CN112461437B - Air pressure detection circuit, method, equipment and storage medium - Google Patents
Air pressure detection circuit, method, equipment and storage medium Download PDFInfo
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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Abstract
The invention discloses an air pressure detection circuit, an air pressure detection method, air pressure detection equipment and a storage medium. Wherein, atmospheric pressure detection circuitry includes: the signal input circuit is used for inputting an audio signal formed by the gas to be detected in the environment where the terminal is located into the loudspeaker; a first determination circuit for determining an amplitude of an audio signal output by the speaker; a second determination circuit for determining a pressure curve based on an amplitude of an audio signal output by the speaker; and determining the gas pressure of the gas to be detected by using the determined gas pressure curve.
Description
Technical Field
The invention relates to an air pressure detection technology, in particular to an air pressure detection circuit, method, equipment and storage medium.
Background
With the rapid development of terminal technology, more and more functions are integrated on a terminal, for example, the terminal can accurately locate a user. Generally, the positioning can be realized by using a global positioning system, or the pressure of gas in the environment where the terminal is located can be detected by using a gas pressure sensor, and the geographical position where the terminal is located can be positioned by using the detected pressure of the gas. Because the cost of the air pressure sensor is high and the air pressure sensor occupies a certain space of the terminal, how to detect the pressure of the air in the environment where the terminal is located at low cost becomes a key technical problem under the condition of saving the space of the terminal.
Disclosure of Invention
Embodiments of the present invention are directed to a pressure detection circuit, a method, an apparatus, and a storage medium.
The technical scheme of the invention is realized as follows:
the embodiment of the invention provides an air pressure detection method, which comprises the following steps:
the signal input circuit is used for inputting an audio signal formed by the gas to be detected in the environment where the terminal is located into the loudspeaker;
a first determination circuit for determining an amplitude of an audio signal output by the speaker;
a second determination circuit for determining a pressure curve based on an amplitude of an audio signal output by the speaker; and determining the gas pressure of the gas to be detected by using the determined gas pressure curve.
In the foregoing solution, the second determining circuit is specifically configured to:
when the amplitude of the audio signal output by the loudspeaker is smaller than or equal to an amplitude threshold value, a preset first air pressure curve is used as an air pressure curve;
the preset first air pressure curve represents the corresponding relation between the impedance of the loudspeaker and the air pressure.
In the foregoing solution, the second determining circuit is specifically configured to:
determining the working voltage and working current of the loudspeaker by using the audio signal output by the loudspeaker;
determining an electrical impedance of the speaker based on the operating voltage and the operating current;
determining air pressure corresponding to the electrical impedance of the loudspeaker by using the preset first air pressure curve;
and taking the determined gas pressure as the gas pressure of the gas to be detected.
In the foregoing solution, the second determining circuit is specifically configured to:
when the amplitude of the audio signal output by the loudspeaker is larger than an amplitude threshold value, a preset second air pressure curve is used as an air pressure curve;
and the preset second air pressure curve represents the corresponding relation between the amplitude and the air pressure of the audio signal output by the loudspeaker.
In the foregoing solution, the second determining circuit is specifically configured to:
determining air pressure corresponding to the amplitude of the audio signal output by the loudspeaker by using a preset second air pressure curve; and taking the determined gas pressure as the gas pressure of the gas to be detected.
In the foregoing solution, the second determining circuit is specifically configured to:
when the amplitude of the audio signal output by the loudspeaker is larger than an amplitude threshold value, detecting the humidity in the environment where the terminal is located;
when the detected humidity is larger than the humidity threshold value, taking a preset first air pressure curve and a preset second air pressure curve as air pressure curves;
the preset first air pressure curve represents the corresponding relation between the impedance of the loudspeaker and the air pressure, and the preset second air pressure curve represents the corresponding relation between the amplitude of the audio signal output by the loudspeaker and the air pressure.
In the foregoing solution, the second determining circuit is specifically configured to:
determining corresponding voltage values and current values by using audio signals output by the loudspeaker; determining an electrical impedance of the speaker based on the voltage value and the current value; determining a first air pressure corresponding to the electrical impedance of the loudspeaker by using the preset first air pressure curve;
determining a second air pressure corresponding to the amplitude of the audio signal output by the loudspeaker by using a preset second air pressure curve;
carrying out weighted averaging operation on the first air pressure and the second air pressure; and taking the air pressure after the weighted averaging operation as the air pressure of the gas to be detected.
The embodiment of the invention provides an air pressure detection method, which comprises the following steps:
inputting an audio signal formed by gas to be detected in the environment where the terminal is located into a loudspeaker;
determining an amplitude of an audio signal output by the speaker;
determining a pressure curve based on the amplitude of the audio signal output by the speaker; and determining the gas pressure of the gas to be detected by using the determined gas pressure curve.
In the foregoing solution, the determining an air pressure curve based on the amplitude of the audio signal output by the speaker includes:
when the amplitude of the audio signal output by the loudspeaker is smaller than or equal to an amplitude threshold value, a preset first air pressure curve is used as an air pressure curve;
the preset first air pressure curve represents the corresponding relation between the impedance of the loudspeaker and the air pressure.
