Through-wall seismic frequency conduction method and device and computer equipment

Abstract

The invention relates to a through-wall seismic frequency conduction method and device and computer equipment, and belongs to the technical field of signal transduction, the initial intensity information when a wifi optical signal is output and the end point intensity information when the wifi optical signal is received are obtained through the computer equipment, and the intensity attenuation value of the wifi optical signal after passing through one or more walls is obtained; when it is judged that the intensity attenuation value is higher than a preset signal threshold value, an adjusting signal is generated and sent to the exciter, a plurality of seismic frequency components limiting the exciter are reduced to one through the adjusting signal so as to adjust a specific seismic frequency component, and an excitation signal generated by the specific seismic frequency component is applied to the wall so as to adjust the intensity attenuation value of the wall. The technical problems of uncontrollable attenuation and poor adaptability in WiFi signal through-wall transmission are effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of signal conduction technology, and in particular to a method, device and computer equipment for conducting vibration frequencies through walls. Background Art

[0002] With the widespread adoption of wireless local area network (WiFi) technology, signal coverage issues in indoor environments with multiple walls are becoming increasingly prominent. When traditional WiFi signals are transmitted through walls, wall materials (such as concrete and masonry) selectively attenuate electromagnetic waves of different frequencies, resulting in reduced signal strength and transmission stability at the receiving end. Existing technologies typically address this issue by increasing transmit power or deploying relay equipment, but these technologies suffer from drawbacks such as high power consumption, increased equipment costs, and increased deployment complexity. Summary of the Invention

[0003] The main purpose of the present invention is to provide a method, device and computer equipment for transmitting vibration frequency through walls, which effectively solves the technical problems of uncontrollable attenuation and poor adaptability in the transmission of WiFi signals through walls.

[0004] To achieve the above-mentioned object, the present invention provides a method for transmitting vibration frequency through a wall, comprising the following steps: At the same time, an excitation signal containing multiple vibration frequency components is generated by an exciter disposed on one side of the wall and applied to the wall, wherein the excitation signal is generated based on pre-obtained density and elastic parameters of the wall material; At the same time, a Wi-Fi optical signal is transmitted through the optical fiber array deployed on the other side of the wall, and the Wi-Fi optical signal is transmitted through the wall and output to the computer device; Obtaining, by the computer device, initial intensity information of the WiFi optical signal when it is output and end intensity information when it is received, and obtaining an intensity attenuation value of the WiFi optical signal after it passes through one or more walls; When it is determined that the intensity attenuation value is higher than a predetermined signal threshold, an adaptation signal is generated and sent to the exciter. The adaptation signal is used to reduce the multiple vibration frequency components of the limited exciter to one, so as to adapt a specific vibration frequency component, and the excitation signal generated by the specific vibration frequency component is applied to the wall.

[0005] Furthermore, the step of generating an excitation signal containing multiple vibration frequency components and applying the excitation signal to the wall by an exciter provided on one side of the wall includes: The wall thickness is measured in advance using a laser thickness gauge, and the wall vibration response signal is collected by tapping / hammering to calculate the wall material density, elastic parameters and Poisson's ratio; Calculate the propagation speed and attenuation of mechanical waves in the wall at different frequencies according to the material mechanics formula to form a frequency-attenuation comparison table; The frequency range where the attenuation is lower than 40% of the input signal strength on the wall surface is selected from the comparison table, and 3-5 discrete frequency points are selected from the frequency range at intervals of 10 kHz as the vibration frequency components; Based on the frequency value of each of the vibration frequency components, the excitation signal is obtained and applied to the wall.

[0006] Furthermore, the step of calculating the propagation speed and attenuation of mechanical waves in the wall at different frequencies according to the material mechanics formula to form a frequency-attenuation comparison table includes: By obtaining the wall material density ρ, elastic parameter E and Poisson's ratio , substitute into the formula of longitudinal wave propagation velocity , calculate the basic propagation velocity v of mechanical waves in the wall medium; For discrete frequency points f within the preset frequency range, the attenuation coefficient calculation formula is used , calculate the mechanical wave attenuation coefficient corresponding to each frequency point ; According to the mechanical wave attenuation coefficient Calculate the signal attenuation per unit wall thickness , where d is the wall thickness, and the attenuation A of each frequency point f under the actual wall thickness is obtained; Each frequency point f is associated with the corresponding propagation velocity v and attenuation A to form a frequency-attenuation comparison table.

