Methods and system for sending and receiving low-frequency sound signal

Abstract

Disclosed in the present invention are methods and a system for sending and receiving a low-frequency sound signal. The sending method comprises: converting, according to a preset vibrating diaphragm, a sound signal emitted by a device awaiting detection into a micro-vibration signal; superimposing a preset infrasonic signal onto the micro-vibration signal to obtain a mixed signal; and optimizing and sending the mixed signal according to the current ambient noise condition. The receiving method comprises: adjusting a signal receiving parameter according to the current ambient noise condition; capturing the mixed signal within a preset detection range according to the signal receiving parameter; and restoring, from the mixed signal, the sound signal emitted by the device awaiting detection. In the present application, a low-frequency sound signal emitted by a device is converted into a micro-vibration signal by means of a special vibrating diaphragm, thereby achieving stable transmission of the low-frequency sound signal.

Description

Method and system for transmitting and receiving low-frequency sound signal TECHNICAL FIELD

[0001] The application belongs to the technical field of low-frequency sound signal transmission, and particularly relates to a method and system for transmitting and receiving low-frequency sound signal. BACKGROUND

[0002] Commonly used loudspeakers based on human ear design generally emit a high-decibel buzzing sound when the device malfunctions to remind the operator. However, with the current production of unmanned factories, unmanned production lines, and especially the gradual mass production of humanoid robots, the "object-object interaction" is generally used in the unmanned environment, and the high-frequency alarm sound emitted by the loudspeaker is only useful for reminding the human ear and will also cause noise pollution. Therefore, how to detect and analyze the low-noise pollution of these devices and components is a major technical problem.

[0003] However, when the device is abnormal, multiple components in the device may emit sound at the same time, causing sound clutter and causing large noise pollution, so that the detection and analysis work becomes complex. Moreover, the low-frequency sound signal transmission process is easily disturbed by environmental changes, resulting in signal distortion and inaccurate reception. SUMMARY

[0004] The application provides a method and system for transmitting and receiving low-frequency sound signal, which converts the low-frequency sound signal emitted by the device into a micro-vibration signal through a special diaphragm, and realizes stable transmission of the low-frequency sound signal.

[0005] The first aspect of the application provides a method for transmitting low-frequency sound signal, which comprises:

[0006] According to the preset diaphragm, the sound signal emitted by the device to be detected is converted into a micro-vibration signal;

[0007] The preset infrasound signal is superimposed into the micro-vibration signal to obtain a mixed signal;

[0008] According to the current environmental noise, the mixed signal is optimized and transmitted.

[0009] The above scheme uses a diaphragm to convert a sound signal into a micro-vibration signal. Because the frequency of the micro-vibration signal is extremely low and cannot be heard by the human ear, it will not cause noise pollution. Then, the micro-vibration signal is modulated using an infrasound signal to enhance the penetration and propagation distance of the signal, and to improve the stability and reliability of the micro-vibration signal transmission. At the same time, the mixed signal is optimized to improve the anti-interference ability of the mixed signal in the propagation process, and the stable transmission of the low-frequency sound signal is realized as a whole.

[0010] In a possible implementation method of the first aspect, the sound signal emitted by the to-be-detected device is converted into a micro-vibration signal according to a preset diaphragm, and specifically:

[0011] The sound signal is converted into mechanical vibration of the diaphragm to obtain the micro-vibration signal; and the effect of the mechanical vibration can be optimized by adjusting the geometric shape and thickness of the diaphragm.

[0012] The above scheme converts the sound signal into a micro-vibration signal that cannot be heard by human ears through mechanical vibration of the diaphragm, avoiding direct exposure of the sound to cause noise pollution. Moreover, the vibration energy generated by the mechanical vibration can be more concentrated by adjusting the structure of the diaphragm, and a more robust micro-vibration signal is obtained.

[0013] In a possible implementation method of the first aspect, a preset infrasound signal is superimposed into the micro-vibration signal to obtain a mixed signal, and specifically:

[0014] According to a preset signal modulation mode, audio information corresponding to the micro-vibration signal is encoded into the infrasound signal to obtain the mixed signal.

[0015] The above scheme modulates the micro-vibration signal by the infrasound signal, enhances the penetration and propagation distance of the micro-vibration signal by the characteristics of the infrasound signal, and ensures that the signal can be accurately received.

[0016] In a possible implementation method of the first aspect, the mixed signal is optimized and sent according to the current environmental noise, and specifically:

[0017] According to the current environmental noise, a signal enhancement strategy is constructed;

[0018] The infrasound signal in the mixed signal is optimized by the signal enhancement strategy to obtain an optimized mixed signal and send the optimized mixed signal.