In the above scheme, the determining the gas pressure of the gas to be detected by using the determined gas pressure curve includes:
determining the working voltage and working current of the loudspeaker by using the audio signal output by the loudspeaker;
determining an electrical impedance of the speaker based on the operating voltage and the operating current;
determining air pressure corresponding to the electrical impedance of the loudspeaker by using the preset first air pressure curve;
and taking the determined gas pressure as the gas pressure of the gas to be detected.
In the foregoing solution, the determining an air pressure curve based on the amplitude of the audio signal output by the speaker includes:
when the amplitude of the audio signal output by the loudspeaker is larger than an amplitude threshold value, a preset second air pressure curve is used as an air pressure curve;
and the preset second air pressure curve represents the corresponding relation between the amplitude and the air pressure of the audio signal output by the loudspeaker.
In the above scheme, the determining the gas pressure of the gas to be detected by using the determined gas pressure curve includes:
determining air pressure corresponding to the amplitude of the audio signal output by the loudspeaker by using a preset second air pressure curve; and taking the determined gas pressure as the gas pressure of the gas to be detected.
In the foregoing solution, the determining an air pressure curve based on the amplitude of the audio signal output by the speaker includes:
when the amplitude of the audio signal output by the loudspeaker is larger than an amplitude threshold value, detecting the humidity in the environment where the terminal is located;
when the detected humidity is larger than a humidity threshold value, taking a preset first air pressure curve and a preset second air pressure curve as air pressure curves;
the preset first air pressure curve represents the corresponding relation between the impedance of the loudspeaker and the air pressure, and the preset second air pressure curve represents the corresponding relation between the amplitude of the audio signal output by the loudspeaker and the air pressure.
In the above scheme, the determining the gas pressure of the gas to be detected by using the determined gas pressure curve includes:
determining corresponding voltage values and current values by using audio signals output by the loudspeaker; determining an electrical impedance of the speaker based on the voltage value and the current value; determining a first air pressure corresponding to the electrical impedance of the loudspeaker by using the preset first air pressure curve;
determining a second air pressure corresponding to the amplitude of the audio signal output by the loudspeaker by using a preset second air pressure curve;
carrying out weighted averaging operation on the first air pressure and the second air pressure; and taking the air pressure after the weighted averaging operation as the air pressure of the gas to be detected.
An embodiment of the present invention provides a terminal, including: a processor and a memory for storing a computer program capable of running on the processor,
wherein the processor is configured to implement the steps of any of the above methods when executing the computer program.
An embodiment of the present invention provides a storage medium, on which a computer program is stored, which when executed by a processor implements the steps of any of the above-mentioned methods.
The embodiment of the invention provides an air pressure detection circuit, a method, equipment and a storage medium, wherein the air pressure detection circuit comprises: the signal input circuit is used for inputting an audio signal formed by the gas to be detected in the environment where the terminal is located into the loudspeaker; a first determination circuit for determining an amplitude of an audio signal output by the speaker; a second determination circuit for determining a pressure curve based on an amplitude of an audio signal output by the speaker; and determining the gas pressure of the gas to be detected by using the determined gas pressure curve. By adopting the technical scheme of the embodiment of the invention, the circuit structure for realizing the air pressure detection is simpler, compared with the mode of detecting the air pressure by adopting the air pressure sensor in the related technology, the air pressure detection device does not need to be connected with a matching circuit related to the air pressure sensor, can save the space of the terminal and save the cost, and thus, the air pressure in the environment where the terminal is positioned can be detected with low cost under the condition of saving the space of the terminal.
Drawings
FIG. 1 is a schematic diagram of a corresponding circuit structure of a piezoresistive sensor in the related art
FIG. 2 is a schematic diagram of a configuration of an air pressure detection circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a speaker generating sound under air pressure according to an embodiment of the present invention;
FIG. 4 is a diagram of a mechanical model corresponding to a speaker according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an electrical model of a loudspeaker according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating the relationship between the impedance and the air pressure of the speaker under different air pressures according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating the relationship between the amplitude and the air pressure of the speaker under different air pressures according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a predetermined relationship between barometric pressure and altitude according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a specific structure of an air pressure detection circuit according to an embodiment of the present invention;
FIG. 10 is a schematic view of a waterproof structure of a sound emitting hole of a speaker according to an embodiment of the present invention;
FIG. 11 is a schematic flow chart illustrating an implementation of the air pressure detection method according to the embodiment of the present invention;
fig. 12 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
Before describing the technical solution of the embodiment of the present invention in detail, a description will be given of a related art.
In the related art, a pressure sensor may be used to detect the pressure of gas in an environment where a terminal is located, and the detected pressure of the gas is used to position a Global Positioning System (GPS), so as to improve the Positioning accuracy from 10 meters to 1 meter; the pressure of the detected gas can be used for navigation assistance, particularly in places such as viaducts and the like where GPS cannot accurately judge, and the device can also be used for indoor positioning, outdoor mountaineering, fishing and other scenes needing air pressure.
