the actual relative moving speed calibration.

Step S370: Obtain a target difference value corresponding to the movement state of the current relative movement speed from the plurality of difference values.

In some implementations, since there is a one-to-one correspondence between multiple difference values and multiple moving states with different relative moving speeds, the mobile terminal can obtain the corresponding The difference value corresponding to the movement state of the current relative speed, and use the obtained difference value as the target difference value.

In some implementations, the mobile terminal can also record the difference values corresponding to the moving states of different relative moving speeds acquired each time, so as to record the multiple values obtained at different times corresponding to the moving states of each relative moving speed. difference value. The mobile terminal may select all difference values obtained within a period of time corresponding to the current relative moving speed, calculate an average value of all the difference values, and use the average value as the target difference value.

Step S380: According to the target difference value, adjust the emission intensity of the ultrasonic transmitting module when the mobile terminal is in the moving state of the current relative moving speed each time when sending ultrasonic signals, and adjust the The ultrasonic characteristic value acquired each time in the moving state is adjusted.

In the embodiment of the present application, according to the target difference value, the mobile terminal adjusts the emission intensity of the ultrasonic signal transmitted by the ultrasonic transmitting module each time when the mobile terminal is in the moving state of the current relative moving speed, and adjusts the ultrasonic characteristic value obtained each time For the manner of adjustment, reference may be made to the contents of the foregoing embodiments, and details are not repeated here.

In the solution provided by the embodiment of the present application, by obtaining the difference between the ultrasonic characteristic value obtained under different relative moving speeds and the ultrasonic characteristic value obtained by the standard terminal, the mobile terminal can select the same value as the current ultrasonic function when calibrating the ultrasonic function. The target difference value corresponding to the moving state of the relative moving speed, and according to the target difference value, adjust the emission intensity of the ultrasonic signal sent by the mobile terminal in this moving state each time, and adjust the ultrasonic characteristic value obtained each time, so that The acquired ultrasonic characteristic values can be calibrated, so that the mobile terminal can detect the moving state between relative objects more accurately.

Please refer to FIG. 6 , which shows a structural block diagram of an ultrasonic calibration device 400 provided by an embodiment of the present application. The ultrasonic calibration device 400 is applied to the above-mentioned mobile terminal, and the mobile terminal includes an ultrasonic transmitting module and an ultrasonic receiving module. The ultrasonic calibration device 400 includes: a transceiver control module 410 , a feature acquisition module 420 , a difference acquisition module 430 and an adjustment execution module 440 . Wherein, the transceiver control module 410 is used for sending ultrasonic signals through the ultrasonic transmitting module under the moving state of relative movement between the mobile terminal and the object, and receiving the ultrasonic signals through the ultrasonic receiving module when encountering the object. The ultrasonic signal returned afterward; the feature acquisition module 420 is used to acquire the ultrasonic feature value of the ultrasonic signal during transmission; the difference acquisition module 430 is used to acquire the difference value between the ultrasonic feature value and the target feature value, The target feature value is the feature value of the ultrasonic signal detected by the standard terminal in the moving state during the transmission process; the adjustment execution module 440 is used to adjust the mobile terminal in the moving state The following ultrasonic transmitting module adjusts the emission intensity of each ultrasonic signal sent, and adjusts the ultrasonic characteristic value acquired each time by the mobile terminal in the moving state.

In some implementations, the adjustment execution module 440 may include a difference judgment unit and a characteristic value adjustment unit. The difference value judging unit is used to judge whether the absolute value of the difference value is greater than a preset threshold; the characteristic value adjustment unit is used to adjust the When the mobile terminal is in the moving state, the ultrasonic transmitting module adjusts the emission intensity of the ultrasonic signal each time it sends, and adjusts the ultrasonic characteristic value acquired each time when the mobile terminal is in the moving state.

