CN113820064A - Method and device for measuring air pressure by using loudspeaker, terminal equipment and storage medium - Google Patents
Method and device for measuring air pressure by using loudspeaker, terminal equipment and storage medium Download PDFInfo
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- CN113820064A CN113820064A CN202110893209.5A CN202110893209A CN113820064A CN 113820064 A CN113820064 A CN 113820064A CN 202110893209 A CN202110893209 A CN 202110893209A CN 113820064 A CN113820064 A CN 113820064A
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- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
Abstract
The invention discloses a method, a device, terminal equipment and a storage medium for measuring air pressure by using a loudspeaker, which are used for carrying out air pressure measurement on a mobile terminal and initializing the air pressure measurement state of the loudspeaker of the mobile terminal, wherein the mobile terminal receives the air pressure from an external environment through a loudspeaker diaphragm, the loudspeaker diaphragm drives a loudspeaker voice coil to move in a magnetic field under the action of the air pressure of the external environment, and the mobile terminal obtains induced electromotive force on the loudspeaker voice coil to calculate the air pressure value of the external environment. The invention utilizes the existing components of the electronic product to slightly improve the function, namely can be used for replacing an MEMS air pressure sensor to realize the function of measuring the air pressure, explores a new application for the common components of the electronic product and simultaneously reduces the cost of the product.
Description
Technical Field
The invention relates to the technical field of metering of mobile terminals, in particular to a method and a device for measuring air pressure by using a loudspeaker, terminal equipment and a storage medium.
Background
Today of science and technology assisted life, people and various mobile terminal devices such as the movie have been surrounded by mobile terminal devices such as cell-phones, flat boards in the life for a long time, and the mobile terminal devices have slowly permeated into all corners of people's life. Various functions on the mobile terminal device are increasing, such as the functions of measuring the length and height of an object through a mobile phone, or measuring the heartbeat, blood pressure and other health indexes of a human body. In addition, with the improvement of the intelligent degree of the mobile phone, the function of the barometer is also applied to electronic products such as mobile terminal devices more and more frequently, so as to meet the special requirements of the mobile terminal devices, especially the mobile phone users, on the application scenes such as the altitude, the water depth and the like of the geographical positions, and further improve the function application range of the mobile phone. At present, because of the implementation of FCCE911 regulations, the mobile phone in the us market needs to adopt the barometer function to realize the requirement of vertical positioning, and thus, with the gradual implementation of the regulations, domestic applications in the aspects will be gradually popularized and developed. At present, the industry generally adopts a built-in MEMS (micro electro mechanical system) pressure sensor in the mobile phone to realize the function of measuring the pressure of the mobile phone, and the MEMS pressure sensor can assist the mobile phone to track and acquire the height of the user and assist the tracking calculation.
Although the MEMS pressure sensor can be easily integrated into a mobile terminal device, the mobile terminal device such as a mobile phone has new functions added thereto, but occupies an inner space. Therefore, the purpose of measuring the air pressure is achieved by using the existing functions of the mobile phone under the condition of not adding new hardware, so that the utilization space of the mobile phone is improved.
Thus, there is a need for improvements and enhancements in the art.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for measuring air pressure by using a speaker sealed sound cavity to realize dynamic air pressure measurement of a mobile terminal device, solve the problem that an MEMS air pressure sensor is required to be used for air pressure measurement, and meet the scene application requirements of the mobile terminal device for applying air pressure measurement, aiming at the above defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a method for measuring air pressure by using a speaker, wherein the method comprises the following steps:
initializing a loudspeaker air pressure measuring state of the mobile terminal;
the mobile terminal receives air pressure from the external environment through a loudspeaker diaphragm;
the loudspeaker diaphragm drives the loudspeaker voice coil to move in the magnetic field under the action of the air pressure of the external environment;
and the mobile terminal acquires the induced electromotive force on the loudspeaker voice coil so as to calculate the air pressure value of the external environment.
As a further improved technical solution, the initializing the speaker air pressure measurement state of the mobile terminal specifically includes the following steps:
embedding a loudspeaker of the mobile terminal into the cavity to form a closed sound cavity;
enabling the loudspeaker diaphragm to be in a static suspension state;
and acquiring the initial air pressure value of the closed sound cavity and setting the air pressure value to be P0.
As a further improved technical solution, initializing the speaker air pressure measurement state of the mobile terminal specifically includes the following steps:
acquiring the magnetic field intensity B of the loudspeaker magnetic steel;
acquiring the length L and the resistance R of the voice coil of the loudspeaker;
and acquiring the area S of the loudspeaker diaphragm.
As a further improved technical solution, the step of driving the speaker voice coil to move in the magnetic field under the action of pressure by the speaker diaphragm specifically includes the following steps:
two ends of the loudspeaker voice coil are electrically conducted;
the loudspeaker diaphragm drives the loudspeaker voice coil to move in the magnetic field generated by the loudspeaker magnetic steel, and obtains the electromagnetic acting force Fb generated by the loudspeaker voice coil cutting magnetic field.
