Outdoor microphone and environmental factor comprehensive compensation method thereof

Abstract

The application discloses an outdoor microphone and an environmental factor comprehensive compensation method thereof. The outdoor microphone comprises a hollow support rod, a microphone assembly arranged in the hollow support rod, and a sound monitoring end of the microphone assembly extending out of one end of the hollow support rod. A protective cylinder cover is detachably connected to one end of the hollow support rod, and a rainproof cap is fixed to the other end of the protective cylinder cover. A plurality of sound inlet holes are uniformly distributed on the cylinder wall of the protective cylinder cover below the rainproof cap, and the sound monitoring end extends into the sound inlet holes through the other end of the protective cylinder cover. A waterproof membrane sleeve is arranged on the cylinder wall of the protective cylinder cover and corresponds to the sound inlet holes. A sponge wind shield is arranged on the protective cylinder cover and one end of the hollow support rod, and the waterproof membrane sleeve is arranged in the sponge wind shield. The outdoor microphone can effectively prevent wind and water in an outdoor environment, thereby effectively avoiding the problem that the outdoor microphone is easily affected by the outdoor environment during use and the measurement data is poor in validity.

Description

Technical Field

[0001] This invention relates to the field of signal acquisition technology, and more specifically to an outdoor microphone for acquiring outdoor noise that can be used in complex outdoor environments, and a method for comprehensive compensation of environmental factors. Background Technology

[0002] With the increasing emphasis placed on environmental protection by the government and society, outdoor environmental noise has gradually become an important indicator to be considered in urban development, environmental protection, and noise control and management. While people have long focused on controlling air and water pollution, they have often neglected noise pollution. In fact, high-decibel noise not only impairs hearing but also has adverse effects on the urban environment.

[0003] Most existing outdoor microphones cannot achieve a high waterproof rating, making measurements susceptible to humidity, high and low temperatures, and air pressure changes during use. This results in unstable measured parameters, compromising the validity of the measurement data and consequently affecting the assessment of noise compliance.

[0004] Therefore, how to provide an outdoor microphone that can effectively resist wind and water in outdoor environments and automatically adjust the internal temperature, humidity and other environmental factors of the microphone through a built-in heating mesh, so as to make outdoor sound measurement work more stable, and the comprehensive compensation method for environmental factors is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an outdoor microphone that is effectively windproof and waterproof in outdoor environments, and automatically adjusts the internal temperature, humidity and other environmental factors of the microphone through a built-in heating mesh, thereby making outdoor sound measurement work more stable, and a comprehensive compensation method for environmental factors.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An outdoor microphone, comprising:

[0008] Hollow support rod;

[0009] A microphone assembly is disposed inside the hollow support rod, and the sound monitoring end of the microphone assembly extends out of one end of the hollow support rod.

[0010] A protective cylinder cover, one end of which is detachably connected to one end of the hollow support rod, and a rain cap is fixed to the other end of the protective cylinder cover. Multiple sound inlet holes are evenly distributed around the cylinder wall of the protective cylinder cover below the rain cap. The sound monitoring end extends through the other end of the protective cylinder cover to the position of the sound inlet hole.

[0011] A waterproof membrane sleeve is fitted onto the wall of the protective cylinder cover and corresponds to the position of the sound inlet hole;

[0012] A sponge windproof cover is fitted over the protective cylinder cover and one end of the hollow support rod, and a waterproof membrane cover is located inside the sponge windproof cover.

[0013] As can be seen from the above technical solution, compared with the prior art, this invention discloses an outdoor microphone with multiple sound inlets on the protective cap, providing a larger sound intake area, reducing the impact on frequency response, and offering good sound transmission. This allows the internal microphone components to more accurately collect ambient sound, resulting in more accurate measurement data and facilitating future environmental analysis and monitoring. Furthermore, in addition to the rain cap, a waterproof membrane cover is used to further enhance the outdoor microphone's waterproof performance, ensuring more stable measurement performance under different weather conditions and guaranteeing the accuracy of test data. Simultaneously, the addition of a sponge windproof cover provides excellent wind protection, and the good sound transmission of the sponge windproof cover facilitates the microphone components' collection of outdoor ambient sound. Therefore, this outdoor microphone is effectively windproof and waterproof in outdoor environments, thus effectively avoiding the problem of poor measurement data reliability caused by the influence of the outdoor environment during use.