Generally, the air pressure sensor may include a thin film type sensor and a piezoresistive type sensor. The film type sensor is controlled by a film sensitive to the strength of air pressure and a thimble, and a flexible resistor needs to be connected in a corresponding circuit structure. The working principle of the film sensor is as follows: when the pressure of the measured gas is reduced or increased, the film deforms to drive the thimble, so that the resistance value of the flexible resistor is changed; according to the resistance value of the flexible resistor, 0-5V signal voltage can be obtained and sent to a data acquisition unit through A/D conversion; the data collector transmits the results in a suitable form to the processor for processing. The piezoresistive sensor is a Wheatstone bridge diffused on a monocrystalline silicon wafer. The working principle of the piezoresistive sensor is as follows: when the pressure changes, the monocrystalline silicon generates strain, so that the strain resistor directly diffused on the monocrystalline silicon generates change proportional to the measured pressure, and a differential voltage signal is generated; after the differential voltage signal passes through the special amplifier and the voltage-current conversion circuit, the signal corresponding to the measuring range is converted into a standard electric signal to be output. Fig. 1 is a schematic circuit diagram corresponding to a piezoresistive sensor in the related art, and as shown in fig. 1, a wheatstone bridge formed by a piezoresistor in the piezoresistive sensor, such as a Micro-Electro-Mechanical System (MEMS) sensor, is affected by air pressure, which may cause the impedance of the piezoresistor to change, thereby generating different currents; outputting different digital signals through a signal processing and analog-to-digital conversion circuit; and finding out the corresponding air pressure value by utilizing the established corresponding relation between the digital signal and the air pressure.
In summary, in the related art, a special pressure sensor is used to detect the pressure of the gas, such as pressure sensors Galaxy Note2, Galaxy SIII, and millet 2. However, in intelligent products such as watches, earphones and other intelligent wearable products, the air pressure sensor and the matching circuit thereof need to occupy a certain position, and when the internal space of the terminal is insufficient, a larger capacity can be reserved for a battery or other components if the space occupied by the air pressure sensor is removed. In addition, the cost of the air pressure sensor is also high, so how to detect the pressure of the air in the environment where the terminal is located at low cost while saving the space of the terminal becomes a key technical problem.
Based on this, in various embodiments of the present invention, the air pressure detection circuit includes: the signal input circuit is used for inputting an audio signal formed by the gas to be detected in the environment where the terminal is located into the loudspeaker; a first determination circuit for determining an amplitude of an audio signal output by the speaker; a second determination circuit for determining a pressure curve based on an amplitude of an audio signal output by the speaker; and determining the gas pressure of the gas to be detected by using the determined gas pressure curve.
It should be noted that, in the embodiment of the present invention, a speaker disposed in a terminal is used, and an audio signal formed by a gas to be detected in an environment where the terminal is located is input to the speaker, so that a currently used air pressure curve is selected by using the audio signal output by the speaker, and thus, the air pressure of the gas to be detected is obtained by using the selected air pressure curve.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 2 is a schematic diagram illustrating a structure of the air pressure detection circuit according to an embodiment of the present invention; as shown in fig. 2, the circuit includes:
the signal input circuit 21 is used for inputting an audio signal formed by gas to be detected in the environment where the terminal is located into the loudspeaker;
a first determination circuit 22 for determining an amplitude of an audio signal output from the speaker;
a second determination circuit 23 for determining a pressure curve based on the amplitude of the audio signal output from the speaker; and determining the gas pressure of the gas to be detected by using the determined gas pressure curve.
Here, in practical application, in consideration that an audio signal formed by the gas to be detected in the environment where the terminal is located may include some noise, the signal input circuit 21 may be specifically configured to perform denoising processing on the audio signal formed by the gas to be detected in the environment where the terminal is located by using algorithms such as filtering, amplify the audio signal processed at the denoising processing, and input the amplified audio signal into the speaker. The audio signal formed by the gas to be detected in the environment where the terminal is located can be collected through a microphone and other collection devices of the terminal.
Here, in practical applications, the speaker generally comprises a vibration system (such as a voice coil, etc.) and a support auxiliary system (such as a centering disk, etc.), so that after an audio signal formed by the gas to be detected in the environment where the terminal is located is input to the speaker, the audio signal is input from one end of the vibration system of the speaker, such as the voice coil, and is output from the other end of the vibration system of the speaker, such as the voice coil, so that the first determining circuit 22 can be used to determine the amplitude of the audio signal output by the speaker, and can be subsequently used to determine a corresponding pressure curve.
Here, in practical application, considering that the environment where the terminal is located may be in a mountain or in water, in this way, the amplitudes of the audio signals output by the speaker in different environments are different, and therefore, the second determining circuit 23 may be configured to select the air pressure curve matched with the current environment according to the amplitude of the audio signal output by the speaker, so as to accurately detect the air pressure of the gas to be detected in the environment where the terminal is located.
The functions implemented by the respective circuits in the air pressure detection circuit will be described in detail below.
In practical application, the audio signal formed by the gas to be detected in the environment where the terminal is located is collected, and before the collected audio signal is input to the loudspeaker, the collected audio signal may contain some noises, so that the collected audio signal formed by the gas to be detected needs to be filtered. In order to make the signal intensity of the filtered audio signal meet the requirement of the speaker, the filtered audio signal needs to be amplified.
Based on this, in one embodiment, the signal input circuit 21 includes:
the filtering algorithm circuit is used for denoising the audio signal formed by the gas to be detected in the environment where the terminal is located by adopting filtering and other algorithms;
and the signal amplifying circuit is used for amplifying the audio signal after the noise removing treatment and inputting the audio signal after the amplification treatment into the loudspeaker.