[0007] Furthermore, the step of obtaining, by the computer device, the initial intensity information of the WiFi optical signal when it is output and the terminal intensity information when it is received, and obtaining the intensity attenuation value of the WiFi optical signal after passing through one or more walls includes: By connecting the computer device to the optical fiber array, the initial strength value of the WiFi signal when it is transmitted can be directly read; at the same time, the end strength value of the WiFi signal received after being transmitted through the wall can also be obtained; By calculating the difference between the initial intensity value and the final intensity value, we can get the intensity attenuation value of the WiFi signal after it passes through the wall.

[0008] Furthermore, when it is determined that the intensity attenuation value is higher than a predetermined signal threshold, an adaptation signal is generated and sent to the exciter, and the adaptation signal is used to reduce multiple seismic frequency components of the exciter to one, thereby adapting a specific seismic frequency component, and applying the excitation signal generated by the specific seismic frequency component to the wall, including the following steps: Generate a frequency adaptation instruction and send it to the exciter, wherein the adaptation instruction controls the exciter to sequentially shut down the output of other seismic frequency components and retain only a single seismic frequency component for cyclic testing; In each test cycle, the intensity attenuation value of the WiFi signal corresponding to the currently retained frequency component after passing through the wall is collected, and the attenuation data of each frequency component is recorded; The vibration frequency component with the smallest attenuation value during the test period is selected as the specific vibration frequency component, and the exciter is controlled to output only the vibration signal corresponding to the specific vibration frequency component and apply it to the wall.

[0009] Furthermore, the testing process of selecting a specific seismic frequency component from a plurality of seismic frequency components includes: Generate test instructions to control the exciter to activate individual vibration frequency components in ascending order of frequency, and suspend the output of other components; After each vibration frequency component is activated, it continuously outputs 3-5 signal cycles, and the WiFi signal endpoint strength value within the corresponding cycle is synchronously collected by computer equipment; Calculate the average attenuation value for 3-5 cycles of data for each component, and record the frequency value and average attenuation value of the component; After completing the test of all vibration frequency components, compare the average attenuation values ​​of each component and select the component with the smallest attenuation value as the specific vibration frequency component.

[0010] Furthermore, the step of selecting the component with the smallest attenuation value as the specific vibration frequency component includes: If there are components with the same attenuation value, the component with the lower frequency is selected as the priority.

[0011] The present invention provides a through-wall vibration frequency transmission device, comprising: an excitation unit, configured to simultaneously generate an excitation signal containing multiple vibration frequency components and apply the excitation signal to the wall through an exciter disposed on one side of the wall, wherein the excitation signal is generated based on pre-obtained density and elastic parameters of the wall material; The optical fiber unit is used to transmit a Wi-Fi optical signal through the optical fiber array deployed on the other side of the wall at the same time, and output the Wi-Fi optical signal to the computer device after passing through the wall; A computer device acquisition unit is used to obtain initial intensity information of the WiFi optical signal when it is output and end intensity information when it is received through the computer device, and obtain the intensity attenuation value of the WiFi optical signal after passing through one or more walls; The computer equipment adaptation unit is used to generate an adaptation signal and send it to the exciter when it determines that the intensity attenuation value is higher than a predetermined signal threshold, and reduce the multiple vibration frequency components of the limited exciter to one through the adaptation signal to adapt a specific vibration frequency component, and use the excitation signal generated by the specific vibration frequency component to apply to the wall.

[0012] The present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned through-wall vibration frequency transmission method when executing the computer program.

[0013] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-mentioned through-wall vibration frequency transmission method.

[0014] The method, device, and computer equipment for transmitting vibration frequencies through walls provided by the present invention have the following beneficial effects: When traditional WiFi signals pass through walls, the walls have frequency selectivity in attenuating electromagnetic waves. However, this invention pre-acquires key parameters of the wall material, such as density and elastic parameters, and constructs a frequency-attenuation comparison table based on material mechanics formulas to accurately screen out vibration frequency components with an attenuation of less than 40% in the target wall. Compared to traditional fixed-frequency excitation or blind multi-frequency transmission, this method can generate "customized" excitation signals for specific wall dielectric properties, deeply matching the mechanical vibration energy with the wall's conduction characteristics. When the real-time monitoring detects that the signal attenuation value is higher than the threshold, the specific vibration frequency with the minimum attenuation is screened out through component-by-component testing, achieving low-loss conduction of the vibration signal within the wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a flow chart of a method for transmitting vibration frequency through a wall in accordance with an embodiment of the present invention; Figure 2 This is a structural block diagram of a through-wall vibration frequency transmission device according to one embodiment of the present invention; Figure 3 It is a schematic block diagram of the structure of a computer device according to an embodiment of the present invention.