[0019] In the above scheme, the infrasound signal is optimized according to the environmental change to improve the anti-interference ability and anti-attenuation ability of the mixed signal.

[0020] The second aspect of the present application provides a low-frequency sound signal sending device, comprising: a signal conversion module, a signal modulation module and a signal sending module;

[0021] The signal conversion module is configured to convert the sound signal emitted by the to-be-detected device into a micro-vibration signal according to a preset diaphragm;

[0022] The signal modulation module is configured to superimpose a preset infrasound signal into the micro-vibration signal to obtain a mixed signal;

[0023] The signal sending module is configured to optimize and send the mixed signal according to the current environmental noise condition.

[0024] The third aspect of the present application provides a receiving method of low-frequency sound signals, comprising:

[0025] Adjusting signal receiving parameters according to the current environmental noise condition;

[0026] Capturing mixed signals within a preset detection range according to the signal receiving parameters;

[0027] Restoring sound signals emitted by the device to be detected from the mixed signals, so that the component condition of the device to be detected is obtained through the sound signals.

[0028] The above scheme monitors and analyzes environmental noise and interference conditions, automatically adjusts signal receiving parameters to optimize signal receiving effect. Then, within the set receiving range, micro-vibration signals and infrasound signals in the environment are captured and distinguished, mixed signals containing audio information of the device to be detected are obtained, sound signals emitted by the device to be detected are extracted and restored from the mixed signals, and corresponding audio information is obtained for accurately determining the fault problem of the components of the device to be detected, realizing covert receiving and restoration of sound.

[0029] In a possible implementation method of the third aspect, the signal receiving parameters are adjusted according to the current environmental noise condition, specifically:

[0030] Real-time collection and processing of environmental sound signals are performed to obtain the current environmental interference condition;

[0031] According to the environmental interference condition, the frequency band and period of signal receiving are set.

[0032] In a possible implementation method of the third aspect, the sound signals emitted by the device to be detected are restored from the mixed signals, specifically:

[0033] The mixed signals are decoded and processed to extract the sound signals emitted by the device to be detected;

[0034] The sound signals are de-noised and de-interfered to obtain the audio information of the device to be detected.

[0035] The fourth aspect of the present application provides a receiving device of low-frequency sound signals, comprising a parameter adjustment module, a signal capturing module and a signal receiving module.

[0036] The parameter adjustment module is configured to adjust signal receiving parameters according to the current environmental noise condition;

[0037] The signal capturing module is configured to capture mixed signals within a preset detection range according to the signal receiving parameters;

[0038] The signal receiving module is used to restore the sound signal emitted by the to-be-detected device from the mixed signal, so as to obtain the component condition of the to-be-detected device through the sound signal.

[0039] The fifth aspect of the present application provides a low-frequency sound signal sending and receiving system, comprising: a low-frequency sound signal sending device and a receiving device.

[0040] The sending device is used to execute the low-frequency sound signal sending method in any one of the embodiments of the present application.

[0041] The receiving device is used to execute the low-frequency sound signal receiving method in any one of the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0043] Fig. 1 is a specific flowchart of a low-frequency sound signal sending method according to an embodiment of the present application;

[0044] Fig. 2 is a specific flowchart of a low-frequency sound signal receiving method according to an embodiment of the present application;

[0045] Fig. 3 is a structure diagram of a low-frequency sound signal sending and receiving system according to an embodiment of the present application. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0047] It should be understood that the step numbers used herein are only for the convenience of description, and are not limited to the execution sequence of the steps.

[0048] First embodiment

[0049] The existing device detection method usually enlarges the sound emitted by the component through a loudspeaker to prompt the maintenance personnel that the component has a problem. However, the loudspeaker is designed based on the hearing range of the human ear, and the sound emitted by the component will be converted into a harsh and high-decibel buzzing sound, causing certain noise pollution. Moreover, the signal power emitted by the loudspeaker is small, and the propagation distance is short, and noise reduction and filtering steps are required to restore the original sound signal, so the steps are complex, and the signal is easily disturbed by environmental changes during transmission, resulting in signal distortion and inaccurate reception.

[0050] As shown in FIG. 1, FIG. 1 is a specific flowchart of a low-frequency sound signal transmission method provided by an embodiment of the present application. The low-frequency sound signal transmission method of the embodiment includes steps S1 to S3, which are described in detail as follows.