As a further improved technical solution, the step of obtaining the induced electromotive force on the voice coil of the speaker by the mobile terminal to calculate the air pressure value of the external environment specifically includes the following steps:
when the loudspeaker diaphragm drives the loudspeaker voice coil to move in the magnetic field generated by the magnetic steel, the induced electromotive force U generated by the loudspeaker voice coil cutting magnetic field is obtained;
the mobile terminal calculates the air pressure value P of the external environment according to the formula P0+ (B × U × L)/(R × S).
As a further improved technical solution, the obtaining of the induced electromotive force generated by the loudspeaker voice coil cutting magnetic field is obtained by performing ADC sampling on voltages of the positive and negative poles of the loudspeaker.
In a second aspect, an embodiment of the present invention further provides an apparatus for measuring air pressure by using a speaker, where the apparatus includes:
the air pressure measurement state initialization module is used for initializing the air pressure measurement state of the loudspeaker of the mobile terminal;
the loudspeaker voice coil induced electromotive force sampling module is used for driving the loudspeaker voice coil to move in a magnetic field under the action of air pressure of an external environment on the loudspeaker voice coil according to a loudspeaker vibrating diaphragm so as to obtain induced electromotive force generated by the loudspeaker voice coil cutting the magnetic field;
and the air pressure value calculation module calculates the air pressure value of the external environment according to the magnetic field intensity of the loudspeaker magnetic steel, the length and the resistance of the loudspeaker voice coil and the area of the loudspeaker diaphragm and the induced electromotive force.
As a further improved technical solution, the apparatus further comprises:
and the voltage sampling module is used for carrying out ADC sampling on the voltages of the positive pole and the negative pole of the loudspeaker, namely the induced electromotive force of the voice coil of the loudspeaker.
In a third aspect, an embodiment of the present invention further provides a terminal device, where the terminal device includes a memory, a processor, and a program stored in the memory and executable on the processor and configured to measure air pressure by using a speaker, where when the processor executes the program for measuring air pressure by using the speaker, the steps of the method for measuring air pressure by using the speaker according to any one of the above schemes are implemented.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a program for measuring air pressure using a speaker is stored, and when the processor executes the program for measuring air pressure using the speaker, the processor implements the steps of any one of the above methods for measuring air pressure using the speaker.
Has the advantages that: compared with the prior art that when the electronic product needs to measure the air pressure, the air pressure meter is additionally provided with an MEMS (micro electro mechanical systems), the invention provides a technical scheme for calculating the pressure value of the electronic product by utilizing the closed sound cavity of the loudspeaker and detecting the induced electromotive force generated after the loudspeaker diaphragm is driven to cut in the magnetic field under the action of the external pressure of the voice coil of the loudspeaker, so as to measure the air pressure. The loudspeaker is an indispensable component on a plurality of electronic products, the existing components of the electronic products are utilized, the function is slightly improved, the loudspeaker can be used for replacing an MEMS air pressure sensor to realize the function of measuring air pressure, a new application is developed for common components of the electronic products, and meanwhile, the product cost is also reduced.
Drawings
Fig. 1 is a flowchart of an embodiment of a method for measuring air pressure by using a speaker according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a structure of a speaker sealed cavity in the method for measuring air pressure by using a speaker according to the embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a circuit for detecting an induced electromotive force in a method for measuring air pressure using a speaker according to an embodiment of the present invention.
Fig. 4 is a schematic block diagram of an apparatus for measuring air pressure using a speaker according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Today, people and various terminal devices such as videos and videos are surrounded by mobile terminal devices such as mobile phones and tablets in life. Mobile terminal devices have slowly penetrated into the corners of people's lives. Among them, mobile terminal devices such as mobile phones are more essential for life of people. With the advance of technology, mobile terminal devices have no longer been used as mobile portable telephones or short message displays, and have become important tools for people to carry with them, such as communication devices, information centers, memories, navigators, clocks, perpetual calendars, cameras and the like. In order to continuously develop various application scenarios of the mobile terminal device, the mobile terminal device also needs to continuously accumulate functional devices to meet the requirements of the continuously developed application scenarios, for example, taking a mobile phone of the mobile terminal device as an example, when a user of the mobile phone needs to measure the altitude, the water depth and other conditions of the geographic location, or when the mobile phone plays games, different functional devices need to be accumulated to realize various functions. In addition, with the promotion of FCCE911 regulations in the U.S. market, the positioning requirement of the mobile phone in the vertical direction needs to be realized by adopting the function of a barometer, and it is believed that the application will be popularized in China in the near future, so that the function of providing the mobile phone with the function of measuring the air pressure is also a necessary function of the equipment.
Currently, the commonly adopted industry is to embed an MEMS (micro electro mechanical system) pressure sensor in the mobile phone to realize the function of measuring the mobile phone pressure. Although the MEMS pressure sensor can be easily integrated into a mobile terminal device such as a cellular phone, it requires additional installation space and also increases the cost of the cellular phone.