In practical application, a mechanical model and an electrical model of the loudspeaker can be established, and a one-to-one mapping relation between the working voltage and the amplitude of the loudspeaker is established by combining the established mechanical model and the established electrical model of the loudspeaker, so that after the audio signal formed by the gas to be detected in the environment where the terminal is located is input into the loudspeaker subsequently, the working voltage corresponding to the signal can be determined according to the audio signal output by the loudspeaker, and the amplitude of the audio signal output by the loudspeaker can be determined by utilizing the pre-established mapping relation between the working voltage and the amplitude of the loudspeaker.
Based on this, in an embodiment, the first determining circuit 22 is specifically configured to:
determining an operating voltage of an audio signal output by the speaker;
determining the amplitude corresponding to the working voltage by using a preset corresponding relation between the voltage and the amplitude;
the determined amplitude is taken as the amplitude of the audio signal output by the loudspeaker.
Here, fig. 3 is a schematic diagram of a speaker generating sound under the action of air pressure, as shown in fig. 3, under different air pressures, an audio signal formed by the gas to be detected is acquired and obtained through a microphone of the acquisition device of the terminal and the like and is input into the speaker; the loudspeaker vibrates through the diaphragm and pushes air to form air fluctuation, so that sound is produced. The difficulty of the speaker to push air is related to the rareness of air (i.e. air pressure), i.e. the more rarer the air is, the easier the air is, and the more rarer the air is, the harder the air is.
Here, fig. 4 is a schematic diagram of a mechanical model corresponding to the speaker, and the electromagnetic force is calculated according to the mechanical model shown in fig. 4, as shown in formula (1).
Wherein B is the magnetic field strength, l is the coil length, i is the coil current, m is the vibration mass, x (t) is the vibration amplitude over time, k is the spring elastic coefficient, and r is the vibrator coefficient. The air resistance is positively correlated with the air pressure.
Here, fig. 5 is a schematic diagram of an electrical model corresponding to the speaker, and the voltage of the speaker is calculated according to the electrical model shown in fig. 5, as shown in equation (2).
Wherein R is resistance, L is inductance, B is magnetic field intensity, and L is coil length.
Here, the amplitude of the audio signal output from the speaker can be obtained by performing equivalent conversion between the mechanical model and the electrical model of the vibrator, as shown in equation (3).
x(t)＝H(s)×u(t) (3)
Where H(s) is a transfer function that is a function constant associated with B, L, L, i, m; u (t) is the current operating voltage of the loudspeaker.
Here, after the operating voltage of the speaker is determined according to the formula (3), the amplitude x (t) of the speaker may be measured, and thus, a one-to-one mapping relationship between the operating voltage and the amplitude of the speaker may be established.
In practical application, the corresponding relation between the impedance of the loudspeaker and the air pressure can be pre-established, the corresponding relation between the amplitude of an audio signal output by the loudspeaker and the air pressure can also be pre-established, and when the air pressure of the gas to be detected in the environment where the terminal is located is detected, how to ensure the accuracy of air pressure detection is critical to how to select a proper air pressure curve.
The following describes in detail how to select a pressure curve to detect the pressure of the gas to be detected in the environment in which the terminal is located.
In the first case, if the amplitude of the audio signal output by the speaker is small, the impedance-air pressure curve is selected to detect the air pressure of the gas to be detected in the environment where the terminal is located.
Specifically, in practical application, when a user places the terminal in an environment such as water, and after the audio signal formed by the gas to be detected in the environment where the terminal is located is input to the speaker, the amplitude of the audio signal output by the speaker is limited, so that the impedance-air pressure corresponding curve can be preferentially selected to detect the air pressure of the gas to be detected in the environment where the terminal is located, and the accuracy of detecting the air pressure of the gas to be detected in the environment inside the water is improved.
Based on this, in an embodiment, the second determining circuit 23 is specifically configured to:
when the amplitude of the audio signal output by the loudspeaker is smaller than or equal to an amplitude threshold value, a preset first air pressure curve is used as an air pressure curve;
the preset first air pressure curve represents the corresponding relation between the impedance of the loudspeaker and the air pressure.
In practical application, after the impedance-air pressure corresponding curve is determined and selected, the impedance of the loudspeaker needs to be calculated, and then the impedance-air pressure corresponding curve can be used for determining the air pressure of the gas to be detected in the environment where the terminal is located.
Based on this, in an embodiment, the second determining circuit 23 is specifically configured to:
determining the working voltage and working current of the loudspeaker by using the audio signal output by the loudspeaker;
determining an electrical impedance of the speaker based on the operating voltage and the operating current;
determining air pressure corresponding to the electrical impedance of the loudspeaker by using the preset first air pressure curve;
and taking the determined gas pressure as the gas pressure of the gas to be detected.
Here, first, the current working voltage and current of the speaker may be obtained according to the audio signal fed back by the speaker, so as to obtain the electrical impedance of the coil of the speaker by using the working voltage and current; then, calculating the frequency of the audio signal fed back by the loudspeaker; and finally, according to the calculated electrical impedance and the frequency of the audio signal, combining a pre-established impedance-air pressure model (namely, presetting a first air pressure curve) to obtain the corresponding current air pressure. The acoustic models of the loudspeakers under different air pressures are different, and the acoustic models are reflected in the mechanical models to be different in air force impedance, and the acoustic models are reflected in the electrical models to be different in electrical impedance.