[0051] In step S1, the sound signal emitted by the device to be detected is converted into a micro-vibration signal according to a pre-set diaphragm.

[0052] In the embodiment of the present application, a low-frequency loudspeaker with a diaphragm is used to convert the sound signal emitted by the device into a micro-vibration signal. Specifically, the electrical signal (i.e., the sound signal) emitted by the device during operation is converted into mechanical vibration, and then micro-vibration sound waves are generated. The frequency of these micro-vibration sound waves is extremely low, far below the human hearing range, so the human ear cannot directly hear them, and they do not cause noise pollution during the propagation of the micro-vibration signal. Since the human hearing range is generally 20 hz to 20 khz, the frequency of the micro-vibration sound waves is usually below 20 hz, and the micro-vibration sound waves can propagate through solid and liquid media.

[0053] The diaphragm is made of special materials, which are generally selected from materials with high elasticity, low density, and good vibration characteristics, such as certain high-molecular polymers or composite materials. These materials can generate efficient micro-vibration under the drive of the electrical signal to obtain the micro-vibration signal. In the embodiment of the present application, the design of the diaphragm considers the elasticity, density, and vibration mode optimization of the material to ensure efficient generation and propagation of the micro-vibration signal.

[0054] Optionally, the piezoelectric effect or electromagnetic drive is used to convert the sound signal into mechanical vibration of the diaphragm. Under the piezoelectric effect, the diaphragm will deform under the action of the electric field, thereby generating vibration; and the electromagnetic drive drives the diaphragm to vibrate by the force of the current in the magnetic field.

[0055] Further, if a better mechanical vibration effect is desired to make the vibration energy more concentrated to enable the micro-vibration signal to propagate more efficiently, the vibration mode can be optimized by designing the geometric shape, thickness, and support structure parameters of the diaphragm.

[0056] Step S2, superimposing the preset infrasound signal to the micro-vibration signal to obtain a mixed signal.

[0057] In the embodiment of the present application, the micro-vibration signal obtained is modulated and enhanced on the basis of the preset infrasound signal, so as to realize the covert transmission of information and enhance the penetration and propagation distance of the signal.

[0058] Because the micro-vibration signal is generally lower than 20hz, the infrasound signal selected in the embodiment of the present application is an infrasound signal lower than 20hz. The infrasound signal is generated by using an ultrasonic transducer or an oscillator of a specific frequency. The ultrasonic transducer generates ultrasonic waves through high-frequency vibration, and these ultrasonic waves will generate nonlinear effects when propagating in the medium, thereby generating infrasound.

[0059] For example, in the embodiment of the present application, the audio information corresponding to the micro-vibration signal is encoded into the infrasound signal by using frequency modulation, phase modulation or amplitude modulation, so as to ensure that the audio information will not be destroyed and distorted during the propagation process, thereby realizing the covert transmission of information.

[0060] In addition, the embodiment of the present application also superimposes the infrasound signal on the basis of the micro-vibration signal, so as to enhance the penetration and propagation distance of the signal.

[0061] The audio information refers to the information to be transmitted, for example, the information such as "high temperature", "wear" and "danger" of the component needs to be expressed by the sound wave of the sound signal.

[0062] After completing the signal modulation, a mixed signal is obtained. Compared with the original micro-vibration signal, the mixed signal has better penetration and propagation distance.

[0063] Step S3, optimizing and sending the mixed signal according to the current environmental noise.

[0064] In the embodiment of the present application, a reasonable sound field distribution and signal amplification circuit are designed according to the current environmental noise, so as to reduce signal attenuation and interference, enhance the strength and penetration of the infrasound signal in the mixed signal, and improve the stability and reliability of the mixed signal.

[0065] Finally, the optimized mixed signal is sent to a receiving device, which is used for component fault detection of the to-be-detected equipment.

[0066] The embodiment of the present application has the following beneficial effects:

[0067] The embodiment of the present application converts the sound signal into a micro-vibration signal by using a diaphragm made of special material. The frequency of the micro-vibration signal is extremely low and cannot be heard by human ears, and thus cannot cause noise pollution. Then, the micro-vibration signal is modulated and enhanced by using an infrasound signal, the infrasound signal and the micro-vibration signal are superimposed, the penetration and propagation distance of the enhanced signal are enhanced, and the stability and reliability of the micro-vibration signal transmission are improved. At the same time, the mixed signal is optimized to improve the anti-interference ability of the mixed signal in the propagation process, and the stable transmission of the low-frequency sound signal is realized as a whole.