[0014] Furthermore, the microphone assembly includes:

[0015] A multi-core external interface is provided, which is detachably connected to the other end of the hollow support rod for electrical connection with external devices.

[0016] A circuit board, which is disposed inside the hollow support rod and electrically connected to the multi-core external interface;

[0017] A microphone, one end of which is placed inside the hollow support rod and electrically connected to the circuit board via a BNC interface, and the other end of which is the sound monitoring end.

[0018] Furthermore, a first heating mesh is attached to the inner wall of the protective cover at a position corresponding to the lower part of the sound monitoring end, and the first heating mesh is electrically connected to the circuit board.

[0019] Furthermore, a second heating mesh and a third heating mesh are respectively attached to the inner wall of the hollow support rod at the positions corresponding to the circuit board and the microphone, and both the second heating mesh and the third heating mesh are electrically connected to the circuit board.

[0020] The beneficial effect of adopting the above technical solution is that the first heating cylinder mesh, the second heating cylinder mesh, and the third heating cylinder mesh can heat various parts of the outdoor microphone, so as to adjust the internal temperature, humidity, and other working factors of the microphone components, making the outdoor sound measurement more stable and accurate.

[0021] Furthermore, the circuit board is equipped with a miniature temperature sensor, a miniature humidity sensor, a miniature air pressure sensor, and a miniature controller. The miniature temperature sensor, the miniature humidity sensor, the miniature air pressure sensor, the first heating cylinder mesh, the second heating cylinder mesh, and the third heating cylinder mesh are all electrically connected to the miniature controller.

[0022] The beneficial effect of adopting the above technical solution is that, by adding a heating cylinder mesh inside and intelligently controlling the working state of the heating cylinder mesh through a microcontroller, the frequency response curve of the outdoor microphone is not affected by changes in outdoor ambient temperature and humidity, thus preventing frequency distortion.

[0023] Furthermore, the circuit board is also equipped with a signal filtering module and a controllable amplifier, both of which are electrically connected to the microcontroller. The signal filtering module is electrically connected to the micro temperature sensor, the micro humidity sensor, and the micro pressure sensor, and the microphone is electrically connected to the controllable amplifier.

[0024] The beneficial effects of adopting the above technical solution are that the signal filtering module can filter out random fluctuation signals from the signals measured by the miniature temperature sensor, miniature humidity sensor, and miniature barometric pressure sensor, transmit stable measurement data to the microcontroller, improve the accuracy of the measurement data, and achieve stable output of the outdoor microphone's measurement output data under a wide range of adverse environmental conditions through a controllable amplifier.

[0025] Furthermore, one end of the protective sleeve cap is threaded to one end of the hollow support rod, the outer wall of the BNC interface is threaded to the inner wall of the hollow support rod, and the multi-core external interface is threaded to the other end of the hollow support rod.

[0026] The beneficial effect of adopting the above technical solution is that it facilitates the quick assembly and disassembly of outdoor microphone components.

[0027] Furthermore, one end of the microphone is detachably connected to the BNC interface.

[0028] Furthermore, two guide mounting protrusions are symmetrically integrally formed on the outer wall of one end of the microphone, and two downwardly inclined guide slide holes are opened opposite each other on the outer wall of the BNC interface. One end of the guide slide hole is provided with a protrusion entry notch, and the other end of the guide slide hole is an upwardly inclined protrusion stop port. The protrusion stop port is arranged lower than the protrusion entry notch. The two guide mounting protrusions are slidably connected to the corresponding inclined guide slide holes through the protrusion entry notches and are locked at the position of the protrusion stop port.

[0029] The beneficial effect of adopting the above technical solution is that when the BNC interface is installed on the microphone, the two guide mounting protrusions are slidably connected to the corresponding inclined guide slide holes through the protrusion entry notch. At this time, the BNC interface is rotated so that the guide mounting protrusions are locked at the protrusion stop position, thus completing the quick installation of the two.