In order to solve the problems in the prior art, the embodiment provides a function of measuring the gas pressure on a mobile terminal device such as a mobile phone without additionally adding components.
The loudspeaker is a common electroacoustic sensor, can convert an electric signal into a sound type, and is widely applied to various electronic products. When the loudspeaker works, an electric signal flows through the loudspeaker voice coil, the loudspeaker voice coil is acted by ampere force in a magnetic field generated by loudspeaker magnetic steel, the ampere force refers to acting force of a power-on lead in the magnetic field, the ampere force Fa is B multiplied by I multiplied by L, wherein B is the magnetic field intensity, I is the current on the lead, and L is the lead length. Because the loudspeaker diaphragm is connected as an organic whole with the speaker voice coil loudspeaker voice coil to hang in the magnetic field that speaker magnet steel produced, when the signal of telecommunication was through the speaker voice coil loudspeaker diaphragm will vibrate from top to bottom under the ampere force effect, thereby promote the air vibration, produce the sound wave signal. The sound wave above the loudspeaker diaphragm and the sound wave below the loudspeaker diaphragm are directional signals, and a phase difference of 180 degrees exists. In order to avoid the acoustic signals above and below the loudspeaker diaphragm from being offset to each other, which results in sound attenuation, a closed sound cavity is needed to isolate the upper and lower acoustic signals of the loudspeaker diaphragm, so as to accurately reflect the ampere force of the loudspeaker diaphragm driving the loudspeaker voice coil to vibrate in the magnetic field generated by the loudspeaker magnetic steel. Therefore, the present invention adopts a method of sealing a speaker to form a sealed cavity, as shown in fig. 2, fig. 2 shows a schematic cross-sectional view of a structure of the sealed cavity of the speaker in the method of measuring air pressure by using the speaker according to the embodiment of the present invention, the speaker 10 is sealed in the cavity 108, that is, the speaker 10 is placed in an opening of the cavity 108, the periphery of the speaker 10 is connected and sealed with the periphery of the opening of the cavity 108, and after the speaker 10 is embedded in the cavity, the back of the speaker 10 and the cavity 108 form a sealed sound cavity 109. As a closed cavity, the loudspeaker diaphragm 101 will vibrate up and down under the action of the pressure of the external environment, because the loudspeaker 10 is a closed cavity, the sound wave signal above the loudspeaker diaphragm 101 propagates outwards, and the sound wave signal below is closed in the closed sound cavity 109 and cannot propagate outwards, so as to avoid the cancellation of the sound wave signal, because the sound wave signals in the up-and-down direction of the loudspeaker diaphragm 101 are prevented from canceling each other, so that the loudspeaker diaphragm 101 driving the loudspeaker voice coil 102 can accurately reflect the acting force of the loudspeaker voice coil 102 cutting motion in the magnetic field of the loudspeaker magnetic steel 103, at this time, when the loudspeaker diaphragm 101 is subjected to the air pressure of the external environment and drives the loudspeaker voice coil 102 to vibrate, by detecting the induced electromotive force on the loudspeaker voice coil 102, i.e. detecting the voltages of the positive and negative poles of the loudspeaker 10, the external air pressure value of the mobile terminal device can be calculated according to the induced electromotive force on the loudspeaker voice coil 102, and is used in various application scenarios where the mobile terminal device needs to use the barometric pressure value.
Fig. 3 shows a schematic circuit diagram of the method for measuring air pressure by using a speaker according to the embodiment of the present invention, as shown in fig. 3, the positive and negative terminals of the speaker 10 having a sealed cavity are electrically connected to an amplifier 20, the amplifier 20 is electrically connected to an ADC 30, and the ADC 30 is electrically connected to a processor 40. Wherein the amplifier 20 is a device capable of amplifying the voltage or power of an input signal to increase the amplitude or power of the signal; the ADC 30(Analog to digital converter, ADC) is an electronic component for converting an Analog signal into a digital signal, and is a component for converting an input voltage signal into an output digital signal, and the processor 40 refers to a central processing unit (central processing unit) on the mobile terminal device, and is a core of operation and control of the mobile terminal device, and is a final execution unit for information processing and program operation. The amplifier 20, the ADC 30 and the processor 40 are all the prior art in mobile terminal devices, and the detailed working principle thereof is not described in detail. After the signals are amplified by the amplifier 20, the voltages at the positive and negative terminals of the speaker are converted into digital signals by the ADC module 30, and then the digital signals are input to the processor 40 of the mobile terminal, and the processor 40 of the mobile terminal calculates an external air pressure value according to a relationship between the induced electromotive force and the external environment pressure, and then feeds the external air pressure value back to a user of the mobile terminal device, thereby implementing the function of measuring air pressure by using the speaker. From the working principle of the air pressure measurement, the accuracy of the air pressure measurement mainly depends on the measurement accuracy of the induced electromotive force, so that in a circuit for detecting the induced electromotive force, the signal gain of an amplifier and the sampling accuracy of an ADC analog-to-digital conversion module determine the accuracy of the air pressure measurement.