[0068] Second embodiment

[0069] Further, FIG. 2 provides a specific flowchart of a receiving method of a low-frequency sound signal. The receiving method of the low-frequency sound signal provided by the embodiment of the present application includes steps S1 to S3, and the details are as follows:

[0070] Step S1, adjusting the signal receiving parameters according to the current environmental noise.

[0071] In the embodiment of the present application, the environmental noise and interference are monitored and analyzed in real time, and the signal receiving parameters are automatically adjusted to optimize the signal receiving effect, so as to accurately receive the signal by automatically adapting to the environmental changes. Among them, the frequency band and period of signal receiving are set by collecting environmental sound signals and performing frequency spectrum analysis, noise estimation and other processing, to provide data support for subsequent signal receiving.

[0072] Further, the frequency band of signal receiving is generally a low-frequency band, so as to ensure that the non-micro-vibration signal and the infrasound signal of medium frequency and high frequency can be automatically filtered. Moreover, because the signal sending end is generally specially modulated, the sound wave emitted is relatively regular, and irregular signals can be filtered out, so a certain period can be set to ensure that the mixed signal can be regularly received.

[0073] Step S2, capturing the mixed signal in the preset detection range according to the signal receiving parameters.

[0074] In the embodiment of the present application, then, the micro-vibration signal and the infrasound signal in the environment, i.e. the mixed signal sent, are captured and distinguished in the set receiving range.

[0075] For example, in the embodiment of the present application, high-sensitivity microphones or vibration sensors are mainly used as receiving elements. These receiving elements have the characteristics of low noise, high dynamic range and wide frequency response, and thus can accurately receive the hidden sound signals in the environment, such as micro-vibration signals and infrasound signals.

[0076] Optionally, the receiving element can be installed on a patrol robot or a mobile detector to realize complete detection of the equipment to be detected and expand the range of signal receiving.

[0077] Step S3, restoring the sound signal emitted by the device to be detected from the mixed signal, so as to obtain the component condition of the device to be detected through the sound signal.

[0078] In the embodiment of the present application, a preset decoding algorithm is used to extract and restore the sound signal emitted by the device to be detected from the received mixed signal, and the corresponding audio information is obtained for accurate judgment of the fault problem of the component of the device to be detected, so as to realize the covert reception and restoration of sound.

[0079] In the embodiment of the present application, a preset decoding algorithm is used to extract and restore the sound signal emitted by the device to be detected from the received mixed signal, and the corresponding audio information is obtained for accurate judgment of the fault problem of the component of the device to be detected, so as to realize the covert reception and restoration of sound.

[0080] The embodiment of the present application has the following beneficial effects:

[0081] The embodiment of the present application sets the signal receiving parameters to realize adaptive reception of the signal by monitoring the environmental noise and interference, and optimizes the signal receiving effect. Moreover, the high-sensitivity receiving device accurately captures the low-frequency signal in the environment, obtains the emitted micro-vibration signal and infrasound signal, and restores the clear audio information from the mixed signal, which provides accurate data support for subsequent detection of whether the component of the device fails, and improves the stability and reliability of signal reception.

[0082] Third embodiment

[0083] Further, in order to implement the sending and receiving system of the low-frequency sound signal corresponding to the above-mentioned method embodiment to realize the corresponding functions and technical effects, FIG. 3 provides a structural diagram of a sending and receiving system of a low-frequency sound signal. For the convenience of description, only the part related to the present embodiment is shown, and the sending and receiving system of the low-frequency sound signal provided by the embodiment of the present application comprises:

[0084] The sending device of the low-frequency sound signal comprises:

[0085] The signal conversion module 201 is configured to convert the sound signal emitted by the device to be detected into a micro-vibration signal according to a preset diaphragm.

[0086] In the embodiment of the present application, a low-frequency speaker with a diaphragm is used to convert the sound signals emitted by the device into micro-vibration signals. Specifically, the electrical signals (i.e. sound signals) emitted by the device during operation are converted into mechanical vibrations, which in turn generate micro-vibration sound waves. The frequency of these micro-vibration sound waves is extremely low, far below the range of human hearing, so the human ear cannot directly hear them, and they do not cause noise pollution during transmission. Since the range of human hearing is generally 20hz-20khz, the frequency of the micro-vibration sound waves is usually below 20hz, and they can propagate through solid and liquid media.