[0030] This invention provides a method for comprehensive environmental factor compensation for outdoor microphones, comprising the following steps:

[0031] Step S1: Conduct an environmental factor influence test on the microphone indoors according to the national standard test method and test device to obtain the static pressure coefficient ap, temperature coefficient at, and relative humidity coefficient ah of the microphone sound pressure sensitivity level, and input them to the micro controller.

[0032] Step S2: Place the outdoor microphone outdoors and collect the outdoor environment temperature T, humidity H, and air pressure P data in real time. After the data is filtered by the signal filtering module, it is transmitted to the micro controller. The micro controller performs the following compensation method based on its internal preset data and the collected data.

[0033] First, the microcontroller determines whether the temperature T, humidity H, and air pressure P exceed the preset allowable range. If they exceed the range, it interrupts the operation of the controllable amplifier and issues an alarm signal at the output interface. If an over-limit situation exists, it determines whether the over-limit is caused by low temperature or high humidity. If so, it activates the first, second, and third heating cylinders; otherwise, it continues to wait. After activating the first, second, and third heating cylinders, it also checks whether the temperature rises to the over-limit range. If it does, it stops heating to protect the instrument. If no over-limit situation exists, the microcontroller calculates compensation amounts for temperature, humidity, and air pressure separately using the formulas vt = (T - T0) * at, vh = (H - H0) * ah, and vp = (P - P0) * ap. These individual compensation amounts are then summed to obtain the comprehensive compensation amount. The compensation amount is then converted into controllable amplifier parameter adjustment amounts and sent to the controllable amplifier to adjust its gain, thereby ensuring that the controllable amplifier's output remains in a deviation-free state.

[0034] The beneficial effects of adopting the above technical solution are that, through the comprehensive environmental factor compensation method proposed in this invention, the main method is to control the heating modules (first heating cylinder mesh, second heating cylinder mesh and third heating cylinder mesh) to achieve dehumidification and heating in low-temperature environments. The adjustment amount for temperature, humidity and air pressure changes is calculated based on the static pressure coefficient, temperature coefficient and relative humidity coefficient, and then applied to the controllable amplifier. This method enables the outdoor microphone to output stable measurement data under a wide range of adverse environmental conditions, making the outdoor sound measurement work of the outdoor microphone more stable. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1 The attached figure is a schematic diagram of the assembly structure of an outdoor microphone provided by the present invention.

[0037] Figure 2 The attached image is... Figure 1 A schematic diagram of the front view cross-section structure.

[0038] Figure 3 The attached image is... Figure 1 A schematic diagram of its decomposed structure.

[0039] Figure 4 The attached diagram shows the structure after the waterproof membrane cover, sponge windproof cover, and protective cylinder cap have been separated.

[0040] Figure 5 The attached diagram shows the assembly structure of the protective cap and the microphone.

[0041] Figure 6 The attached image is... Figure 5 A schematic diagram of the front view cross-section structure.

[0042] Figure 7 The attached image is... Figure 6 A magnified schematic diagram of the structure of part A in the middle.

[0043] Figure 8 The attached diagram shows the corresponding positions of the heating microphones in the first and third heating cylinder meshes.

[0044] Figure 9 The attached diagram shows a schematic of the microphone and BNC interface assembly structure.

[0045] Figure 10The attached diagram is a schematic diagram of the microphone.

[0046] Figure 11 The attached diagram is a first-person view of the BNC interface.

[0047] Figure 12 The attached diagram is a structural schematic diagram of the BNC interface from a second-view perspective.

[0048] Figure 13 The attached diagram is a flowchart of the comprehensive compensation method for environmental factors. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] See Figures 1-13 This invention discloses an outdoor microphone, comprising:

[0051] Hollow support rod 1;

[0052] Microphone assembly 2 is disposed inside the hollow support rod 1, and the sound monitoring end 231 of the microphone assembly 2 extends out of one end of the hollow support rod 1.

[0053] The protective cylinder cover 3 is detachably connected to one end of the hollow support rod 1. The other end of the protective cylinder cover 3 is fixed with a rain cap 4. Multiple sound inlet holes 301 are evenly distributed around the cylinder wall of the protective cylinder cover 3 below the rain cap 4. The sound monitoring end 231 extends through the other end of the protective cylinder cover 3 to the position of the sound inlet hole 301.