The following describes the process of the implementation method in detail according to the working principle of the above-mentioned mobile terminal device using a speaker to measure the air pressure.
Exemplary method
The method for measuring air pressure by using the loudspeaker can be applied to mobile terminal equipment, such as mobile phone, tablet personal computer and other mobile terminal equipment, and the method can be implemented by various mobile terminal equipment with the loudspeaker. It is understood that the specific method steps are shown with reference to the steps of fig. 1, and the method for measuring air pressure by using a speaker includes the following steps S100 to S400:
step S100, initializing the air pressure measuring state of the loudspeaker of the mobile terminal.
The purpose of initialization is to acquire the known parameters of the loudspeaker in the mobile terminal related to the measured air pressure in a non-operating and static state.
The initializing the speaker air pressure measurement state of the mobile terminal specifically includes the following steps S101 to S103:
and S101, embedding a loudspeaker of the mobile terminal into the cavity to form a closed sound cavity. Like the theory of operation of preceding speaker measurement atmospheric pressure, mobile terminal utilizes the speaker to carry out the measurement of atmospheric pressure, when needing to prevent that the speaker vibrating diaphragm from receiving the vibration, the mutual offset when speaker vibrating diaphragm top sound wave signal and below sound wave signal toward outer broadcast to can't acquire the induced electromotive force of the speaker voice coil loudspeaker voice coil vibration of being connected with the speaker vibrating diaphragm, consequently, need seal the speaker in airtight cavity, make speaker vibrating diaphragm top sound wave signal and below sound wave signal can't offset each other, thereby can measure the induced electromotive force of speaker voice coil loudspeaker voice coil after receiving the vibration. The above-mentioned sound wave signals above and below the loudspeaker diaphragm refer to the sound wave signals that are upward in the vertical direction or downward in the vertical direction of the loudspeaker diaphragm in the horizontal placement state of the loudspeaker as shown in fig. 2, that is, the sound wave signals above are the sound wave signals of the loudspeaker facing the outside of the sealed sound cavity, and the sound wave signals below are the sound wave signals of the loudspeaker facing the inside of the sealed sound cavity. Here, the upper acoustic signal and the lower acoustic signal are not limited to the direction of the acoustic signal transmitted by the speaker, but are only used to indicate different propagation directions of the acoustic signal of the speaker, and according to the acoustic signal relative to the sealed cavity, the upper acoustic signal may also be referred to as an outward acoustic signal, and the lower acoustic signal may also be referred to as an inward acoustic signal.
And S102, enabling the loudspeaker diaphragm to be in a static suspension state. The suspension state that the loudspeaker diaphragm is in standing is a state that the loudspeaker diaphragm is placed above the loudspeaker magnetic steel and the loudspeaker does not work. The loudspeaker diaphragm is connected with the loudspeaker voice coil, the loudspeaker voice coil is a coil of the loudspeaker through current, the loudspeaker voice coil is an important component of an electrodynamic loudspeaker mechanical wave system, the heart of the loudspeaker can be said, the performance of the voice coil can influence the sound intensity characteristic of the loudspeaker, and the loudspeaker voice coil generally adopts materials with light weight and strong sensitivity, so that the loudspeaker is used for measuring air pressure and the measuring precision is improved.
And step S103, acquiring an initial air pressure value of the closed sound cavity and setting the air pressure value as P0. When the speaker did not work, when the speaker vibrating diaphragm was in the state of stewing promptly, measure the initial atmospheric pressure value of airtight sound chamber and record for P0 under this state, the initial atmospheric pressure value of airtight sound chamber under the record speaker vibrating diaphragm state of stewing, the difference between the atmospheric pressure under the follow-up speaker vibrating diaphragm of aim at and the speaker vibrating diaphragm state of stewing when receiving external environment pressure, the external environment's that the accurate speaker received pressure is calculated to obtain the external environment's that mobile terminal received pressure.
In addition, the initializing the speaker air pressure measurement state of the mobile terminal specifically includes the following steps:
acquiring the magnetic field intensity B of the loudspeaker magnetic steel;
acquiring the length L and the resistance R of the voice coil of the loudspeaker;
and acquiring the area S of the loudspeaker diaphragm.
Particularly, different mobile terminal has probably adopted not unidimensional speaker, the variation in size of each speaker, its speaker vibrating diaphragm, speaker magnet steel, the index parameter of speaker voice coil loudspeaker voice coil is all inequality, because the speaker variation in size, the pressure size that its speaker vibrating diaphragm received is also different, at the initialized in-process, still need acquire the magnetic field intensity B of above-mentioned speaker magnet steel, magnetic field intensity B' S size has decided the cutting effort size of speaker voice coil loudspeaker voice coil in the magnetic field that speaker magnet steel produced, the size of induced electromotive force when speaker voice coil loudspeaker voice coil has been decided to length L and resistance R of speaker voice coil loudspeaker voice coil through-current, the size of speaker atress has been decided to the area S of speaker vibrating diaphragm. Therefore, the initialization process needs to obtain the related technical parameter values of the speaker assembly, so as to accurately calculate the magnitude of the pressure value of the external environment to which the speaker is subjected in the following process.