[0087] The diaphragm is made of special materials, typically high-elasticity, low-density materials with good vibration characteristics, such as certain high-molecular polymers or composite materials. These materials can produce efficient micro-vibration under the drive of electrical signals, resulting in micro-vibration signals. In the embodiment of the present application, the design of the diaphragm takes into account the elasticity, density, and vibration mode optimization of the material to ensure efficient generation and propagation of the micro-vibration signals.

[0088] Optionally, the embodiment of the present application uses piezoelectric effect or electromagnetic drive to convert sound signals into mechanical vibrations of the diaphragm. Under the piezoelectric effect, the diaphragm will deform under the action of the electric field, thereby generating vibrations; electromagnetic drive drives the diaphragm to vibrate by the force of the current in the magnetic field.

[0089] The signal modulation module 202 is used to superimpose a preset infrasound signal onto the micro-vibration signal to obtain a mixed signal.

[0090] In the embodiment of the present application, the obtained micro-vibration signal is modulated and enhanced based on the preset infrasound signal, and the infrasound signal is superimposed to enhance the penetration and propagation distance of the signal. After signal modulation, a mixed signal is obtained, which has better penetration and propagation distance than the original micro-vibration signal.

[0091] Because the micro-vibration signal is generally below 20hz, the infrasound signal selected in the embodiment of the present application is an infrasound signal below 20hz. The infrasound signal is generated by an ultrasonic transducer or a specific frequency oscillator. The ultrasonic transducer generates ultrasonic waves through high-frequency vibration, and these ultrasonic waves will produce nonlinear effects when propagating in the medium, thereby generating infrasound.

[0092] For example, in the embodiment of the present application, frequency modulation, phase modulation, or amplitude modulation is used to encode the audio information corresponding to the micro-vibration signal into the infrasound signal, ensuring that the audio information is not damaged and distorted during transmission, thereby achieving covert transmission of information.

[0093] The signal sending module 203 is configured to optimize and send the mixed signal according to the current environmental noise condition.

[0094] In the embodiments of the present application, a reasonable sound field distribution and signal amplification circuit are designed according to the current environmental noise condition, which is used to reduce signal attenuation and interference, enhance the intensity and penetration of the infrasound signal in the mixed signal, and improve the stability and reliability of the mixed signal. Finally, the optimized mixed signal is sent to the receiving device for device fault detection of the to-be-detected equipment.

[0095] The sending device is used to convert the electrical signal, i.e. the sound signal, emitted by the components of the to-be-detected equipment during operation into a low-frequency micro-vibration signal that is difficult for human ears to detect through a vibrating membrane made of special material, so as to avoid causing environmental noise pollution. Then, the micro-vibration signal is modulated by the optimized infrasound signal to enhance the penetration and propagation distance of the signal. Finally, the infrasound signal in the mixed signal is strengthened according to the current environmental noise condition, the intensity and penetration of the infrasound signal in the mixed signal are enhanced, and the stability and reliability of the mixed signal are improved.

[0096] The receiving device of the low-frequency sound signal comprises:

[0097] The parameter adjustment module 301 is configured to adjust the signal receiving parameter according to the current environmental noise condition.

[0098] In the embodiments of the present application, an environmental perception module is built in the receiving device, which can monitor and analyze the environmental noise and interference in real time, automatically adjust the signal receiving parameter to optimize the signal receiving effect, and accurately receive the signal by automatically adapting to the environmental change. Among them, the signal receiving frequency band and period are set by collecting environmental sound signals and performing frequency spectrum analysis, noise estimation and other processing, thereby providing adaptive adjustment data support for subsequent signal receiving.

[0099] The signal capturing module 302 is configured to capture the mixed signal in the preset detection range according to the signal receiving parameter.

[0100] In the embodiments of the present application, a high-sensitivity microphone or vibration sensor is mainly used as a receiving element, which has the characteristics of low noise, high dynamic range and wide frequency response, and thus can accurately receive hidden sound signals in the environment, such as micro-vibration signals and infrasound signals. Optionally, the receiving element can be installed on a patrol robot or a mobile detector to realize complete detection of the to-be-detected equipment and expand the range of signal receiving.

[0101] Through the high-sensitivity receiving device, the micro-vibration signal and the infrasound signal in the environment, i.e. the mixed signal, are captured and distinguished in the set receiving range.

[0102] The signal receiving module 303 is configured to restore the sound signal emitted by the device to be detected from the mixed signal, so as to obtain the component condition of the device to be detected through the sound signal.