[0054] Waterproof membrane sleeve 5 is fitted onto the cylinder wall of protective cylinder cover 3 and corresponds to the position of sound inlet 301;

[0055] The sponge windproof cover 6 is fitted onto the protective cylinder cover 3 and one end of the hollow support rod 1, and the waterproof membrane cover 5 is located inside the sponge windproof cover 6.

[0056] Among them, the rain cap 4 can adopt a conical structure, with the diameter of its large round end being larger than the diameter of the protective cylinder cover where the sound inlet is located, thus providing good rain protection; and the small round end of the rain cap can be integrally formed with a bird-proof spike with a pointed top to prevent birds from landing on the outdoor microphone and affecting its sound measurement work.

[0057] Microphone assembly 2 includes:

[0058] The multi-core external interface 21 is detachably connected to the other end of the hollow support rod 1 and is used for electrical connection with external devices.

[0059] Circuit board 22 is disposed inside the hollow support rod 1 and is electrically connected to the multi-core external interface 21.

[0060] Microphone 23, one end of which is placed inside the hollow support rod 1 and is electrically connected to the circuit board 22 through the BNC interface 24. The other end of the microphone 23 is the sound monitoring end 231.

[0061] A first heating cylinder mesh 7 is attached to the inner wall of the protective cylinder cover 3 at the position below the sound monitoring end 231. The first heating cylinder mesh 7 is electrically connected to the circuit board 22.

[0062] Microphone 23 uses a standard microphone, which avoids the need to develop a dedicated outdoor microphone unit and greatly improves its applicability.

[0063] On the inner wall of the hollow support rod 1, at positions corresponding to the circuit board 22 and the microphone 23, a second heating cylinder mesh 8 and a third heating cylinder mesh 9 are respectively attached. Both the second heating cylinder mesh 8 and the third heating cylinder mesh 9 are electrically connected to the circuit board 22.

[0064] The first heating cylinder mesh 7, the second heating cylinder mesh 8, and the third heating cylinder mesh 9 are all made of metal, which has high heating efficiency and fast heat conduction, and can quickly dehumidify the internal environment of the outdoor microphone.

[0065] The circuit board 22 is equipped with a miniature temperature sensor 10, a miniature humidity sensor 11, a miniature air pressure sensor 12, and a miniature controller 13. The miniature temperature sensor 10, the miniature humidity sensor 11, the miniature air pressure sensor 12, the first heating cylinder mesh 7, the second heating cylinder mesh 8, and the third heating cylinder mesh 9 are all electrically connected to the miniature controller 13.

[0066] The circuit board 22 is equipped with a miniature temperature sensor 10, a miniature humidity sensor 11, and a miniature air pressure sensor 12, which have the function of sensing the environment. In conjunction with the heating grid, the micro controller can automatically adjust the temperature of the heating grid by changes in temperature and humidity, thereby adjusting the working environment inside the outdoor microphone, so that the test can be carried out in a relatively stable environment, which greatly improves the accuracy and stability of the test.

[0067] As an alternative, the microcontroller has an internal analog-to-digital converter that digitizes the analog signals obtained from the microphone test and then transmits them to the subsequent equipment via a multi-core interface. The multi-core interface provides the subsequent acquisition equipment with a variety of data types to choose from, which greatly improves the applicability of the outdoor microphone.

[0068] The circuit board 22 is also equipped with a signal filtering module 14 and a controllable amplifier 15, which are electrically connected to the microcontroller 13. The signal filtering module 14 is electrically connected to the micro temperature sensor 10, the micro humidity sensor 11, and the micro air pressure sensor 12. The microphone 23 is electrically connected to the controllable amplifier 15.

[0069] One end of the protective cylinder cover 3 is threaded to one end of the hollow support rod 1, the outer wall of the BNC interface 24 is threaded to the inner wall of the hollow support rod 1, and the multi-core external interface 21 is threaded to the other end of the hollow support rod 1.

[0070] One end of the microphone 23 is detachably connected to the BNC interface 24.