[0016] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] Reference Figure 1 This is a flow chart of a through-wall vibration frequency transmission method proposed by the present invention, which includes the following steps: S11, at the same time, generating an excitation signal including multiple vibration frequency components through an exciter disposed on one side of the wall and applying the excitation signal to the wall, wherein the excitation signal is generated based on pre-obtained density and elastic parameters of the wall material; S12, at the same time, transmitting a Wi-Fi optical signal through the optical fiber array deployed on the other side of the wall, transmitting the Wi-Fi optical signal through the wall and outputting it to the computer device; S2, obtaining, by the computer device, initial intensity information of the WiFi optical signal when it is output and end intensity information when it is received, and obtaining an intensity attenuation value of the WiFi optical signal after it passes through one or more walls; S3, when it is determined that the intensity attenuation value is higher than a predetermined signal threshold, an adaptation signal is generated and sent to the exciter, and the adaptation signal is used to reduce the multiple vibration frequency components of the limited exciter to one, so as to adapt a specific vibration frequency component, and the excitation signal generated by the specific vibration frequency component is applied to the wall.

[0019] In one embodiment, the step of generating an excitation signal containing multiple vibration frequency components and applying the excitation signal to the wall by an exciter disposed on one side of the wall includes: The wall thickness is measured in advance using a laser thickness gauge, and the wall vibration response signal is collected by tapping / hammering to calculate the wall material density, elastic parameters and Poisson's ratio; Calculate the propagation speed and attenuation of mechanical waves in the wall at different frequencies according to the material mechanics formula to form a frequency-attenuation comparison table; The frequency range where the attenuation is lower than 40% of the input signal strength on the wall surface is selected from the comparison table, and 3-5 discrete frequency points are selected from the frequency range at intervals of 10 kHz as the vibration frequency components; Based on the frequency value of each of the vibration frequency components, the excitation signal is obtained and applied to the wall.

[0020] Specifically, the steps of calculating the propagation speed and attenuation of mechanical waves in the wall at different frequencies according to the material mechanics formula to form a frequency-attenuation comparison table include: By obtaining the wall material density ρ, elastic parameter E and Poisson's ratio , substitute into the formula of longitudinal wave propagation velocity , calculate the basic propagation velocity v of mechanical waves in the wall medium; For discrete frequency points f within the preset frequency range, the attenuation coefficient calculation formula is used , calculate the mechanical wave attenuation coefficient corresponding to each frequency point ; According to the mechanical wave attenuation coefficient Calculate the signal attenuation per unit wall thickness , where d is the wall thickness, and the attenuation A of each frequency point f under the actual wall thickness is obtained; Each frequency point f is associated with the corresponding propagation velocity v and attenuation A to form a frequency-attenuation comparison table.

[0021] In the specific implementation process, taking a common residential concrete wall (200mm thick) as an example, the complete process of generating the excitation signal and constructing the frequency-attenuation comparison table is explained: First, the target wall's thickness was measured at three points using a laser thickness gauge (model: ZTMS08). The average value, 200 mm, was taken as the wall thickness d. Simultaneously, a force hammer (equipped with a 50 kN impact sensor) was used to strike the wall at three different locations on the surface (avoiding wall joints). After each strike, a MEMS accelerometer (sensitivity 100 mV / g) placed near the strike point collected the vibration response signal. This signal was converted to a digital signal using a 24-bit analog-to-digital converter and input into a computer. The amplitude-frequency characteristics of the vibration signal were analyzed using a Fourier transform. Combined with the force-time curve of the force hammer, an inversion algorithm (such as the least-squares method) was used to calculate the wall material parameters: density ρ = 2300 kg / m³, elastic modulus E = 25 GPa, and Poisson's ratio μ = 0.2.