For example, fig. 6 is a diagram illustrating the impedance-air pressure relationship of the speaker under different air pressures. As shown in fig. 6, the air pressures are different, the impedance-air pressure correspondence is different, and if the electrical impedance of the speaker coil obtained according to the audio signal fed back by the speaker is 7 Ω, and the frequency F0 of the audio signal is 1200Hz, it is determined from the impedance-air pressure curve that the air pressure of the gas to be detected in the environment where the terminal is located is the standard atmospheric pressure.
In the second case, if the amplitude of the audio signal output by the speaker is large, an amplitude-air pressure curve is selected to detect the air pressure of the gas to be detected in the environment where the terminal is located.
Specifically, in practical application, when a user places the terminal in an environment such as a mountain, and after the audio signal formed by the gas to be detected in the environment where the terminal is located is input to the speaker, the amplitude of the audio signal output by the speaker is not limited, so that a corresponding curve of amplitude-air pressure can be preferentially selected to detect the air pressure of the gas to be detected in the environment where the terminal is located, and the accuracy of detecting the air pressure of the gas to be detected in the environment of the mountain is improved.
Based on this, in an embodiment, the second determining circuit 23 is specifically configured to:
when the amplitude of the audio signal output by the loudspeaker is larger than an amplitude threshold value, a preset second air pressure curve is used as an air pressure curve;
and the preset second air pressure curve represents the corresponding relation between the amplitude and the air pressure of the audio signal output by the loudspeaker.
In practical application, after the amplitude-air pressure corresponding curve is determined and selected, the amplitude of the audio signal output by the loudspeaker needs to be calculated, and then the amplitude-air pressure corresponding curve can be used for determining the air pressure of the gas to be detected in the environment where the terminal is located.
Based on this, in an embodiment, the second determining circuit 23 is specifically configured to:
determining air pressure corresponding to the amplitude of the audio signal output by the loudspeaker by using a preset second air pressure curve; and taking the determined gas pressure as the gas pressure of the gas to be detected.
Here, the type of speaker may be determined first; then, according to the type of the speaker and the amplitude of the audio signal output by the speaker, a pre-established amplitude-air pressure model (i.e. a preset second air pressure curve) is combined to obtain the corresponding current air pressure.
For example, fig. 7 is a diagram illustrating the relationship between the amplitude and the air pressure of the speaker under different air pressures. As shown in fig. 7, assuming that the type of the speaker is 1217 and the amplitude of the audio signal output from the speaker is 0.35mm, it is determined from the amplitude-air pressure curve that the air pressure of the gas to be detected in the environment in which the terminal is located is about 0.7 standard atmospheric pressure.
In the third situation, if the amplitude of the audio signal output by the speaker is small and the humidity of the environment where the terminal is located is large, the impedance-air pressure curve and the amplitude-air pressure curve are combined to detect the air pressure of the gas to be detected in the environment where the terminal is located.
Specifically, during practical application, when a user places the terminal in water and other environments, after the audio signal formed by the gas to be detected in the environment where the terminal is located is input to the loudspeaker, the amplitude of the audio signal output by the loudspeaker is limited, and in addition, the working voltage and the working current of the audio signal output by the loudspeaker are influenced when the humidity in the environment is too high, so that the air pressure of the gas to be detected in the environment where the terminal is located can be detected by combining an impedance-air pressure curve and an amplitude-air pressure curve, and the accuracy of air pressure detection of the gas to be detected in the environment inside water is improved.
Based on this, in an embodiment, the second determining circuit 23 is specifically configured to:
when the amplitude of the audio signal output by the loudspeaker is larger than an amplitude threshold value, detecting the humidity in the environment where the terminal is located;
when the detected humidity is larger than a humidity threshold value, taking a preset first air pressure curve and a preset second air pressure curve as air pressure curves;
the preset first air pressure curve represents the corresponding relation between the impedance of the loudspeaker and the air pressure, and the preset second air pressure curve represents the corresponding relation between the amplitude of the audio signal output by the loudspeaker and the air pressure.
In practical application, after the impedance-air pressure corresponding curve and the amplitude-air pressure corresponding curve are determined to be selected, one air pressure is determined by using the impedance-air pressure curve, the other air pressure is determined by using the amplitude-air pressure curve, and finally the two air pressure values are subjected to weighted averaging operation to obtain the air pressure of the gas to be detected in the environment where the terminal is located.
Based on this, in an embodiment, the second determining circuit 23 is specifically configured to:
determining corresponding voltage values and current values by using audio signals output by the loudspeaker; determining an electrical impedance of the speaker based on the voltage value and the current value; determining a first air pressure corresponding to the electrical impedance of the loudspeaker by using the preset first air pressure curve;
determining a second air pressure corresponding to the amplitude of the audio signal output by the loudspeaker by using a preset second air pressure curve;
carrying out weighted averaging operation on the first air pressure and the second air pressure; and taking the air pressure after the weighted averaging operation as the air pressure of the gas to be detected.
For example, if it is determined from the impedance-pressure curve that the pressure of the gas to be detected in the environment in which the terminal is located is the standard atmospheric pressure P, and it is determined from the amplitude-pressure curve that the pressure of the gas to be detected in the environment in which the terminal is located is 0.7 standard atmospheric pressures, that is, 0.7P, the pressure m obtained by weighting and averaging the two atmospheric pressures is (P × 0.8+0.7P × 0.6)/2 is 0.61P. Wherein, 0.8 and 0.6 are weight coefficients, which can be adjusted according to actual conditions.