And step S200, the mobile terminal receives air pressure from the external environment through a loudspeaker diaphragm.
Specifically, after the speaker air pressure measurement state is initialized, the mobile terminal speaker may receive air pressure from the external environment, and then start the measurement operation. As mentioned above, the loudspeaker diaphragm acts in the magnetic field generated by the loudspeaker magnetic steel, thereby driving the loudspeaker voice coil to perform cutting motion in the magnetic field generated by the loudspeaker magnetic steel. In this step, the mobile terminal receiving the air pressure from the external environment through the loudspeaker diaphragm means that the mobile terminal is used as an inlet for receiving the external environment pressure when the mobile terminal starts to measure the external environment air pressure, and the loudspeaker diaphragm is used as a sensing device of the mobile terminal device.
And step S300, the loudspeaker diaphragm drives the loudspeaker voice coil to move in the magnetic field under the action of the air pressure of the external environment.
As mentioned earlier, the loudspeaker vibrating diaphragm is connected with the loudspeaker voice coil, and mobile terminal receives external environment's pressure effect for the loudspeaker vibrating diaphragm drives the loudspeaker voice coil up-and-down motion, cuts the motion in the magnetic field that the speaker magnet steel produced, when the loudspeaker voice coil cuts the line of magnetic induction with certain speed in the magnetic field, can produce induced voltage in the loudspeaker voice coil inside, also induced electromotive force, its direction accords with the right-hand rule. At this time, the voice coil of the speaker is the initial role of the damping and the receiver of the damping.
Specifically, the step of driving the speaker voice coil to move in the magnetic field under the action of pressure by the speaker diaphragm specifically includes the following steps S301 to S302:
step S301, conducting and connecting two ends of a voice coil of the loudspeaker; the loudspeaker diaphragm drives the loudspeaker voice coil to move in the magnetic field, and the induced voltage generated by the loudspeaker voice coil needs to be acquired, so that the conduction of the positive and negative electrodes at two ends of the loudspeaker voice coil is needed. Referring to the schematic diagram of the circuit for detecting the induced electromotive force in the method for measuring air pressure by using a speaker according to the embodiment of the present invention shown in fig. 3, the principle of the conduction connection of the two ends of the voice coil of the speaker in this step is that the two ends of the positive electrode and the negative electrode of the speaker in the sealed cavity in the method according to the embodiment of the present invention are connected to the two ends of the voice coil of the speaker, and are used for measuring the induced electromotive force generated by the voice coil of the speaker, that is, the induced voltage of the voice coil of the speaker.
And S302, the loudspeaker diaphragm drives the loudspeaker voice coil to move in the magnetic field generated by the loudspeaker magnetic steel, and the electromagnetic acting force Fb generated by the loudspeaker voice coil cutting magnetic field is obtained.
Specifically, the electromagnetic acting force Fb generated by the loudspeaker voice coil cutting magnetic field refers to an acting force applied to the loudspeaker voice coil in the magnetic field generated by the loudspeaker magnetic steel, that is, in the aforementioned working principle of the loudspeaker, the loudspeaker voice coil is applied with an ampere force, the ampere force refers to an acting force applied to the energizing wire in the magnetic field, that is, the loudspeaker voice coil in the loudspeaker, according to the above-mentioned ampere force formula Fa ═ B × I × L, in this step, the electromagnetic acting force Fb generated by the loudspeaker voice coil cutting magnetic field is ═ B × (U/R) × L, where B is the magnetic field strength of the magnetic field generated by the loudspeaker magnetic steel, U is the induced voltage of the loudspeaker voice coil, that is, the induced electromotive force of the loudspeaker voice coil, R is the resistance of the loudspeaker, and L is the length of the loudspeaker voice coil.
And step S400, the mobile terminal obtains the induced electromotive force on the voice coil of the loudspeaker so as to calculate the air pressure value of the external environment.
The step of obtaining the induced electromotive force on the voice coil of the loudspeaker by the mobile terminal to calculate the air pressure value of the external environment specifically comprises the following steps:
when the loudspeaker diaphragm drives the loudspeaker voice coil to move in the magnetic field generated by the magnetic steel, the induced electromotive force U generated by the loudspeaker voice coil cutting magnetic field is obtained;
the mobile terminal calculates the air pressure value P of the external environment according to the formula P0+ (B × U × L)/(R × S).
Specifically, the loudspeaker diaphragm is under the atmospheric pressure P effect of external environment, and at this moment, the loudspeaker diaphragm will receive pressure F, F ═ is (P-P0) × S, and the loudspeaker diaphragm will drive the loudspeaker voice coil to make cutting motion in the magnetic field that the speaker magnet steel produced under pressure F' S effect, and when the electromagnetic force Fb that the loudspeaker voice coil cutting magnetic field produced was equal with pressure F, the loudspeaker diaphragm reacquires the balance.