[0022] Based on the above parameters, substitute into the longitudinal wave propagation velocity formula , the basic propagation velocity of the mechanical wave in the wall is calculated to be v≈4000m / s. Then the preset frequency range is set to 50kHz-300kHz (covering the common wall resonance frequency range), and 26 discrete frequency points (50kHz, 60kHz...300kHz) are generated at intervals of 10kHz. Using the attenuation coefficient formula , calculate the mechanical wave attenuation coefficient corresponding to each frequency point (For example, when f=80kHz, α≈0.025 ¹), further according to the attenuation formula Calculate the attenuation under actual wall thickness (at f = 80 kHz, A ≈ 8.686 × 0.025 × 0.2 ≈ 0.43 dB); Arrange the f, v, and A data of each frequency point into a table, for example:

[0023] According to the comparison table, we screened for frequencies where the attenuation A was less than 40% of the input signal strength (i.e., A < 40% × initial signal strength. Assuming an initial strength of 100dBm, we selected a frequency range where A < 40dB). In this example, 11 frequency points within the 50kHz-150kHz range met the criteria. Furthermore, we selected three typical frequency points (50kHz, 80kHz, and 120kHz, corresponding to 80% of the wall's first-order natural frequency, the fundamental frequency, and 1.2 times the frequency, respectively) at 10kHz intervals as vibration frequency components. A multi-frequency signal generator generated a superimposed sine wave signal containing these three frequencies. After amplification by a power amplifier, this signal drove a piezoelectric ceramic transducer (model: P-841.10) to apply vibration excitation against the wall surface.

[0024] In one embodiment, the steps of transmitting a Wi-Fi optical signal through an optical fiber array deployed on the other side of a wall, transmitting the Wi-Fi optical signal through the wall and outputting it to a computer device are: The fiber array deployed on the other side of the wall consists of a linear array of eight single-mode optical fibers (spaced 5 cm apart). Each fiber is terminated with a miniature optical transmitter module (including a DFB laser and signal modulator). The WiFi baseband signal (2.4 GHz or 5 GHz band) at the transmitter is first encoded into a quadrature phase-shift keying (QPSK) signal by a digital signal processor. This signal is then transferred to a 1550 nm laser carrier via an electro-optical modulator, forming an optical signal carrying the WiFi data. The optical signals from each fiber channel are combined by a wavelength division multiplexer (WDM) and then emitted as parallel beams through a collimating lens at the end of the fiber array onto the wall surface.

[0025] The optical signal doesn't directly penetrate the wall. Instead, it propagates by generating forced vibrations on the wall surface. The optical signal emitted by the fiber array has a power density of 0.5-1W / cm². When the optical signal strikes the wall, the exciter generates a vibration signal at the same frequency as the wall (the frequency of the WiFi signal carrier). This vibration propagates through the wall as an elastic wave, effectively modulating the WiFi signal onto a mechanical vibration carrier for transmission through the wall.

[0026] The receiving computer uses a MEMS accelerometer array (sensitivity 50mV / g, frequency response 20Hz-500kHz) deployed on the same side of the wall to collect vibration signals from the other side. These signals are then amplified by a charge amplifier and converted into electrical signals. The signal processing unit first removes ambient noise using a bandpass filter (passband range 50kHz-300kHz, corresponding to the exciter's vibration frequency). It then uses coherent demodulation to extract the vibration components that coincide with the fiber array's transmission frequency, ultimately outputting a WiFi signal.

[0027] Taking a 2.4GHz WiFi signal as an example, the optical signal emitted by the fiber array passes through the wall and, through an exciter, inputs an excitation signal for reception into the wall, generating a 2.4GHz high-frequency vibration. This vibration is attenuated by approximately 15dB in a 150mm thick brick wall, significantly lower than the attenuation of traditional electromagnetic waves passing through walls (under the same conditions, the attenuation of WiFi electrical signals through walls is approximately 35dB). The coordinated operation of the fiber array and the exciter enables the transmission of the "WiFi optical signal-wall vibration signal-WiFi optical signal" signal. Leveraging the efficient transmission characteristics of mechanical waves in solid media, this technology overcomes the technical bottleneck of traditional electromagnetic wave attenuation through walls, providing a new path for high-speed wireless communication in complex wall environments.