[0071] Specifically, two guide mounting protrusions 232 are symmetrically integrally formed on the outer wall of one end of the microphone 23. Two downwardly inclined guide slide holes 241 are opened opposite each other on the outer wall of the BNC interface 24. One end of the guide slide hole 241 is provided with a protrusion entry notch 2411, and the other end of the guide slide hole 241 is an upwardly inclined protrusion stop port 2412. The protrusion stop port 2412 is arranged lower than the protrusion entry notch 2411. The two guide mounting protrusions 232 are slidably connected to the corresponding inclined guide slide holes 241 through the protrusion entry notch 2411 and are locked at the position of the protrusion stop port 2412.

[0072] The present invention provides a method for comprehensive environmental factor compensation for an outdoor microphone, comprising the following steps:

[0073] Step S1: Conduct an environmental factor influence test on the microphone 23 indoors according to the national standard test method and test device, obtain the static pressure coefficient ap, temperature coefficient at, and relative humidity coefficient ah of the sound pressure sensitivity level of the microphone 23, and input them to the microcontroller 13.

[0074] Step S2: Place the outdoor microphone outdoors and collect the outdoor environment temperature T, humidity H, and air pressure P data in real time. After the data is filtered by the signal filtering module 14, it is transmitted to the microcontroller 13. The microcontroller 13 performs the following compensation method based on its internal preset data and the collected data.

[0075] First, the microcontroller 13 determines whether the temperature T, humidity H, and air pressure P exceed the preset allowable range. If they exceed the range, it interrupts the operation of the controllable amplifier and issues an alarm signal at the output interface. If an over-limit situation exists, it determines whether the over-limit is caused by low temperature or high humidity. If so, it activates the first heating cylinder mesh 7, the second heating cylinder mesh 8, and the third heating cylinder mesh 9; otherwise, it continues to wait. After activating the first heating cylinder mesh 7, the second heating cylinder mesh 8, and the third heating cylinder mesh 9, it is necessary to check whether the temperature rises to the over-limit range. If it does, heating is stopped to protect the instrument. If no over-limit situation exists, the microcontroller calculates the compensation amount for temperature, humidity, and air pressure separately using the formulas vt = T - T0 * at, vh = H - H0 * ah, vp = P - P0 * ap. The individual compensation amounts are then summed to calculate the comprehensive compensation amount. The compensation amount is then converted into a controllable amplifier parameter adjustment amount and sent to the controllable amplifier to adjust the gain of the controllable amplifier, thereby ensuring that the output of the controllable amplifier is always in a deviation-free state.

[0076] This invention proposes a novel outdoor microphone that overcomes the shortcomings of existing outdoor microphones, such as unreliable wind and water resistance and susceptibility to temperature, humidity, and external air pressure conditions. It provides an outdoor microphone that is effectively wind and water resistant in outdoor environments and automatically adjusts internal temperature, humidity, and other environmental factors through a built-in heating grid, making outdoor sound measurement more stable.