Therefore, according to the aforementioned ampere force formula Fa ═ B × I × L ═ B × (U/R) × L, and F ═ Fa, P0+ (B × U × L)/(R × S) can be obtained, where P0 is the initial air pressure of the speaker enclosure voice coil, B is the magnetic field strength of the magnetic field generated by the speaker magnetic steel, L is the length of the speaker voice coil, R is the resistance value of the speaker voice coil, and S is the area of the speaker diaphragm, and all of them are known physical quantities. The pressure value P of the external environment can be calculated according to the formula by detecting the induced electromotive force U of the voice coil of the loudspeaker.
The induced electromotive force generated by the cutting magnetic field of the voice coil of the speaker is obtained by performing ADC sampling on the voltages of the positive and negative poles of the speaker, and the specific working principle is the same as the description of the circuit principle for detecting the induced electromotive force of the voice coil of the speaker in combination with fig. 3, which is not repeated herein.
Exemplary device
As shown in fig. 4, an embodiment of the present invention provides an apparatus for measuring air pressure using a speaker, including:
and an air pressure measurement state initialization module 50, configured to initialize a speaker air pressure measurement state of the mobile terminal.
The purpose of initialization is to acquire the known parameters of the loudspeaker in the mobile terminal related to the measured air pressure in a non-operating and static state. Specifically, a loudspeaker of the mobile terminal is embedded into a cavity to form a closed sound cavity. Like the theory of operation of preceding speaker measurement atmospheric pressure, mobile terminal utilizes the speaker to carry out the measurement of atmospheric pressure, when needing to prevent that the speaker vibrating diaphragm from receiving the vibration, the mutual offset when speaker vibrating diaphragm top sound wave signal and below sound wave signal toward outer broadcast to can't acquire the induced electromotive force of the speaker voice coil loudspeaker voice coil vibration of being connected with the speaker vibrating diaphragm, consequently, need seal the speaker in airtight cavity, make speaker vibrating diaphragm top sound wave signal and below sound wave signal can't offset each other, thereby can measure the induced electromotive force of speaker voice coil loudspeaker voice coil after receiving the vibration. The above-mentioned sound wave signals above and below the loudspeaker diaphragm refer to the sound wave signals that are upward in the vertical direction or downward in the vertical direction of the loudspeaker diaphragm in the horizontal placement state of the loudspeaker as shown in fig. 2, that is, the sound wave signals above are the sound wave signals of the loudspeaker facing the outside of the sealed sound cavity, and the sound wave signals below are the sound wave signals of the loudspeaker facing the inside of the sealed sound cavity. Here, the upper acoustic signal and the lower acoustic signal are not limited to the direction of the acoustic signal transmitted by the speaker, but are only used to indicate different propagation directions of the acoustic signal of the speaker, and according to the acoustic signal relative to the sealed cavity, the upper acoustic signal may also be referred to as an outward acoustic signal, and the lower acoustic signal may also be referred to as an inward acoustic signal.
And enabling the loudspeaker diaphragm to be in a static suspension state. The suspension state that the loudspeaker diaphragm is in standing is a state that the loudspeaker diaphragm is placed above the loudspeaker magnetic steel and the loudspeaker does not work. The loudspeaker diaphragm is connected with the loudspeaker voice coil, the loudspeaker voice coil is a coil of the loudspeaker through current, the loudspeaker voice coil is an important component of an electrodynamic loudspeaker mechanical wave system, the heart of the loudspeaker can be said, the performance of the voice coil can influence the sound intensity characteristic of the loudspeaker, and the loudspeaker voice coil generally adopts materials with light weight and strong sensitivity, so that the loudspeaker is used for measuring air pressure and the measuring precision is improved.
And acquiring the initial air pressure value of the closed sound cavity and setting the air pressure value to be P0. When the speaker did not work, when the speaker vibrating diaphragm was in the state of stewing promptly, measure the initial atmospheric pressure value of airtight sound chamber and record for P0 under this state, the initial atmospheric pressure value of airtight sound chamber under the record speaker vibrating diaphragm state of stewing, the difference between the atmospheric pressure under the follow-up speaker vibrating diaphragm of aim at and the speaker vibrating diaphragm state of stewing when receiving external environment pressure, the external environment's that the accurate speaker received pressure is calculated to obtain the external environment's that mobile terminal received pressure.
In addition, the air pressure measurement state initialization module 50 further needs to acquire the magnetic field strength B of the speaker magnetic steel, the length L and the resistance R of the speaker voice coil, and the area S of the speaker diaphragm. Different mobile terminal has probably adopted not unidimensional speaker, the variation in size of each speaker, its speaker vibrating diaphragm, speaker magnet steel, the index parameter inequality of speaker voice coil loudspeaker voice coil, because the speaker variation in size, the pressure size that its speaker vibrating diaphragm received is also different, at the initialized in-process, still need acquire the magnetic field intensity B of above-mentioned speaker magnet steel, magnetic field intensity B 'S size has decided the cutting effort size of speaker voice coil loudspeaker voice coil in the magnetic field that speaker magnet steel produced, the size of induced electromotive force when speaker voice coil loudspeaker voice coil' S length L and resistance R have decided the speaker voice coil loudspeaker voice coil to pass through the electric current, the size of speaker atress has been decided to the area S of speaker vibrating diaphragm. Therefore, the initialization process needs to obtain the related technical parameter values of the speaker assembly, so as to accurately calculate the magnitude of the pressure value of the external environment to which the speaker is subjected in the following process.