[0028] In one embodiment, the step of obtaining, by the computer device, initial intensity information of the WiFi optical signal when it is output and end intensity information when it is received, and obtaining an intensity attenuation value of the WiFi optical signal after passing through one or more walls includes: By connecting the computer device to the optical fiber array, the initial strength value of the WiFi signal when it is transmitted can be directly read; at the same time, the end strength value of the WiFi signal received after being transmitted through the wall can also be obtained; By calculating the difference between the initial intensity value and the final intensity value, we can get the intensity attenuation value of the WiFi signal after it passes through the wall.

[0029] During the specific implementation process: The computer device establishes a communication connection with the optical transmitter module of the fiber array via Ethernet, and uses the MODBUS-TCP protocol to read the transmitter parameters in real time. The fiber array serves as the WiFi signal transmitter, and its optical transmitter module (integrated DFB laser, central wavelength 1550nm) performs electro-optical conversion on the WiFi baseband signal (2.4GHz frequency band, QPSK modulation) before transmission to generate an optical signal carrying data. At this time, the optical power meter (accuracy ±0.1dBm) built into the optical transmitter module monitors the intensity of the transmitted optical signal in real time. The data is transmitted to the module control chip via the SPI bus and uploaded to the computer device via the Ethernet interface. For example, when the WiFi signal transmission power is set to 10dBm, the optical power meter measures the transmitted light intensity as -3dBm (corresponding to an optical power of approximately 500μW), and the computer device directly reads this value as the initial intensity value. , to obtain the initial intensity value.

[0030] After being conducted through the wall, the WiFi signal propagates to the receiving end of the computer device, which is equipped with an array of MEMS accelerometers (8 channels, 100mV / g sensitivity, and a frequency response of 20Hz-500kHz). The signal processing software built into the computer device first performs a bandpass filter on the WiFi signal (passband 50kHz-300kHz, corresponding to the range of the exciter's vibration frequency component) to remove environmental noise (such as air conditioning vibration and low-frequency interference caused by people walking). It then uses a fast Fourier transform to extract the vibration component at the same frequency as the fiber array's transmission frequency (such as 2.4GHz). The voltage value is converted to an effective value of the vibration acceleration using a calibration coefficient (0.1V / g corresponds to a vibration acceleration of 1g). The end point intensity value after transmission through the wall is then calculated using a pre-calibrated "optical signal strength" mapping relationship. .

[0031] The computer device directly performs the difference calculation between the initial intensity value and the end intensity value through the built-in numerical calculation module. The formula is This attenuation value directly reflects the energy loss of the WiFi signal after it passes through the wall. If the measured attenuation value exceeds a preset threshold (e.g., 15dB), the subsequent frequency component adaptation process is triggered. If it is below the threshold, the current multi-frequency excitation mode is maintained to ensure stable signal transmission.

[0032] In one embodiment, when it is determined that the intensity attenuation value is higher than a predetermined signal threshold, an adaptation signal is generated and sent to the exciter, and the adaptation signal is used to reduce multiple seismic frequency components of the exciter to one, thereby adapting a specific seismic frequency component, and applying an excitation signal generated by the specific seismic frequency component to the wall, including the following steps: Generate a frequency adaptation instruction and send it to the exciter, wherein the adaptation instruction controls the exciter to sequentially shut down the output of other seismic frequency components and retain only a single seismic frequency component for cyclic testing; In each test cycle, the intensity attenuation value of the WiFi signal corresponding to the currently retained frequency component after passing through the wall is collected, and the attenuation data of each frequency component is recorded; The vibration frequency component with the smallest attenuation value during the test period is selected as the specific vibration frequency component, and the exciter is controlled to output only the vibration signal corresponding to the specific vibration frequency component and apply it to the wall.

[0033] During implementation, the computer sends a frequency adaptation command to the exciter, which changes its current multi-frequency output mode, activating each component individually for testing while temporarily suspending output of the remaining components. The exciter switches to each component in a preset order (e.g., from low to high frequency or high to low frequency), each entering an independent test cycle. During each test cycle, the exciter continuously outputs the currently retained single frequency signal and applies it to the wall. The computer simultaneously collects the endpoint strength of the WiFi signal corresponding to that component after it passes through the wall. Combined with the initial strength value read in real time by the transmitter, it calculates and records the actual attenuation of the current component.