In some implementations, the adjustment execution module 440 may include: a difference value division unit, a first adjustment unit, and a second adjustment unit. The difference value division unit is used to divide the difference value into a first difference value and a second difference value, and the sum of the first difference value and the second difference value is the difference value; the first adjustment unit is used to According to the first difference value, the ultrasonic feature value acquired by the mobile terminal in the moving state is adjusted each time; the second adjustment unit is used to obtain the target adjustment strength according to the second difference value, and according to the target Adjusting the intensity adjusts the emission intensity of the ultrasonic transmitting module when the mobile terminal is in the moving state each time it transmits an ultrasonic signal.

In this embodiment, the second adjustment unit may be specifically configured to: calculate and obtain the second difference value according to the corresponding relationship between the emission intensity of the ultrasonic signal and the emission frequency, the Doppler effect formula, and the second difference value Corresponding target adjustment intensity: increasing or decreasing the target adjustment intensity of the mobile terminal in the moving state when the ultrasonic transmitting module transmits an ultrasonic signal each time.

In this implementation manner, the first adjusting unit may be specifically configured to: increase or decrease the size of the first difference value of the ultrasonic feature value acquired each time by the mobile terminal in the moving state.

In this embodiment, the difference value division unit may be specifically configured to: obtain the product of the difference value and a preset ratio, and use the product as the first difference value; obtain the difference between the difference value and the first difference value A difference value, using the difference value as a second difference value.

In some implementations, the difference acquisition module 430 includes a speed acquisition unit, a feature value selection unit, and a difference value calculation unit. The speed acquisition unit is used to obtain the relative moving speed between the mobile terminal and the object; the characteristic value selection unit is used to obtain the target characteristic value detected by the standard terminal in the moving state of the relative moving speed; difference value calculation The unit is used to calculate the difference between the ultrasonic feature value and the target feature value to obtain the difference value of the mobile terminal in the moving state of the relative moving speed.

In this embodiment, the difference obtaining module 430 is also used to obtain multiple difference values of the mobile terminal in multiple moving states with different relative moving speeds, wherein the multiple moving states and the multiple difference values One to one correspondence.

Further, the adjustment execution module 440 may be specifically configured to: acquire the current distance between the mobile terminal and the object each time the emission intensity of the ultrasonic emission module is adjusted and the characteristic value of the ultrasonic wave obtained by the mobile terminal is adjusted. the current relative moving speed between them; from the plurality of difference values, obtain the target difference value corresponding to the moving state of the current relative moving speed; In the moving state of the speed, the emission intensity of the ultrasonic transmitting module is adjusted each time the ultrasonic signal is sent, and the ultrasonic characteristic value acquired by the mobile terminal in the moving state is adjusted each time.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the devices and modules described above can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In several embodiments provided in the present application, the coupling between the modules may be electrical, mechanical or other forms of coupling.

In addition, each functional module in each embodiment of the present application may be integrated into one processing module, each module may exist separately physically, or two or more modules may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules.

To sum up, in the solution provided by this application, in the moving state between the mobile terminal and the object, the ultrasonic signal is sent through the ultrasonic transmitting module, and the ultrasonic signal is received by the ultrasonic receiving module after the ultrasonic signal encounters the object. , to obtain the ultrasonic eigenvalue of the ultrasonic signal during the transmission process, and to obtain the difference between the ultrasonic eigenvalue and the target eigenvalue, the target eigenvalue is the eigenvalue of the ultrasonic signal detected by the standard terminal in the moving state during the transmission process, according to The difference value is used to adjust the emission intensity of the ultrasonic transmitting module when the mobile terminal is in a moving state each time when it sends an ultrasonic signal. Therefore, according to the difference value between the ultrasonic characteristic value acquired in the same moving state and the ultrasonic characteristic value obtained by the standard terminal, the mobile terminal is in this moving state. The ultrasonic eigenvalues used for proximity detection are adjusted so that the acquired ultrasonic eigenvalues can be calibrated, so that the mobile terminal can detect the moving state between relative objects more accurately.