And the loudspeaker voice coil induced electromotive force sampling module 60 is used for driving the loudspeaker voice coil to move in a magnetic field under the air pressure action of the external environment on the loudspeaker voice coil according to the loudspeaker diaphragm so as to acquire induced electromotive force generated by the loudspeaker voice coil in a cutting magnetic field.
Specifically, after the speaker air pressure measurement state is initialized, the mobile terminal speaker may receive air pressure from the external environment, and then start the measurement operation. As mentioned above, the loudspeaker diaphragm acts in the magnetic field generated by the loudspeaker magnetic steel, thereby driving the loudspeaker voice coil to perform cutting motion in the magnetic field generated by the loudspeaker magnetic steel. The mobile terminal receives the air pressure from the external environment through the loudspeaker diaphragm, namely the mobile terminal is used as an inlet for receiving the external environment pressure when the mobile terminal starts to measure the external environment air pressure, and the loudspeaker diaphragm is used as induction equipment of the mobile terminal equipment.
As mentioned earlier, the loudspeaker vibrating diaphragm is connected with the loudspeaker voice coil, and mobile terminal receives external environment's pressure effect for the loudspeaker vibrating diaphragm drives the loudspeaker voice coil up-and-down motion, cuts the motion in the magnetic field that the speaker magnet steel produced, when the loudspeaker voice coil cuts the line of magnetic induction with certain speed in the magnetic field, can produce induced voltage in the loudspeaker voice coil inside, also induced electromotive force, its direction accords with the right-hand rule. At this time, the voice coil of the speaker is the initial role of the damping and the receiver of the damping.
The loudspeaker diaphragm drives the loudspeaker voice coil to move in the magnetic field, and the induced voltage generated by the loudspeaker voice coil needs to be acquired, so that the conduction of the positive and negative electrodes at two ends of the loudspeaker voice coil is needed. Referring to the schematic diagram of the circuit for detecting the induced electromotive force in the method for measuring air pressure by using a speaker according to the embodiment of the present invention shown in fig. 3, the two ends of the positive electrode and the negative electrode of the speaker in the sealed cavity are connected to the two ends of the voice coil of the speaker, and are used for measuring the induced electromotive force generated by the voice coil of the speaker, that is, the induced voltage of the voice coil of the speaker.
The electromagnetic acting force Fb generated by the loudspeaker voice coil cutting magnetic field is an acting force applied to the loudspeaker voice coil in the magnetic field generated by the loudspeaker magnetic steel, that is, in the working principle of the loudspeaker, the loudspeaker voice coil is applied with an ampere force, the ampere force is an acting force applied to the energizing wire in the magnetic field, that is, the loudspeaker voice coil in the loudspeaker, according to the formula Fa of the ampere force, the electromagnetic acting force Fb generated by the loudspeaker voice coil cutting magnetic field in the step is B x (U/R) x L, where B is the magnetic field strength of the magnetic field generated by the loudspeaker magnetic steel, U is the induced voltage of the loudspeaker voice coil, that is, the induced electromotive force of the loudspeaker voice coil, R is the resistance of the loudspeaker, and L is the length of the loudspeaker voice coil.
The air pressure value calculating module 70 calculates the air pressure value of the external environment according to the magnetic field strength of the speaker magnetic steel, the length and resistance of the voice coil of the speaker, the area of the diaphragm of the speaker, and the induced electromotive force.
Specifically, the loudspeaker diaphragm is under the atmospheric pressure P effect of external environment, and at this moment, the loudspeaker diaphragm will receive pressure F, F ═ is (P-P0) × S, and the loudspeaker diaphragm will drive the loudspeaker voice coil to make cutting motion in the magnetic field that the speaker magnet steel produced under pressure F' S effect, and when the electromagnetic force Fb that the loudspeaker voice coil cutting magnetic field produced was equal with pressure F, the loudspeaker diaphragm reacquires the balance.
Therefore, according to the aforementioned ampere force formula Fa ═ B × I × L ═ B × (U/R) × L, and F ═ Fa, P0+ (B × U × L)/(R × S) can be obtained, where P0 is the initial air pressure of the speaker enclosure voice coil, B is the magnetic field strength of the magnetic field generated by the speaker magnetic steel, L is the length of the speaker voice coil, R is the resistance value of the speaker voice coil, and S is the area of the speaker diaphragm, and all of them are known physical quantities. The pressure value P of the external environment can be calculated according to the formula by detecting the induced electromotive force U of the voice coil of the loudspeaker.