[0034] After completing the cyclic testing of all vibration frequency components, the computer analyzes and compares the attenuation data of each component during the test cycle. It then selects the specific vibration frequency component with the best conduction efficiency for the current wall environment according to preset rules (such as selecting the component with the lowest attenuation value). If multiple components have the same attenuation value, the final selection is further determined based on frequency characteristics (such as prioritizing low-frequency components to reduce energy consumption or high-frequency components to increase transmission speed). After the screening is complete, the computer sends a control command to the exciter, causing it to output only the vibration signal corresponding to that specific vibration frequency component. By precisely matching the low-attenuation frequency of the wall medium, efficient coupling and transmission of vibration energy is achieved, thereby reducing the intensity attenuation of the WiFi signal during wall penetration and improving signal transmission quality.

[0035] In a further embodiment, the testing process of selecting a specific seismic frequency component from a plurality of seismic frequency components includes: Generate test instructions to control the exciter to activate individual vibration frequency components in ascending order of frequency, and suspend the output of other components; After each vibration frequency component is activated, it continuously outputs 3-5 signal cycles, and the WiFi signal endpoint strength value within the corresponding cycle is synchronously collected by computer equipment; Calculate the average attenuation value for 3-5 cycles of data for each component, and record the frequency value and average attenuation value of the component; After completing the test of all vibration frequency components, compare the average attenuation values ​​of each component and select the component with the smallest attenuation value as the specific vibration frequency component.

[0036] Specifically, the test process of selecting a specific seismic frequency component from multiple seismic frequency components follows a systematic step-by-step verification logic: first, the computer equipment generates standardized test instructions to control the exciter to enter the single-frequency activation mode. This mode requires the exciter to activate only one component at a time and suspend the output of all other components in the order of the seismic frequency components from low to high (such as 50kHz, 80kHz, and 120kHz, respectively), ensuring that the wall is only excited by a single frequency vibration during the test to avoid interference between multi-frequency signals.

[0037] Once a vibration frequency component is activated, the exciter continuously outputs three to five complete signal cycles at a stable power level (the cycle duration is determined by the signal frequency, e.g., 12.5 microseconds for an 80kHz signal). During this period, the computer, through real-time communication with the receiving sensor array, synchronously collects the endpoint intensity value of the WiFi signal after it passes through the wall during each signal cycle. Hardware-triggered synchronization technology is used in this acquisition process to ensure precise alignment of the signal output with the data acquisition timestamp, preventing asynchronous errors from affecting the attenuation value calculation.

[0038] For each frequency component's three to five cycles of data, the computer first denoises the endpoint intensity values ​​(e.g., removing outliers exceeding two standard deviations). It then calculates the average endpoint intensity and, combined with the initial intensity values ​​recorded in real time by the transmitter, uses a difference operation to determine the average attenuation value for that component. Simultaneously, the component's frequency values ​​are correlated with the corresponding average attenuation values, forming a structured test data set (e.g., storing frequency-attenuation mappings in tabular form).

[0039] After completing single-frequency testing of all vibration frequency components, the computer compares the average attenuation values ​​of each component in the test data set. Based on the principle of "minimizing attenuation," the specific vibration frequency component with the best transmission efficiency is selected. This means the component with the lowest average attenuation value is directly selected as the target frequency for the final output. This selection logic is based on the wall medium's selective attenuation characteristics for vibration signals of different frequencies. Driven by measured data, the selected frequency ensures the lowest energy loss in the current wall environment, thereby dynamically matching the vibration signal with the wall's transmission characteristics.

[0040] Specifically, the step of selecting the component with the smallest attenuation value as the specific vibration frequency component includes: If there are components with the same attenuation value, the component with the lower frequency is selected as the priority.

[0041] Reference Attachment Figure 2 , which is a device block diagram of a through-wall vibration frequency transmission device proposed by the present invention, comprising: an excitation unit, configured to simultaneously generate an excitation signal containing multiple vibration frequency components and apply the excitation signal to the wall through an exciter disposed on one side of the wall, wherein the excitation signal is generated based on pre-obtained density and elastic parameters of the wall material; The optical fiber unit is used to transmit a Wi-Fi optical signal through the optical fiber array deployed on the other side of the wall at the same time, and output the Wi-Fi optical signal to the computer device after passing through the wall; A computer device acquisition unit is used to obtain initial intensity information of the WiFi optical signal when it is output and end intensity information when it is received through the computer device, and obtain the intensity attenuation value of the WiFi optical signal after passing through one or more walls; The computer equipment adaptation unit is used to generate an adaptation signal and send it to the exciter when it determines that the intensity attenuation value is higher than a predetermined signal threshold, and reduce the multiple vibration frequency components of the limited exciter to one through the adaptation signal to adapt a specific vibration frequency component, and use the excitation signal generated by the specific vibration frequency component to apply to the wall.