Please refer to FIG. 7 , which shows a structural block diagram of a mobile terminal provided by an embodiment of the present application. The mobile terminal 100 may be a mobile terminal capable of running application programs, such as a smart phone, a tablet computer, and an e-book. The mobile terminal 100 in this application may include one or more of the following components: a processor 110, a memory 120, a display screen 130, an ultrasonic sending module 140, an ultrasonic receiving module 150, and one or more application programs, wherein one or more application programs Programs may be stored in the memory 120 and configured to be executed by one or more processors 110, and one or more programs are configured to perform the methods described in the foregoing method embodiments.

Processor 110 may include one or more processing cores. The processor 110 uses various interfaces and lines to connect various parts in the entire mobile terminal 100, and executes by running or executing instructions, programs, code sets or instruction sets stored in the memory 120, and calling data stored in the memory 120. Various functions and processing data of the mobile terminal 100. Optionally, the processor 110 may use at least one of Digital Signal Processing (Digital Signal Processing, DSP), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), and Programmable Logic Array (Programmable LogicArray, PLA). implemented in the form of hardware. The processor 110 may integrate one or a combination of a central processing unit (Central Processing Unit, CPU), an image processor (Graphics Processing Unit, GPU), a modem, and the like. Among them, the CPU mainly handles the operating system, user interface and application programs, etc.; the GPU is used to render and draw the displayed content; the modem is used to handle wireless communication. It can be understood that, the above-mentioned modem may also not be integrated into the processor 110, but implemented by a communication chip alone.

The memory 120 may include a random access memory (Random Access Memory, RAM), and may also include a read-only memory (Read-Only Memory). The memory 120 may be used to store instructions, programs, codes, sets of codes, or sets of instructions. The memory 120 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system and instructions for implementing at least one function (such as a touch function, a sound playback function, an image playback function, etc.) , instructions for implementing the following method embodiments, and the like. The storage data area can also store data created by the terminal 100 during use (such as phonebook, audio and video data, chat record data) and the like.

The display screen 130 is used to display information input by the user, information provided to the user, and various graphical user interfaces of the mobile terminal 100. These graphical user interfaces can be composed of graphics, text, icons, numbers, videos, and any combination thereof. In one example, the display screen 130 may be a liquid crystal display (Liquid Crystal Display, LCD) or an organic light-emitting diode (Organic Light-Emitting Diode, OLED), which is not limited herein.

The ultrasonic emitting module 140 is used for emitting ultrasonic waves. The ultrasonic emitting device module 140 may be an earpiece, a horn, a dedicated ultrasonic emitter, etc., which is not limited here. The ultrasonic receiving module 150 is used for receiving ultrasonic waves. The ultrasonic receiving device module 150 may be a sound pickup or the like, which is not limited here.

Please refer to FIG. 8 , which shows a structural block diagram of a computer-readable storage medium provided by an embodiment of the present application. Program codes are stored in the computer-readable medium 800, and the program codes can be invoked by a processor to execute the methods described in the foregoing method embodiments.

The computer readable storage medium 800 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), EPROM, hard disk, or ROM. Optionally, the computer-readable storage medium 800 includes a non-transitory computer-readable storage medium (non-transitory computer-readable storage medium). The computer-readable storage medium 800 has a storage space for program code 810 for executing any method steps in the above-mentioned methods. These program codes can be read from or written into one or more computer program products. Program code 810 may, for example, be compressed in a suitable form.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not drive the essence of the corresponding technical solutions away from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims (7)

1. An ultrasonic calibration method is applied to a mobile terminal, wherein the mobile terminal comprises an ultrasonic transmitting module and an ultrasonic receiving module, and the method comprises the following steps:

in a moving state of relative movement between the mobile terminal and an object, sending an ultrasonic signal through the ultrasonic transmitting module, and receiving an ultrasonic signal returned by the ultrasonic signal after encountering the object through the ultrasonic receiving module;

acquiring an ultrasonic characteristic value of an ultrasonic signal in a transmission process;

acquiring the relative movement speed between the mobile terminal and an object;

acquiring a target characteristic value of the ultrasonic signal detected by the standard terminal in the moving state of the relative moving speed in the transmission process;

calculating the difference value between the ultrasonic characteristic value and the target characteristic value to obtain the difference value of the mobile terminal in the moving state of the relative moving speed;

and adjusting the transmitting intensity of the mobile terminal in the moving state when the ultrasonic transmitting module transmits the ultrasonic signal every time, and adjusting the ultrasonic characteristic value acquired by the mobile terminal in the moving state every time according to the difference value.