The device further comprises:
and the voltage sampling module 80 is used for performing ADC sampling on the voltages of the positive and negative poles of the loudspeaker, namely the induced electromotive force of the voice coil of the loudspeaker.
Specifically, the specific operation principle of the voltage sampling module 80 is the same as the circuit principle for detecting the induced electromotive force of the speaker voice coil described above with reference to fig. 3, and is not described herein again.
In addition, the invention also provides a terminal device, which comprises a memory, a processor and a program which is stored in the memory and can be run on the processor and is used for measuring the air pressure by using the loudspeaker, wherein when the processor executes the program for measuring the air pressure by using the loudspeaker, the steps of the method for measuring the air pressure by using the loudspeaker are realized.
In addition, the present invention also provides a computer readable storage medium, which stores a program for measuring air pressure using a speaker, wherein the program for measuring air pressure using a speaker realizes the steps of the method for measuring air pressure using a speaker as described above when being executed by a processor.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases, or other media used in embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for measuring air pressure by using a loudspeaker is used for a mobile terminal to measure air pressure, and is characterized by comprising the following steps:
initializing a loudspeaker air pressure measuring state of the mobile terminal;
the mobile terminal receives air pressure from the external environment through a loudspeaker diaphragm;
the loudspeaker diaphragm drives the loudspeaker voice coil to move in the magnetic field under the action of the air pressure of the external environment;
and the mobile terminal acquires the induced electromotive force on the loudspeaker voice coil so as to calculate the air pressure value of the external environment.
2. The method according to claim 1, wherein initializing the speaker air pressure measurement status of the mobile terminal specifically comprises the following steps:
embedding a loudspeaker of the mobile terminal into the cavity to form a closed sound cavity;
enabling the loudspeaker diaphragm to be in a static suspension state;
and acquiring the initial air pressure value of the closed sound cavity and setting the air pressure value to be P0.
3. The method according to claim 2, wherein initializing the speaker air pressure measurement status of the mobile terminal further comprises:
acquiring the magnetic field intensity B of the loudspeaker magnetic steel;
acquiring the length L and the resistance R of the voice coil of the loudspeaker;
and acquiring the area S of the loudspeaker diaphragm.
4. The method of claim 3, wherein the step of moving the speaker coil in the magnetic field under the action of the air pressure comprises the following steps:
two ends of the loudspeaker voice coil are electrically conducted;
the loudspeaker diaphragm drives the loudspeaker voice coil to move in the magnetic field generated by the loudspeaker magnetic steel, and obtains the electromagnetic acting force Fb generated by the loudspeaker voice coil cutting magnetic field.
5. The method as claimed in claim 3, wherein the step of the mobile terminal obtaining the induced electromotive force on the voice coil of the speaker to calculate the pressure value of the external environment further comprises the following steps:
when the loudspeaker diaphragm drives the loudspeaker voice coil to move in the magnetic field generated by the magnetic steel, the induced electromotive force U generated by the loudspeaker voice coil cutting magnetic field is obtained;
the mobile terminal calculates the air pressure value P of the external environment according to the formula P0+ (B × U × L)/(R × S).
6. The method of claim 5, wherein the induced electromotive force generated by the cutting magnetic field of the voice coil of the speaker is obtained by ADC sampling voltages of the positive and negative poles of the speaker.
7. An apparatus for measuring air pressure using a speaker, the apparatus comprising:
the air pressure measurement state initialization module is used for initializing the air pressure measurement state of the loudspeaker of the mobile terminal;
the loudspeaker voice coil induced electromotive force sampling module is used for driving the loudspeaker voice coil to move in a magnetic field under the action of air pressure of an external environment on the loudspeaker voice coil according to a loudspeaker vibrating diaphragm so as to obtain induced electromotive force generated by the loudspeaker voice coil cutting the magnetic field;
and the air pressure value calculation module calculates the air pressure value of the external environment according to the magnetic field intensity of the loudspeaker magnetic steel, the length and the resistance of the loudspeaker voice coil and the area of the loudspeaker diaphragm and the induced electromotive force.
8. The apparatus for measuring air pressure using a speaker according to claim 7, further comprising:
and the voltage sampling module is used for carrying out ADC sampling on the voltages of the positive pole and the negative pole of the loudspeaker, namely the induced electromotive force of the voice coil of the loudspeaker.
9. A terminal device, characterized in that the terminal device comprises a memory, a processor and a program stored in the memory and executable on the processor for measuring air pressure by using a speaker, and the processor implements the steps of the method for measuring air pressure by using a speaker according to any one of claims 1 to 6 when executing the program for measuring air pressure by using a speaker.
10. A computer-readable storage medium, having stored thereon a program for measuring air pressure using a speaker, which when executed by a processor, performs the steps of the method for measuring air pressure using a speaker according to any one of claims 1 to 6.
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| CN202110893209.5A CN113820064A (en) | 2021-08-04 | 2021-08-04 | Method and device for measuring air pressure by using loudspeaker, terminal equipment and storage medium |
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