[0042] Reference Figure 3 In an embodiment of the present invention, a computer device is also provided. The computer device may be a server, and its internal structure may be as follows: Figure 3 As shown. The computer device includes a processor, memory, display screen, input device, network interface and database connected via a system bus. The processor of the computer design is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store the corresponding data in this embodiment. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, the above method is implemented.

[0043] Those skilled in the art will understand that Figure 3 The structure shown in the figure is merely a block diagram of a portion of the structure related to the solution of the present invention and does not constitute a limitation on the computer device to which the solution of the present invention is applied.

[0044] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which implements the above-described method when executed by a processor. It is understood that the computer-readable storage medium in this embodiment can be a volatile readable storage medium or a non-volatile readable storage medium.

[0045] To summarize, the initial intensity information of the WiFi optical signal when it is output and the end intensity information when it is received are obtained through a computer device, and the intensity attenuation value of the WiFi optical signal after passing through one or more walls is obtained; when it is determined that the intensity attenuation value is higher than a predetermined signal threshold, an adaptation signal is generated and sent to the exciter, and the adaptation signal is used to reduce the multiple frequency components of the limited exciter to one, so as to adapt a specific frequency component, and use the excitation signal generated by the specific frequency component to apply to the wall, so as to effectively solve the technical problems of uncontrollable attenuation and poor adaptability in the transmission of WiFi signals through walls.

[0046] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware using a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the above-described method embodiments. Any reference to memory, storage, database, or other media provided herein and used in the embodiments may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double-speed SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct RAMbus dynamic RAM (DRDRAM), and RAMbus dynamic RAM.

[0047] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, apparatus, article, or method comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, apparatus, article, or method. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, apparatus, article, or method comprising the element.

[0048] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for transmitting vibration frequency through a wall, characterized in that: The following steps are involved: At the same time, an excitation signal containing multiple vibration frequency components is generated by an exciter disposed on one side of the wall and applied to the wall, wherein the excitation signal is generated based on pre-obtained density and elastic parameters of the wall material; At the same time, a Wi-Fi optical signal is transmitted through the optical fiber array deployed on the other side of the wall, and the Wi-Fi optical signal is transmitted through the wall and output to the computer device; Obtaining, by the computer device, initial intensity information of the WiFi optical signal when it is output and end intensity information when it is received, and obtaining an intensity attenuation value of the WiFi optical signal after it passes through one or more walls; When it is determined that the intensity attenuation value is higher than a predetermined signal threshold, an adaptation signal is generated and sent to the exciter. The adaptation signal is used to reduce the multiple vibration frequency components of the limited exciter to one, so as to adapt a specific vibration frequency component, and the excitation signal generated by the specific vibration frequency component is applied to the wall.

2. The through-wall vibration frequency transmission method according to claim 1, characterized in that: The step of generating an excitation signal containing multiple vibration frequency components and applying the excitation signal to the wall by an exciter arranged on one side of the wall comprises: The wall thickness is measured in advance using a laser thickness gauge, and the wall vibration response signal is collected by tapping / hammering to calculate the wall material density, elastic parameters and Poisson's ratio; Calculate the propagation speed and attenuation of mechanical waves in the wall at different frequencies according to the material mechanics formula to form a frequency-attenuation comparison table; The frequency range where the attenuation is lower than 40% of the input signal strength on the wall surface is screened out from the comparison table, and 3-5 discrete frequency points are selected from the range at intervals of 10 kHz as the vibration frequency components; Based on the frequency value of each of the vibration frequency components, the excitation signal is obtained and applied to the wall.