2. The method according to claim 1, wherein the adjusting, according to the difference value, the transmission intensity of the ultrasonic wave transmission module each time when the ultrasonic wave signal is transmitted by the mobile terminal in the moving state and the ultrasonic wave characteristic value obtained by the mobile terminal each time in the moving state comprises:

judging whether the absolute value of the difference value is larger than a preset threshold value or not;

if the difference value is larger than the preset threshold value, adjusting the transmitting intensity of the ultrasonic transmitting module in the moving state every time when the ultrasonic signal is transmitted by the mobile terminal according to the difference value, and adjusting the ultrasonic characteristic value obtained by the mobile terminal in the moving state every time.

3. The method of claim 1, further comprising:

the method comprises the steps of obtaining a plurality of difference values of the mobile terminal in a plurality of moving states with different relative moving speeds, wherein the plurality of moving states correspond to the plurality of difference values one to one.

4. The method according to claim 3, wherein the adjusting, according to the difference value, the transmission intensity of the ultrasonic wave transmission module each time when the ultrasonic wave signal is transmitted by the mobile terminal in the moving state and the ultrasonic wave characteristic value obtained by the mobile terminal each time in the moving state comprises:

when the transmitting intensity of the ultrasonic transmitting module is adjusted and the ultrasonic characteristic value obtained by the mobile terminal is adjusted each time, the current relative moving speed between the mobile terminal and an object is obtained;

acquiring a target difference value corresponding to the moving state of the current relative moving speed from the plurality of difference values;

and adjusting the transmitting intensity of the ultrasonic transmitting module each time when the ultrasonic signal is transmitted by the mobile terminal in the moving state of the current relative moving speed according to the target difference value, and adjusting the ultrasonic characteristic value acquired by the mobile terminal each time in the moving state.

5. An ultrasonic calibration device, characterized in that, be applied to mobile terminal, mobile terminal includes ultrasonic wave emission module and ultrasonic wave receiving module, the device includes: a receiving and sending control module, a characteristic acquisition module, a difference acquisition module and an adjustment execution module, wherein the difference acquisition module comprises a speed acquisition unit, a characteristic value selection unit and a difference value calculation unit,

the receiving and transmitting control module is used for sending an ultrasonic signal through the ultrasonic transmitting module in a moving state that the mobile terminal and an object move relatively, and receiving an ultrasonic signal returned by the ultrasonic signal after encountering the object through the ultrasonic receiving module;

the characteristic acquisition module is used for acquiring ultrasonic characteristic values of ultrasonic signals in a transmission process;

the speed acquisition unit is used for acquiring the relative moving speed between the mobile terminal and the object;

the characteristic value selection unit is used for acquiring a target characteristic value of the ultrasonic signal detected by the standard terminal in the moving state of the relative moving speed in the transmission process;

the difference value calculating unit is used for calculating the difference value between the ultrasonic characteristic value and the target characteristic value to obtain the difference value of the mobile terminal in the moving state of the relative moving speed;

the adjustment execution module is used for adjusting the emission intensity of the mobile terminal in the moving state when the ultrasonic emission module sends the ultrasonic signal each time according to the difference value, and adjusting the ultrasonic characteristic value obtained by the mobile terminal in the moving state each time.

6. A mobile terminal, comprising:

one or more processors;

a memory;

one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, the one or more programs configured to perform the method of any of claims 1-4.

7. A computer-readable storage medium, having stored thereon program code that can be invoked by a processor to perform the method according to any one of claims 1 to 4.

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