[0103] In the embodiments of the present application, the preset decoding algorithm is used to extract and restore the sound signal emitted by the device to be detected from the received mixed signal, so as to obtain the corresponding audio information for accurately judging the fault problem of the component of the device to be detected, and to realize the covert receiving and restoration of the sound.

[0104] The receiving device is configured to monitor and analyze the environmental noise and interference, automatically adjust the signal receiving parameters to optimize the signal receiving effect, capture and distinguish the micro-vibration signal and the infrasound signal in the environment within the set receiving range, obtain the mixed signal containing the audio information of the device to be detected, extract and restore the sound signal emitted by the device to be detected from the mixed signal, obtain the corresponding audio information for accurately judging the fault problem of the component of the device to be detected, and realize the covert receiving and restoration of the sound.

[0105] The above embodiments further illustrate the purpose, technical solutions and advantages of the present application. It should be understood that the above embodiments are only specific embodiments of the present application and are not used to limit the protection scope of the present application. It is particularly pointed out that any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A transmission method of a low frequency sound signal, characterized by, The method comprises the following steps: According to the preset diaphragm, the sound signal emitted by the to-be-detected device is converted into a micro-vibration signal; The preset infrasound signal is superimposed into the micro-vibration signal to obtain a mixed signal; According to the current environmental noise, the mixed signal is optimized and sent.

2. The transmission method of a low frequency sound signal according to claim 1, characterized by, The method according to the preset diaphragm, the sound signal emitted by the to-be-detected device is converted into a micro-vibration signal, specifically: The sound signal is converted into the mechanical vibration of the diaphragm to obtain the micro-vibration signal; wherein the effect of the mechanical vibration can be optimized by adjusting the geometric shape and thickness of the diaphragm.

3. The transmission method of a low frequency sound signal according to claim 1, characterized by, The method of superimposing the preset infrasound signal into the micro-vibration signal to obtain a mixed signal, specifically: According to the preset signal modulation mode, the audio information corresponding to the micro-vibration signal is encoded into the infrasound signal to obtain a mixed signal.

4. The transmission method of a low frequency sound signal according to claim 1, characterized by, The method according to the current environmental noise, the mixed signal is optimized and sent, specifically: According to the current environmental noise, a signal enhancement strategy is constructed; The infrasound signal in the mixed signal is optimized through the signal enhancement strategy to obtain an optimized mixed signal and send it.

5. A transmission apparatus of a low frequency sound signal, characterized by comprising: The method comprises the following steps: Signal conversion module, signal modulation module and signal sending module; The signal conversion module is used to convert the sound signal emitted by the to-be-detected device into a micro-vibration signal according to the preset diaphragm; The signal modulation module is used to superimpose the preset infrasound signal into the micro-vibration signal to obtain a mixed signal; The signal sending module is used to optimize and send the mixed signal according to the current environmental noise.

6. A reception method of a low frequency sound signal, characterized by, The method comprises the following steps: According to the current environmental noise, adjust the signal receiving parameters; According to the signal receiving parameters, capture the mixed signal in the preset detection range; The sound signal emitted by the to-be-detected device is restored from the mixed signal, so that the component condition of the to-be-detected device can be obtained through the sound signal.

7. The reception method of a low frequency sound signal according to claim 6, characterized in that, The method according to the current environmental noise, adjust the signal receiving parameters, specifically: Real-time acquisition and processing of environmental sound signals to obtain the current environmental interference; According to the environmental interference, set the frequency band and period of signal reception.

8. The reception method of a low frequency sound signal according to claim 6, characterized by, The method of restoring the sound signal emitted by the to-be-detected device from the mixed signal, specifically: Decode and process the mixed signal to extract the sound signal emitted by the to-be-detected device; The sound signal is de-noised and de-interfered to obtain the audio information of the to-be-detected device.

9. A receiving device for low frequency sound signals, characterized in that The method comprises the following steps: Parameter adjustment module, signal capture module and signal receiving module; The parameter adjustment module is used to adjust the signal receiving parameters according to the current environmental noise; The signal capture module is used to capture the mixed signal in the preset detection range according to the signal receiving parameters; The signal receiving module is used to restore the sound signal emitted by the to-be-detected device from the mixed signal, so that the component condition of the to-be-detected device can be obtained through the sound signal.

10. A transmission, reception system of low frequency sound signals, characterized in that, The method comprises the following steps: Low-frequency sound signal sending device and receiving device; The sending device is used to execute the low-frequency sound signal sending method in any one of claims 1 to 4; The receiving device is configured to perform the low-frequency sound signal receiving method of any one of claims 6 to 8.

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