3. The through-wall vibration frequency transmission method according to claim 2, characterized in that: The steps of calculating the propagation speed and attenuation of mechanical waves in the wall at different frequencies according to the material mechanics formula to form a frequency-attenuation comparison table include: By obtaining the wall material density ρ, elastic parameter E and Poisson's ratio , substitute into the formula of longitudinal wave propagation velocity , calculate the basic propagation velocity v of mechanical waves in the wall medium; For discrete frequency points f within the preset frequency range, the attenuation coefficient calculation formula is used , calculate the mechanical wave attenuation coefficient corresponding to each frequency point ; According to the mechanical wave attenuation coefficient Calculate the signal attenuation per unit wall thickness , where d is the wall thickness, and the attenuation A of each frequency point f under the actual wall thickness is obtained; Each frequency point f is associated with the corresponding propagation velocity v and attenuation A to form a frequency-attenuation comparison table.

4. The through-wall vibration frequency transmission method according to claim 1, characterized in that: The step of obtaining, by the computer device, initial intensity information of the WiFi optical signal when it is output and terminal intensity information when it is received, and obtaining an intensity attenuation value of the WiFi optical signal after passing through one or more walls includes: By connecting the computer device to the optical fiber array, the initial strength value of the WiFi signal when it is transmitted can be directly read; at the same time, the end strength value of the WiFi signal received after being transmitted through the wall can also be obtained; By calculating the difference between the initial intensity value and the final intensity value, we can get the intensity attenuation value of the WiFi signal after it passes through the wall.

5. The through-wall vibration frequency transmission method according to claim 1, characterized in that: When it is determined that the intensity attenuation value is higher than a predetermined signal threshold, an adaptation signal is generated and sent to the exciter, multiple seismic frequency components of the exciter are reduced to one by the adaptation signal to adapt a specific seismic frequency component, and an excitation signal generated by the specific seismic frequency component is applied to the wall, including the following steps: Generate a frequency adaptation instruction and send it to the exciter, wherein the adaptation instruction controls the exciter to sequentially shut down the output of other seismic frequency components and retain only a single seismic frequency component for cyclic testing; In each test cycle, the intensity attenuation value of the WiFi signal corresponding to the currently retained frequency component after passing through the wall is collected, and the attenuation data of each frequency component is recorded; The vibration frequency component with the smallest attenuation value during the test period is selected as the specific vibration frequency component, and the exciter is controlled to output only the vibration signal corresponding to the specific vibration frequency component and apply it to the wall.

6. The through-wall vibration frequency transmission method according to claim 5, characterized in that: The testing process for selecting a specific vibration frequency component from multiple vibration frequency components includes: Generate test instructions to control the exciter to activate individual vibration frequency components in ascending order of frequency, and suspend the output of other components; After each vibration frequency component is activated, it continuously outputs 3-5 signal cycles, and the WiFi signal endpoint strength value within the corresponding cycle is synchronously collected by computer equipment; Calculate the average attenuation value for 3-5 cycles of data for each component, and record the frequency value and average attenuation value of the component; After completing the test of all vibration frequency components, compare the average attenuation values ​​of each component and select the component with the smallest attenuation value as the specific vibration frequency component.

7. The through-wall vibration frequency transmission method according to claim 6, characterized in that: The steps of selecting the component with the smallest attenuation value as the specific vibration frequency component include: If there are components with the same attenuation value, the component with the lower frequency is selected as the priority.

8. A through-wall vibration frequency transmission device, characterized in that: include: an excitation unit, configured to simultaneously generate an excitation signal containing multiple vibration frequency components and apply the excitation signal to the wall through an exciter disposed on one side of the wall, wherein the excitation signal is generated based on pre-obtained density and elastic parameters of the wall material; The optical fiber unit is used to transmit a Wi-Fi optical signal through an optical fiber array deployed on the other side of the wall at the same time, and output the Wi-Fi optical signal to the computer device after passing through the wall; A computer device acquisition unit is used to obtain initial intensity information of the WiFi optical signal when it is output and end intensity information when it is received through the computer device, and obtain the intensity attenuation value of the WiFi optical signal after passing through one or more walls; The computer equipment adaptation unit is used to generate an adaptation signal and send it to the exciter when it determines that the intensity attenuation value is higher than a predetermined signal threshold, and reduce the multiple vibration frequency components of the limited exciter to one through the adaptation signal to adapt a specific vibration frequency component, and use the excitation signal generated by the specific vibration frequency component to apply to the wall.

9. A computer device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the processor executes the computer program, the steps of the through-wall vibration frequency transmission method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the through-wall frequency transmission method according to any one of claims 1 to 7 are implemented.

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