In one embodiment, fig. 8 shows a preset corresponding relationship between air pressure and altitude, and the altitude value can be obtained by using the air pressure measured by the speaker. Assuming an air pressure of 966.1mp is obtained through the speaker, the corresponding altitude is 400 gpm.
The following describes the implementation principle of the air pressure detection circuit in detail with reference to specific embodiments.
As shown in fig. 9, the air pressure detection circuit includes: the device comprises an algorithm module, a signal amplification module, a loudspeaker, an amplitude module, an impedance-air pressure model module and an amplitude-air pressure model module; wherein the content of the first and second substances,
the signal input circuit 21 includes: the system comprises an algorithm module and a signal amplification module;
the first determination circuit 22 includes: an amplitude module;
the second determination circuit 23 includes: the device comprises an impedance module, an impedance-air pressure model module and an amplitude-air pressure model module.
The implementation principle of each module is explained below.
The algorithm module is used for carrying out filtering algorithm processing on an audio signal formed by the gas to be detected in the environment where the acquired terminal is located; and the signal amplification module is used for amplifying the audio signal after the filtering processing and outputting the audio signal after the amplifying processing to a loudspeaker.
A speaker for feeding back different audio signals under different air pressures,
the amplitude module is used for calculating corresponding amplitude by using the audio signal fed back by the loudspeaker;
the impedance module is used for measuring and obtaining working current and working voltage on a voice coil of the loudspeaker by using the audio signal fed back by the loudspeaker when the amplitude of the audio signal output by the loudspeaker is smaller than or equal to an amplitude threshold value; and calculating the electrical impedance of the loudspeaker according to the working voltage and the working current.
And the impedance-air pressure model module is used for determining the air pressure corresponding to the electrical impedance of the loudspeaker by utilizing the electrical impedance of the loudspeaker calculated by the impedance module and combining the preset first air pressure curve.
And the amplitude-air pressure model module is used for determining the air pressure corresponding to the electrical impedance of the loudspeaker by using the amplitude of the audio signal output by the loudspeaker calculated by the amplitude module and combining the preset second air pressure curve when the amplitude of the audio signal output by the loudspeaker is greater than an amplitude threshold value.
It should be noted that, in this embodiment, the amplitude of the audio signal output by the speaker is measured: if the amplitude exceeds a certain threshold value, judging that the water surface is on, calling an amplitude-air pressure model, judging the current air pressure according to different amplitudes, and measuring the current altitude according to the air pressure in high-altitude low-air-pressure areas such as climbing mountains; and when the amplitude is smaller than the threshold value, judging that the current working state is under the water surface, the amplitude is limited at the moment, switching to an impedance-air pressure (or water pressure) model, outputting a signal to obtain the current air pressure (or water pressure) under different pressures, and obtaining the underwater depth for underwater activities such as diving and the like.
In this embodiment, the air pressure measurement function is realized by using the amplitude and impedance difference of the loudspeaker diaphragm under different air pressures. The loudspeaker is used for measuring air pressure, so that an original special air pressure sensor can be reduced, precious space in the intelligent equipment can be saved, and user experience is improved.
In this embodiment, other parameters, such as the total quality factor Q and the resonant frequency F, may also be derived by using the impedance, so that the impedance-air pressure curve may be replaced by other parameters-air pressure curves.
In this embodiment, the sound emitting hole of the speaker can be sealed by waterproof foam and waterproof dustproof mesh, and the specific structure is shown in fig. 10. Through waterproof construction, guarantee that water does not get into sound chamber before the speaker.
By adopting the technical scheme of the embodiment of the invention, a matching circuit related to the air pressure sensor is not required to be connected, so that the space of the terminal can be saved and the cost can be saved compared with a mode of detecting the air pressure by adopting the air pressure sensor in the related technology, and thus, the pressure of the gas in the environment where the terminal is located can be detected at low cost under the condition of saving the space of the terminal.
Fig. 11 is a schematic flow chart illustrating an implementation of the air pressure detection method according to the embodiment of the present invention; as shown in fig. 11, the method includes:
step 1101: inputting an audio signal formed by gas to be detected in the environment where the terminal is located into a loudspeaker;
step 1102: determining an amplitude of an audio signal output by the speaker;
step 1103: determining a pressure curve based on the amplitude of the audio signal output by the speaker; and determining the gas pressure of the gas to be detected by using the determined gas pressure curve.
In one embodiment, the determining a pressure curve based on the amplitude of the audio signal output by the speaker comprises:
when the amplitude of the audio signal output by the loudspeaker is smaller than or equal to an amplitude threshold value, a preset first air pressure curve is used as an air pressure curve;
the preset first air pressure curve represents the corresponding relation between the impedance of the loudspeaker and the air pressure.
In one embodiment, the determining the gas pressure of the gas to be detected by using the determined gas pressure curve includes:
determining the working voltage and working current of the loudspeaker by using the audio signal output by the loudspeaker;
determining an electrical impedance of the speaker based on the operating voltage and the operating current;
determining air pressure corresponding to the electrical impedance of the loudspeaker by using the preset first air pressure curve;
and taking the determined gas pressure as the gas pressure of the gas to be detected.