[0077] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0078] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An outdoor microphone, characterized in that, include: Hollow support rod (1); Microphone assembly (2), the microphone assembly (2) is disposed inside the hollow support rod (1), and the sound monitoring end (231) of the microphone assembly (2) extends out of one end of the hollow support rod (1); A protective cylinder cover (3) is provided. One end of the protective cylinder cover (3) is detachably connected to one end of the hollow support rod (1). A rain cap (4) is fixed to the other end of the protective cylinder cover (3). Multiple sound inlets (301) are evenly distributed around the cylinder wall of the protective cylinder cover (3) below the rain cap (4). The sound monitoring end (231) extends through the other end of the protective cylinder cover (3) to the position of the sound inlet (301). Waterproof membrane sleeve (5), the waterproof membrane sleeve (5) is sleeved on the cylinder wall of the protective cylinder cover (3) and corresponds to the position of the sound inlet (301); Sponge windproof cover (6), the sponge windproof cover (6) is sleeved on the protective cylinder cover (3) and one end of the hollow support rod (1), and the waterproof membrane sleeve (5) is located inside the sponge windproof cover (6); The microphone assembly (2) includes: A multi-core external interface (21) is detachably connected to the other end of the hollow support rod (1) for electrical connection with external equipment; Circuit board (22), the circuit board (22) is disposed inside the hollow support rod (1) and is electrically connected to the multi-core external interface (21); Microphone (23), one end of which is placed inside the hollow support rod (1) and is electrically connected to the circuit board (22) through a BNC interface (24), and the other end of which is the sound monitoring end (231); A first heating cylinder mesh (7) is attached to the inner wall of the protective cylinder cover (3) at a position below the sound monitoring end (231), and the first heating cylinder mesh (7) is electrically connected to the circuit board (22); The hollow support rod (1) has a second heating cylinder mesh (8) and a third heating cylinder mesh (9) attached to the inner wall of the hollow support rod (1) at the positions corresponding to the circuit board (22) and the microphone (23), respectively. The second heating cylinder mesh (8) and the third heating cylinder mesh (9) are electrically connected to the circuit board (22). The circuit board (22) is provided with a miniature temperature sensor (10), a miniature humidity sensor (11), a miniature air pressure sensor (12), and a miniature controller (13). The miniature temperature sensor (10), the miniature humidity sensor (11), the miniature air pressure sensor (12), the first heating cylinder mesh (7), the second heating cylinder mesh (8), and the third heating cylinder mesh (9) are all electrically connected to the miniature controller (13). The circuit board (22) is also provided with a signal filtering module (14) and a controllable amplifier (15) that are electrically connected to the micro controller (13). The signal filtering module (14) is electrically connected to the micro temperature sensor (10), the micro humidity sensor (11), and the micro air pressure sensor (12). The microphone (23) is electrically connected to the controllable amplifier (15). One end of the protective cylinder cover (3) is threaded to one end of the hollow support rod (1), the outer wall of the BNC interface (24) is threaded to the inner wall of the hollow support rod (1), and the multi-core external interface (21) is threaded to the other end of the hollow support rod (1). One end of the microphone (23) is detachably connected to the BNC interface (24).

2. An outdoor microphone according to claim 1, characterized in that, Two guide mounting protrusions (232) are symmetrically integrally formed on the outer wall of one end of the microphone (23). Two downwardly inclined guide slide holes (241) are opened opposite each other on the outer wall of the BNC interface (24). One end of the guide slide hole (241) is provided with a protrusion entry notch (2411), and the other end of the guide slide hole (241) is an upwardly inclined protrusion stop port (2412). The protrusion stop port (2412) is arranged lower than the protrusion entry notch (2411). The two guide mounting protrusions (232) are slidably connected to the corresponding inclined guide slide holes (241) through the protrusion entry notch (2411) and are locked at the position of the protrusion stop port (2412).

3. A comprehensive environmental factor compensation method for an outdoor microphone as described in claim 1, characterized in that, Includes the following steps: Step S1: Conduct an environmental factor influence test on the microphone (23) indoors to obtain the static pressure coefficient ap, temperature coefficient at, and relative humidity coefficient ah of the sound pressure sensitivity level of the microphone (23), and input them to the micro controller (13). Step S2: Place the outdoor microphone outdoors and collect the outdoor environment temperature T, humidity H and air pressure P data in real time. After the data is filtered by the signal filtering module (14), it is transmitted to the micro controller (13). The micro controller (13) performs the following compensation method according to its internal preset data and the collected data. First, the microcontroller (13) determines whether the temperature T, humidity H, and air pressure P exceed the allowable range of preset data. If they exceed the range, the controllable amplifier is interrupted and an alarm signal is issued at the output interface. If there is an over-limit situation, it is determined whether the over-limit is caused by low temperature or high humidity. If so, the first heating cylinder mesh (7), the second heating cylinder mesh (8), and the third heating cylinder mesh (9) are activated. Otherwise, it continues to wait. After activating the first heating cylinder mesh (7), the second heating cylinder mesh (8), and the third heating cylinder mesh (9), it is also necessary to pay attention to the judgment. If the temperature rises above the limit, heating is stopped to protect the instrument. If the temperature does not exceed the limit, the microcontroller calculates compensation for temperature, humidity, and air pressure separately using the formulas vt = (T - T0) * at, vh = (H - H0) * ah, and vp = (P - P0) * ap. The microcontroller then sums these compensations to obtain the overall compensation. Finally, the compensation is converted into a controllable amplifier parameter adjustment value and sent to the controllable amplifier to adjust its gain, thereby ensuring that the output of the controllable amplifier is always in a deviation-free state.

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