In one embodiment, the determining a pressure curve based on the amplitude of the audio signal output by the speaker comprises:
when the amplitude of the audio signal output by the loudspeaker is larger than an amplitude threshold value, a preset second air pressure curve is used as an air pressure curve;
and the preset second air pressure curve represents the corresponding relation between the amplitude and the air pressure of the audio signal output by the loudspeaker.
In one embodiment, the determining the gas pressure of the gas to be detected by using the determined gas pressure curve includes:
determining air pressure corresponding to the amplitude of the audio signal output by the loudspeaker by using a preset second air pressure curve; and taking the determined gas pressure as the gas pressure of the gas to be detected.
In one embodiment, the determining a pressure curve based on the amplitude of the audio signal output by the speaker comprises:
when the amplitude of the audio signal output by the loudspeaker is larger than an amplitude threshold value, detecting the humidity in the environment where the terminal is located;
when the detected humidity is larger than the humidity threshold value, taking a preset first air pressure curve and a preset second air pressure curve as air pressure curves;
and the preset second air pressure curve represents the corresponding relation between the amplitude and the air pressure of the audio signal output by the loudspeaker.
In one embodiment, the determining the gas pressure of the gas to be detected by using the determined gas pressure curve includes:
determining corresponding voltage values and current values by using audio signals output by the loudspeaker; determining an electrical impedance of the speaker based on the voltage value and the current value; determining a first air pressure corresponding to the electrical impedance of the loudspeaker by using the preset first air pressure curve;
determining a second air pressure corresponding to the amplitude of the audio signal output by the loudspeaker by using a preset second air pressure curve;
carrying out weighted averaging operation on the first air pressure and the second air pressure; and taking the air pressure after weighted averaging operation as the air pressure of the gas to be detected.
By adopting the technical scheme of the embodiment of the invention,
based on the hardware implementation of the above-mentioned devices, an embodiment of the present invention further provides a terminal, fig. 12 is a schematic diagram of a hardware composition structure of the terminal according to the embodiment of the present invention, as shown in fig. 12, the terminal 120 includes a memory 123, a processor 122, and a computer program stored in the memory 123 and capable of running on the processor 122; the processor 122, when executing the program, implements the method provided by one or more of the above technical solutions.
It should be noted that, the specific steps implemented when the processor 122 executes the program have been described in detail above, and are not described herein again.
It is understood that the terminal 120 further includes a communication interface 121, and the communication interface 121 is used for information interaction with other devices; meanwhile, various components in the terminal 120 are coupled together by a bus system 124. It will be appreciated that the bus system 124 is configured to enable connected communication between these components. The bus system 124 includes a power bus, a control bus, a status signal bus, and the like, in addition to the data bus.
It will be appreciated that the memory 123 in this embodiment may be either volatile memory or nonvolatile memory, and may include both volatile and nonvolatile memory. Among them, the nonvolatile Memory may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a magnetic random access Memory (FRAM), a magnetic random access Memory (Flash Memory), a magnetic surface Memory, an optical Disc, or a Compact Disc Read-Only Memory (CD-ROM); the magnetic surface storage may be disk storage or tape storage. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced DRAM), Synchronous Dynamic Random Access Memory (SLDRAM), Direct Memory (DRmb Access), and Random Access Memory (DRAM). The described memory for embodiments of the present invention is intended to comprise, without being limited to, these and any other suitable types of memory.
The method disclosed in the above embodiments of the present invention may be applied to the processor 122, or implemented by the processor 122. The processor 122 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 122. The processor 122 described above may be a general purpose processor, a DSP, or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. Processor 122 may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed by the embodiment of the invention can be directly implemented by a hardware decoding processor, or can be implemented by combining hardware and software modules in the decoding processor. The software modules may be located in a storage medium located in a memory where information is read by the processor 122 to perform the steps of the foregoing methods in conjunction with its hardware.
The embodiment of the invention also provides a storage medium, in particular a computer storage medium, and more particularly a computer readable storage medium. On which computer instructions, i.e. a computer program, are stored, which computer instructions, when executed by a processor, perform the method provided by one or more of the above-mentioned aspects.
In the embodiments provided in the present invention, it should be understood that the disclosed method and intelligent device may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media that can store program code.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product stored in a storage medium, and including several instructions for enabling a computer device (which may be a personal computer, an electronic device, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media that can store program code.
It should be noted that: "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In addition, the technical solutions described in the embodiments of the present invention may be arbitrarily combined without conflict.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A pressure sensing circuit, the circuit comprising:
the signal input circuit is used for inputting an audio signal formed by the gas to be detected in the environment where the terminal is located into the loudspeaker;
a first determination circuit for determining an amplitude of an audio signal output by the speaker;
a second determination circuit for determining a pressure curve based on an amplitude of an audio signal output by the speaker; determining the air pressure of the gas to be detected by utilizing the determined air pressure curve;
wherein the air pressure profile comprises:
presetting a first air pressure curve; the preset first air pressure curve represents the corresponding relation between the impedance of the loudspeaker and the air pressure;
and/or the presence of a gas in the gas,
presetting a second air pressure curve; and the preset second air pressure curve represents the corresponding relation between the amplitude and the air pressure of the audio signal output by the loudspeaker.
2. The circuit of claim 1, wherein the second determination circuit is specifically configured to:
and when the amplitude of the audio signal output by the loudspeaker is smaller than or equal to an amplitude threshold value, presetting a first air pressure curve as an air pressure curve.
3. The circuit of claim 2, wherein the second determination circuit is specifically configured to:
determining the working voltage and working current of the loudspeaker by using the audio signal output by the loudspeaker;
determining an electrical impedance of the speaker based on the operating voltage and the operating current;
determining air pressure corresponding to the electrical impedance of the loudspeaker by using the preset first air pressure curve;
and taking the determined gas pressure as the gas pressure of the gas to be detected.
4. The circuit of claim 1, wherein the second determination circuit is specifically configured to:
and when the amplitude of the audio signal output by the loudspeaker is greater than the amplitude threshold value, taking a preset second air pressure curve as an air pressure curve.
5. The circuit of claim 4, wherein the second determination circuit is specifically configured to:
determining air pressure corresponding to the amplitude of the audio signal output by the loudspeaker by using a preset second air pressure curve; and taking the determined gas pressure as the gas pressure of the gas to be detected.
6. The circuit of claim 1, wherein the second determination circuit is specifically configured to:
when the amplitude of the audio signal output by the loudspeaker is larger than an amplitude threshold value, detecting the humidity in the environment where the terminal is located;
and when the detected humidity is larger than the humidity threshold value, taking a preset first air pressure curve and a preset second air pressure curve as air pressure curves.
7. The circuit of claim 6, wherein the second determination circuit is specifically configured to:
determining corresponding voltage values and current values by using audio signals output by the loudspeaker; determining an electrical impedance of the speaker based on the voltage value and the current value; determining a first air pressure corresponding to the electrical impedance of the loudspeaker by using the preset first air pressure curve;
determining a second air pressure corresponding to the amplitude of the audio signal output by the loudspeaker by using a preset second air pressure curve;
carrying out weighted averaging operation on the first air pressure and the second air pressure; and taking the air pressure after the weighted averaging operation as the air pressure of the gas to be detected.
8. A method of detecting air pressure, the method comprising:
inputting an audio signal formed by gas to be detected in the environment where the terminal is located into a loudspeaker;
determining an amplitude of an audio signal output by the speaker;
determining a pressure curve based on the amplitude of the audio signal output by the speaker; determining the air pressure of the gas to be detected by utilizing the determined air pressure curve;
wherein the air pressure profile comprises:
presetting a first air pressure curve; the preset first air pressure curve represents the corresponding relation between the impedance of the loudspeaker and the air pressure;
and/or the presence of a gas in the gas,
presetting a second air pressure curve; and the preset second air pressure curve represents the corresponding relation between the amplitude and the air pressure of the audio signal output by the loudspeaker.
9. A terminal, comprising: a processor and a memory for storing a computer program capable of running on the processor,
wherein the processor is adapted to perform the steps of the method of claim 8 when executing the computer program.
10. A storage medium having a computer program stored thereon, the computer program, when being executed by a processor, performing the method steps of claim 8.
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| CN113820064A (en) * | 2021-08-04 | 2021-12-21 | 惠州Tcl云创科技有限公司 | Method and device for measuring air pressure by using loudspeaker, terminal equipment and storage medium |
| CN113933467B (en) * | 2021-10-26 | 2024-02-13 | 国网浙江省电力有限公司电力科学研究院 | Sulfur hexafluoride decomposition product air pressure monitoring device based on gas in-situ detection |
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| US3532085A (en) * | 1968-08-30 | 1970-10-06 | Hoffmann La Roche | Narrowband ultrasonic doppler detecting system for a blood pressure monitor system |
| FI94565C (en) * | 1992-02-13 | 1995-09-25 | Nokia Deutschland Gmbh | Device to be used for changing the acoustic properties of a room space |
| US5351527A (en) * | 1992-12-04 | 1994-10-04 | Trw Vehicle Safety Systems Inc. | Method and apparatus for testing fluid pressure in a sealed vessel |
| JPH07103838A (en) * | 1993-10-04 | 1995-04-21 | Matsushita Electric Ind Co Ltd | Micromanometer |
| CN1721832A (en) * | 2004-07-12 | 2006-01-18 | 谢祯桂 | Burglar detection device |
| GB2461847A (en) * | 2008-07-10 | 2010-01-20 | Vodafone Plc | Detection of car crash by detection of sound pressure wave associated with air bag deployment, pressure wave transducer and emergency communication method |
| GB2547284B (en) * | 2016-02-15 | 2019-11-06 | Ft Tech Uk Ltd | Acoustic resonator sensor for determining temperature |
| CN105953980B (en) * | 2016-04-29 | 2018-08-17 | 维沃移动通信有限公司 | A kind of method and mobile terminal of test chamber leakproofness |
| CN106788538B (en) * | 2016-12-27 | 2018-12-18 | 广东小天才科技有限公司 | A kind of control method and wearable device of wearable device |
| CN107071148B (en) * | 2017-03-09 | 2020-02-25 | 深圳虹川科技有限公司 | Atmospheric pressure data acquisition and processing method and terminal |
| CN106878868A (en) * | 2017-03-30 | 2017-06-20 | 维沃移动通信有限公司 | A kind of control device of loudspeaker, method and mobile terminal |
| US10623867B2 (en) * | 2017-05-01 | 2020-04-14 | Apple Inc. | Combined ambient pressure and acoustic MEMS sensor |
| US10638217B2 (en) * | 2018-09-27 | 2020-04-28 | Apple Inc. | Pressure-responsive sensors and related systems and methods |
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